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JSC “RD Alfa mikroelektronikas departaments� Maskavas 240, Riga LV-1063, Latvia Phone:+371 67109 400 Fax: +371 67109 498 www.rdalfa.lv info@rdalfa.lv Chief Designer Aleksander Maiboroda phone: +371 67109 426 alexander.maiboroda@rdalfa.lv

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About the company

Joint Stock Company “RD ALFA Microelectronic Department” is an assignee of the Scientific Research Institute of Micro Devices and “Invertor” plant in Riga, which in due time became part of the industrial corporation “Alfa”. During a period of 60-80 years, these enterprises were the leader in Eastern Europe in the field of analog and analog-to-digital microelectronics. Founded in 1962, these enterprises may factually be considered as the pioneers in this electronic technique. The specialists of the institute and plant have accumulated significant scientific and industrial experience in the analog and analog-to-digital fields of technology (Bi, Bi-FET, complementary Bi, CMOS, and Bi-CMOS), microcircuits, and the design and testing of microcircuits. At present, this scientific and industrial potential has been preserved at “RD Alfa md” in large measure. The company’s quality management system has been certificated on compliance with the demands of ISO 9001:2000 by the firm “SGS Societe de Surveillance SA Systems&Services Certification”, Switzerland. Certificate CH05/0392 was received on May 18th, 2005. The main directions of the company’s activities are the design and full-scale production of high-quality microcircuits for common use and airspace. The company’s production includes: • Operational amplifiers; • Comparators; • Timers; • Analog-digital and digital-analog converters; • Circuits of general application for national economic enterprises; • Video-transmission systems for long distances. Since 2002, our specialists have begun to develop and produce devices for the processing and transmission of video signals at long distances by coaxial cable and twisted pair of wires. Such devices were based on microcircuits of in-house design, which are in full-scale production at “RD ALFA Microelectronic Department”. Our company is at present producing and selling different types of devices. Two sets of devices are well known: “Twist” - for the transmission of video signals by twisted pair of wires at distances up to 900 meters; “Twist - 2” - for the transmission of video signals by twisted pair of wires at distances up to 1800 meters. These produced products are continuously upgraded by adding new and useful functions in the light of the experience of their exploitation by various large customers. Every year the company develops and produces two or three new products in this sphere.

PRODUCTS SELECTOR GUIDE Model

Function

Cable type

TWIST-T

Video transmitter Video receiver

Balanced Twisted Pair Balanced Twisted Pair

7 MHz

Cable Video Isolation Clam equalisation gain output input 9 dB 0 dB

900 meters (1800 meters TWIST-2T)

7 MHz

24 dB

8 dB

TWIST-2T

Video transmitter

Balanced Twisted Pair

1800 meters

7 MHz

48 dB

6 dB

TWIST-4RC

4 channel Balanced video receiver Twisted Pair

900 meters (1800 meters TWIST-2T)

7 MHz

24 dB

8 dB

CAB - 2

Video amplifier

Unbalanced (Coaxial)

500 meters

7 MHz

12 dB

9 dB

CAB - 3

Optical video Unbalanced isolator (Coaxial)

500 meters

10 MHz

12 dB

9 dB

20 meters

7 MHz

900 meters (1800 meters TWIST-2T)

7 MHz

TWIST-R

VIDEONORM - 1 4 channel video signal normalizer TWIST-2NR

Unbalanced (Coaxial)

2 channel Balanced video Twisted Pair receiver joint normalizer

Video transmission distance 900 meters

Frequency bandwidth

0 dB

24 dB

8 dB

Sync Tip

Power supply AC 220 V +/- 15% with SCP OCP AC 220 V +/- 15% with SCP OCP AC 220 V +/- 15% with SCP OCP

Sync Tip

AC 220 V +/- 15% with SCP OCP AC 220 V +/- 15% with SCP OCP

Yes

Sync Tip

AC 220 V +/- 15% with SCP OCP

Keyed Black Level

AC 220 V +/- 15% with SCP OCP

Keyed Black Level

AC 220 V +/- 15% with SCP OCP

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TWIST VIDEO TRANSMISSION and DISTRIBUTION

~220V

Equipment for transmission of video signals through twisted pair of wires at distances up to 900 meters.

