The first thing I would try is earthing the aerial - this can give a myriad of odd symptoms.

Hi Peter,

How do I do that?

I recently bought a hi-quality cable (90dB) and picture is perfect..I also have a antenna cable for FM radio in the BS2300, can that also have effect, since its all connected ( speakers on the TV though)

So, how do you I ground the areal? Is there some kind of adapter you can recommend, and in that case, do I need to do it on both the TV and FM antennas?

Thanks!

/Peter

have you tried to reseat the PL cables in the BV? try it while it's on to see if it might be a loose socket in the BV? odd that it happens on the other system as well. might be worth it to re-inspect the cables for a knick in them...

Hi BeoMegaMan,

Yes, That was one of the things i tried initially, thinking it was either the cables or the socket..but its strange it happens on all cables..and even, if not as bad, also on the other system. That made me suspect it could be something with the power or the grounding..

I had a similar strange problem some years ago when connecting a PC with a cable directly to the stereo. I got a humming sound in the speakers.
When I put the PC and the stereo on the same circuit, the problem stopped...thats what makes me think it's something with the power, or the grounding.. 

Any tips on how to make sure the stuff is properly grounded?

/Peter

have you isolated the PL cables away from powercords leading to the BV? does it happen in audio and video mode?

No, I was thinking of how to do that. Since the speaker cables are close to the powercable, 3 scart cables, Aeral and link, all goes down on the back of the TV down into the stand. On the speaker side I use the original rubber thing that separates the power cord and the powerlink cord.

The noise only occurs when touching the powerlink cables in the TV end. It is really hard to separate the cables on the back of the TV since they all are connected almost on the same spot on the back of the TV. I guess if this was a general problem the cables would have been better isolated in the first place or delivered with something that would isolate them, right?

Regarding Audio or Video mode, I am not sure...good point there. The thing is that almost always use Video mode since I more or less always listen to music through my Apple TV. But I will test if I get the same problem using the CD or radio..

Thanks for your help so far!

/Peter

Peter wrote:

I had a similar strange problem some years ago when connecting a PC with a cable directly to the stereo.
I got a humming sound in the speakers.

A clear sign of a "ground loop" >>  PC was connected to the ground/earth via it's power-cable and the music
system was also grounded via the aerial.

Peter wrote:

The first thing I would try is earthing the aerial - this can give a myriad of odd symptoms.

Peter is absolutely right !

A "galvanic insulation/separation" of the aerial cable(s) with proper grounding of aerial system
would avoid many problems.  

Since I don't know your elctrical wiring nor your aerial/cable/Sat distribution, the only solution
will be the assistance of a QUALIFIED technican (beeing able to check both, the electrical as well
as the antenna installation(s) and measure the earthing/grounding, ...)

For a complex installation absolutely not a DIY-Job

Hi Vienna,

You are absolutely right there. I live in a townhouse and we are a 6 houses that share the same central antenna and also internet/IP telephony.
The houses are built back in 1989 and the electronic wiring and such seems to be made in a hurry, and with low quality cables and contacts.
I' ve had technicians at my house several times to fix the signal strenght from the central antenna/internet hub to my house. After a few visits, the signal is now 63 dB and I have a brilliant picture on my BV3-32, AV5 and AV9000. However we never talked about the grounding since I thought that was just an electric issue..

I googled "galvanic isolation" and came up lots of interesting stuff, and I realize its quite common that that the electric ground and the aerial ground must be separated. I found a few "galvanic separation adaptors" online and will buy one to check the result. The cost is less than 13 Euros so that might be a cheap solution to an annoying problem, and I hope it doesn't have any negative effect on the picture quality..

Thanks for all the asisstans, guys! I'll let you know if it solved my problem..

/Peter 

B&O is offering a professional & high quality galvanic separator (wall mountable, with grounding lug)
for approx 35-40 EUR, item #8039004 

If you distribute video sources in standard definition, you might also consider the B&O HF Link-Amplifier
item #1405366, which, by the way, is needed for all recent types of B&O TVs to distribute video sources
connected to your main TV.