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REVELANDO A TAK-TENNA (BROWN DIPOLO)PARA 40 E 80 METROS terça-feira, 20 outubro 2009 8:50 PM Ψ

UM CONCEITO CRIADO POR ALAN R. BROWN EM 1969.(ALGUNS ARGUMENTAM QUE SERIA UMA VERSÃO DE UMA ANTENA PESQUISADA PELO INCRÍVEL NICOLAS TESLA) ESQUECIDA E REVITALIZADA AGORA PELOS RADIOAMADORES AMERICANOS E EUROPEUS. TAMBÉM CHAMADA DE BROWN DIPOLO.


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DETALHES: BOOM COM COMPRIMENTO de 76 CENTÍMETROS FEITO DE PVC DE 1 POLEGADA ou 3/4 veja abaixo. 4 PEDAÇOS DE CANO DE PVC DE MEIA COM 66 CENTÍMETROS DE COMPRIMENTOS PARA A CRUZETA. (USE PVC BRANCO) 33 CENTÍMETROS PARA CADA LADO(PARA 80 METROS PODE SER USADO 76 A 78 CENTÍMETROS) O INICIO DO ENROLAMENTO A 8 CENTÍMETROS DO CENTRO ESPAÇAMENTO ENTRE ESPIRAS 2.5 CENTÍMETROS TAMBEM ACONSELHA-SE FAZER O BOOM AJUSTÁVEL, OU SEJA USANDO COMO BOOM UM PVC DE 3/4 E SECÇÕES DE 1 POLEGADA PARA AJUSTE(VIDE FOTO) O TAMANHO DO BOM SERIA VARIADO EXPERIMENTALMENTE DE DE 68 A 97 CENTÍMETROS JUNTAMENTE COM A TOMADA FEITA NAS ESPIRAS VIA GARRAS JACARÉ.


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PARA A ESPIRAL FIO DE COBRE RÍGIDO 14 OU 12,NO ENTANTO PARECE EXISTIR INDICAÇÃO DE QUANTO MAIS GROSSO O FIO MELHOR A BANDA passante. FIO DESENCAPADO, PODE SER USADO FIO DE ALUMÍNIO OU AÇO


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O COAXIAL DE DESCIDA DEVE SER COLOCADO NO CENTRO DO BOOM E LIGADO ÀS ESPIRAS POR MEIO DE FIOS DE COBRE RÍGIDO MESMO DIÂMETRO DO USADO NAS ESPIRAIS.

ENCAPADO


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O AJUSTE DA ESTACIONÁRIA É FEITO VARIANDO SIMULTANEAMENTE POR MEIO DE GARRA JACARÉ A LIGAÇÃO DO CABO A PARTIR DO INICIO DAS ESPIRAS ( COMEÇO DO ENROLAMENTO)ATÉ ENCONTRAR O MELHOR PONTO, QUANDO ENTÃO SERÁ FEITA A FIXAÇÃO POR SOLDA. O AJUSTE DA ROE DEVE SER FEITO NA FREQUENCIA PARA QUAL A ANTENA FOI CALCULADA .É UM AJUSTE CRÍTICO E DEVE SER FEITO MILÍMETRO A MILÍMETROS E COM MUITA PACIÊNCIA. O PONTO DA MELHOR ROE PODERÁ VARIAR BASTANTE DE UMA ESPIRAL PARA OUTRA. PACIÊNCIA! AO MESMO TEMPO AUMENTE OU DIMINUA O TAMANHO DO BOOM. PODE SER NECESSÁRIO AJUSTAR O TAMANHO DAS ESPIRAIS, CORTANDO OU AUMENTANDO O TAMANHO DO FIO, MAS SÓ COMO ÚLTIMA INSTÂNCIA.


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A ANTENA PARA AJUSTE DEVE FICAR NO MÍNIMO A 2 METROS E MEIO DO SOLO. RECOMENDA-SE QUE SEJA INSTALADA A PARTIR DE 7 METROS DE ALTURA E ALGUNS UTILIZAM-NA VERTICAL. EXPERIMENTE. ALGUNS AUTORES RECOMENDAM UM BALUN 1:1 , O QUE ACHAMOS IMPORTANTE. PARA MASTRO USE UM CANO DE PVC DE 1 METRO E MEIO, INSERINDO O MESMO NO MASTRO METÁLICO.

O COMPRIMENTO DAS DUAS ESPIRAIS SEGUE A FÓRMULA 139.5/f EM Mhz + 3 POR CENTO APÓS DIVIDA POR 2 PARA OBTER O COMPRIMENTO PARA CADA LADO DA ANTENA PARA O CABO COAXIAL USE A FÓRMULA 99/f EM Mhz(A MESMA FREQUÊNCIA UTILIZADA NO CÁLCULO ANTERIOR) USANDO, SE NECESSÁRIO, MÚLTIPLOS INTEIROS DO VALOR OBTIDO. CABO DE 50 OHMS. EXISTEM EXPERIÊNCIAS DESTA ANTENA PARA 80, 40, 20 E 15 , 12, 10 E 11 METROS. EMBORA AO QUE PAREÇA O MELHOR DESEMPENHO SEJA EM 80 E 40 METROS E 20M. O PROBLEMA TAMANHO DE ANTENA JÁ NÃO É TÃO CRÍTICO A PARTIR DE 12 METROS,PELA FACILIDADE DE SE USAR ANTENAS VERTICAIS. OBSERVE AS FOTOS QUE PRATICAMENTE INDICAM O MEIO DE FAZER.


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COMEÇE O ENROLAMENTO DE DENTRO PRA FORA, EMBORA ALGUNS AUTORES RECOMENDEM COMEÇAR DE FORA PARA DENTRO, FAÇA A SUA OPÇÃO. OBSERVE QUE UMA DAS ESPIRAIS COMEÇA A SER ENROLADA DA DIREITA PRA ESQUERDA E A OUTRA DA ESQUERDA PARA A DIREITA. NORMALMENTE COM AS MEDIDAS DADAS A ANTENA DE 80 METROS TEM 16 ESPIRAS E A DE 40 METROS 12 ESPIRAS, EMBORA PARA A FREQUENCIA PARA ONDE FOI PLANEJADA A ANTENA NÃO PRECISE, PODE SER USADO ACOPLADOR ;ASSIM A MESMA PODE SER


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EXPERIMENTADA EM OUTRAS BANDAS.

É UMA ANTENA DE BANDA PASSANTE ESTREITA COM A ROE VARIANDO DE 1:1 ATÉ 1:5 EM UMA FAIXA DE 150 KILOHERTZ OU 200. NÃO TEM O MESMO GANHO DAS ANTENAS CONVENCIONAIS, MAS TEM SE MOSTRADO, NAS EXPERIÊNCIAS FEITAS LÁ FORA, UMA ANTENA EXCELENTE PARA QUEM NÃO TEM ESPAÇO, ALÉM DE SER MUITO INTERESSANTE POR SUA PORTABILIDADE E BAIXO CUSTO . JA COMEÇAM A SER FEITOS TESTES PARA UMA VERSÃO PARA 160 METROS. O "TAMANHO" DA ESPIRAL PODE SER CALCULADO PELA FÓRMULA: 2*3.14*r ~ PROCURE O MELHOR AJUSTE PARA QUE A ESPIRAL SEJA FEITA DA FORMA MAIS PERFEITA POSSÍVEL. É UMA ANTENA, PARA NÓS, NOVA E INUSITADA E ABERTA AS EXPERIÊNCIAS DE CADA UM TAÍ A TAK-TENNA OU BROWN DIPOLO...QUE PODERÍAMOS CHAMAR DE ANTENA ESPIRAL........ QUEM VAI SE HABILITAR??????? IREI COMEÇAR A MINHA EM BREVE. ENVIE RELATOS DE SUAS EXPERIÊNCIAS Ψ tomahawk pdf

FONTES: VA3QV EA5GU Paco Hernandez 9W2WTF DON BUTLER Bill - KA6KBC http://www.qsl.net/wa2lqo/nlaug03.html http://wbilljohnson.com/zmvantenna/zmvantenna.htm#intro Bill Petlowany, K6NO


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Steve – WA2TAK http://www.tak-tenna.com/ http://bvarc.freeshell.org/newsletter/BVARC_December_2007.pdf KL7JR GIL LAPPAY KF2KWT EA5AMM YI1FLY

COLABORAÇÃO DEΨ DINEY TARUGO SCAFURA WILLEMENΨ PU1PBY PX1K6886 SWLPY10130 RADIO ATIVISTA OPERADOR GERAL GMDSS RADIO TELEFONISTA GERAL

http://ferrodesoldar.nireblog.com http://radiotelefonista.nireblog.com http://dineymonteiro.nireblog.com

FORTE 73!


Project Overview - Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna...

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Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna or Tak Antenna from KA6KBC

Overview

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RF Band pass Filters Ceramic,Diplexers,Duplexers,Cavity Crystal,LC,Lowpass,Highpass,SAW 4

5

Project Overview

www.www.anatechelectronics.com

Homebrew: Tak-tenna or Tak Antenna SEE a MUCH better Write up: http://billbrwn.tripod.com//id3.html So I've been reading about this Small Space antenna that is being sold as the TAK-Tenna. Really neat idea - Has a 30" boom and Sprial Coils on the ends. See a picture at http://www.taktenna.com/ Looks easy to built - Right ! So I Built my version out of wood - Mine is very ugly as compared to the store bought one. Well it does load up with a respectible SWR 1:1 to 1:5 from 7.300 to 7.175 MHZ (No Transmatch). My dipole does better, but the antenna works and is really small.

Materials and Tools

KG-UVD1P Dual Band Radio Wouxun Dual Band handheld radio 136-174 and 400-470 Mhz www.radiogearpro.com

UHF Panel Antennas UHF Directional Panel Antennas 8 dB gain. Get Info! www.dbSpectra.com

Parts: 3 - Wooden sections - 1 1/2" X 1/2 " X 8' - Cost 92 Cent each - Home Depot 1 - Spool of Steel Guide/fence Wire - Cost - $7 - Home Depot 1 - 25 foot RG8 coax with PL259 - Radio Shack - Close Out - $5 2 Packages - Nuts/Bolts - $2 - Home Depot 2 - Aligator Chips - Junk Box. Total Material Cost: $16.76 The commerical version uses PVC, which would have been much easyier. Tools: Need just basic hand Tools - Hand Saw, Drill, and Wire Cutters.

Go to: Overview 1 2 3 4 5 Next Step >>

TOC Radio Remoting Install antennas without coax Move antennas 10-km from CP www.SyntonicsCorp.com

Comfy Clamps from Webb Africa's top selling RF cable clamp Now available in Europe www.multiband.eu

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20/9/2009 00:48


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Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna or Tak Antenna from KA6KBC

Overview

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2

3

Step 1 See a picture of the

commerical version of the Antenna (http://www.tak-tenna.com/) - Mine is all wood and does not look that clean. However - Test wise it isn't bad I got it tuned up on 40 meters at about 8 feet off the ground and it has an SWR 1:2 to 1:5 from 7.30 to 7.175 MHZ (No Transmatch). Bad news the performance is not Great Signal pick up is several S units below my Dipole, but it does work. From what I have read the Antenna has problems in that most of the performance is based on feedline radiation. http://lists.contesting.com/archives//html/Towertalk/2008-04/msg00339.html

4

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Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna or Tak Antenna from KA6KBC

Overview

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5

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3

Step 2

My dipole does better (by several S Units), but the antenna works and is really small. Again - However - Upon doing some research you will find that many say that most of the radiated power is coming from the feedline.

http://lists.contesting.com/archives//html/Towertalk/2008-04/msg00339.html

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Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna or Tak Antenna from KA6KBC

Overview

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3

Step 3 For Tuning - Use

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5

Aligator Clips connect to the Coax and clip to Coils. I would suggest - Working out from the smallest part of the Coil then out in Even steps. I was able to get mine matched - In about 3 Trips.

TDK Horn Antenna 1-18GHz Wide band, double-ridged horn High gain, low VSWR, robust design www.tdkrfsolutions.com

Mobile Com. Equipment Wired and wireless integration System Development & Distribution www.Soluwins.biz

UHF Panel Antennas UHF Directional Panel Antennas 8 dB gain. Get Info! www.dbSpectra.com

RF/Microwave online RF & Microwave filters, amplifiers couplers,terminations,antennas www.www.amcrf.com

KG-UVD1P Dual Band Radio Wouxun Dual Band handheld radio 136-174 and 400-470 Mhz www.radiogearpro.com

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Bill's- Pan Cake - 40 Meter TAK-tenna or tak tenna or Tak Antenna from KA6KBC

Overview

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Step 4 One more added item -

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Someone had a question about my dimensions: Boom = 30 inches meaning Cross Pieces are about 30 inches a part. Cross Pieces = 24 Inches Across or 12 Inches from center Hole Spacing from Center, but this did not

seem critical: 12 in 11 in 10 in 9 in 8 in 7 in 6 in 5 in 4 in 3 in Total Turns = 10 If you make your own one point - I needed more wire than the 468/7.2 MHZ = 65 Feet Total or 32.5 Feet per side - I had to add wire after the fact. So I would make it about 33.5 per side. The spacing did not seem critical, but Read my related Links Section. 73's Bill - KA6KBC

Antennas for Orbcomm Low Profile, Small Footprint Combination antennas for Orbcomm www.multiband-antennas.com

TDK Horn Antenna 1-18GHz Wide band, double-ridged horn High gain, low VSWR, robust design www.tdkrfsolutions.com

UHF Panel Antennas UHF Directional Panel Antennas 8 dB gain. Get Info! www.dbSpectra.com

Mobile Com. Equipment Wired and wireless integration System Development & Distribution www.Soluwins.biz

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Burda ShortWave Heaters Effective, targeted and instant IR Heating. Get more info here! www.Burdawtg.com/ShortWave_Heat

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Spooky Tesla Spirit Radio by mrfixits on July 16, 2009

