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The simplest way of solving this problem is to break the video ground
by using an isolation transformer on the incoming cable line, before it
reaches your television or VCR.
If you cannot find a 75Ω-75Ω baluns (isolation) transformer, you can
easily construct one from the adaptors which probably came with your
VCR and television, as shown below.
Ground Isolation Adaptor
p
lace in-line with your cable feed, prior to the system connectio
n
75Ω 300Ω
300Ω 75Ω
The assembly shown above may cause some loss of video signal
strength and/or bandwidth, and should be used only as a temporary
fix. It is useful in determining the cause of some video-related noise
problems, however, and costs only a few dollars. If it seems to correct a
problem, consult with your dealer regarding a long-term solution
which does not degrade video performance.