Twist-T

Twist-T Twist par video transmmiter

IN

OUT

~220V

“TWIST” SYSTEM

Twist-R Twist par video Receiver

IN

Twist-R

OUT

Camera

The “TWIST” system includes the following equipment:

- “TWIST-T” transmitter, which converts a signal from the source (video camera) into a differential video signal. It is installed on the transmitting end of the video line. - “TWIST-R” receiver, which converts a differential video signal into a standard one. It is installed on the receiving end of the video line. When the “TWIST-T” transmitter on the transmitting end of the video line and the “TWIST-R” receiver on the receiving end of the video line are connected in a series, a black-and-white or color video signal is transmitted through the twisted pair of wires at distances of up to 900 meters.

Design features

Correction of video line length by one switcher with discretion of 100 meters Fixed sync-tip clamping of video signal level Built-in power supply source with electronic protection Case protecting from dust and moisture

The “TWIST- T” transmitter has a coaxial 75 ohm BNC input connector and differential outputs made in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The “TWIST- R” receiver has a differential input for the twisted pairs in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The coaxial 75 ohm BNC output connector is intended for the output of a standard video signal. The transmitter has a converter of a standard video signal into a differential video signal as well as a discrete frequency correction that pre-distorts a differential video signal, thus compensating for high frequency losses in a long line. The transmitter has output protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 24 V or voltage on a linear wire with relation to a common wire up to ±12 V. The receiver has an amplifier – a corrector providing compensation for signal losses in the cable and making correction for signal roll-off at high frequencies (discrete correction of signal frequency characteristics depending on the length of the video line, with accuracy up to 100 meters). The receiver has an input protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 24 V or voltage on a linear wire with relation to a common wire up to ± 12 V. Both devices have a built-in power unit for AC power supply 220 V. The devices are intended for use outdoors (category IP54) and are made exclusively using integral circuits made by RD ALFA md, JSC. They are notable for small power consumption, reliability and simplicity of operation.

Technical Characteristics

“TWIST-T” Parameter Total amplitude of input video signal Resistance for coaxial input Wave resistance of twisted pair of wires Pass – band Input – output transfer rate number Discrete control of amplitude – frequency characteristic (at frequency 7 MHz) Ratio signal/noise Max. useful current of transmitter Supply voltage (AV 50 Hz) Size of transmitter Weight of transmitter Max. distance of transmission

Value 0,7-1,5 V 75 Ohm 100 Ohm 7 MHz 1 0 – 6 - 9 dB 50 dB 30 mA 220-230 V 110 x 60 x 67 mm 100 g. 900 m.

Maximum allowed voltages in video line Differential voltage on signal wires, not more than Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

4

Value 24 V ± 12 V 120 V

“TWIST-R”

Parameter Total amplitude of input video signal Resistance for coaxial output Wave resistance of twisted pair of wires Pass – band Input – output transfer rate (controlled) Range of control of amplitude – frequency characteristic at frequency 5 MHz Increment of control of amplitude – frequency characteristic at frequency 5 MHz Common mode rejection of interference Max. useful current of receiver Supply voltage (AV 50 Hz) Size of receiver Weight of receiver Max. distance of transmission*

Value 0,7-3,0 V 75 Ohm 100 Ohm 7 MHz 0,5-1,5 0 –24 dB 10 40 dB 40 mA 220-230 V 110 x 80 x 40 mm 120 g. 900 m

*Losses in twisted pair at frequency 4 MHz not more than 4.1 dB at 100 m


VIDEO TRANSMISSION and DISTRIBUTION TWIST 2T

Twist-2T

~220V

~220V

“TWIST – 2T” SYSTEM Twist-T Twist par video transmmiter

IN

Twist-R Twist par video Receiver

OUT

IN

Twist-2R

OUT

Equipment for transmission of video signals through twisted pair of wires at distances up to 1800 meters.

