Video via nonshielded pair


We have several wired security cameras that are connected to the DVR by simple non-shileded two-wire cable. The cameras give output on BNC connector, to which we attached the two-wire cable. It runs for 400' , then connects to the BNC input of the DVR. It works OK, the picture received on the DVR is great. Now we wanted to also connect several wireless cameras. We purchased wireless system - the camera tramsmits by wireless to wireless hub, which has RCA output. If we connect RCA output directly to the DVR, the picture is OK. But if we try to do the same as with wired cameas, i.e. connect RCA to non-shileded two-wire cable and run it for 200' (or even for 50') to the DVR, the picture becomes almost non-existent.

Why is the difference? Is there a way to deliver the signal from the RCA output of the wireless hub across 400' to the DVR without this loss, same as what works for our wired cameras? That is, without running shielded cable. We tried 2 video aplifiers from RS, did not help.


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Your wired cameras seem to be designed to work over twisted pair and therefore have baluns (BALanced-to-UNbalanced transformers) onboard. The wireless hub must be outputting unbalanced (common mode) signal only and therefore can only send signal over a coaxial cable. What you need is a pair of external baluns like these ones:

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one for each end of the unshielded twisted pair cable.

Good luck!

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