Coaxial visual control what characteristics? Security monitoring what place can beused?

Coaxial visual control what characteristics? Security monitoring what place can beused?

Coaxial visual control method has two kinds:
One is the segmentation using frequency, namely the control signal in different

frequency ranges and the video signal, and then with the video signal are combined

together to transfer
At the site, and then demodulated to distinguish the two; due to the adoption of

frequency division technique, in order to complete segmentation of two different

frequencies, require the use of bandpass filter
Filter, bandpass filter and a low pass filter, low pass filter, this will affect

the transmission of video signals; in addition to the control signal modulation at
Above the video frequency, the higher the frequency, attenuation is larger, so the

transmission distance is limited; the double modulation, the video signal and
The control signal is modulated at different frequency points, and the principle

of cable TV, then in front, back-end demodulator.
Two is the use of video signal VBI transmits the control signal, similar to

teletext transmission; the control signal is directly inserted into the video

signal.
Latent period, blanking period does not display on the monitor, the image display

does not produce interference, does not affect the transmission quality of the

image, video
Weighted signal pre amplifier and receiver signal amplification, transmission

distance can be greatly extended video signal, such as the use of 75-5 video

cable, can.
Video transmission and inversion of control is 2000 meters, 75-7 cable, 75-9 cable

3500 meters 5000 meters; this can save a lot of cost of wiring; basic principles
See the science:
The RS485 signal control room (hard disk recorders, matrix or keyboard) to the

RS485 interface circuit, and then sent to the MCU control system, single chip
The control signals are stored, and eliminating hidden period detection signal,

when the signal is detected, the control signal is inserted into the circuit, the

control signal.
No. the blanking period of the video signal is decoded into, through a video cable

sent to the front camera;
The front camera decoding part detection of control signal blanking period, and

then sent to the RS485 interface circuit, a decoder, PTZ, lens
Control; the whole system adopts transparent transmission mode, the baud rate

1200/2400/4800/9600/19200 optional.
Camera image signals are amplified, sent to the control room through a video

cable, then amplified, high-frequency ascension process, to ensure the

transmission quality.
Coaxial visual control transmission technology can be applied to monitoring point

distance of less than 5000 meters, the construction difficulty, construction cost

than the optical cable transmission, reduce
Many, especially the monitoring point in 1000 meters above, the technology is the

most appropriate.
Technical parameters
The parameter SKT80 SKR80
The power supply voltage DC12V/300mA
The communication rate of 1200/2400/ 4800/9600/19200Baud, a transparent channel
Video output is 1 Vp-p
Video output impedance of 75 ohms (imbalance --
Video input - 1 Vp-p
Video input impedance of 75 ohms (imbalance --
Line composite signal
Transmission of SYV-75-5 ≥ 500 m
The distance SYWV-75-5 ≥ 1000 m
Size 78 x 66 x 27 mm
The suitable temperature -20-55 ° C