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Pennines

TV antenna cable causing hum

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I was fiddling with my cables the other day and suddenly I've been punished with a high pitched buzz/hum. 
After unplugging everything and slowly putting things back together, it doesn't appear the noise is resolving itself.

I've searched a number of older posts and I haven't been able to find a solution to the particular situation I've found myself. 

I've simplified my setup down to the TV, 2 speakers, amp + receiver and have identified the culprit is originating from the TV antenna cable. Everything is also plugged into the one outlet (via powerboard).
The cable is a standard RF antenna cable I've purchased from JB and plugs into the antenna wall socket. 

The noise occurs even when only the amp is turned on (and the receiver and TV remain in standby).
It's an integrated amp and the noise increases in volume by turning the amp volume up. Turning the receiver volume up has no impact beyond the master volume. 
What's also strange is it only affects one of my amps. I have a secondary amp  placed into the same position and with the exact same cables which doesn't generate this noise. 

The noise will immediate cease as soon as either the antenna cable or (either end of) the ARC HDMI is unplugged. 

I've found keeping the amp volume at around 30% makes the background noise barely noticeable, and I just have to turn my receiver volume up much higher to get to my normal listening volume. 
Doing this, constantly removing the TV antenna, or substituting my secondary amp isn't ideal in the longer term.

Before I run out and start purchasing new cables to experiment with, has anyone else experienced this particular issue or have any solutions to preventing the antenna/cable seemingly being behind this noise?
 

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Edited by Pennines

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Easy possible fix is an over cable cable RF ferrite noise suppresser 

 

 

 

 

2283D805-1110-4E31-B598-553B014117A1.jpeg

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Thanks.
I've ordered one online. I'll see how this goes.

Easy possible fix is an over cable cable RF ferrite noise suppresser 
 
 
 
 
2283D805-1110-4E31-B598-553B014117A1.thumb.jpeg.7b85ea8d420126874f8db3356954b342.jpeg

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2 hours ago, Pennines said:

Thanks.
I've ordered one online. I'll see how this goes.

 

I'm afraid I don't think that will solve your problem.  I had a similar problem in a previous house and the way I see it, your TV antennae is itself earthed - so whenever you plug it into the TV ... you get an earth loop - which then causes the spkr noise when the amp is turned on.

 

I fixed my problem by plugging the TV (and the items plugged into it - like a Foxtel box) into an isolating transformer ... not straight into the wall.

 

You're in Melbourne so I could bring over my isotran to test it out, if you find your ferrite noise suppressor doesn't in fact work.

 

Andy

 

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@andyr, interesting.
I really appreciate the offer. I have a friend nearby who has an isolating transformer. I'll see if i can borrow it and see how that goes.

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31 minutes ago, Pennines said:

@andyr, interesting.
I really appreciate the offer. I have a friend nearby who has an isolating transformer. I'll see if i can borrow it and see how that goes.

 

Interested to hear the result, P.  :thumb:

 

Andy

 

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If the TV and AVR have optical output and input respectively, maybe that is another way?

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TV antenna cable should be grounded before entering the house.

this wii solve the problem,you have to call the cable service.

 

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