[sdiy] 100 MHz EMI, what can it be?

[jhaible]

> > Anyway, I'm a good candidate for a "banana, XLR, telephone plug,
shielded or
> > not shielded, balanced or not balanced measurement comparison".
> > The air is full of RF, the railway will add 16 2/3 Hz power line noise
and
> > magnetic fields to that. Could you ask for more for such a test? ;->

AFAIK railways are an exception to the usual EMI regulations. Whether they
are legal exceptions I don't know. But no one can possibly just close down
the Deutsche Bahn because it violates EMI rules so blatantly.
Imagine the magnetic fields just from getting the current from the
conductors
above the wagons down to the motors. 16 Hz if there wouldn't be any
intermittent
contact. In practice, wide band noise. It's possible that there are fixed
frequencies
for communications, too, but I don't know the details.

JH.