The Dawn Soliloquy schrieb:

[An ICF-SW7600G, a cell phone, and ...]
I had the Sony, using a reel antenna deployed within the motel room, and in
the early evening, was listening to my usual stuff, 12.160 and 9.475 or
perhaps even a little later at 3.210 MHz. At times I noticed that the radio
was making a noise similar to the Porpoise (or Dolphin) on the old TV show
"Flipper", but at a slower rate. It was maddening. I never heard it before,
and it came and went. Was it the Sony, not likely? I did try the Alinco on the
same frequencies, and though the radio signal was clearly heard, the noise
wasn't. I tried the Sony without the reel antenna, but with the telescoping
antenna fully deployed, still got the noise. How about the location? Maybe the
motel used some type of electronic device that was causing this sporadic
noise?

Eventually I noticed that the cell phone was causing the noise. It seems that
when the signal would drop out, the phone would search for service, and this
would cause the noise. When I shut the phone off, the noise ceased.

[snip]
Any insight into this? I know that the frequencies involved are extremely
divergent, was it possible that the Sony was experiencing signal injection
into the IF or elsewhere?

If anything, I'd suspect the 1st IF @55.845 MHz - there's certainly not
much room for shielding in this little rx, and a strong signal even at
higher frequencies might creep in there (a cell phone searching for a
transmitter probably switches to full transmission power). Since the
scanner didn't show these noises, it's rather unlikely that the cell
phone itself broadcast on shortwave.

Stephan
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