1800m Camera

The “TWIST – 2T” system includes the following equipment:

- “TWIST – 2T” transmitter, which converts a signal from the source (video camera) into a differential video signal. It is installed on the transmitting end of the video line. - “TWIST – R” receiver, which converts a differential video signal into a standard one. It is installed on the receiving end of the video line. When the “TWIST – 2T” transmitter on the transmitting end of the video line and the “TWIST – R” receiver on the receiving end of the video line are connected in a series, a black-and-white or color video signal is transmitted through the twisted pair of wires at distances of up to 1800 meters. The “TWIST – 2T” transmitter has a coaxial 75 ohm BNC input connector and differential outputs made in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The “TWIST - R” receiver has a differential input for the twisted pairs in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The coaxial 75 ohm BNC output connector is intended for the output of a standard video signal. The transmitter has a converter of a standard video signal into a differential video signal, and also two channels of discrete frequency correction that pre-distorts a differential video signal, thus compensating for high frequency losses of signal in a long line (discrete pre-distortions of a signal depending on the length of the video line, with accuracy up to 100 meters). The transmitter has output protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 24 V or voltage on a linear wire with relation to a common wire up to ± 12 V. The receiver has an amplifier – a corrector providing compensation for signal losses in the cable and making correction for a signal roll-off at high frequencies (discrete correction of signal frequency characteristics depending on the length of the video line, with accuracy up to 100 meters). The receiver has input protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from the constant differential voltage up to 24 V or the voltage on a linear wire with relation to a common wire up to ± 12 V. Both devices have a built-in power unit for AC power supply 220 V. The devices are intended for use outdoors (category IP54) and are made exclusively using integral circuits of RD ALFA md, JSC. They are notable for small power consumption, reliability and simplicity of operation.

Technical Characteristics

“TWIST-2T’’ Parameter Total amplitude of input video signal Resistance for coaxial input Wave resistance of twisted pair of wires Pass – band Input – output transfer rate (uncontrolled) Range of regulation of differential amplitude – frequency characteristic at frequency 5 MHz Increment of control of amplitude – frequency characteristic at frequency 5 MHz Ratio signal/noise Max. useful current of transmitter Supply voltage (AV 50 Hz) Size of transmitter Weight of transmitter Max. distance of transmission

Value 0,7-3,0 V 75 Ohm 100 Ohm 7 MHz 2 0 – 48 dB 10 50 dB 50 mA 220-230 V 110 x 60 x 67 mm 100 g 1800m

Maximum allowed voltages in video line Differential voltage on signal wires, not more than Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

Value 24 V ± 12 V 120 V

Design features

Correction of video line length with discretion of 100 meters Fixed sync-tip clamping of video signal level Built-in power supply source Case protecting from dust and moisture

“TWIST-R”

Parameter Total amplitude of input video signal Resistance for coaxial output Wave resistance of twisted pair of wires Pass – band Input – output transfer rate (controlled) Range of control of amplitude – frequency characteristic at frequency 5 MHz Increment of control of amplitude – frequency characteristic at frequency 5 MHz Common mode rejection of interference Max. useful current of receiver Supply voltage (AV 50 Hz) Size of receiver Weight of receiver Max. distance of transmission*

Value 0,7-3,0 V 75 Ohm 100 Ohm 7 MHz 0,5-1,5 0 –24 dB 10 40 dB 40 mA 220-230 V 110 x 80 x 40 mm 120 g. 1800 m

*Correction of video line length by one switcher with discretion of 100 meters

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TWIST-4RC VIDEO TRANSMISSION and DISTRIBUTION

“TWIST-4RC”

Receiver – converter with four channels for transmission of video signals through twisted pair of wires

The “TWIST-4RC” receiver with four channels includes:

- Four separate receivers converting differential video signals sent from different video signal transmitters by twisted pair of wires into a standard video signal. It is installed on the receiving end of video lines. During connection of the “TWIST-T” (or “TWIST-2T”) transmitter in a series at the transmitting ends of video lines and connection of the “TWIST-4RT” receiver at the receiving end of four video lines, four black-and-white or color video signals are transmitted through the twisted pair of wires at distances of up to 900 (or 1800) meters.

