First, the transmission principle of twisted pair transmitter
Using twisted pair to transmit video signals, the basic principle is:
1. A typical video signal is an unbalanced video baseband signal that is suitable for transmission over a coaxial cable in an unbalanced transmission mode. The twisted-pair cable is a cable that balances the transmission mode. Because of the balanced transmission and twisted-pair mode, twisted-pair transmission has strong anti-interference ability. Therefore, twisted-pair cables are used to transmit video signals. The video signal must be converted to a balanced signal.
2. Video signals converted to balanced mode can be transmitted directly on the twisted pair and are not easily affected by various interference signals. To the monitoring terminal, since the input ports of most monitoring devices such as video recording and display are unbalanced, the balanced signals transmitted from the twisted pair must be converted into unbalanced signals. That is, using a twisted pair cable instead of a video cable to transmit video signals requires only adding a balun (push terminal) to the front and rear ends of the cable.
3, the simplest converter, in fact, a high magnetic flux, high bandwidth magnetic parallel loop around the magnetic flux coil, which is often referred to as a passive converter. It only plays the role of balanced/unbalanced conversion. It is a passive device, it will not bring new distortion, it will not produce noise, but it will have a certain degree of attenuation of the signal.
4, due to video signal transmission on the twisted pair, the signal attenuation, especially the attenuation of high-frequency components, especially serious, so after the transmission of the balanced video signal after twisted pair, under normal circumstances must be amplified through an amplifier circuit , And for the signal, especially the attenuation of high-frequency signals, to give rise to recovery, and then converted into unbalanced signal, supply to the monitor and other after-class equipment. Usually this amplifier is called twisted-pair receiver and plays the role of amplification and compensation. In general, there are two adjustable potentiometers. Adjust the amplifier's amplification gain and the compensation of high-frequency components according to the actual situation.
Using twisted pair to transmit video signals, the basic principle is:
1. A typical video signal is an unbalanced video baseband signal that is suitable for transmission over a coaxial cable in an unbalanced transmission mode. The twisted-pair cable is a cable that balances the transmission mode. Because of the balanced transmission and twisted-pair mode, twisted-pair transmission has strong anti-interference ability. Therefore, twisted-pair cables are used to transmit video signals. The video signal must be converted to a balanced signal.
2. Video signals converted to balanced mode can be transmitted directly on the twisted pair and are not easily affected by various interference signals. To the monitoring terminal, since the input ports of most monitoring devices such as video recording and display are unbalanced, the balanced signals transmitted from the twisted pair must be converted into unbalanced signals. That is, using a twisted pair cable instead of a video cable to transmit video signals requires only adding a balun (push terminal) to the front and rear ends of the cable.
3, the simplest converter, in fact, a high magnetic flux, high bandwidth magnetic parallel loop around the magnetic flux coil, which is often referred to as a passive converter. It only plays the role of balanced/unbalanced conversion. It is a passive device, it will not bring new distortion, it will not produce noise, but it will have a certain degree of attenuation of the signal.
4, due to video signal transmission on the twisted pair, the signal attenuation, especially the attenuation of high-frequency components, especially serious, so after the transmission of the balanced video signal after twisted pair, under normal circumstances must be amplified through an amplifier circuit , And for the signal, especially the attenuation of high-frequency signals, to give rise to recovery, and then converted into unbalanced signal, supply to the monitor and other after-class equipment. Usually this amplifier is called twisted-pair receiver and plays the role of amplification and compensation. In general, there are two adjustable potentiometers. Adjust the amplifier's amplification gain and the compensation of high-frequency components according to the actual situation.
Street Lighting Pole,12M Street Light Pole,Galvanized Steel Octagonal Street Light Poles,Single Arm Steel Street Light Poles
Yangzhou Langxu Lighting Technology Co., Ltd , https://www.street-lighting.com