Table of Contents intro: Spooky Tesla Spirit Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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step 1: Parts List And Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

step 2: Make a Clear Cover and Drill It . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

step 3: Mount the Components on the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

step 4: Prepare the Induction Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

step 5: Wiring and Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

step 6: Make the Tesla Spiral Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

step 7: Make a Peculiar Tesla Football Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 step 8: Testing the AM Radio Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 step 9: Spooky Effect # 1 - Disembodied Spirit Voices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 step 10: Spooky Effect # 2 - Detect Lightning and Predict Storms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 step 11: Spooky Effect # 3 - Make Lights Sound Weird . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 step 12: Spooky Effect # 4 - Make Freaky Music . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 step 13: Spooky Effect #5 - Van Eck Phreaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 step 14: Spooky Effect #6 - Make Fright With A Mike . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 step 15: Spooky Effect # 7 - There's A Woodpecker In Your Modem! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Advertisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


intro: Spooky Tesla Spirit Radio "My first observations positively terrified me as there was present in them something mysterious, not to say supernatural, and I was alone in my laboratory at night" - Nikola Tesla 1901 Nikola Tesla has been recognized as the inventor of the radio since 1943. This Spooky Tesla Spirit Radio is a tribute to that little-known fact. The simple crystal radio circuit in it makes spooky sounds by responding to input from several sources. It is non-powered, so no batteries are required! This radio's basic L-C (Inductor-Capacitor) circuit would be similar to what Tesla would have experimented in his early days. The germanium diode substitutes for the nickel detectors and sensitive relays used by Tesla. Although it can receive AM broadcasts, this radio was made to have fun with in other ways. AM radio wasn't exactly what Nikola Tesla was interested in...in fact, he believed it was a waste of energy to transmit and receive Hertzian waves! "You must not make the antenna give off 90 percent in electromagnetic and 10 percent in current waves, because the electromagnetic waves are lost by the time you are a few arcs around the planet, while the current travels to the uttermost distance of the globe and can be recovered." ...Nikola Tesla The Spooky Tesla Spirit Radio is housed in a jam jar with a see-through polycarbonate lid. It connects to the computer sound-in jack with a patch cord. By using a program like Audio Hyjack Pro (Mac), the output can be tweaked to give some great real-time sound effects...and record them at the same time! In the accompanying movie, I show how the Spooky Tesla Spirit Radio reacts to many frequencies of light, sound, vibration, radio frequencies, RF pulses, magnetic fields and more. For best AM radio reception, it can be hooked up to a longer antenna and a ground connection for greater sensitivity and better sound. The plug-in antennas I made, are similar in shape to what Tesla designed for his energy transmission and receiving systems as in patent # 723188. Another optional antenna I experimented with, is the mysterious football-shaped coil that Tesla incorporated into later high voltage experiments.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 1: Parts List And Schematic Diagram List of Materials 1- Small Jam Jar, (Mason Jar) with large mouth 1- 3 1/4 inch dia Plexiglas (or polycarbonate) cover lid 1- C1 - 60/160 pf Variable Capacitor 1- Extension Shaft and Knob for above 1- L1 - Ferrite Loopstick Antenna (I1) 1- D1 - Germanium 1N34A Diode (*Allied Stock#: 935-0301) $2.16 ea 1- C2 - .001uf Capacitor (marked 102) (*Allied Stock#: 507-0822) $.21 ea 1- R1 - 47k Resistor (*Allied Stock#: 296-6641) $.05 ea 1- Chassis Banana Jack Red - (*Allied Stock#: 528-0158) $.53 ea 1- Chassis Banana Jack Black - (*Allied Stock#: 528-0159) $.53 ea 2 - (or more for each antenna) Banana Plug (*Allied Stock#: 528-0302) $1.21 2 -3.5 mm Mono Chassis Jack (*Allied Stock#: 932-0260) $1.16 a few inches of 20 gauge hook-up wire solder 1- Audio Patch Cord, 1/8 inch plug ends Optional - A second audio cord for a Hand Grip and Aux In Note: For Each Spiral Pancake Antenna, 6 feet of #14 gauge solid copper wire Banana Plug Note: For the Football Style Antenna, 4 feet #10 gauge solid copper wire. 40 feet of #30 gauge coated magnet wire. Heavy Paper Scotch Tape Hot Glue SuperGlue Banana Plug Tools Needlenose pliers Wire Cutter Soldering iron Computer w/ Audio Hijack audio software (Mac), or equivalent Crystal radio parts and kits available at http://comtrolauto.com/

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 2: Make a Clear Cover and Drill It The first step is to create a clear lid so we can see the simple but effective radio components. I chose polycarbonate just because that is what I had on hand. I used a circle cutting attachment on a drill press to cut out a 3.25 inch disc out of 3/16 inch Lexan polycarbonate. Next, 1/4 inch holes are drilled in the clear cover lid for the two banana jacks and for the two audio jacks. The two banana jacks will receive banana plugs with pre-mounted antennas. Two audio jacks will also be used. One is for for audio out to the computer, and one is for auxiliary input modulation from a hand gripper or other source. Drill holes as seen in the photos, or lay out your own hole design. I drilled a total of nine holes; Two 1/4 inch holes for antenna banana jacks, Two 1/4 inch holes for audio jacks, One hole for the variable capacitor shaft, and two small 1/16th inch holes for its screws and two 1/16th inch holes to feed the diode wires to mount the diode on top of the jar lid (This is for better light-to-sound effects; as the 1N34A diode is light-sensitive)

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 3: Mount the Components on the Cover Mount the Adjustable Capacitor and Banana Jacks in the clear jam jar cover. For the variable capacitor, I had to find two screws long enough to feed through the 3/16 inch thick cover. A thinner cover will work with standard screws. The variable cap has an optional shaft extension and knob kit found at http://comtrolauto.com/ Mount the 1/8 phono jacks as well. I had to countersink the holes to get the threads to start because of the rather thick plastic cover I used.

Image Notes 1. Countersunk hole and tiny wee screws. 2. 60/160 pf Variable capacitor 3. Ground terminal 4. 160 pf terminal of capacitor 5. Not-used terminal. (can be bridged with 160 pf terminal to give 220 pf) 6. Banana Jack for Antenna Mount 7. 1/4 inch hole for 2nd Banana Jack.

Image Notes 1. Common ground connection. 2. Diode connection to outside of jar lid through tiny holes. This puts the 1N34A diode outside the jar. 3. 1/8 inch plug Audio Patch Cord goes to "Audio In" jack on computer. 4. Auxillary signal input jack 5. Banana Jack with antenna plugged in with its banana plug attached. 6. Banana Jack and antenna plugged in. 7. .002 pf capacitor 8. 47k ohm resistor 9. Diode is about there somewhere! 10. 1/8 audio jack 11. variable capacitor 12. Inductor Coil for AM radio freq. (note negative end has black paint on the cotton wire cover.) available from http://comtrolauto.com/ 13. Flat Spiral Antenna similar to Tesla design.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 4: Prepare the Induction Coil There is an option with the Induction coil to run it direct with an antenna connection, or to wrap the Induction Coil with about 10 wraps of 22 gauge wire that runs from the antenna to ground. The first method gives a better chance of a station signal being loud enough with a short antenna. The second wrapped inductor method is best for using a long (20 foot plus) antenna. See schematic for clarification. I like the inductive method even with a short antenna, because it gives a clearer signal with less 60 cycle hum. The amplitude of sound will be less in AM tuning unless a long antenna is used however. The amplitude can be partially made up by using the human body as an antenna by touching the jam jar ring, which has a connecting wire that goes to the antenna + wire when the lid is twisted on. The other advantage of wrapping the inductor is that it gets supported inside the jar by the heavier wires.

Image Notes 1. 10 wraps of 22 ga copper magnet wire. Be sure ends are scraped or sanded to remove coating before soldering. (note pre-tinned wire tips) 2. ferrite core 3. 75 turn coil of very fine wire. 4. Tiny wee wires.

step 5: Wiring and Soldering Ok, once most components are in place, it's time to wire and solder things up. Direct point-to-point wiring can be used with so few components. Follow the pictures and the schematic for the basic connections. Only a couple of wires need to be soldered in. Run one ground wire from the middle ground post of C1 to the ground connection on the phone jack. Another wire will go from the antenna to the other C1 post. Note that the centre connection of the C1 variable capacitor is connected to the ground connection of the phone jack. The 160 pf connection is on the right facing C1 from the top looking down, connecting tabs facing away from you. The 60 pf connection is on the other side of the middle ground connection, and was not used. The D1 diode is heat sensitive and may fail if over-soldered. Use an alligator clip as a heat sink when soldering its leads. I mounted it on top of the cover to make it more sensitive to light. The L1 Induction Coil thin wire with black paint goes to ground. The other thin inductor wire goes to the non-ground C1 capacitor connection. L2 is simply 10 wraps of wire around the inductor coil.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 6: Make the Tesla Spiral Antennas "The Tesla antenna is a form of wireless antenna or wave launching structure developed by Nikola Tesla in which the transmitted energy propagates or is carried to the receiver by a combination of electrical current flowing through the earth, electrostatic induction and electrical conduction through plasma with an embedded magnetic field." - Gary L Peterson in "Rediscovering The Zenneck Surface Wave" This is an area for scientific and artistic license. There is still much debate as to what exactly Tesla was up to with his transmission and reception of power systems. ( See Joel Young's blog comments in Design News Magazine on July 8th, 16th and 28th... http://www.designnews.com/blog/The_Weird_and_Wonderful_World_of_Wireless/index.php?text=tesla+antenna+ I experimented with two types of Tesla antenna design. The first is similar to the flat spiral "Pancake" coil that is seen in several of Tesla's patents. The second is a peculiar "Football" coil made of two cones. For the basic spiral antenna, I used a 6 foot length of 14 gauge solid copper wire, and bent the wires by hand, coil by coil. I used a needle nose pliers to begin the core spiral, and after a turn or two, gently but firmly worked the wire around with bare hands. I soldered on a short vertical antenna to the centre loop. In retrospect, It would have been better to make the vertical end part with a one piece construction. Keep working the wire to eliminate kinks and bends, then make sure the coils are evenly spaced. I soldered on the vertical antenna last.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 7: Make a Peculiar Tesla Football Antenna This coil was one of Tesla's later designs, and is said to have spooky anti-gravity effects when pumped with the correct frequencies and voltages. I won't be working in that high-power range with this un-powered crystal radio ! The core of the Tesla Football Antenna is made with four 2 inch paper cones glued and taped together. The paper cones were doubled up, two on each side, for strength and smoothness. The 30 gauge wire conical coils are wound laboriously by hand. The thick 10 gage copper wire was carefully bent to conform to the football coil without disturbing the coils of the coil. (Note to self...don't try this again without coating the wires with a resin or glue first, because the coils will start unravelling...) After this small coil-winding feat, two snazzy Banana Plug ends are put on. These ones were found at an electronics store. Here's a link to a similar coil that puts out sparks! [http://www.tesla-coil-builder.com/double_cone_bipolar_tesla_coil.htm]

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 8: Testing the AM Radio Circuit This step is a circuit test of the Tesla Spirit Radio, to see if it works as an ordinary AM radio. Once the wiring and solder connections are double checked, we can test the AM radio part of the device. Plug in the Audio Patch Cord into the 1/8 inch jack of the radio, and then into the computer "Sound In" port. Launch Audio Hijack (or equivalent PC software). Set up with a basic 10-Band EQ and two or three AU Pitch controls. AU Bandpass and Reverb won't be used for this test...use their "Bypass" buttons. Gain may need to be turned up high. Au Pitch controls at the neutral 0 pitch setting. (See screenshot below.) Turn the variable capacitor knob and the sounds of a local AM station should come through; if not, a long antenna may be required in your area. Try touching the jar ring or antenna to see if that makes a difference. If you have no sound at all, then something is likely wrong. Check for a dry solder connection. Also, if too much soldering heat was used close to or on the diode connection, the diode may be burned out. Substitute to check, or use the diode checker function of your multi-meter to test it if necessary.

step 9: Spooky Effect # 1 - Disembodied Spirit Voices ""The sounds I am listening to every night at first appear to be human voices conversing back and forth in a language I cannot understand. I find it difficult to imagine that I am actually hearing real voices from people not of this planet. There must be a more simple explanation that has so far eluded me." -Nikola Tesla 1918 Nikola Tesla, and many others of the early radio pioneers, often thought they heard voices in their radio receptions. Both Edison and Tesla claimed to be working towards communicating with disembodied spirits. Dale Afrey, in the book "The Lost Journals Of Nikola Tesla", says . "At one point Tesla chided Edison for stealing his idea on using a form of radio to contact the dead." You can get the impression of disembodied spirit voices by tuning close to an AM station, then use the Au Pitch Controls to raise the pitch to a squeaky high, ghostly sound. Add Reverb for the final touch. Au Bandpass is also used in this effect. Check the settings in the screenshot below. Alternately, the AU Pitch can be used to lower the pitch instead of raising it, for a moaning type effect.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 10: Spooky Effect # 2 - Detect Lightning and Predict Storms "No doubt whatever remained: I was observing stationary waves." Nikola Tesla, commenting on reception of lightning in his receivers. The Spooky Tesla Spirit Radio can detect lightning! You can listen to AM radio if you really need to, but Nikola Tesla spent most of his radio listening time tuning into natural Earth (and beyond Earth) pulses, and the high and low frequency vibrations that were around him. He was a storm-chaser from the comfort of his own laboratory. During Tesla's Colorado Springs experiments, he would listen in on approaching and receding lightning storms, which he could detect up to hundreds of miles away. He noticed standing waves produced by the lightning that inspired him to develop his wireless power apparatus. It helps to have a long antenna (be sure it is safely grounded with a spark-gap arrester!), but even with the short antenna, this crystal radio can be made very sensitive with the computer software adjustments. When a storm is near, you can really hear it! (It's a loud crashing sound in the audio ;) Requirements: Mac computer and Audio Hijack software. "Super-Sensitive Lightning" software setting adjustment, as seen in the screenshot below...and a nearby storm! PC owners will need to use an audio software solution that is able to alter pitch, gain and reverb in real time. And preferably record it. Here's a fun site devoted to "Nature Radio Signals and strange emissions at very low frequency." http://www.vlf.it/

Image Notes 1. Au Pitch Controls... Approximate the settings shown. 2. Au Bandwidth Control. Approximate the settings. 3. Reverb Control. Approximate the settings or adjust to suit. 4. Note positions of knobs. 5. Maxed out gain. Turn back if excess feedback. 6. Audio Hijack audio software for the Mac. (sorry no PC version) Mac users can download a free trial version.

step 11: Spooky Effect # 3 - Make Lights Sound Weird The 1N34A germanium diode in this crystal radio circuit is sensitive to light of all kinds. It responds to sunlight, light-bulbs, laser, flashlights, and even candlelight! The laser will work to activate sound from the radio from many feet away, but only when the laser light is actually moving across the diode. Light-bulbs affect the radio diode from a couple of feet away, and the 60-cycle hum can be heard from them. The radio or light does not have to move to get sound in this case. Candlelight must be close and moving to affect the diode, and then it is a very low frequency that is hard to catch. The AU Pitch control must be raised high to hear the low bass sound from the flame. See CandleSetup screenshot, below.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 12: Spooky Effect # 4 - Make Freaky Music The computer monitor, speakers and the computer itself are all sources of cool and spooky sounds for the Spooky Tesla Spirit Radio. You can go for extreme feedback and resonance effects, or you can keep it simple and just hear what's going on inside your computer box.