<1800 m

1

2

3

4

Twist-4RC

Twist-2T

Twist-2T

1

2

3

4

<300 m

Twist-T

Twist-T

<900 m TTP111VT Twist-T

Twist-T

Design features

Four video channels High-quality transmission of video signals through twisted pair of wires at distances up to 900 meters (with the transmitter TWIST-T) High-quality transmission of video signals through twisted pair of wires at distances up to 1800 meters (with the transmitter TWIST-2T) Correction of video line length by one switcher with discretion of 100 meters Built-in power supply source with electronic protection

Twisted pair line

Each of the four “TWIST-4RC” receiver channels has a differential input for the twisted pairs made in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The coaxial 75 ohm BNC output connector is intended for the output of a standard video signal. Each of the four channels of the receiver has an amplifier – corrector, which provides compensation for signal losses in the cable and corrects the signal roll-off at high frequencies (discrete correction of signal frequency characteristics depending on the length of the video line with accuracy up to 100 meters). The receiver has protection of inputs from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms as well as protection from the constant differential voltage up to 24 V or the voltage in a linear wire with relation to a common wire up to ± 12 V. The device has a built-in power unit for AC power supply 220 V. The device is intended for use indoors, and is made completely using integrated circuits of RD ALFA md, JSC. It is notable for small power consumption, reliability and simplicity of operation.

Technical Characteristics “TWIST-4RC” Parameter Number of receivers Total amplitude of input video signal Resistance for coaxial output Wave resistance of twisted pair of wires Pass – band Input – output transfer rate (controlled) Range of control of amplitude – frequency characteristic at frequency 5 MHz Increment of control of amplitude – frequency characteristic at frequency 5 MHz Common mode rejection of interference signal at frequency 5 MHz Max. useful current of receiver Supply voltage (AV 50 Hz) Size of receiver Weight of receiver Max. distance of transmission* * Losses in twisted pair at frequency 4 MHz not more than 4.1 dB at 100 m ** On using transmitters “TWIST-2” Maximum allowed voltages in video line Differential voltage on signal wires, not more than Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

6

balun

Value 24 V ± 12 V 120 V

Value 4 0,7-3,0 75 100 7 0.5-2.0 0 –24 10 40 170 220-230 240x150x45 mm 420 g 900 or 1800 m **


VIDEO TRANSMISSION and DISTRIBUTION CAB-2

The compensatory video amplifier “CAB-2” is intended for use in systems of video monitoring, for compensation of losses and correction of the amplitude-frequency characteristic of a cable coaxial connective line with length of up to 700 meters. The device allows for the correction of frequency distortions and losses in the coaxial cable, providing good matching of sources and receivers of the video signal. The device is recommended to be installed and connected at the end or at the beginning of the video line.

Compensatory video amplifier “CAB-2”

The device performs:

Level control of full video signal in a range of 9 dB. Correction of the amplitude-frequency distortions of the coaxial cable at two bands on 3 and 6 MHz, thus providing the transmission of a video signal through the long coaxial cable maintaining vertical sharpness of no less than 520 lines. Matching of the output resistance of a video signal source with wave impedance of the cable line (= 75 Ohm) which excludes the appearance of the reflected signal. The “CAB-2” device has protection of input and output from impulse pick-ups with the amplitude up to 120 V and width up to 100 ms, as well as protection from dangerous voltage in a linear wire in relation to a common wire up to 24 V. The “CAB-2” device has a built-in power supply source, which supplies power from AC net 220 V.

Design features

High-quality transmission of video signal through coaxial cable at distances up to 700 meters Correction of video line length on two frequencies Adjustment of video signal level Wide band of video signal gain up to 7 MHz

Technical Characteristics “CAB-2” Parameter Input resistance Output resistance

Value 75 Ohm 75 Ohm

Built-in power supply source

Supply voltage (AV)

220 - 230 V

Control of gain ratio in range

0,5...1,5

Control of amplitude-frequency characteristic (at frequency 6 MHz)

10 dB

Case protecting from dust and moisture

Control of amplitude-frequency characteristic (at frequency 3 MHz)

6 dB

Min. width of undistorted video impulse with amplitude 1 V at cable RG – 59U* length 500 meters

100 ns

Gain-bandwidth at 3 dB level at switched-off control of amplitudefrequency characteristic

7 MHz

Maximum allowed voltages in video line Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

Value ± 12 V 120 V

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CAB-3 VIDEO TRANSMISSION and DISTRIBUTION

OPTICAL VIDEO ISOLATOR “CAB-3” Insulating video amplifier with optical isolator “CAB-3”

