DrWhoF
Advanced Member level 1
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How to send video signal from and power to a camera through more than 1000m of cable which looks like coax but with very high attenuation and external armoured steel layer?
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onnect video from any source (video generator, camera, vcr ..) to this cable and observe (connect the other end to video-in of any TV, monitor ..) what is the quality of signal that passes through ..
IanP said:First of all, measure the resistance of the core and the shield to estimate dc-loses in the cable ..
Next, connect video from any source (video generator, camera, vcr ..) to this cable and observe (connect the other end to video-in of any TV, monitor ..) what is the quality of signal that passes through ..
Is the coax electrically isolated from the steel?
Regards,
IanP
DrWhoF said:Thank you very much for this line driver.
I'm going to try it ASAP.
What is the resistance of input VR?
Thanks
The typical output level from cameras is 1Vpp and it they will easily drive any load from ∞ down to 75Ω, or less ..
That was the reason I suggested 1kΩ as the input variable resistor ..I'v seen a minature camera module that could not directly drive a low impedance transmitter input.