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 13: Spooky Effect #5 - Van Eck Phreaking What is Van Eck Phreaking? Wikipedia: "Van Eck Phreaking is the process of eavesdropping on the contents of a CRT and LCD display by detecting its electromagnetic emissions." Can a crystal radio circuit really sense the colours and movements of windows on a computer screen??

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/


step 14: Spooky Effect #6 - Make Fright With A Mike Who would have thought it was possible, but the addition of a magnet on the side of the jam jar can turn the radio into a temporary microphone! Experiment with holding a neodymium magnet close to the ferrite coil inside the jam jar. Then talk at or into the jam jar. Hit the record button in Audio Hijack to see if it records the sound. It will be faint in the background...perfect for recording alien or scary voices! Use the Super-Sensitive audio set-up for this experiment.

Image Notes 1. Au Pitch Controls... Approximate the settings shown. 2. Au Bandwidth Control. Approximate the settings. 3. Reverb Control. Approximate the settings or adjust to suit. 4. Note positions of knobs. 5. Maxed out gain. Turn back if excess feedback. 6. Audio Hijack audio software for the Mac. (sorry no PC version) Mac users can download a free trial version.

step 15: Spooky Effect # 7 - There's A Woodpecker In Your Modem! Wireless modems put out a strong EM (ElectroMagnetic) pulse when operating...even if you are not using the wireless part of the modem. I discovered that a modem pulses at about 10 Hz, and sounds very similar to the controversial Russian Woodpecker radar transmissions. (http://en.wikipedia.org/wiki/Russian_Woodpecker). Other electronic and electric items such as calculators, cellphones, and computers can be investigated to hear what fields they emit. Motors like a Dremel tool are also fun to listen to...but not for very long!

Image Notes 1. This non-powered crystal radio circuit detects the EMP (electromagnetic pulse) of the wireless modem from several feet away. 2. Knock, knock, knock, who is there? This modem sounds like a woodpecker!

http://www.instructables.com/id/Spooky-Tesla-Spirit-Radio/

Image Notes 1. Au Pitch Controls... Approximate the settings shown. 2. Au Bandwidth Control. Approximate the settings. 3. Reverb Control. Approximate the settings or adjust to suit. 4. Note positions of knobs. 5. Maxed out gain. Turn back if excess feedback. 6. Audio Hijack audio software for the Mac. (sorry no PC version) Mac users can download a free trial version.


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Bill Brown Bill's TAK- tenna Home QSL Cards 1980's QRPp Transceiver -- Simple Kit -Pixie FOHI 1981

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Yorba Linda Fire Jack and Bonnie

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HomeBrewed TAK- tenna

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Bill's- HomeBrewed Pan Cake - 40 Meter TAK-tenna or Tak Antenna

Bill and Maggie Wedding Dog Bandit Dog - Molly Ham Radio KA6KBC - Nerd Homebrew QSL Bill's TAK- tenna

Project Overview: So I've been reading about this Small Space antenna (Small Space HF Antenna) that is being sold as the TAKTenna. Really neat idea - Has a 30 inch boom and Spiral Coils on the ends. See a picture at http://www.taktenna.com/

Stealth Dipole

Looks easy to build - Right ?

WB6CGN-My Dad WB6CGN-History WA6DVK WB6HJJ Novice Station Ham Operators That I Know Bill's Patents Hiking - Chino Hills Troop 512 Fontana Pete Seeger Train Trip Pixie Transceiver Breakfast Song Patio Room Links Engineering Technology Universal Electronics -

So I Built my version out of wood - Mine is very ugly as compared to the store bought one (See Pictures). Materials and Tools โ€ข Parts: 1.)

3 - Wooden sections - 1 1/2 in X 1/2 in X 8 ft - Cost 92 Cents each - Home Depot

2.) 1 - 100' Spool of Steel Guide/fence Wire - Cost - $7 - Home Depot - The purchased version uses some type of "Special" patented wire, but this seemed fine. I tried Copper, but it was not stiff enough to make the Spiral Coils. Again from quick test it did not seem critical - From what I read larger gauge wire is better for improved band width. 3.)

1 - 25 foot RG8 coax with PL259 - Radio Shack - Close Out - $5

4.)

2 - Packages - Nuts/Bolts - $2 - Home Depot

5.)

2 - Aligator Clips - Free from my junk Box.

6.)

Few Feet of Electrical Tape - Free from my junk Box. Total Material Cost: $16.76

The commercial version uses PVC and tie wraps, which would have been much easier.

file://C:\Documents and Settings\el cid\Meus documentos\TAK ANTENA\id3.html

18/10/2009


HomeBrewed TAK- tenna

Pรกgina 3 de 12

Tools: a.) Saw - I just used a simple hand saw. b.) Drill with wood bits - I just used a simple hand electric drill. c.) Flat Screw Driver and Rubber Malet. d.) Wire Cutters. e.) Gloves and Eye Protection.

Fab Time: For my version was about 4 hours - Drilling Lots of Holes and feeding the wire in to make the Spiral Coils was most of the work. Testing: However - Test wise it isn't bad I got it tuned up on 40 meters at about 8 feet off the ground and it has an SWR 1:2 to 1:5 from 7.30 to 7.175 MHZ (Without a Transmatch). Also does ok on 15 meter - Tune up wise. Bad news the performance is not Great - Signal pick up is several S units below my Dipole, but it does work. From what I have read the Antenna has problems in that most of the performance is based on feedline radiation (See the links below). http://groups.google.ie/group/rec.radio.amateur.antenna/browse_thread/thread/167fb7a34305cf3e http://lists.contesting.com/_antennaware/2008-04/msg00021.html Summary of Results: I'm still testing and it was an interesting experiment. The Antenna fits into a small space 25 inch X 30 inch. Hey it

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HomeBrewed TAK- tenna

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works. If you have no space it might be worth $20 and a few hours of your time or If you aren't a Homebrewer Buy one. If you make your own one point - I needed more wire than the 468/7.2 MHZ = 65 Feet Total or 32.5 Feet per side - I had to add wire after the fact. So I would make it about 33.5 per side. Measurements: One more added item - Someone had a question about my dimensions: Boom = 30 inches meaning Cross Pieces are about 30 inches a part. Cross Pieces = 25 Inches Across or 12.5 Inches from center Hole Spacing from Center, but this did not seem critical, but I used: 12 in 11 in 10 in 9 in 8 in 7 in 6 in 5 in 4 in 3 in Total Turns = 10

Tuning: a.) Put the antenna in the expected operating position (Mine was about 8 feet in the air).

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18/10/2009


HomeBrewed TAK- tenna

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b.) Conect the Coax via the Aligator Clips about 2 inches from the end of the smallest inner Spiral Coils. c.) Measure SWR in the Center of the 40 Meter Band (SSB or CW) you intend to use most. high move to Step d. d.)

Move the Aligator Clips/Coax out evenly about 2 inches on each Spiral Coil.

e.)

Repeat Step c.

If the SWR is too

I was able to acheive acceptable SWR after about 3 cycles of adjustment without a Transmatch.

Construction Steps: a.)

Measure/Cut - (1) - 30 inch boom section.

b.)

Measure/Cut (4) - Cross members - 25 inches sections.

c.) Measure/Notch @ about 12.5 Inches - I just cut with a hand saw then tapped out with a Flat Screw Driver and Rubber Malet. d.) Drill holes in Cross members as noted above - Starting 3 inches from center then working out in 1 inch steps out to 12 inches. If you are careful you can save sometime by drilling two parts at a time. e.) Here is the Hard part - Put the Notched Cross members together then start feeding the wire to create the Spiral Coils. I started from the biggest to the smallest. I would recommend Gloves and Eye Protection. f.)

Once the Spiral Coils are completed bolt them to the Boom.

g.)

I then used the last section of wood for mast and bolted the Boom to this part. 73's

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HomeBrewed TAK- tenna

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Bill - KA6KBC 40m Homebrew Tak-ntenna (http://forums.qrz.com/showpost.php?p=1250593&postcount=1)

Credit Where Credit is Due: Very important work on this orignial Design was done first by: Bill Petlowany, K6NO http://www.qsl.net/wa2lqo/nlaug03.html http://www.wr6wr.com/newSite/articles/features/olderfeatures/antennaswithtwist.html Then Refined by: Steve – WA2TAK http://www.tak-tenna.com/ Also some very interesting Recent work from WBillJohnson - Looking at Boom Lengths and Coils Spacing: http://wbilljohnson.com/zmvantenna/zmvantenna.htm#intro Older Patent Info (Same Last Name, but no relation): http://bvarc.freeshell.org/newsletter/BVARC_December_2007.pdf http://www.google.com/patents?id=aZluAAAAEBAJ&printsec=abstract&zoom=4&dq=3432858#PPA1,M1

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HomeBrewed TAK- tenna

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jun13671.jpg

old_school_2.jpg

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HomeBrewed TAK- tenna

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Pรกgina 10 de 12

80 Meter - Tak Tenna - Version Calculations: I used Circumference of a Circle = 2*3.14* r ~ This is not perfect as this assumes we complete the full circle each time, but really don't. This should get you in the ball park. If you start from the center and work out - The 16th loop will not be a full loop. You might need make some adjustments, but it should be a good start. From Center: 16 15 14 13 12 11 10 9 8 7 6 5 4 3

100.48 94.2 87.92 81.64 75.36 69.08 62.8 56.52 50.24 43.96 37.68 31.4 25.12 18.84

Total - Inches: 835.24 Total - Feet: 69.60 Per Leg 60.78 (468/3.85MHZ) ~ 62.6 Feet per Leg assuming margined up 3%.

40 Meter - Tak Tenna - Version Calculations:

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18/10/2009


HomeBrewed TAK- tenna

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I used Circumference of a Circle = 2*3.14* r ~ This is not perfect as this assumes we complete the full circle each time, but really don't. This should get you in the ball park. If you start from the center and work out - The 12th loop will not be a full loop. You might need make some adjustments, but it should be a good start. From Center: 12 11 10 9 8 7 6 5 4

Amount of Wire: 75.36 69.08 62.8 56.52 50.24 43.96 37.68 31.4 25.12

Total (In): Total (Ft):

452.16 37.68

Dipole: Half Wave Dipole: Side

468/7.2 = 65 Feet or 32.5 Feet per

Margined up by 3%: 33.5 Feet per Side.

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18/10/2009


HomeBrewed TAK- tenna

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RF & Microwave filters, amplifiers couplers,terminations,antennas

Install antennas without coax Move antennas 10-km from CP

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4.4 - 5.8 GHZ, 7, 9, 12 dBi gain Antennas for UAV, Aviation, Mobile

www.www.amcrf.com

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18/10/2009


HomeBrewed TAK- tenna

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Ação cancelada O Internet Explorer não conseguiu se conectar à página da Web solicitada. A página pode não estar disponível no momento. Ads by Google

M2M Antennas

Tower - Monopole - Mounts

WiFi Antennas Online

Machine to Machine Antennas for up-to-date communications

Factory Direct Quotations Shelters - Cabinets - plus ZINGA

2.4 & 5.8 GHz - Omni to High Gain Brilliant innovations reduce costs.

www.panorama-antennas.com

www.telepp.com

www.poyntingdirect.co.za

Bill Brown Bill's TAK- tenna Home QSL Cards 1980's QRPp Transceiver -- Simple Kit -Pixie FOHI 1981

Bill's- HomeBrewed - 40 Meter TAK-tenna or TAK Antenna jun13677.jpg

Yorba Linda Fire Jack and Bonnie

file://F:\id3.html

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21/9/2009


HomeBrewed TAK- tenna

Pรกgina 2 de 12

Bill's- HomeBrewed Pan Cake - 40 Meter TAK-tenna or Tak Antenna

Bill and Maggie Wedding Dog Bandit Dog - Molly Ham Radio KA6KBC - Nerd Homebrew QSL Bill's TAK- tenna

Project Overview: So I've been reading about this Small Space antenna (Small Space HF Antenna) that is being sold as the TAKTenna. Really neat idea - Has a 30 inch boom and Spiral Coils on the ends. See a picture at http://www.taktenna.com/

Stealth Dipole

Looks easy to build - Right ?

WB6CGN-My Dad WB6CGN-History WA6DVK WB6HJJ Novice Station Ham Operators That I Know Bill's Patents Hiking - Chino Hills Troop 512 Fontana Pete Seeger Train Trip Pixie Transceiver Breakfast Song Patio Room Links Engineering Technology Universal Electronics -

file://F:\id3.html

So I Built my version out of wood - Mine is very ugly as compared to the store bought one (See Pictures). Materials and Tools โ€ข Parts: 1.)

3 - Wooden sections - 1 1/2 in X 1/2 in X 8 ft - Cost 92 Cents each - Home Depot

2.) 1 - 100' Spool of Steel Guide/fence Wire - Cost - $7 - Home Depot - The purchased version uses some type of "Special" patented wire, but this seemed fine. I tried Copper, but it was not stiff enough to make the Spiral Coils. Again from quick test it did not seem critical - From what I read larger gauge wire is better for improved band width. 3.)

1 - 25 foot RG8 coax with PL259 - Radio Shack - Close Out - $5

4.)

2 - Packages - Nuts/Bolts - $2 - Home Depot

5.)

2 - Aligator Clips - Free from my junk Box.

6.)

Few Feet of Electrical Tape - Free from my junk Box. Total Material Cost: $16.76

The commercial version uses PVC and tie wraps, which would have been much easier.

21/9/2009


HomeBrewed TAK- tenna

Pรกgina 3 de 12

Tools: a.) Saw - I just used a simple hand saw. b.) Drill with wood bits - I just used a simple hand electric drill. c.) Flat Screw Driver and Rubber Malet. d.) Wire Cutters. e.) Gloves and Eye Protection.

