I have a short wave receiver here and at various places around the band the frizz noise can also be heard, so it has to be rf as well as audio, or is it that the inputs of the amp are in effect detecting the rf?
Where to go next. The place you really need to get to would be on the hdmi cable or inside the TV I guess, which is a Samsung of recent vintage. The problem is how do you stop rf from travelling along earths of audio leads.
On 29/12/2022 10:45, Brian Gaff wrote:
I have a short wave receiver here and at various places around the band >> the
frizz noise can also be heard, so it has to be rf as well as audio, or is >> it
that the inputs of the amp are in effect detecting the rf?
Where to go next. The place you really need to get to would be on the
hdmi
cable or inside the TV I guess, which is a Samsung of recent vintage. The
problem is how do you stop rf from travelling along earths of audio
leads.
Ferrite core clamps?
--
Adrian C
My Samsung TV is fed from the pc via a via to hdmi adaptor, and t the--
hdmi cable to the TV. Works well, but the sound card on the pc is
rubbish for picking up internal computer noise, so I have an external
USB sound device, plugged into a powered hub. Normally this means very
good sound in and out of the pc. However since connecting the TV even
when its in standby, this regular tizzy ticking noise is observable on
most inputs from the stereo. Sometimes if you move the plugs on the hdmi cable the noise is much reduced, which makes me think it is probably
getting in along a ground path of some sort. I've tried all sorts of
ways around this, even unwiring the audio from the TV, which is optical
to analogue, but never made much difference. I have a short wave
receiver here and at various places around the band the frizz noise can
also be heard, so it has to be rf as well as audio, or is it that the
inputs of the amp are in effect detecting the rf? Where to go next. The
place you really need to get to would be on the hdmi cable or inside
the TV I guess, which is a Samsung of recent vintage. The problem is
how do you stop rf from travelling along earths of audio leads.
Brian
Sometimes if you move the plugs on the hdmi cable the noise is much reduced, which makes me think it is probably getting in along a ground path of some sort.
I've tried all sorts of ways around this, even unwiring the audio from the TV, which is optical to analogue, but never made much difference.
Well, I have tried one on the hdmi cable near either end with no effect.--
I think a lot of the issues today is that nothing is ever earthed, or if
it is the actual low impedance earth is miles away. So a mixer in the
system is earthed, so is the computer course, but the TV and most other things like the amp, and other ancillary devices are all two core. Just moving cables about affects the loudness and the only way to fix it is
to unplug the hdmI at either end, or to pull the mains plug on the TV. Neither of which is ideal. Brian
On 29/12/2022 10:45, Brian Gaff wrote:
Sometimes if you move the plugs on the hdmi cable the noise is much
reduced,
which makes me think it is probably getting in along a ground path of
some
sort.
I've tried all sorts of ways around this, even unwiring the audio from >> the
TV, which is optical to analogue, but never made much difference.
The audio input of the USB sound device is where I'd install the ferrites. Wind the cables round the ferrite cores a couple of times.
--
Adrian C
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