Interesting news about a mystery radio signal:
"'Intruder Signal' on 40 Meters Remains a Mystery for NowVery interesting. I've had a ham radio since I got my first license at age 11 (KA5YSW is my call sign), but haven't used it much in recent years. I'll have to buy some wire to make a new dipole antenna (my old antenna got blown away by the wind) so that I can hear this signal for myself.
NEWINGTON, CT, Sep 9, 2004--An unidentified signal that's been showing up on the 40-meter phone band on or about 7238 kHz has mystified amateurs in the western US and Canada, where it's been heard frequently for the past few weeks. Although it resembles a steady carrier, a closer inspection suggests that the intruding signal actually is a series of closely spaced signals. Don Moman, VE6JY, in Edmonton, Alberta, says he's been hearing the signal quite loud at his QTH.
"This signal looks a lot more interesting than it would sound--just a broad tone/hum/buzz, depending on where you tune," he said. One spectrogram from VE6JY showed perhaps a half-dozen or more discrete signals. "It's certainly loud enough out here, peaking broadly south-southwest from Edmonton," he said. Moman was using a 5-element Yagi and was hearing the signal at 10 dB over S9.
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A September 9 spectrogram of the 40-meter 'intruder' signal from VE6JY.