Fab Time: For my version was about 4 hours - Drilling Lots of Holes and feeding the wire in to make the Spiral Coils was most of the work. Testing: However - Test wise it isn't bad I got it tuned up on 40 meters at about 8 feet off the ground and it has an SWR 1:2 to 1:5 from 7.30 to 7.175 MHZ (Without a Transmatch). Also does ok on 15 meter - Tune up wise. Bad news the performance is not Great - Signal pick up is several S units below my Dipole, but it does work. From what I have read the Antenna has problems in that most of the performance is based on feedline radiation (See the links below). http://groups.google.ie/group/rec.radio.amateur.antenna/browse_thread/thread/167fb7a34305cf3e http://lists.contesting.com/_antennaware/2008-04/msg00021.html Summary of Results: I'm still testing and it was an interesting experiment. The Antenna fits into a small space 25 inch X 30 inch. Hey it

file://F:\id3.html

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works. If you have no space it might be worth $20 and a few hours of your time or If you aren't a Homebrewer Buy one. If you make your own one point - I needed more wire than the 468/7.2 MHZ = 65 Feet Total or 32.5 Feet per side - I had to add wire after the fact. So I would make it about 33.5 per side. Measurements: One more added item - Someone had a question about my dimensions: Boom = 30 inches meaning Cross Pieces are about 30 inches a part. Cross Pieces = 25 Inches Across or 12.5 Inches from center Hole Spacing from Center, but this did not seem critical, but I used: 12 in 11 in 10 in 9 in 8 in 7 in 6 in 5 in 4 in 3 in Total Turns = 10

Tuning: a.) Put the antenna in the expected operating position (Mine was about 8 feet in the air).

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b.) Conect the Coax via the Aligator Clips about 2 inches from the end of the smallest inner Spiral Coils. c.) Measure SWR in the Center of the 40 Meter Band (SSB or CW) you intend to use most. high move to Step d. d.)

Move the Aligator Clips/Coax out evenly about 2 inches on each Spiral Coil.

e.)

Repeat Step c.

If the SWR is too

I was able to acheive acceptable SWR after about 3 cycles of adjustment without a Transmatch.

Construction Steps: a.)

Measure/Cut - (1) - 30 inch boom section.

b.)

Measure/Cut (4) - Cross members - 25 inches sections.

c.) Measure/Notch @ about 12.5 Inches - I just cut with a hand saw then tapped out with a Flat Screw Driver and Rubber Malet. d.) Drill holes in Cross members as noted above - Starting 3 inches from center then working out in 1 inch steps out to 12 inches. If you are careful you can save sometime by drilling two parts at a time. e.) Here is the Hard part - Put the Notched Cross members together then start feeding the wire to create the Spiral Coils. I started from the biggest to the smallest. I would recommend Gloves and Eye Protection. f.)

Once the Spiral Coils are completed bolt them to the Boom.

g.)

I then used the last section of wood for mast and bolted the Boom to this part. 73's

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Bill - KA6KBC 40m Homebrew Tak-ntenna (http://forums.qrz.com/showpost.php?p=1250593&postcount=1)

Credit Where Credit is Due: Very important work on this orignial Design was done first by: Bill Petlowany, K6NO http://www.qsl.net/wa2lqo/nlaug03.html http://www.wr6wr.com/newSite/articles/features/olderfeatures/antennaswithtwist.html Then Refined by: Steve – WA2TAK http://www.tak-tenna.com/ Also some very interesting Recent work from WBillJohnson - Looking at Boom Lengths and Coils Spacing: http://wbilljohnson.com/zmvantenna/zmvantenna.htm#intro Older Patent Info (Same Last Name, but no relation): http://bvarc.freeshell.org/newsletter/BVARC_December_2007.pdf http://www.google.com/patents?id=aZluAAAAEBAJ&printsec=abstract&zoom=4&dq=3432858#PPA1,M1

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jun13671.jpg

old_school_2.jpg

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80 Meter - Tak Tenna - Version Calculations: I used Circumference of a Circle = 2*3.14* r ~ This is not perfect as this assumes we complete the full circle each time, but really don't. This should get you in the ball park. If you start from the center and work out - The 16th loop will not be a full loop. You might need make some adjustments, but it should be a good start. From Center: 16 15 14 13 12 11 10 9 8 7 6 5 4 3

100.48 94.2 87.92 81.64 75.36 69.08 62.8 56.52 50.24 43.96 37.68 31.4 25.12 18.84

Total - Inches: 835.24 Total - Feet: 69.60 Per Leg 60.78 (468/3.85MHZ) ~ 62.6 Feet per Leg assuming margined up 3%.

40 Meter - Tak Tenna - Version Calculations:

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I used Circumference of a Circle = 2*3.14* r ~ This is not perfect as this assumes we complete the full circle each time, but really don't. This should get you in the ball park. If you start from the center and work out - The 12th loop will not be a full loop. You might need make some adjustments, but it should be a good start. From Center: 12 11 10 9 8 7 6 5 4

Amount of Wire: 75.36 69.08 62.8 56.52 50.24 43.96 37.68 31.4 25.12

Total (In): Total (Ft):

452.16 37.68

Dipole: Half Wave Dipole: Side

468/7.2 = 65 Feet or 32.5 Feet per

Margined up by 3%: 33.5 Feet per Side.

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Ação cancelada O Internet Explorer não conseguiu se conectar à página da Web solicitada. A página pode não estar disponível no momento. Ads by Google

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21/9/2009


TAK-tenna. Antenas raras para soluciones raras.

ANTENAS ESPECIALES PARA SITIOS REDUCIDOS Y SITUACIONES ESPECIALES.

El otro día navegando por la red me apareció por casualidad un enlace con las antenas TAK, TAK-tenna de un colega americano que tiene pendiente su patente, os aconsejo que visitéis su página; http://www.tak-tenna.com/ Esta antena es una antena de reducido tamaño, el modelo es PET windon, una veterana antena, y como bien narra en su blog el amigo Fernando EA7HFW, es una antena dipolo 1/2 onda en espiral construida con tubos de PVC de fontanería que sustentan y dan forma a los ramales. Apenas tiene 80 x 80 cm. y a unos 4 m. del suelo funciona perfectamente dando un ancho de banda de 55 KHz. con una ROE menor de 1:1,2. Dado su carácter de dipolo y su tamaño es altamente directiva, presentando una atenuación de aprox. 18 Db sobre las puntas con respecto al F/B, en transmisión su rendimiento es sorprendente, asemejándose a la de un dipolo normal. La alimentación es con coaxial de 50 ohmios y la adaptación es perfecta, no presentando retorno de RF y por tanto no necesita de choque alguno, aunque personalmente le puse un


balun 1:1. Físicamente no presenta ningún calentamiento de la espiral (señal que radia), pensada y construida para que aguante perfectamente las "ayudas" de hasta 1 Kw. Es discreta y perfecta para días de campo-playa y cambiando la constructiva del PVC por tubos de fibra de vidrio la puedes poner fija y si le añades un pequeño rotor no dudo te sorprenderá. También se comporta como omnidirecional si la instalas verticalmente Evidentemente no pretendas sustituir tu maravilloso dipolo de ventitantos metros colocado sobre tu torreta a 10 metros del suelo, pero fabrícala y compárala con esta de 0.8 x 0.8 m. a solo 4 m. del suelo para 7 MHz. Podéis visitar la página de Fernando: http://ea7hfw.blogspot.com/ Me ha seducido mucho esta antena ya que es de fácil construcción, y reducido tamaño, para portable ideal, y para colocarla en el balcón de casa como un tendedero de ropa por ejemplo. Ideal para colocarla en cualquier sitio pequeño, y con un poquito de inventiva pasa desapercibida, o eso espero. Manos a la obra y a cacharrear. Como podéis ver con este material esta hecha. 22 m. hilo cobre rígido de 2,5 mm 0,8 m. cable flexible aislado de 2,5 mm 4 tubos fontanería PVC a 80 cm. de 20 mm. 1 tubo fontanería PVC a 80 cm. de 40 mm. 3 tapones ciegos PVC de 40 mm. 6 tapones ciegos PVC de 20 mm. 2 pinzas cocodrilo, 1 brida para mástil, 1 tubo de pegamento PVC, 2 tornillos métrica 5 de 50 mm., 4 tuercas y 4 arandelas Voy probarla y ya os cuento. EA5GU Paco Hernandez


ZMV Spiral Antenna

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Revised 8/24/08 7:14 AM. Changes, inclusion of Model Verification, and wording changes. Introduction And Conclusions Background Mechanical Design Designing The Spiral Antenna With The Spiral Spreadsheet Model Run The Spreadsheet The Effect Of Beam Length And Spiral Diameter On SWR and Bandwidth Model Verification Future Work Introduction And Conclusions top An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band. Summary of results 1. Beam length has a significant effect on SWR response. Increasing the distance between spirals increases the antenna's resonant frequency. Beam length can be used to fine-tune a spiral antenna to the desired resonant frequency. 2. The combined length of antenna and hookup wire has a significant effect on the antenna's resonant frequency. The longer the combination, the lower the resonant frequency. 3. The diameter of a spiral antenna affects its bandwidth, as measured by the frequency range where the SWR is equal to or less than a value of 2. Increasing spiral diameter increases bandwidth. Background top TAK markets and sells a 40-meter antenna that is a unique arrangement of a simple dipole where the quarter wave sections are wound into flat spirals instead of being arranged in a straight line. The advantage of this configuration lies mainly in its compact size. The finished antenna easily fits into a 3-foot cube.

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TAK Antenna George Mann, the president of the Lakeland Radio Amateurs Club was kind enough to let me study his TAK antenna. For this experiment the TAK's major drawback was its fixed length beam. An easy to construct design that overcame this shortcoming was needed. Materials used to construct an adjustable length beam antenna are available at any home center and consist mainly of PVC electrical conduit, and two sizes of PVC water pipe. Fourteen-gauge aluminum wire was chosen for the antenna because of its low cost. Design and Construction Of An Adjustable Beam Spiral Antenna top Construction consisted mainly in cutting PVC to length and drilling holes. A modified spade bit, ground to the diameter of the gray PVC conduit used for the cross arms, was used to drill holes in the movable sections of the beam. To insure that the holes were at right angles to each other, a simple jig was used to hold the beam member during the drilling operation.

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Drilling Jig The image above shows the jig in use during the drilling operation. After the first pair of through-holes are drilled, a piece of scrap PVC is inserted through these holes, and the piece is then returned to the jig with the scrap PVC now resting on the locating rails. This insures that the next pair of holes in the PVC will be at right angles to the first pair.

One Of Two End Sections

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In the above photo, the larger diameter PVC has been drilled and the spiral arms inserted. The two cross members are secured with a single self-tapping screw.

Arm Attachment

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Adjustable Beam Length In contrast with the TAK, the beam in this design is not one but three pieces. Two hold the spiral supporting arms, while the third, smaller in diameter section, fits into the other two. This arrangement produces an adjustable beam. The above image shows how one section slides over the other, in trombone fashion, allowing for the beam length to be varied. Spiral Antenna Design top The primary spiral antenna design parameters are: the desired resonant frequency, the length of the hook up wire that connect the antenna to the coax, and the minimum distance the antenna wire is allowed to come to the end of any one PVC support arms. Once these parameters have been determined, many spiral designs are possible by varying the spiral pitch, or distance between turns, and the starting distance from the hub of the spiral. From a mechanical perspective the most important design consideration is how close the outermost end of the antenna wire comes to its supporting spoke. An antenna wire that is an inch too short will leave a large section of antenna wire unsupported, whereas one that is an inch or two longer than needed to reach the last support is easily tolerated, and may even be an advantage in subsequent tuning. Therefore, it is important to choose

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pitch and start values with this in mind. Calculating the effects of starting distance and pitch on a known length of wire can be tedious, and finding the combination that satisfies the condition that the wire reach the last spoke with little or no overhang can be daunting. To address these concerns a spiral antenna spreadsheet model was created to do the calculations for the designer. For clarity the spreadsheet begins with a graphic showing the spiral antenna's most important parameters which are: start point, pitch, safe edge, spoke length, and arm length.

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A table of inputs and outputs follows the diagram. Inputs are in peach, outputs are in yellow colored cells. The designer enters the desired frequency, the length of hookup wire, assumed velocity factor, and safe edge. In response, the spreadsheet calculates the required length of antenna wire in both inches as well as feet and inches. The spreadsheet does its calculations in inches, but the user will find the conversion to feet and inches more practical when cutting wire to length. Of the remaining two boxes, one is labeled pitch, or the distance between turns, and the

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other is labeled start, or the distance from the hub to the point on spoke R1 where the antenna will start. Adjacent to these two inputs are two outputs labeled turns and min spoke. The significance of turns is that values ending in 0, .25, .5, or .75 signify that the end of the outermost lap of wire just reaches a spoke. A value not ending in one of the above fractions means that the antenna wire will end between spokes. As mentioned above, a little over is much more desirable than a little under. Minimum spoke determines the overall size of the antenna. In fact the diameter of the antenna will be twice this value. The length of the cross arms will be twice the sum of the min spoke plus the safe edge.

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The overall antenna diameter is calculated as values for pitch and start are entered. The same is true for the overall arm length, the measurement needed to cut the support arms to proper length. Kerfs, or saw cuts made in the PVC support arms, in combination with plastic wire-ties, are used retain the antenna wire. The spreadsheet creates a kerf cutting table based on the pitch and start values entered. In practice two cross arms are placed at right angles to each other forming a plus sign. Then in either clockwise or counter clockwise fashion, spokes are labeled R1 through R4. The center is marked on each arm, and the table values are then transfered to each spoke, starting at the center of each arm and working out to the end. The Effect Of Beam Length On SWR top (Note: all SWR measurements were made using the MFJ Model xxx antenna analyzer. In each case the test antenna was raised thirteen feet above the ground and connected to the analyzer through approximately 60 feet of RG8 mini coax.) The following graph shows the result of beam length on SWR. It is clear from these data that as the beam is lengthened, or the spirals are moved farther apart, the resonant frequency is increased. In this experiment the separation was varied from 27 to 37 inches in two-inch increments. Over this distance the resonant frequency shifted approximately .18 MHz or just over half the 40-meter bandwidth.

SWR vs Separation

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The Effect of Spiral Diameter On Bandwidth top Spiral diameter has an effect on bandwidth. Two antennas were compared, one with a 32-inch diameter spiral, and another with a 48-inch diameter spiral. Tracing along the line equal to an SWR of 2 the bandwidths of each variation can be compared. In this experiment the frequency range at or below an SWR of 2 was much greater for the 48-inch model than for the 32-inch model. The two horizontal lines at the bottom of the chart represent this difference and are equal in length to the bandwidths of the 32 and 48-inch antennas respectively. See figure below.

Comparison of 32 vs. 48-Inch Arm Length Model Verification - Does the model work? top A model is only as good as the results it produces. To test the validity of the spiral antenna model an antenna was constructed according to the following parameters. See table below. After selecting the resonant frequency, hookup wire length, and velocity factor, pitch and start values were varied to produce an antenna with a slight overhang past its last supporting point. This is one of many configurations that could have been selected.

