In article ,
Lars Janqqvist wrote:
Frightening the yaks, Mark Zenier just had to say:

Yes. My best guess is ultrasonic pest repellers.
....
Oh, I noticed something else with the RFI I'm getting... I was
trying to zero in on a SSB signal, and from the pitch sweep it
sounded like the RFI "carrier" was sweeping up or down the
bands...

Yea, that sounds just like the stuff I'm getting, too. As I understand
it, the pest repellers sweep the frequency up and down to maximize the
irritation. It gets real bad at 12095 kHz where the sweep turns around.

Just FYI, I have a 7600GR with an AN-LP1.

It's a portable, go on a walkabout. If it't the same thing as I'm
hearing, it only goes for a half a block or so, and you'll roughly
able to find where it's strongest. One trick I found using my
FR-200, which doesn't have any sort of signal strenght indicator,
is to tune to relativly stable broadcast signal to set the AGC in
the receiver, and then you can see when the interference gets louder
or softer.

Mark Zenier Washington State resident