The high quality “CAB-3” insulating video amplifier with optic isolator is intended for providing full isolation between sources of video signals and receiving gear for a video signal, such as monitors, projectors, and digital displays. “CAB-3” allows for the eliminatiion of well-known problems experienced by the installers of video monitoring systems such as background interference from “ground current loops”, preventing the passage of dangerous constant current and other interferences that degrade the quality of the signal transmitted by video lines. OPTICAL VIDEO ISOLATOR “CAB-3”

~AC 220V

Camera

Design features

Output fully isolated from input

“CAB-3” as an active optic insulating device has high linearity and wide band for the passing video signal in comparison with devices with insulating transformers. The “CAB-3” insulating video amplifier with optic isolator has a coaxial 75 ohm BNC input connector which is isolated from the BNC output connector by optoelectronic transducer on a Hewlett Packard microcircuit with dielectric breakdown voltage > 3000 V. In the output part of the device, the regulation of the video signal amplification and fixed sync-tip clamping of its level are performed and the controlled correction of a video signal is made using the microcircuits of RD ALFA md, JSC. The “CAB-3” amplifier has input and output protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, as well as protection from the constant differential voltage up to 24 V or the voltage in a linear wire with relation to a common wire up to ±12 V. The “CAB-3” amplifier has a built-in power unit for AC power supply 220 V. The amplifier is intended for use indoors (category IP50), and it is notable for small power consumption, reliability and simplicity of operation.

High linear transmission of video signal Wide band of video signal gain up to 10 MHz Fixed sync-tip clamping of video signal level Built-in power supply source

Technical Characteristics “CAB-3” Parameter Input resistance Output resistance Supply voltage (AV) Control of gain ratio in range Control of amplitude – frequency characteristic (at frequency 5 MHz) Min. width of undistorted video impulse with amplitude 1 V at cable RG – 59U* length 500 meters Gain-bandwidth at 3 dB level at switched-off control of amplitude-frequency characteristic Suppression of background interference (50 – 100 Hz) *Losses in cable at frequency 5 MHz – 2.1 dB on 100

Maximum allowed voltages in video line Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

8

Value ± 12 V 120 V

Value 75 Ohm 75 Ohm 220 - 230 V 0,5...2,0 9 dB 100 ns 10 MHz 76 dB


VIDEO TRANSMISSION and DISTRIBUTION VIDEONORM-1

The “VIDEONORM-1” device is intended for the normalization of video signal levels in inputs of the commutation equipment of observation stations. The “VIDEONORM-1” device may solve well-known problems experienced by the installers of video security systems. Video signals from different cameras during their passage through long lines of transmission may be distorted heavily due to losses of constant signal components and the impinging of background interferences on the video signal. It leads to the synchronization skip of pictures in the input of switching facilities (multiplexers, monitors, video recording devices, etc.). Moreover, additional losses of video picture quality may appear in digital recording systems and in devices for data transfer in computer networks due to the non-conditioning of the signal. During the passage of video signals through “VIDEONORM-1” a constant component recovers in the video signal and thus the levels of video signals match with the input dynamic ranges of Analog-Digital Converters (ADC) in the computer circuit boards of video capture and of ADCs in digital video recording systems, so the fixed capture of the initial poor-quality video signal is reached. The fast clamping of the video signal level takes place only during moments of the sync pulses of video signal passages and filters out for video signal background interferences at low frequencies. See Figure 1. “VIDEONORM-1”, together with digital displays, significantly improves the quality of recording pictures due to the normalization of the video signal level and growth of the ratio Signal/Noise at the input of a video recording system. Especially effective application of “VIDEONORM-1” may take place during abrupt changes in observing objects of illumination. Such a situation may take place during changes in the time of day, and also during an abrupt change in the medium brightness of the picture in dome-shaped video cameras. Additionally, this device has an LED indication of the video signal presence in every channel. The video signal passes through “VIDEONORM-1” before it is sent to the computer circuit boards of video capture or to the inputs of digital video recording systems.

Device for video signal conditioning with four channels “VIDEONORM-1”

Fig. 1. Sample of “VIDEONORM-1” operation when transferring the test signal “checkered field”

Incoming bad signal image and oscilogram

Outgoing signal image and oscilogram After VIDEONORM-1 signal conditioning.