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The exact length predicted by the model was marked on a length of 14-gauge aluminum wire. The wire was then cut a few inches longer than required. Next, two spirals were wound according to the table above. The model predicts that there will be 6.06 revolutions. The

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additional .06 revolutions amounts to 21.6 degrees and equates to an approximate distance along the outermost lap of this spiral design of 5.8 inches. The average overhang for both test spirals was just over an inch less than the theoretical value. This discrepancy can easily be accounted for by construction technique. After attaching the spirals to a beam, a series of SWR tests were made. In each case the antenna was connected to 60 foot of RG8 mini and elevated 13 feet above the ground. The antenna wire length was intentionally set long to insure that it would not be necessary to add extra wire in the tuning process. Consequently, initial SWR measurements suggested that the resonance point was low. Material was removed from the outer lap of each spiral until the exact length of antenna wire determined by the model was reached. At that condition the resonant frequency was 7.075 MHz. The aim was 7.15MHz. After two additional inches of antenna wire were removed from the outermost lap of each spiral, the resonant frequency increased to 7.096 MHz. Beam length was then increased by 4 inches to arrive at a final spiral separation of 28.75 inches. This brought the resonant frequency to 7.17 MHz, slightly above aim and favoring the voice portion of the 40-meter band. The following graphic shows the SWR response as a function of frequency before and after the final length adjustment. After adjustment, the SWR vs. Frequency curve can be seen to shift to the right.

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Extending the beam shifts the curve to the right. Summary top The spiral antenna spreadsheet model accurately predicts the number of revolutions expected for a given antenna length, pitch, and starting distance from the center of the spiral. The spiral spreadsheet model has proved to be a useful tool for designing and building spiral antennas for the 40-meter band. Future Work top There are many possibilities for future investigation. Some suggestions are:   

The effect of wire gauge on SWR and bandwidth. Directional properties of the spiral antenna. The inclusion of a calculator within this web page

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EA3NU ANTENAS RECOPILACIร“N DE DATOS INFORMATIVOS SOBRE TODO TIPO DE ANTENAS PARA RADIOAFICIONADO

VIERNES 27 DE FEBRERO DE 2009

Click here for Myspace Layouts PUBLICADO POR RAMON EN 2:28

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Antena EH para banda de 20 metros Antena EH para banda de 20 metros PUBLICADO POR RAMON EN 1:22

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Discover Nusrat Fateh Ali Khan!

DOMINGO 15 DE FEBRERO DE 2009

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Antena yagui 5 elementos para experimentación en 28.5 Mhz, banda de 10 mts.

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La antena yagui 105YRN es un modelo para la banda de10 mts. y trajaja en las frecuencias sercanas a los 28.5 mhz. Con ella podrás lograr buenos comunicados desde tu estación fija con otra

Mié, 30 Sep 2009 01:32

móvil o fija usando un rotor. La puedes instalar en polarizaciòn horizontal o vertical. Ahora bien antes de usarla asegurate de ajustar la abrazadera que une el elemento excitado con el gamma mach, para ponerla a un mínimo de R.O.E. (Relaciòn de Ondas estacionarias ) de acuerdo a la

DISEÑO DE ANTENAS

http://www.qsl.net/xe3rn/ antenas.htm

frecuencia en 10mts. que quieras usar. ANTENAS DE RADIOAFICIONADOS TRADICIONALES

El gamma match: Se fabricará con un tubo de

web.madritel.es

aluminio de 1/2" y dentro del miso se introducirá un pedazo de coaxial RG8 de 75 cm., al cual se le

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eliminará el forro y la malla quedando únicamente el forro que protege al cable del centro para producir un aislamiento entre el tubo de aluminio y el cable que va soldado al conector previamente

ANTENA 6 METER OMNI HALO

http://www.hamuniverse.c om/6mloop.html

fijado en el boom de la antena direccional , cerca del elemento excitado respetando las longitudes y detalles que a continuación menciono para ajustar

CALCULO DE DIPOLOS

la ROE (relación de ondas estacionarias). La

http://www.ea1uro.com/di separación entre el gamma y el elemento excitado es polo.htm de 5 cm. El diámetro de los elementos va ir disminuyendo de 5/8" A 1/2" en partes iguales

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DATOS PERSONALES RAMON VER TODO MI PERFIL

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▼ 2009 (21) ▼ febrero (3) Click here for Myspace Layouts Antena EH para banda de 20 metros Antena yagui 5 elementos para experimentación en 2... ► enero (18)

EL TIEMPO EN REUS

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ENLACES

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EA3NU CON LA RADIOAFICIÓN

blogs.ya.com MIÉRCOLES 28 DE ENERO DE 2009

Dipolo corto para la banda de 160 mts

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DOMINGO 25 DE ENERO DE 2009

Antena Quad,Calculo y construcciテウn Quad Antenna JavaScript Calculator for CB and

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Amateur Radio Communications PUBLICADO POR RAMON EN 19:26

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MEDIO AMBIENTE

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Caracteristicas de construcciテウn de una antena Quad VHF Quad VHF PUBLICADO POR RAMON EN 5:15

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Antena Quad la "colorada" !! monobanda 28 MHZ.-4elementos Elemento---Total Cuadro---Por Lado---Largo de cruz

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Reflector----11,033 ---------2,758-------3,900

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Exitado------10,768----------2,692-------3,807

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Director-1---10,445----------2,611-------3,692 Director-2---10,400----------2,600-------3,676 Entre elementos 1,615 PUBLICADO POR RAMON EN 4:42

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VIERNES 23 DE ENERO DE 2009

Antena para 50 Mhz hecha con restos de una silla. Antena para 50 Mhz hecha con restos de una

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Antena direccional tres elementos monobanda Antena mpdelo PUBLICADO POR RAMON EN 19:05

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EH Antenna Systems EH Antenna Systems PUBLICADO POR RAMON EN 18:36

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Antena plano Tierra (métrico) Versión traducida de http://www.qsl.net/lu1awf/antena/11.htm PUBLICADO POR RAMON EN 17:19

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Diseña tu propio 5 / 8 onda antena vertical Versión traducida de http://www.qsl.net/lu1awf/antena/13.htm PUBLICADO POR RAMON EN 16:43

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Dise帽a tu propio Quad Versi贸n traducida de http://www.qsl.net/lu1awf/antena/14.htm PUBLICADO POR RAMON EN 16:28

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MARTES 20 DE ENERO DE 2009

Construcci贸n de una antena rotativa DELTA LOOP para 6 m.

PUBLICADO POR RAMON EN 16:54

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Construcci贸n de una antena SLOPER

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Creaci贸n de un balum 4:1 cable coaxial por EA1ABZ ANTENA DE SINTONIA REMOTA

ANTENA DE SINTONIA REMOTA ANTENA PARA 160 Y 80 MTS

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PUBLICADO POR RAMON EN 16:21

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Sテ。ADO 17 DE ENERO DE 2009

Construcciテウn antena vertical 20,30,40 mtrs

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PUBLICADO POR RAMON EN 3:27

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JUEVES 15 DE ENERO DE 2009

ANTENA DE ARO 10-20 metros

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PUBLICADO POR RAMON EN 23:42

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Antena Dipolo para 40 y 80 metros

Antena Dipolo para 40 y 80 metros

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Esta antena dipolo para las bandas de 40 y 80 metros tiene un buen rendimiento y es sencilla de construir, por ello no debería dar problemas en su construcción. Los dípolos de media onda (y sus múltiplos impares) tienen en el punto de alimentación una impedancia, teórica de 75 ohmios que al ser parecida a la del transmisor (50 ohmios) nos permitirá su alimentación sin problemas sin tener que recurrir a adaptadores de impedancia, en el peor de los casos la R.O.E. debería estar a 1,5. Si las ramas del dipolo se colocan en "V" invertida formando un angulo de 120 a 90 grados, su impedancia desciende acercándose hasta los 50 ohmios lo que parece ser ideal. No obstante se deforma ligeramente el lóbulo de radiación y al acercarse sus extremos al suelo u obstáculos adyacentes se empeora su rendimiento.

El calculo practico para el dipolo de 40 m. seria,

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eligiendo como frecuencia central los 7.050 Mhz: L = 142,5/F L = 142,5/7,050 L = 20,21 m. Esta será la longitud total del elemento radiante, pero como hay que alimentarlo en el centro, será necesario partirlo en dos, o sea cada rama tendrá: l = L/2 l = 20,21/2 l = 10,105 m. La realización practica consistirá colocar 10 metros en cada uno de los brazos y al final de cada uno dejaremos colgando unos 40 cm. de cable, este bigote lo usaremos para el ajuste. A continuación de la bobina de carga, cada brazo se prolonga con 1,45 metros de cable, más 40 cm para su correspondiente bigote, de tal modo que todo el conjunto resonará en 80 metros Las dos bobinas de carga se construyen bobinando 36 espiras juntas de hilo barnizado de 1,5 mm de

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diámetro sobre un tubo de PVC o similar de 75 mm de diámetro y unos 12 cm de longitud. La bobinas y las conexiones deben protegerse (silicona, cinta aislante, etc). para la bobina puede ser una buena solución la protección con tubo termoretráctil. La separación entre las dos ramas no es critica y puede ser de unos 5 ó 10 cm. Pero generalmente vendrá determinada por el tipo de aislador central que se emplee. El diámetro del cable a emplear no es critico ya que este solo afecta al ancho de banda, pero en bandas bajas su efecto es totalmente inapreciable, pero si que habrá de tenerse en cuenta la tracción mecánica que tendrá que soportar, para que las dilataciones sean lo menor posibles, 2,5 ó 4 mm2 será adecuado en instalaciones fijas, en portátiles o experimentales será suficiente 1,5 mm2 o incluso menos. Para mantener las características de la antena dipolo, lo ideal seria alimentarla con cable paralelo

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de 75 ohmios y un acoplador a la salida del equipo, pero lo habitual es hacerlo con cable coaxial de 50 ohmios y colocarla en "V invertida" y formando los brazos en su unión un ángulo de unos 100 grados. En cualquier caso los primeros metros del cable de bajada deberán descender perpendicularmente a la antena. En el punto de alimentación es conveniente (pero prescindible) colocar un balum de relación 1:1 porque hay que tener en cuenta que la antena dipolo es simétrica y el cable coaxial asimétrico lo que deformaría el lóbulo de radiación. El balum, también unifica las dos ramas del dipolo en corriente continua y baja frecuencia lo que nos protege un poco ante las descargas atmosféricas y por último amortigua ligeramente los efectos de la diferencia de impedancia entre la antena y la línea de alimentación. Un balum normal de aire o ferrita nos cubrirá perfectamente de 10 a 80 metros y uno toroidal de 6 a 160 metros.

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El ajuste es muy sencillo y consiste en alargar o acortar los bigotes, no es necesario cortarlos, basta con enrollarlos sobre si mismos. Se empieza por 40 metros donde podemos conseguir un ajuste perfecto en toda la banda. A continuación se ajustan los 80 metros, en esta banda y debido a los efectos negativos que produce la inclusión de las bobinas de carga, solo tendremos un ancho de banda de unos 100 Khz para una ROE de 1:1,5 asi que será preciso escoger en que parte de la banda centraremos el ajuste. Un acoplador de antenas puede ayudarnos a cargar perfectamente la antena en todo el ancho de banda. Es conveniente (no imprescindible) hacer con el mismo cable coaxial dos bobinas de 4 ó 5 espiras de unos 20 ó 30 cm. de diámetro, una arriba, junto al balum o punto de alimentación de la antena y otra abajo junto al equipo. PUBLICADO POR RAMON EN 23:17

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ANTENA HELICOIDAL 7 Mhz. (40 m.) ANTENA HELICOIDAL 7 Mhz. (40 m.)

Una buena soluci贸n cuando el espacio disponible es peque帽o, es la Antena Helicoidadl, muy empleada en las antenas verticales para autom贸viles, consiste en enrollar todo el hilo de la antena en forma helicoiclal de paso variable.

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Con este sistema se consigue una bobina a lo largo de toda la antena, pero con influencia menor en el punto dé alimentación y mayor a medida que nos acercamos al extremo. En todos los casos, siempre se deja en la punta de la antena algún sistema que permita variar su longitud total con el fin de ajustarla exactamente a la frecuencia deseada.

Construcción El elemento radiante se lo construirá sobre un tubo de PVC reforzado de 1 1/2" x 3 m. de longitud, el cual irá montado como muestra la figura sobre una placa de metal protegida contra la corrosión de aproximadamente 20 cm. x 30 cm. doblada en "L" dejando 20 cm en la parte superior donde va sujeto el tubo, y 10 cm. a 90º en la parte inferior que va

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fijada a la superficie que va montada la antena. El tubo PVC, se lo fija a la placa con abrazaderas "U" de 1/4" de diámetro. Sobre el tubo PVC se arrolla 20,8 m de alambre esmaltado o cable forrado tipo Tw para instalaciones electricas Nº 14, con un espaciado regular y que cubra toda la parte superior del tubo PVC a partir de la placa en la parte inferior. Se debe cuidar que el arrollado sea firme para darle la suficiente fijación al alambre sobre el tubo. Ahora en la punta dejaremos un pequeño látigo de alambre de aproximadamente 50 cm. y lo sujetaremos con una amarra o abrazadera plástica autofijada. El largo del alambre arrollado debe ser un poco mas de la 1/2 longitud de onda de la frecuencia de trabajo.

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Esta versión puede funcionar perfectamente en el patio de su casa, o incluso en la terraza pero con la condición de que esté conectado a una buena tierra. Ahora, si la vamos a utilizar la antena elevada del piso con un mastil, entonces será necesario construirle cuatro o tres radiales fijados en la parte inferior de la antena.

Estos radiales son de construccion similar al elemento radiante solo que pueden ser de tubos de 1" por 2 m. de longitud. Sobre este tubo se arrollará 1/4 de longitud de onda más aproximadamente un 7 % del mismo alambre utilizado para el elemento radiante, aproximadamante para nuestro caso 11 metros.

