Re: [ARSCLIST] RF problems - used to be - - Effect of vibrations on audio tape

[David Seubert <seubert@xxxxxxxxxxxxxxxx>]

Wow. Thanks to everybody (Ron, Jim, Jerry, Tom, Mike...) who gave 
suggestions about our RF problem. I should have known there were experts 
in such things on this list.

All equipment in the studio is on balanced AC from an isolation 
transformer, so I assume we have clean power. Don't know anything about 
building ground. Once we put in the isolation transformer (which didn't 
help this but reduced the noise floor in general) I assumed that it was 
induced.

It's a very strange interference that fades in, "wanders" (I can't think 
of how else to describe it) in frequency for a few seconds and then 
fades away again. I'm not good at guessing frequencies, but it's 
somewhere around the "bumble bee" frequency range. I really only notice 
it if there is no signal and the speakers are fairly high. Because it 
was cyclical we thought it was the sweep of the radar. But from what Ron 
said, there are clearly many other possibilities. I could record a bit 
of it next week and post it online if anybody cares to make a diagnosis.

Anybody do consulting and need a vacation in Santa Barbara this winter? 
I've got a spare bedroom.

Lots and lots of leads to check out now...

David Seubert
UCSB