"TWIST" twisted pair video transmission system Transmits video signals via twisted pair for up to 900m Start Price USD 125.00 Current Price USD 125.00 Time Left 14 days 1 minutes Bid Count 0 Buy It Now Price - Reserve Price - Start Time Wednesday, October 22, 2008 End Time Tuesday, January 20, 2009 Location Riga, Vidzeme See more about '"TWIST" twisted pair video transmission system ' Description SYSTEM “TWIST”Devices for transmission of video signals over twisted pair  wires for distances up to 900 meters. Transmission of high resolution video signal  over  twisted pair  wires for distances up to 900 meters Adjustment for disdance compensation by one switcher with discretion of 100 meters Fixed sync tip clamp of video signal Built-in block of power supply with electronic protection Case with protection from dust and moisture        System “TWIST” includes the following devices: Transmitter “TWIST-T”, which converts signal from the source (video camera) into differential video signal. It is placed on transmitting end of video line. Receiver “TWIST-R”, which converts differential video signal into standard. It is placed on receiving end of video line. When transmitter “TWIST-T” on transmitting end of video line and receiver “TWIST-R” on receiving end of video line are serially switched on black-white or color video signal is transmitted by twisted pair  wires for distance up to 900 meters. Transmitter “TWIST- T” has coaxial 75 ohm BNC input connector and differential outputs, made in the form of contact connector with 3 contacts. Two contacts are intended for connection twisted pair  wires with different phases, and third contact is for net ground wire. Receiver „TWIST- R” has differential input for twisted pairs in the form of contact connector with 3 contacts. Two contacts are intended for connection twisted pair wires with different phases, and third contact is for net ground wire. Coaxial 75 ohm BNC output connector is intended for output of standard video signal. Transmitter has converter of standard video signal into differential video signal, and also discrete frequency correction pre distorting differential video signal for compensation high frequency loses in long line. Transmitter has output protection from impulse pickups with amplitude till 120 V and pulse width till 100 ms, and protection from constant differential voltage till 24 V or voltage on linear wire with relation to common wire till ±12 V. Receiver has amplifier – corrector providing compensation of signal’s losses in cable and making correction of signal’s roll off at high frequencies (discrete correction of signal’s frequency characteristic depending on video line’s length, with accuracy till 100 meters). Receiver has input protection from impulse pickups with amplitude till 120 V and pulse width till 100 ms, and protection from constant differential voltage till 24 V or voltage on linear wire with relation to common wire till ± 12 V. Both devices have built in power-unit for AC power supply 220 V.Devices are intended for work outdoors (category IP54) and are made exclusively on integral circuits of JSC ”RD ALFA MD ”. They are notable for small power consumption, reliability, simplicity of operation   Technical characteristics “TWIST-T” Parameter Units Value 1 Voltage of input video signal Vpp 0,7-1,5 2 Coaxial input impedance Ohm 75 3 Output  impedance  twisted pair  wires Оhm 100 4 Frequency  bandwidth Hz-МHz 20 - 7 5 Video gain input -  output 1 6 Discrete equalization of amplitude – frequency characteristic at frequency 5 МHz dB 0 – 6 - 9 7 Ratio signal/noise dB 50 8 Supply current of transmitter mА 30 9 Supply voltage (AV 50 Hz) V 220-230 10 Dimensions of transmitter Weight of transmitter mm g 110 Х 60 Х 67 100 11 Recommended  transmission distance* m 900*   “TWIST-R” Parameter Units Value 1 Voltage of input video signal Vpp 0,7-3,0 2 Coaxial input impedance Оhm 75 3 Input impedance  twisted pair  wires Оhm 100 4 Frequency  bandwidth Hz-МHz 20 - 7 5 Video gain input -  output (adjusted) 0,5-2,0 6 Discrete equalization of amplitude – frequency characteristic at frequency 5 МHz dB 0 –24 7 Increment of equalization of amplitude – frequency characteristic at frequency 5 МHz Number 10 8 Common mode rejection dB 46 9 Supply current of receiver mА 40 10 Supply voltage (AV 50 Hz) V 220-230 11 Dimensions of receiver Weight of receiver mm g 110 Х 80 Х 40 120 12 Recommended  transmission distance* m 900* *Losses in twisted pair at frequency 4 MHz not more than 4.1 dB at 100 m   Maximum allowed voltages in video line Units Value 1 Differential voltage on signal wires, not more than Vpp 24 2 Voltage on signal wire with relation to common wire Vpp ± 12 3 Amplitude of impulse voltage with width not more than 100 ms Vpp 120                                                      Advantages of our products: Noise & Cross – Talk Immunity High quality transmission of symmetric video signal overy twisted pair  wires at long distances – from 200 to 2000 meters. Exceptional noise cancellation and cross talk immunity. Video quality is assured even when signals are used in electrical “noisy” environment. Easy Installation, Simple Adjustment All devices have the unique switcher for compensation of line’s length and one variable resistor for gain control. Sync tip clamp option All devices have special circuit design for sync tip clamp option for video signals. Special power supply unit All devices have special power unit, which provides the big dynamic range of video signals. The built in power unit is with electronic protection. Protection from Dangerous Voltage There is protection of valuable video equipment by suppressing external dangerous voltage. Virtually all products offer line-to-line (Differential) and line-to-ground (Common) protection from dangerous voltage. (See table of absolute maximal operating voltage). Compact Packaging Devices are enclosed inside the case with dust and moisture protection. Please not that our devises works only with 220V if you need to operate with device using 110V, please use convertor or before bidding consult us, if it is possible to change power supply for you.If you need more information about over products and over company, please download our catalogue (in pdf format) This document (doc format) will help you to choose correct deviceIf you have any question you are to consult me, by eBay message, email or phone if you have any question. BIPOLAR Ltd. Riga, Latvia, Maskavas-240 tel/ +371 29478837 ( E-mail: levs.lapkis@rdalfa.lv ) All rights reserved. Place a Bid!