first of all thanks for your comments and thoughts. I just can repeat it, I love the steadicam forum.
As for my strange problem - Tuomas, I unfortunately couldn't hide it because we were in the process of rigging down the camera for a wired one. And then the focus puller noticed that, when I plugged out my bnc cable , all of a sudden the interferences were gone. With nobody else around I probably would have plugged in directly to the monitor and have said, I did a very complicated repair and now everything is fine ;-)
I used a wireless camcorder from Ikegami (first time for me), had the BFD for focus and my sled is the new carbon sled
from Baer.Bel. I wasn't connected in any kind with the sound department, no microphone on the camera, no sound transmitter attached. Being an antenna with my sled would be kind of logical to me, but this time it seems I had an sled that had become a transmitter. Plus my position in the studio wasn't very close to the sound department.
I'll let you know when I have found out something.
Fly safe and don't 'interfere' ,