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ANTENNAS FOR 100 POUND DXPEDITIONS 8.1.5 Buddipole Horizontal Dipole for 17-meters at 16 feet The Buddipole on 17-meters at 16 feet appears below. Here is the model data for this antenna. EZNEC+ ver. 5.0 Buddipole dipole 17m @16 ft

8/30/2007

10:18:52 AM

--------------- ANTENNA DESCRIPTION --------------Frequency = 18.1 MHz Wire Loss: Aluminum (6061-T6) -- Resistivity = 4E-08 ohm-m, Rel. Perm. = 1 --------------- WIRES --------------No.

End 1 Conn.

1

W2E2

2 3

W1E2

Coord. (in) X

Y

End 2 Z

Coord. (in)

Conn.

X

Dia (in)

Y

Segs

Z

Ins Diel CThk(in)

0,

-22,

192

W3E1

0,

22,

192

0.75

11

1

0

0,

-93,

192

W1E1

0,

-22,

192

0.5

11

1

0

0,

22,

192

0,

73,

192

0.5

11

1

0

Total Segments: 33 -------------- SOURCES -------------No.

Specified Pos. Wire #

1

1

Actual Pos.

% From E1

% From E1

50.00

50.00

Amplitude

Seg

Phase

(V/A)

6

Type

(deg.)

1

0

I

-------------- LOADS (RLC Type) --------------

No.

Specified Pos. Wire #

% From E1

Actual Pos. % From E1

1

1

0.00

4.55

2

1

100.00

95.45

R

Seg

(ohms)

L (uH)

C (pF)

R Freq

Type

(MHz)

1

Open

1.72

1

18.1

Par

11

Open

3.73

1

18.1

Par

No transmission lines specified No transformers specified No L Networks specified Ground type is Real, High-Accuracy --------------- MEDIA --------------No.

Cond.

Diel. Const.

(S/m) 1

0.005

13

Height

R Coord.

(in)

(in)

0

0

The dipole has an extremely low resistance. The Buddipole Triple Ratio Switched Balun (TRSB) provides a switched transformer that matches a 50 ohm feed line to a 25 ohm load, or a 12.5 ohm load. This configuration presents 25 ohms so the 2:1 setting of the TRSB will be employed. This yields the SWR graph as shown below.

95

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Antennas for 100 Pound DXpeditions - volume 1  

Computer-based antenna modeling and direct experience with lightweight portable antenna systems. Volume 1: Selected high band antennas [20-6...

Antennas for 100 Pound DXpeditions - volume 1  

Computer-based antenna modeling and direct experience with lightweight portable antenna systems. Volume 1: Selected high band antennas [20-6...

Profile for ne1rd
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