Design features

Elimination of background pick-ups Fast clamping of “black” level

Technical Characteristics “VIDEONORM-1” Parameter Input resistance of channel Output resistance of channel Transfer ratio of channel at load 75 Ohm Maximal total amplitude of output voltage of channel Maximal total amplitude of input voltage of channel Pass – band of channel Supply voltage (AV) Useful current Number of channels Clamping ratio – Klock-on = ΔUsync1/ΔUsync2 * Size of distribution amplifier Weight of distribution amplifier

4 video channels

Value 75 Ohm 2000 Ohm 1 2,0 V 2,0 V 7,0 MHz 220 - 230 V 200 mA 4 20 240x160x50 mm 550 g

Indication of video signal presence

Fig. 2.

* See Figure 2.

The “VIDEONORM-1’’ device is intended for indoor use (IP44). It is made completely using the integrated circuits of RD ALFA md, JSC and “National Semiconductor”. It is notable for small power consumption, reliability and simplicity of operation. Maximum allowed voltages in video line Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

Value ± 12 V 120 V

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TWIST-2RN VIDEO TRANSMISSION and DISTRIBUTION

“TWIST-2RN” Receiver converter with two channels for receiving video signals through twisted pair of wires with device for video signal conditioning

The “TWIST-2RN” receiver with two channels includes:

- Two separate receivers converting differential video signals sent from different video signal transmitters through the twisted pair of wires into the standard video signal. It is installed on the receiving end of video lines. During the connection of the “TWIST-T” (or “TWIST-2T”) transmitter in a series at the transmitting ends of the video lines and connection of the “TWIST-4RN” receiver at the receiving end of four video lines, four black-and-white or color video signals are transmitted through the twisted pair of wires at distances of up to 900 (or 1800) meters. Twist-2RN 1

Twist-T

1

2

2

Twist-T

<900 m Twist-T

Twist-T

Design features

Two video channels with fast clamping of “black” level High-quality noise- immune transmission of video signal through twisted pair of wires at distances up to 900 meters Correction of video line length by one switcher with discretion of 100 meters Indication of video signal presence Built-in power supply source with electronic protection

Twisted pair line

Normalized Video

Each of the two channels of the “TWIST-2RN” receiver has a differential input for twisted pairs made in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The coaxial 75 ohm BNC output connector is intended for the output of a standard video signal. Each of the two channels of the receiver has an amplifier-corrector which provides compensation for signal losses in the cable and corrects the signal roll-off at high frequencies (discrete correction of signal frequency characteristics depending on the length of the video line, with accuracy up to 100 meters). The receiver includes the recovery scheme of constant components in the video signal, which works during moments of the passage of line sync pulses and provides for the filtration of low frequency interferences. The receiver has protection of inputs from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms and protection from the constant differential voltage up to 24 V or the voltage in a linear wire with relation to a common wire up to ±12 V. The device has a built-in power unit for AC power supply 220 V. The device is intended for indoor use, and it is made using the integrated circuits of RD ALFA md, JSC and “National Semiconductor’’. It is notable for small power consumption, reliability, and simplicity of operation.

Technical Characteristics “TWIST-2RN” Parameter Number of receivers Total amplitude of input video signal Maximal total amplitude of output video signal Resistance for coaxial output Wave resistance of twisted pair of wires Pass – band Input-output transfer rate (controlled) Range of control of amplitude-frequency characteristic at frequency 5 MHz Increment of control of amplitude-frequency characteristic at frequency 5 MHz Common mode rejection of interference Clamping ratio – Klock-on = ΔUsync1/ΔUsync2 *** Controlled level of video signal clamping Max. useful current of receiver Supply voltage (AV 50 Hz) Size of receiver Weight of receiver Max. distance of transmission * Losses in twisted pair at frequency 4 MHz not more than 4.1 dB on 100 m ** On using transmitters “TWIST-2T” *** See Figure 2 [p. 9] Maximum allowed voltages in video line Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

10

Value ± 12 V 120 V

Value 2 0,7-3,0 V 2,0 V 75 Ohm 100 Ohm 7 MHz 0,5-1,5 0 –24 dB 10 40 dB 20 -1 ÷ +2 V 70 220-230 V 240 x 160 x 50 mm 550 g 900 or 1800 m **


VIDEO MEASUREMENT VMD-1R

Functional application of VMD-1R

The portable diagnostic signal tester VMD-1R is an effective device intended for reducing time spent on the installation of video cameras, checking of video lines, and adjustment of correction equipment and registration of video signals’ which enables testing and finding failures in video surveillance systems without using an oscilloscope.