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Todos los terminales de los alambres de los radiales serán conectados a la placa metálica, es decir a tierra (artificial en este caso). La placa de fijación cambia por una de 20 x 40 doblada en 90º como sugerimos anteriormente. Calibración Con ayuda de un medidor de ROE la calibraremos en la frecuencia central de trabajo, acortando poco a poco el látigo de la parte superior hasta obtener el mínimo ROE. En el caso de usar radiales, estos pueden ser modificados en su ángulo para variar la impedancia de trabajo de la antena 50 o 75 ohmios. Características Esta antena como todas la verticales tiene un bajo ángulo de disparo, lo que la hace propicia para DX,

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su tamaño compacto la hace muy práctica, y tiene una ganancia en dB como una antena 1/4 de onda plano-tierra. Al ser compacta, tiene un factor Q estrecho y por lo tanto un ancho de banda también pequeño, lo que no le permite trabajar con una baja ROE en toda la banda, además como todas las verticales tiene una recepción algo ruidosa. Pero para los colegas amantes de la experimentación estoy seguro que les dará gratas horas de trabajo. PUBLICADO POR RAMON EN 22:01

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ANTENA FACIL Y EFICIENTE ANTENA DE SINTONIA REMOTA

ANTENA DE SINTONIA REMOTA ANTENA PARA 160 Y 80 MTS

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Antenas - Radioafición - Cebeísmo Diexismo ____________________________________ ____________________________________ _________ ANTENA FACIL Y EFICIENTE No se ría.......FUNCIONA.

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Vertical Helicoidal para todas las bandas bajas de HF *Apta para Transmisión y Monitoreo *Factible de elaborar con materiales de desecho

-Dos tubos de pvc resistentes, longitud mínima 1,5 mts. ,diámetro aproximado 1 1/2" o inferior. -41 mts. de alambre forrado de 1,5 mm. -42 mts de alambre forrado delgado (cualquier diámetro, entre 1 y 0,5 mm) -Conector, abrazaderas, mástil, etc. ELABORACION * Arrollar los 41 mts de alambre forrado en el caño principal irradiante cuidando que las espiras queden configuradas con un

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espaciado más o menos regular. Soldar en la cúspide a manera de cruz acostada elsombrerocapacitivo,consistente en dos alambres entrecruzados de 1,5 mm de diámetro y de 35 cm de largo c/u. * Arrollar los 21 mts. del alambre forrado delgado en cada uno de los radiales. * Para evitar cambios en las configuraciones de arrollamiento, en ambos casos, fijar los alambres a los tubos con amarras pláticas o con cintas adhesivas. Versión Monobanda Banda 40 mts. Banda 20 mts. Longuitud cable irradiante = 20,8 mts. 10,6 mts. Longitud cable radiales = 11,0 mts. 5,9 mts. AJUSTES Versión Multibanda En este caso será necesario la utilización de

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cualquier tipo de caja auxiliar de sintonización de antena. Para el caso de su uso en la banda de 80 mts y cualquier otra, seguir las intrucciones para la versión monobanda. Versión Monobanda * El largo del cable arrollado en el irradiante deberá corresponder siempre a una longuitud aproximada de un poco más de 1/2 onda. * Para ajustar la R.O.E a valores mínimos se deberá acortar o alargar el tramo superior del cable irradiante (sombrero capacitivo), hasta lograr una lectura adecuada de estacionarias. Optativamente se puede variar el ángulo de caída de los radiales para así cambiar la impedancia. * El largo de cable arrollado en los radiales deberá corresponder a un 7% mayor que un 1/4 de onda, siéndo esta medida nunca crítica.

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Comentarios: Lo Malo : * Estrechez de factor Q * Necesidad de agregarle radiales extras si la se sitúa a menos de 6 metros del suelo. * Recepción de ruido típico de las antenas verticales. * Discretos resultados de 21 a 30 MHz. Lo Bueno: Bajo ángulo de disparo, especial para DX lejanos, (lobulación en "8 gordo"). Tamaño compacto, lo que conlleva una mínima utilización de espacio. Ganancia en decibeles casi equivalente a la de una antena ground plane de 1/4 de onda, lo que hace atractivo su utilización en las bandas bajas.

Antenas para TV Cable - Tv Satelital - Intranet Internet

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Antenas - Radioafición - Cebeísmo - Diexismo PUBLICADO POR RAMON EN 15:00

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ANTENA DE SINTONIA REMOTA

ANTENA DE SINTONIA REMOTA ANTENA PARA 160 Y 80 MTS

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TO CONSTRUCT THE 160M LOOP YOU'LL NEED 20FT ON RG-59. FOLD THE RG-59 IN HALF. ON THE 160M LOOP, IT WOULD BE ABOUT 10FT FROM THE END. ON THE 80M LOOP, IT WOULD BE ABOUT 5 FT. FROM

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THE END. YOU THEN MARK THE CENTER, THEN MEASURE 1/2 AN INCH ON BOTH SIDES. STRIP AWAY THE OUTER CABLE, THE BRAID, AND THEN THE FOIL COVERING THE CENTER CONDUCTOR INSULATION. I THEN USUALLY USE HEAT STRINK TO WEATHERPROOF WHAT I'VE CUT AWAY.THEN CUT SOME SCHEDULE 40 ONE INCH PVC PIPE INTO 3 LENGTHS. EACH SHOULD BE 45 INCHES LONG. CUT ONE TO 56 INCHES. THAT ONE WILL BE THE MAST.ASSEMBLE THE LENGTHS YOU CUT INTO A "T" CONFIGURATION. MEASURE FROM THE CENTER 43 1/4 INCHES ON THE THREE 45INCH LENGTHS. DRILL A HOLE LARGE ENOUGH TO PASS THROUGH THE RG-59. FOR THE 80M LOOP. DRILL THREE HOLES 20 1/2 INCHES MEASURED FROM THE CENTER OF THE "T". LOOP THE 20FT RG-59 THROUGH THE HOLES DRILLED AT 43 1/4 INCHES, THEN LOOP THE 10FT LENGTH THROUGH THE HOLES DRILLED AT 20 1/2 INCHES. INSTALL THE MALE TYPE "F" AND WEATHER BOOTS ON THE RG-59 YOU JUST LOOPED THROUGH THE "T". ATTACH THE 20FT CABLE TO THE 160M MATCHING BOX. ALSO DO THE SAME WITH THE 80M BOX. I FIND IT EASIER TO AIM THE 160M BOX WITH THE SO-239 DOWN. AND THE 80M BOX WITH THE SO-239 UP. THAT WAY THE IT WILL KEEP THE HARNESS SHORT. DRILL THE

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MOUNTING HOLES THROUGH THE BOX, ONCE YOU PULL THE LOOP TIGHT.TO TUNE THE LOOPS, ATTACH EACH LOOP SEPARATELY TO YOUR TRANSCEIVER. DO NOT APPLY RF TO THE LOOP. THIS WILL DAMAGE THE COMPONENTS, AND PROBABLY YOUR TRANSCEIVER. PLACE THE DIAL OF YOUR TRANSCEIVER TO THE PART OF THE BAND YOU WANT TO USE THE LOOP ON. THEN ADJUST THE THE TRIMMER CAPACITOR FOR MAXIMUM NOISE. DO THIS FOR BOTH LOOPS. THEN ATTACH THE HARNESS. THE LOOPS SHOULD BE READY FOR USE. I USUALLY WEATHERPROOF THE BOXES AND FRAME. AND I ADD A WOOD DOWLING TO STRENGTHEN THE MAST. INDUCTORES O BOBINAS DE CARGA PARA ACORTAR ANTENAS

INDUCTORES O BOBINAS DE CARGA PARA ACORTAR ANTENAS CUANDO EL FLUJO DE LA CORRIENTE VARÍA, EL CAMBIO RESULTANTE EN EL CAMPO MAGNÉTICO ALREDEDOR DE UNA BOBINA INDUCE UNA TENSIÓN SOBRE ESTA QUE SE OPONE A LA TENSIÓN DE ALIMENTACIÓN, POR LO QUE MANIFIESTA UNA PROPIEDAD DE AUTOINDUCTANCIA. LA CANTIDAD DE AUTOINDUCTANCIA, DEPENDE DEL NÚMERO DE VUELTAS DEL ENROLLADO, DEL DIÁMETRO DE LA BOBINA, LA FORMA DEL ENROLLADO, EL TIPO DE NÚCLEO COMPUESTO DE

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SUBSTANCIAS MAGNÉTICAS O SIMPLEMENTE EL AIRE. PARA EL CASO DE LA BANDA DE TRANSMISIÓN QUE DA COMO RESULTADO UNA ANTENA DEMASIADO LARGA (40 Y 80 METROS), ES POSIBLE ACORTAR LA MEDIDA FÍSICA DE SU LARGO, A TRAVÉS DEL USO DE INDUCTORES O BOBINAS Y CON ELLO PARA LOGRAR LA RESONANCIA. LA PROPIEDAD ANTERIOR, SE LOGRA ESO SI, SACRIFICANDO EL ANCHO DE BANDA DE LA ANTENA. AUNQUE ÉSTA NO SEA TAN EFECTIVA EN TÉRMINOS DE GANANCIA, TIENE LA GRAN VENTAJA DE OCUPAR MENOS ESPACIOS Y PARA EL CASO DE LOS ARREGLOS DIRECCIONALES DE DOS Y TRES ELEMENTOS BAJA SU RESISTENCIA AL VIENTO, SU RADIO DE GIRO, ETC. ANTENA TAK-TENNA

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REUS MAPA

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VER MAPA MรS GRANDE

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2.5

SWR

2 1.5 1 0.5 0 26.8

27

27.2

27.4

27.6

27.8

Resonant Frequency chosen at 27.15 MHz

TAK-tenna 11 Meters

Resonant frequency is chosen by user at time of tuning.

50 Ohm coax direct from rig to antenna.


I purchased the Tak-Tenna for 20 meters. Assembles according to the good instructions in about 1 hour. Tuned it at about 12 feet for 14.280. The first CQ I heard was in Honduras. I answered back and after the second time He acknowledged me with a 5/9! Wow! This Tak20 really works good. I have made many more contacts depending on band conditions. I feel that it outperforms my inverted V and it is so much smaller and less obvious which is good in my neighborhood. For a wire antenna, This thing is great. I also have to add that Steve was a great help, he even helped me over the phone. If you are even thinking about buying one of these I would say buy it, you won’t be disappointed. 73 KE5MBW


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Amateur Radio Station Zone: CQ 14-ITU 37 LOCATOR: IM 99 TL

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La TAK-tenna es un dipolo compacto de media onda con espirales radiales en sus extremos. Existen varios modelos, el modelo probado es de la banda de 40 metros. Vamos a ver su montaje:

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Aquí vemos las piezas de la TAK-tenna y las instrucciones de montaje, tal como recibimos el paquete.

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Detalle de algunos de los elementos.

Introducimos las barras cortas que sujetarán las espirales, en el boom, con bridas para que no se muevan.

Una vez montadas las barras, las pintamos de blanco para que la antena quede más vistosa.

Procedemos a montar uno de los alambres en una de las cruces, dibujando una espiral, y lo sujetamos con bridas.

Hacemos lo mismo en el otro lado, pero en sentido contrario, y el resultado es el que vemos en la imagen.

Conectamos el hilo de alimentación coaxial al boom (cortamos el hilo por la mitad, y a cada mitad le ponemos en un extremo un borne de contacto y en el otro una pinza de cocodrilo).

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Una vez conectado vivo y masa a uno de los espirales, procedemos en primera instancia a hacer el ajuste de la frecuencia tomando como referencia el ajuste que nos viene en las instrucciones. Según nos indica el fabricante la espiral que va alimentada por el vivo del coaxial, nos da la frecuencia y la espiral que va conectada a la malla del coaxial, regula las estacionarias. Y este es el resultado final. ¡A disfrutar! Op. Alfonso Martí P.O. BOX: 9038 CP: 46080 Valencia (Spain) - QSL via direct or bureau

Conectamos el cable al lado derecho.

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Conectamos el cable al lado izquierdo. Es conveniente hacer ajustes de sintonía para comprobar el funcionamiento antes de la instalación definitiva.

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Thread: Bill's- HomeBrewed Pan Cake - 40 Meter TAK-tenna

06-12-2008, 05:15 PM

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KA6KBC

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Bill's- HomeBrewed Pan Cake - 40 Meter TAK-tenna

So I've been reading about this Small Space antenna that is being sold as the TAK-Tenna. Really neat idea - Has a 30 inch boom and Spiral Coils on the ends. See a picture at http://www.taktenna.com/ Looks easy to build - Right ? So I Built my version out of wood - Mine is very ugly as compared to the store bought one. Materials: Parts: • 3 - Wooden sections - 1 1/2 in X 1/2 in X 8 ft - Cost 92 Cents each - Home Depot • 1 - 100' Spool of Steel Guide/fence Wire - Cost - $7 - Home Depot • 1 - 25 foot RG8 coax with PL259 - Radio Shack - Close Out - $5 • 2 Packages - Nuts/Bolts - $2 - Home Depot • Total Material Cost: $16.76 The commercial version uses PVC and tie wraps, which would have been much easier. Fab Time for my version was about 4 hours - Drilling Lots of Holes and feeding the wire in to make the Spiral Coils was most of the work. However - Test wise it isn't bad I got it tuned up on 40 meters at about 8 feet off the ground and it has an SWR 1:2 to 1:5 from 7.30 to 7.175 MHZ. Also does ok on 15 meter - Tune up wise. Bad news the performance is not Great - Signal pick up is several S units below my Dipole, but it does work. From what I have read the Antenna has problems in that most of the performance is based on feedline radiation (See the links below). http://lists.contesting.com/archives.../msg00339.html http://groups.google.ie/group/rec.ra...7fb7a34305cf3e I'm still testing and will upload a picture of my ugly version at some point It was an interesting experiment and the Antenna fits into a small space 24 inch X 30 inch. Hey it works. If you have no space it might be worth $20 and a few hours of your time or If you aren't a Homebrewer Buy one.

