Cable related hum

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Hi Harry,
I was talking about any audio or TV tuners. I really do not care what happens to the cable box. You need to break the ground before it hits the first piece of equipment. A 1:1 transformer from a good vendor is the only reasonable way to do this. The cable company may be able to supply this and boost your signal accordingly. Then they are responsible for the quality of signal. It may cost you some money but is worth it.

The hum comes from multiple grounds. Circulating ground currents cause the hum. The earth is used as a return for your electrical power grid and gives rise to potential differentials between ground points. Complete with any waveform distortion. The cable is providing another path for these currents.

-Chris
 
I got the processor. However the box that has the optical
out does not perform as well. It gives occasionally a
high frequncy pop when sh\witching channels. It also
forces my TV to switch input formats. This takes a while
(1-2sc) and is annoying when flipping channels). The digital
input is connected to ground and hums.

So I'm back to floating the power amps. Although they have
been working fine for 7 years I'm still not so happy as they
do have 750V power inside.

Harry
 
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