Sound interference on TV

corkbuoy

Hi

When my satellite receiver is connected to 12v and I am connected to mains I am getting a buzzing sound on the TV. This stops if I disconnect from mains or run the satellite receiver using the mains adaptor. Any suggestions how to fix this ?

corkbuoy

*Kol*

I would say it is interference from the battery charger. Do you have the receiver connected to the leisure battery? If you are connected up to the mains anyway the easiest solution is to power the receiver from the 220v.

Aidan_M_M

Try turning down the volume fully on the Sat receiver , and then turn up the Tv to compensate , and if that doen't work , turn down the TV , and turn up the Sat receiver . Worked for me , just can't remember which way!

GTE

Chances are the audio cables from the satellite box to the TV arent shielded very well and/or are unbalanced cables.

You could see what effect moving the power source further away from the satellite aerial and TV but it seems like its travelling up the power cables too.

Short of seriously uprating the audio cables or getting a purpose build/customed system there is feck all that can be done about it.

I get similar interference from my laptop when I use the headphones. The goings on of the computer interfere with the audio signal, cant do a thing about it

btw. Im a sound engineer so although there could be a few things at play causing the interference I have an insight into whats up.


Turning up the satellite volume to max would help. There is what's called a noise floor in all audio applications and when you have a source of interference the noise floor goes up, or gets louder so if you can overpower that by making the sat louder that should help the situation.

Aidan_M_M

bbk wrote: »

Turning up the satellite volume to max would help. There is what's called a noise floor in all audio applications and when you have a source of interference the noise floor goes up, or gets louder so if you can overpower that by making the sat louder that should help the situation.

So I was kinda right... even though I hadn't a clue what I was talking about ? Excellent!:D

GTE

Aidan_M_M wrote: »

So I was kinda right... even though I hadn't a clue what I was talking about ? Excellent!:D

I think you deserve a pint my friend haha

Aidan_M_M

bbk wrote: »

I think you deserve a pint my friend haha

Nowt stronger than milk for me .
Glad to be of service , and thanks for explaining the reason behind my guessing.:)

GTE

Aidan_M_M wrote: »

Nowt stronger than milk for me .
Glad to be of service , and thanks for explaining the reason behind my guessing.:)

Actually that would be pretty nice, I have a packet of Foxs Thick Tea biscuits in the cupboard too.

Not a bodder, you can guess in confidence now

GTE

Oh, OP

Check your grounding. I cant believe I forgot about that.
If something isnt properly grounded it can cause extra hum and buzz. Sounds like exactly what would happen with a generator since its not an "ideal" way of powering something when you compare it to mains or something like that, I dont quite know what yer up to

Im off to beddy byes now but Im hoping the following links can make sense to ya.

http://www.caraudio.com/forum/wiring-electrical-installation-help/198477-engine-whine-ground-loop-fixes-take-two.html

http://www.audioholics.com/tweaks/connecting-your-system/ground-loops-eliminating-system-hum-and-buzz

http://www.mp3car.com/vbulletin/car-audio/89290-what-relief-ground-loop-isolator-worked-like-charm.html

paddyp

The regulation of the charging unit is probably woeful, and / or you are probably drawing more current than the charging unit can replace. If its an old unit the electrolytic caps are probably gone bad and were probably underspecced to begin with. A bloody big capacitor should sort out your ripple.

Buford T Justice

What you generally get is your bog standard RCA unbalanced L and R Cables for vehicles. In the satellite, chances are its one of those crappy Scart connections with the cables built into the run of it.

I would recommend double checking the grounding of the charger and other electrical devices, The charger / inverter could well be causing the problem if its not properly grounded. I would also invest in a ground loop isolator. If it is a ground loop, it'll kill it. Link
It'll sit inline with the audio from the satellite to the TV

corkbuoy

Thanks for all the info, i'll try some of these and see how it goes. Some I don't understand (electrolytic caps, capacitor) but the volume may be an easy fix.

corkbuoy