Operational principle of the signal tester

The signal tester processes the composite video signal, divides it into components, and measures the range of each of them separately indicating the results in volts on the built-in LCD. VMD-1R is able to operate with PAL and NTSC video signals.

Portable signal tester for measuring parameters of composite video signal for video surveillance systems vmd-1r

Measurable parameters

Us – the range of sync pulse in the video signal. Ub – the range of color burst signal for color picture cameras. Umax – the peak rate of luminance signal range. Uavr – average (by half-frame) value of luminance signal range.

Additional functions of VMD-1R:

The numeric value of the measured parameter is indicated on the LCD display along with the concordance of this parameter to the technical standard rate (Us = 314 = nor). The absence of the video signal is indicated as (No Video) on the LCD display. The value of the battery voltage (BAT = 2,72 nor) is indicated on the LCD display when the measuring mode is switched off. The supply of the video signal into the signal tester process is induced by the lightemitting diode Video.

Areas of application of VMD-1R:

Control of the operation course of video cameras; adjustment of the auto-diaphragmatic control system. Measurement of video signal losses in video signal transmission lines and control of operation of video signal transmission and registration equipment. Adjustment of video amplifiers and video signal transmitters through twisted-pair wire. Normalization of video signal in the output of the signal tester for persistent operating of LCD monitors.

Technical Characteristics “vmd-1r” The range of the values of video signal measurable parameters:

Us Ub Umax

(270 mV ≤ norm ≤ 330 mV ) (280 mV ≤ norm ≤ 390 mV ) (670 mV ≤ norm ≤ 770 mV )

Uavr Measuring errors (for the standard PAL): Us and Ub Umax and Uavr Input resistance Output resistance

100 – 600 mV 100 – 600 mV 100 mV – 1,5 V 100 mV – 1,5 V +/- 5 % +/- 10 % 75 Ohm 75 Ohm

Error in clamping level

+/- 50 mV

DC supply voltage

3V

Supply current

150 mA

Dimensions

135 X 70 X 24 mm

Weight

160 g

Battery type

2 AA

Maximal input voltage, not more than

+/- 20 V

Continuous operation time (without charging batteries 2 A 1800 mAH )

not less than 8 h

Design features

Control of the operation course of video cameras, adjustment of the autodiaphragmatic control system. Measurement of video signal losses in video signal transmission lines and control of operation of video signal transmission and registration equipment. Adjustment of video amplifiers and video signal transmitters through twistedpair wire. Normalization of video signal in the output of the signal tester for persistent operating of LCD monitors.

11


TWIST-Auto VIDEO TRANSMISSION and DISTRIBUTION

- Active automatic TWIST-AUTO receiver, which converts a differential video signal into a standard one. It is installed on the receiving end of the video line. - Active TWIST-T transmitter, which converts a signal from the source (video camera) into a differential video signal. It is installed on the transmitting end of the video line. When the TWIST-T transmitter on the transmitting end of the video line and TWIST-AUTO receiver on the receiving end of the video line are connected in series, a high-quality color video signal is transmitted through the twisted pair of wires at distance up to 500 meters. When the passive BALUN type receiver on the transmitting end of the video line and the automatic TWIST-R receiver on the receiving end of the video line are connected in series, a high-quality color video signal is transmitted through the twisted pair of wires at distance up to 300 meters.