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If you make your own one point - I needed more wire than the 468/7.2 MHZ = 65 Feet Total or 32.5 Feet per side - I had to add wire after the fact. So I would make it about 33.5 per side. Any thoughts ? - Bill - KA6KBC - 73's Antenna - Pictures: http://www.myhamshack.com/HamShackPi...Antenna_3.aspx http://www.myhamshack.com/HamShackPi...Antenna_1.aspx Last edited by KA6KBC; 06-14-2008 at 03:25 AM. Reason: Added - Links to pictures Reply With Quote

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The TAK-tenna Review -Restricted and Limited Space HF Antennas -...

http://www.hamuniverse.com/taktennareview.html

The TAK-Tenna™ Review A Limited Space HF Antenna Review SEARCH CQ - Calling All Hams! Are You New to HF? Good info for Techs! New Novice, Tech and Tech + Privileges

The TAK-tenna™ by Don Butler, N4UJW Hamuniverse.com (Note: This review was originally done in May, 2007 when the TAK-tenna first came out and has been updated since then)

Why am I doing this review? I don't review antennas! I don't recommend antennas! As you may know, a big percentage of this web site is

About dedicated to building antennas and not buying them, but Hamuniverse sometimes an antenna comes along that is so unique that it Antenna Design deserves my attention.....and yours! Ask Elmer If I normally did antenna reviews then I would probably get About Batteries right into it but a bit of introduction is needed to help you Code Practice understand why I am reviewing the TAK-tenna. Prepare for Computer Help Electronics some reading. What's that? You just want the bottom Emergency Power! line.....BUY IT! FCC Information Ham Hints The Space Problem and Murphy's Law! Humor Ham Radio News! Most of you have heard of "Murphy's Law"...you know...he HF & Shortwave is around when everything goes wrong that can go wrong. License Study Links Many hams just don’t have the space to put up standard Midi Music length HF half wave dipole antennas but would give their Reading Room left arm to operate on the HF bands without being limited in Repeater Basics Repeater Builders one way or another due to space. Many hams are so Info restricted that HF antennas, due to their length on the lower RFI Tips and bands, are almost totally out of the question. In lots of Tricks situations, even a simple half wave dipole on 40 meters just Ham Satellites will not fit.....Murphy's law. Shortwave Listening Yours truly is limited by the lack of natural supports for any SSTV Support The Site kind of antenna due to being on a lot with absolutely no trees! So if an antenna that I have needs support, then I STORE Vhf and Up have to either build it or buy it. Mother Nature has not Contact helped me in any way and the XYL hates guy wires and Site Map “junk metal poles“ all over the place. Privacy Policy Legal Stuff Sign/View Log

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TDK Horn Antenna 1-18GHz Wide band, double-ridged horn High gain, low VSWR, robust design www.tdkrfsolutions.com

Antennas for Orbcomm Low Profile, Small Footprint Combination antennas for Orbcomm www.multiband-antennas.com

KJ7U Screwdriver Antennas 6 through 160 meter mobile antennas High Quality Shorty or Full Size www.kj7u.com

Horn Antenna Expert Standard Gain Horn up to 110GHz Broadband Horn up to 40GHz www.ainfoinc.com

Hams like myself are limited by too many trees, not enough trees, antennas requiring various supports, property lines, overhead power lines, home owners association rules,

20/9/2009 00:25


The TAK-tenna Review -Restricted and Limited Space HF Antennas -...

http://www.hamuniverse.com/taktennareview.html

layout problems with small city lots and on and on. If a ham can be restricted or limited with the antenna system layout for his HF antenna, then Murphy's Law will kick in and see Crucial's that he will remain restricted in some way. I am certain System Scanner finds Murphy has many twins and one of them has probably the right visited you at one time or another in your search for an HF memory! antenna that will fit your space.

Book!

Can you imagine needing about 65 feet horizontal distance to put up a 40 meter horizontal wire dipole or inverted V and all the space you have is just enough BUT.....the neighbor’s fence and that power line is in the way. Murphy just kicked you! So you look around and find another possible location....nope....the top of the house will be too close and there is no way to get around that tree! Murphy.....again! Climb the only available 50 foot tree....what...no safety harness......slingshot practice in the dark.... ....what was that sound.........glass breaking?......Murphy again.....How about that twig of a stick you call a tree......too short....shut up Murphy....what is a ham to do? I get many emails from hams in similar situations wanting suggestions for limited or restricted space antennas for HF operation and in some cases, I have to do research on the web to come up with a good suggestion for a limited space antenna that is workable on HF. Of course, much depends on the particular layout of the QTH. The problem with most HF antenna layouts is the lack of horizontal space and supports and in most cases going up is the only alternative but for one reason or another a vertical is out of the question with all those radials that you just don't have room for....Murphy again.....what is the answer? Well, maybe I have found an easy and inexpensive way to kick Murphy away from your limited "antenna farm" permanently! The TAK-tenna Compact Concept!

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NO....it is not a vertical nor one of those EH antennas!

It is an electrical half-wave dipole believe it or not! I may have found one very usable antenna that should work in most locations unless your QTH is located in the dog house.....but you still may have room! Let me explain! One day while searching the web for unusual antennas, I was introduced to a “new” concept, (to me), an electrical half-wave dipole based on what is called the Petlowany principal of spiraling a 1/4 wave length “pancake” of wire on each end of a greatly reduced boom length yielding an antenna that was very usable as far as size was concerned. What I saw was a 40 meter half wave dipole antenna compressed into such a small size that I thought it should work poorly or not at all. Being the "I want to know" for the sake of knowing person that I am, I had to find out for myself whether this was a bunch of static or not. I set out to experiment with it at 2 meters using this principle and it proved to me that it worked and worked well! This was truly a remarkable principle and I had proved to myself that it worked in such a tiny package! Using the very poorly built wire antenna with junk box engineering and "make do with what you have" ingenuity using this Petlowany principal, gave me an antenna that hit repeaters 60 miles away from inside a single story house over flat terrain! At 2 meters it was made from a broken yard stick as the boom, and a couple of pieces of cardboard, tape and some wire. It was straight out of

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hillbilly junk yard junction....but......this contraption actually worked! I was hitting 2 meter repeaters 60 miles away over flat terrain.......from inside the house! Enter the TAK-tenna Company Now the TAK-tenna company, using principles based on ideas by Petlowany and many others all the way back to the beginning of radio, using some major modifications, lots of engineering, mechanical and technical improvements, has developed a line of patent pending greatly reduced size HF antennas that may put regular length dipoles in their place where they belong....in non-restricted layouts! A 40 meter electrical half wave dipole in a 30 inch space that performs?.......I will have to prove it to myself and you the reader with this review! The TAK-tenna line of antennas are extremely reduced space antennas both horizontally and vertically yet remain electrical half wave dipoles. My idea for this review was to see if they worked as well as I had hoped they would, given the fact that thousands of hams are very limited with room for HF antennas and are constantly looking for better ways to get out a better or any signal on the HF bands while having limited or no space for dipoles. And all for the price of taking the family out to a good meal.....unbelievable! We'll see..... About the TAK-tenna review! "Just to set the record straight, I am in no way affiliated or connected with the TAK-tenna company and owe them nothing in return for this review nor do they owe me anything. I will freely admit that they did supply me with an antenna for my review with no strings attached. No, it is not a tweaked and peaked version or their production model so it will pass my review with flying colors if some of you are skeptical....it is just like the one you would get in the box if you ordered it from TAK-tenna. As a general rule, I do not endorse or do any ham radio related product reviews nor make recommendations. My sole purpose of reviewing this antenna is for the benefit of the viewers and readers of Hamuniverse.com and to satisfy my curiosity about this new antenna to help hams who may be looking for a restricted space HF antenna that will help them get a better signal out on HF when they are limited with space. I happen to enjoy helping other hams with their antenna

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limitations and questions and if I don’t know the answer, I will do my best to find it for you as many of you have found by the emails you have sent me. If my review of this antenna turns out negative...then my advise for what it is worth would be..... don't buy it....but if it turns out positive in my opinion, then it would be well worth your consideration for a limited space hf antenna. This review for the TAK-tenna may help you decide to try it....or not. It makes no difference to me but I do know that this "type" of antenna......WORKS and the principles behind it are sound and repeatable.....but a paper clip will radiate rf too....to some extent! Let’s see how this limited space antenna compares to a paper clip or wet noodle and my center fed multiband doublet and a ground mounted vertical that are not restricted....except by the XYL!.......but wait......that's not a fair comparison...or is it?N4UJW" Background of the TAK-tenna company The TAK-tenna antenna design is the brain child of Stephen Tetorka, WA2TAK, U.S.A. The company name, TAK-tenna, LLC, was derived from part of his call sign. "Steve, WA2TAK, has a Master's in Engineering...spent 25+ years in Engineering/Manufacturing...including several years with NASA. There's a 30% chance you are within an arms distance from one of his products -he co-developed the special wire used to make the motor winding for Seagate Technology's hard disk drive that might be in the computer you are using right now.".....Source QRZ.COM - WA2TAK The TAK-tenna Antenna: This information below with the yellow background was taken directly from their web site and slightly edited for space on this page. None of the content from their web page has been re-worded. All of the pictures of the TAK-tenna below were taken during the tuning and operating phase of this review.

Electrical Half-wave Dipole Antenna Electrical Quarter-wave radiating spiral end elements Rotable Portable Stealth Perfect Backup Antenna Direct feed with 50 ohm coax on resonant band Can use coax + tuner...or twin lead + tuner - FB

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Power tested to 1000 CW watts, key down for 30 seconds and 1400 Watts PEP...all FB. NO lossy matching components anyplace in system 10 to 14 dB signal increase in transmit with 90 degree rotation 30 inch boom Low SWR across band Sturdy and well built Weighs only 5 pounds Uses proprietary #14 gauge copper plated alloy wire Easy assembly about 45 minutes

(TAK-tenna during tuning phase for this review)

Tested, Proven and Endorsed by Collins Radio Association TAK-tenna LLC, 154 Lexington Avenue, Fair Haven, New Jersey 07704 Telephone 732-530-8530 WA2TAK..( enter call sign on www.QRZ.com )....Email-stephentetorka@cs.com

Original Tak-tenna ad back in May, 2007 (Edited for space on this page) The TAK-tennas are available in 3 models - 40, 20, and 10 meters. The 40 meter model can be used on 40, 30, 20, 15, and 10

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meters with a tuner. Quoted from Steve Tetorka, WA2TAK - TAK-tenna"If we have made a small contribution, it is because we stand on the shoulders of those who preceded us"......"spiral antennas goes back to early 1900's...the 'spider' which generally sat on top of the wood cabinet of those TRF AM broadcast radios......"

THE REVIEW The model we evaluate is the 40 meter model due to the fact that it can be fed with either 50 ohm coax, for single band operation or you can use it with twinlead or coax and a tuner for the additional bands of 30, 20, 15, and 10 meters for a total of 5 HF bands. It comes in kit form as do the other models and at the present time, according to TAK-tenna, is the most popular because of this feature. Other models are in the research stage. 80 meters and others?......could be! My evaluation for this review will be based on a scale of 5 for each criteria with 5 being a perfect score for each criteria and I have attempted to choose the most important criteria that most hams will be looking for and also added a couple of my own so this review scoring system may not be what you were expecting and is the result of my opinion and my opinion only.

Now that you have been introduced to the TAK-tenna, let's get on with the review!

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40 Meter Tak-tenna reviewed 11 feet off the ground! (There will be a total of 20 review criteria listed below for a maximum possible point score of 100. You will see my comments after the score for each of the criteria and note that this review in no way is to be considered a computer model simulation or results from an antenna test range....this review is just my observations, and end user thoughts and comments from a regular ham like yourself.) I have attempted to do this review with the ham in mind that has limited space for HF antennas!

THE SCORES! 1. The most important criteria of my review will be the on the air performance! (5) If I could give it a 10, I would! I can confirm that I had so much fun with this antenna on the air that I almost forgot about doing this review! It is a remarkable antenna for it's size! Nearly all of the contacts I

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made were 5 9 reports during less than favorable band conditions using an old Yaesu FT 107, 100 watts, SSB on 40, 20, and 17 meters...Yes 17 meters too! Cuba was loud and clear giving me a 59 report....and the TAK-tenna was only 11 feet off the ground during all of the on the air testing. I can not stress enough the fun I had reviewing this antenna on the air! And as an added note, no one on the other side of any conversation over the air knew what antenna I was running. I only said that I was using a 40 meter dipole up 11 feet and the QTH was Texas, near Dallas. Other considerations: 2. Clear and easy to understand instructions? (4.5) I followed the instructions exactly as written in the manual in the order that they were written and did not jump around between steps. The instruction manual contains good quality pictures and drawings that are very helpful but some of you less experienced builders may like to see a drawing of the completed antenna with part descripions, and their locations with reference numbers....especially concerning the way the support tubes attach to the boom with nylon ties as noted below. Even one drawing or picture of the support tube/boom junction point would have been helpful to some builders. Most of the instructions were very clear indeed, however when attaching the supports to the boom, I did notice that there were holes drilled in the center of each support arm when I took them out of the box. There was no mention of why they were there in the instructions. With a bit of further investigation and logic, I determined that they are there so you can use them to feed the nylon ties into the holes and around the boom so the support arms can be securely attached to the boom. The support arms are not bolted to the boom but using the nylon ties in the proper manner makes for a very sturdy setup! One other very minor thing, (to me), was the fact that you are instructed to cut a 26 inch length of wire from the supplied length in the kit to use as a connecting wire from one side of the feed connection to one of the spirals, with no mention about the left over wire or where it goes. Very shortly, using simple logic, there is only one option. It has to go to the other spiral. This could be slightly confusing to a non-experienced antenna builder. I pretended I was that person! Other than this, instructions were excellent!

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3. Ease of assembly, any missing parts, assembly time required? (4.5) This score should probably be a 5 but due to the fact that it took me about 1 hour and 15 minutes from unpacking to final completion during the assembly portion, I decided that the "about 45 minutes" statement on their web site should be lengthened a bit. UPDATE: The Tak-tenna website now states "Easy assembly - less than 90 minutes" rather than the original "45 minutes" back in May, 2007. I realize that this may be a bit picky but this is the way I see it. Guess this is a play on words on my part and it would all depend on many variables with individual builders. I in no way mean this to be understood as false advertising! I did take my time to "get it right" the first time. I also must admit that the very novel method of attaching each spiral to the support tubing using notches and nylon ties on the tubing is an excellent idea. I am commiting that one to memory for future home brew projects! If I had included just this one simple idea as another review criteria, it would have gotten a 10! Great idea Steve! 4. Any special tools or test equipment required for assembly or tuning? (5) By following the instructions which were well written, all you really need is just a standard HF swr meter and an hf radio capable of 40 meter operation, a tuner if multiband operation is desired, 50 ohm coax or twinlead, measuring tape, screw driver, soldering GUN, solder, wire cutters and a tool to tighten the mast clamp to the mast or your own preferences for tools. The average ham should already have these. 5. Can the TAK-tenna be put on the air with acceptable performance using a tuner without tuning the antenna for lowest swr during the "tuning" portion of the instructions by just following the instructions like some other commercial antennas on the market? (5) You can almost call this antenna PLUG AND PLAY! Winding the spiral coils onto the supports could be a bit tricky for some builders, but the instructions are VERY clear on the procedure. Just take your time. I found this very easy. Simple tips are given in the instruction manual for winding and as I mentioned above, the novel idea of the

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notches in the support arms for the spirals make winding a simple process. By using the "starting tap points" suggested in the instruction manual, the swr was about 2 to 1 using an MFJ 259B antenna analyzer on the 40 meter band down near the lower portion of the band. This swr should pose no problem for a tuner using the initial starting tap points. Please not though that due to your individual construction practices, the initial swr reading may different for you. 6. Any special or unreasonable restrictions on location, mounting or height above ground? (5) SEE UPDATE AS OF 11-30-08 BELOW! I installed it for the original review at 11 feet from the ground exactly at the boom and it tuned as expected using the instructions. Why did I use 11 feet? This is the length of an old CB vertical section I had laying out in my "junk pile" as my XYL calls it, of aluminum tubing. As you builders out there know, we call it "gold". I have not attempted to operate it lower than the 11 feet in the original testing in May, 2007. There are reports that it "works" below this limit and I have confirmed them in the update below! UPDATE (11-30-08) I have confirmed that...the TAK-tenna has been operated as low as 2 feet above ground - on a camera triopod - in vertical propagation orientation...and as low as 5 feet above ground in horiztonal propagation orientation so this would certainly add to it's versatility! 7. How does it perform at extremely reduced heights? (5) I have not personally tried the Tak-tenna at other than 11 feet but according to the many other reports I have read, it performs well down to 2 feet above ground in the vertical orientation. I have not used it at any height below the 11 feet height above ground in the testing. Others have reported good results down to 2 feet as in #6 above. So to be fair with this review, I gave it a 5. 8. Does it require more than one person to assemble and mount? (5) Unless you are severely disabled, you should not have any problem with any part of the assembly or mounting. This antenna is so light, 5lbs, that it is indeed very easy to assemble and get in the air by one person!

