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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 -- Home: http://stephan.win31.de/ | Webm.: http://www.i24.com/ PC#6: i440LX, 2xCel300A, 256 MB, 18 GB, ATI AGP 32 MB, 110W This is a SCSI-inside, Legacy-plus, TCPA-free computer ![]() Reply to newsgroup only. |
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