Mikael, If both link rooms have the same problem, then that narrows it down to a possible datalink cable issue or drivers/receivers in the BM7000 When was the last time it worked correctly ? what has changed to your configuration since it last worked ?

Britops, I think the following is what you are looking for:-

To upgrade a Mark I BeoCom 6000 to a Mark II for the new functions, the PCB needs to be changed, not just the software. So, your options are:- 1) Buy a Mark II version on Ebay 2) Buy a Mark II version from your dealer 3) Get the B&O dealer to upgrade one of your existing phones

David, Given what you have just said, this to me means impedance mis-match, so go for the B&O RF amplifier

Klas, How did you like the big black box it came in, the box must have cost almost as much as many ear pieces from other manufacturers.

Eduard, You have a new PM

I agree with others, you have a faulty BeoCom 4 which is under warranty, so you should get a replacement from your delaer.

David, Whilst link frequency can be a problem with co-channel interference, that does not normally give a grainy picture. Your problem is more likely to be poor coax termination meaning poor 75 ohm impedance matching either due to low quality cable and/or bad plug termination, sharp bends in the coax cable and/or very long runs (greater than 30 metres

Dheraj, I have sent you a PM with a link to the Service Manual on my server

Beo, I understand the symptom you have described, but the reason I asked the two questions before is that there was a software change that effected sound reproduction, so How old is your Beocom 4 ? Have you always had this problem or has it just occurred ?