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9. Was it easy to tune for lowest SWR? (4.5) I don't know of many, if any, commercial or homebrew antennas that are perfect when it comes to tuning. There is NO cutting or trimming of this antenna required or suggested to get a good low swr. I was able to get it down to about 1.5 to 1 swr by some expected trial and error by following the instructions using the alligator clips supplied for initial tuning of the tap points on each spiral. Don't get discouraged, it is very tunable for low swr on 40 meters! Do not expect low swr on any other band other than the resonant band of 40 meters. Remember, this is an electrical half wave antenna. I did note that the swr was usable on 15 meters as would be expected unless you are a perfectionist. As the manual states, there may be rf on the shield so follow the instructions and suggestions supplied in the manual and don't let this fact worry you....the antenna will perform! 10. Was the SWR low over a good usable range as determined by the MFJ259B as a test meter? (4.5) YES! I suspected at the beginning of the review that after final tuning during the initial setup that the TAK-tenna may be very narrow banded on some bands. However, when using a tuner, and 50 ohm coax feed, at 11 feet off the ground, I found that the usable range on most bands was very adequate without having to retouch the tuner adjustments. 10 meters was a bit tricky with an MFJ 901B tuner, but with some very fine tuning of the controls, it fell right into 1 to 1 swr at 28.400mhz! And for you "Techies" out there, the MFJ 259B showed me a match efficiency of 99% at 7.1668mhz with an swr of 1:1 and at 21.590mhz, 98% with a 1.2 to 1 swr at the shack end of the coax if you put much faith in the very popular MFJ antenna analyzer. 11. Mechanical stability and material quality? (5) EXCELLENT! The TAK-tenna company uses high quality materials throughout. I did not find any problem with the construction quality of anything supplied with it. (The alligator clips supplied for tuning only could be a bit larger for bigger fingers!) There is extra spiral wire included and plenty of black uv type nylon ties. Don't worry if you make a mistake during construction and wonder if you have enough wire and ties to complete the job....you will! You might even have enough of the spiral wire for a 2 meter ground plane or 12 de 19

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vertical dipole! I saved mine for a later date! 12. How the TAK-tenna compares on the air to an 80 meter homebrew multiband center fed doublet dipole fed with TV twinlead using a tuner up about 30 feet set up in a North to South configuration? (5) I could not give this test comparison a fair un-scientific test due to band conditions except on receive, and could not get a steady signal with any antenna I had for a good comparison but one thing I quickly noticed during switching between TAK-tenna and the other dipole I had was the fact that I HEARD no noticeable difference on any band. I found this remarkable compared with about 123 feet of wire up about 30 feet! The on the air tests in #1 above proved to me how well this antenna works for it's size. 13. How does it compare to a ground mounted multiband commercial Hustler 4BTV vertical with no radials and fed with RG58 coax? (5) Again, I HEARD no noticeable difference except that foreign broadcast did seem to be just a bit "louder" on the 4BTV and the S meter confirmed less than 1 S unit difference if you can put much faith in S meters. I am sure that this could be due to the angle of radiation of the vertical being lower than the TAK-tenna, but in any case, 21 feet of commercial antenna compared to 30 inches.....you be the judge! I am even considering using the 4BTV Hustler vertical as an expensive 21 foot mast for mounting the TAK-tenna on top of it in the future!......But then there is Murphy's law and the XYL stepping in....I may have to use some guy ropes! The XYL hates guy ropes and wires! Go away Murphy! 14. If used with a rotor, can it help to "null" out stations in undesired locations? (5) This was a test of the TAK-tenna I conjured up using the characteristics of a "rotatable dipole" compared to the TAK-tenna and is not, in my opinion, a fair test due to the fact that TAK-tenna makes no references to the fact that it can "null" out stations off the side. The TAK-tenna web site states "10 to 14 dB signal increase in transmit with 90 degree rotation". This tells me that if the TAK-tenna is rotated toward a station under controlled conditions, ( a good steady signal), and an S meter reading is taken, then if the TAK-tenna is rotated 90 degrees, the signal should drop about 10 to 14 dB.

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I am putting words into this that TAK-tenna does not state. They make no statements to the effect that this antenna is directional, but in my opinion, if it acts like a dipole that ordinarily has worst performance off the ends, then this, in my opinion, is what we are seeing here. If you look at the design of the TAK-tenna from an angle of 90 degrees to the boom, you see only a very tiny amount of wire "exposed" in the direction of a station 90 degrees off the side vs "looking" at that same station "head on". The TAK-tenna is not a Yagi, and in no way does the company refer to it as such, so don't expect that sort of performance from it! This is a very, very compact electrical half wave length dipole antenna, no more, no less!

15. Cost versus time saved dealing with MURPHY'S LAW? (5) EXCELLENT! If you could build this antenna from "scratch" as a complete home brew project, then I believe Murphy's Law would win! I honestly do not think you would save ANY time nor could you save ANY money by attempting any other method other than ordering one of these antennas from the TAK-tenna company. Just cutting the notches alone for the spiral wire would take a long time plus all the drilling of the other holes required for the boom and spiral supports. For the price of this antenna at the time of this review, how could you loose and still get out a good signal on HF with your limited space? 16. Is the TAK-tenna advertising on their web page misleading in any way in my opinion? (5) Absolutely NOT! I could not find one statement on their site that could be considered in my opinion as misleading in any way. They do not represent this antenna to be a "miracle" antenna in any form. They do not represent the TAK-tenna as bending the laws of Physics or changing them in any way. It is designed mainly to be used in limited space situations for hams who are restricted to little or no HF operation due to lack of adequate antenna space among it's many credits. 17. Was it shipped in an adequate container to prevent shipping damage? (5) YES! The antenna was extremely well packaged in a sturdy 14 de 19

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container and survived the rigors of going through the many hands of Federal Express! 18. If I decide to take it down and use it at another location like camping or field day, will I have problems with the disassembly and reassembly? (4) This may not be a fair test but I threw it in anyway! This model for this review, the 40 meter version, is only about 30 inches by 30 inches assembled and extremely light in weight. In my way of thinking, it could be taken off the mast and just put it in the back seat of most cars. The spiral wires are very stiff but could of course be bent somewhat out of shape with ruff handling. One recommendation I might have would be that if you foresee moving it many times to different locations like camping or field days, would be to simply modify the boom on each side by cutting in the center of each side and adding a coupler of some sort using short bolts thru the boom while keeping the same boom length of 30 inches. Then it should be just a simple matter of taking the antenna apart leaving two "pancake spirals" and the mast portion of the boom left to lay flat. Use your imagination. TAK-tenna makes no references to this one way or the other. 19. If for some reason the antenna breaks at some future time, can I easily repair it myself without having to re-order high priced parts for it? (5) I am going to really stick my neck out here for the TAK-tenna company to chop off and say yes. I did not design the antenna but from outward appearances, there is nothing in it that you could not replace using materials from Home Depot, Lowes, the hardware store, etc to get it back into operation. Hopefully there are no reasons why you could not do this. In my opinion, when antenna companies use special materials, components, parts and pieces for their product with the express purpose of making their products non-repairable except when using only their inflated high priced replacement parts...then they are only in business for one thing...and it is not you and I realize also that with many commercial antennas, there are many machined parts that require special equipment to make....most hams don't have a production line setup. I see nothing in the TAK-tenna that would require more than everyday hand tools to get it back on the air. I do not get the impression about the TAK-tenna company concerning the importance of money over the end user. I believe they are in business for the ham radio operator and not against him. This antenna could easily sell for $100.00 or more and they should sell like hot cakes at that price but 15 de 19

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as of this writing, the TAK-tenna is no where near that price! Sure, they should make a mint with the TAK-tenna.....I wish them all the best! The most fragile part of the TAK-tenna is the spiral wire used on each end. It should not break under normal uses so I really should not call it fragile. This is proprietary #14 gauge copper plated alloy wire and I assume it is made specifically for this antenna. I am sure that if you feel better about replacing anything on the antenna, the company will be happy to help.

20. How did it perform as a multibander? (5) EXCELLENT! This TAK-tenna antenna really shines as a multibander! You will forget how small it is while operating! I can confirm that this antenna should perform well for you on it's advertised bands with a tuner and I found that 40, 30, 20, 17, 15, 12 and 10 meters "tuned" just fine for me giving a bonus of 7 HF bands in such a small space! Your tuner may be different than mine so you may not get this performance...experiment! I used a very basic MFJ 901B tuner during this review and if it will "tune" this antenna with no problems, then your tuner should too. Like I said at the start of this review, I was having so much fun with this antenna that I almost forgot this was a review! I made several contacts on 40, 20, and 17 meters using 100 watts ssb or less with no report less than an S9 or a 59 report under terrible band conditions, summer static and at various times of the day. A Cuban station reported 59 copy on 17 meters. 15, and 10 meters were "dead" during the initial on the air testing. I did not do on the air testing on 30 meters but receive was fine. I see no reason why 30, 15 and 10 meters should not do well with average band conditions and due to the fact that I wanted to get this review out to you as soon as possible is the reason I have not tried it on those bands. Technician class hams should have a ball when 10 meters starts booming and this antenna should get them on the lower CW bands now! This antenna has so many possibilities in my opinion when you are limited for HF antenna space. Although the

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instruction manual plainly states that this antenna is not recommended for use inside....I know the experimenting nature of most hams will win over them and lots of hams will try it in their attics, garage, balcony, etc. The thing that really impressed me about the TAK-tenna is the fact that during all of the fun I had with it on the air, I seemed to forget it was a "tiny" 40 meter antenna not longer than 30 inches! Maybe my review sounds like I am biased......I am! The TAK-tenna has proven itself to me and I believe you will be biased also when it gets you on HF when before, you could not! I did not "review" the antenna for the statements concerning, "Rotable Portable Stealth Perfect Backup Antenna" on their web site because these facts are so obvious due to the shear size...or maybe I should say lack of size for the antenna. This antenna would make a perfect antenna for field day, QRP, camping, backup for your wire antennas and Yagi's, when Mother nature or Murphy's law steps in. I am sure you can think of other ways to use it. Backpacking adventures may be difficult but if you can divise a way to take it completly apart and then re-assemble it out in the field, then I don't see anything stopping you from having a great deal of fun on HF...out in the woods or on top of that mountain!......go for it! QRP anyone?

My overall score?

97! Bottom line and some thoughts....... Would I buy it if I had limited space for an HF antenna? YES, and without any hesitation! (with some final comments added) 97 overall score out of a possible 100... That sounds too good to be true, but that's my opinion! I must admit, Steve Tetorka of TAK-tenna has done a wonderful job in the creation of the TAK-tenna in filling a great gap in available antennas for those of you who are limited with HF antenna space. I had a few doubts concerning the performance of it but the results speak volumes.

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The TAK-tenna Review -Restricted and Limited Space HF Antennas -...

http://www.hamuniverse.com/taktennareview.html

No, it is not a full physical length 40 meter dipole, or Yagi up 100 feet in the air! If it was, it would not be 30 inches long and the TAK-tenna company never states that it will out perform.....ANY....antenna. But I can state that it certainly will get YOU on HF when you could not before! Steve has designed this antenna using the knowledge of an engineer and with the hands on experience of a seasoned ham radio operator while keeping you, the end user, in mind! For those of you who are looking for a way to get on HF and are very limited to space with regular length dipoles or with a limited budget, then how can you go wrong by buying and using this antenna? FOR IT'S SIZE, THIS IS ONE REMARKABLE ANTENNA! I repeat...one remarkable antenna! It is an electrical half wave length dipole, not some shortened version of a mobile whip or vertical, and in my honest opinion, why would you want to put up a commercial built vertical with all those radials for at least 2 to three times the price or more and find that it will not work much or any better than the TAK-tenna? Maybe you will get another 1/2 S unit better signal on a vertical....SO WHAT? You can't hear that small of a change! Do you listen to your S meter or the sound coming out of the speaker! I don't think you will easily beat the on the air performance in such a small space! I don't think you can beat the quality for the price! I don't think you can beat the price compared with the performance! So what is left? Murphy's Law.......he is still figuring out how to interfere with your fun on HF if you use the TAK-tenna...he has a very big, difficult job to do.... maybe he should bring in one of his twins to help him out!" N4UJW HAMUNIVERSE.COM

BUY IT! Was that a recommendation?.YES!....

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20/9/2009 00:25


The TAK-tenna Review -Restricted and Limited Space HF Antennas -...

http://www.hamuniverse.com/taktennareview.html

and I don't recommend antennas! NOW YOU KNOW WHY I REVIEWED THE TAK-tenna and remember....I don't review antennas! More Tak-tenna reviews in progress?? We'll keep you posted!

73 Don Butler, N4UJW Hamuniverse.com Now I'm getting back on HF with the TAK-tenna to have some more fun, I may even try it with QRP!..... Shut up Murphy, go bother someone with a regular size dipole! Where do I get it?

Click this ad. Banner used courtesy of TAK-tenna That's where! Update! See Actual Customer reviews on eham.net Tak -tenna News! Confirmed TransAtlantic AND TransPacific contacts!

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20/9/2009 00:25


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