~220V

The TWIST system includes the following equipment:

Twist-T

~220V

“TWIST-AUTO” SYSTEM Equipment for transmission of video signals through twisted pair of wires at distances up to 500 meters

Twist-T Twist par video transmmiter

IN

Twist-R Audio

Twist-R Audio

OUT

IN

OUT

Design features

Auto adjustment

High-quality transmission of video signals through twisted pair of wires at distances up to 500 meters Automatic correction of video line lenght for PAL and NTSC video signals Fast clamping of black level Indication of the video signal presence and automation operating Built-in power supply source with electronic protection

Camera The automatic TWIST-AUTO receiver has a differential input for the twisted pairs in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The coaxial 75 ohm BNC output connector is intended for the output of a standard video signal. The automatic receiver has a converter of a differential video signal into a standard one, as well as a system of automatic correction of video line length, pre-distorting PAL or NTSC differential colour video signal in order to compensate high-frequency losses in the long line and the system of automatic adjustment of video signal level. The receiver has indication of video signal presence and automation operating. The receiver has an input protection from impulse pick-ups with the amplitude up to 300 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 50 V or voltage on a linear wire with relation to a common wire up to ± 25 V. The receiver has an input protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 24 V or voltage on a linear wire with relation to a common wire up to ± 12 V. TWIST- T transmitter has a coaxial 75 ohm BNC input connector and differential outputs made in the form of a contact connector with 3 contacts. Two contacts are intended for connecting the twisted pair of wires to different phases, and the third contact is for the net ground wire. The transmitter has a converter of a standard video signal into a differential video signal as well as a discrete frequency correction that pre-distorts a differential video signal thus compensating high frequency loses in a long line. The transmitter has output protection from impulse pick-ups with the amplitude up to 120 V and the pulse width up to 100 ms, and also protection from constant differential voltage up to 24 V or voltage on a linear wire with relation to a common wire up to ±12 V. Both devices have a built-in power unit for AC power supply 220 V. The devices are intended for use outdoors (category IP54) and are made exclusively using integral circuits made by MAXIM and RD ALFA md, JSC. They are notable for small power consumption, reliability and simplicity of operation.

“TWIST-T” Parameter Total amplitude of input video signal Resistance for coaxial input Wave resistance of twisted pair of wires Pass – band Input – output transfer rate number Discrete control of amplitude – frequency characteristic (at frequency 7 MHz) Ratio signal/noise Max. useful current of transmitter Supply voltage (AV 50 Hz) Size of transmitter Weight of transmitter Max. distance of transmission

“TWIST-Auto” Value 0,7-1,5 V 75 Ohm 100 Ohm 7 MHz 1 0 – 6 - 9 dB 50 dB 30 mA 220-230 V 110 x 60 x 67 mm 100 g. 900 m.

Maximum allowed voltages in video line Differential voltage on signal wires, not more than Voltage in signal wire with relation to common wire Amplitude of impulse voltage with width not more than 100 ms

Value 50 V ± 24 V 300 V

Parameter Total amplitude of input video signal Resistance for coaxial input Wave resistance of twisted pair of wires Pass – band Input – output transfer rate (automatically controlled) Range of control of amplitude – frequency characteristic at frequency 4.43 mHz (automatically controlled) Gain adjustment range (automatically controlled) Common-mode signal suppression Max. useful current of receiver Supply voltage (AV 50 Hz) Size of receiver Weight of receiver Max. distance of transmission

Value 0,5-2,5 V 75 Ohm 100 Ohm 7 MHz 1,5 12 dB 9 dB 40 dB 60 mA 220 - 230 V 110 x 80 x 40 mm 120 500 m


RD ALFA Design of video surveillance systems

Sigulda bobsleigh, luge, and skeleton track. Length: 1200m (16 curves), Height difference 120m Construction made by “Verlan Ltd” and “RD ALFA MD JSC”. Video lines use external multi-pair cables; number of video cameras 14. Length of video lines 1200m and 120m. Video transmission equipment system “Twist” + “Videonorm” Function block of video surveillance system Sigulda bobsleigh, luge,and skeleton track. Riga Shipyard Territory area: 1 100 000 m2. Construction was made by “BISS Ltd” and “RD ALFAMD JSC”. Video lines use internal telecommunication network; number of video cameras 16. Length of video lines 2200m and 300m. Video transmission equipment system “Twist” + “Videonorm”.

Contact info JSC “RD Alfa mikroelektronikas departaments” Maskavas 240, Riga LV-1063, Latvia Phone:+371 67109 400 Fax: +371 67109 498 www.rdalfa.lv info@rdalfa.lv Chief Designer Aleksander Maiboroda phone: +371 67109 426 alexander.maiboroda@rdalfa.lv


RD Alfa MD product catalogue