[Spooks] "INTRUDER SIGNAL" ON 40 METERS REMAINS A MYSTERY FOR NOW

[Brooke Clarke]

Hi:

It has the feel of broadband digital data over power lines.

Brooke Clarke, N6GCE

-- 
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blitz wrote:

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> Anyone got any ideas?
>
> ==>"INTRUDER SIGNAL" ON 40 METERS REMAINS A MYSTERY FOR NOW
>
> 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 the signal is 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.
>
> That conforms with observations reported by Bob Gonsett, W6VR, at
> Communications General Corp (CGC). He says engineers at the CGC lab in
> Fallbrook, California took a quick look at the intruder September 6 at
> around 2120 UTC and found "several close-spaced CW carriers--perhaps from
> one specially modulated transmitter, perhaps from transmitters at
> different locations," he reported. CGC reported the signals appeared on
> 7238.063, 7238.150, 7238.237 and 7238.412 kHz, with the 7238.237 kHz
> signal being "the strongest of the group."
>
> While no one's sure what it is, the FCC HF Direction Finding Facility has
> been able to determine that it's coming from somewhere north of Prescott,
> Arizona, and west of Interstate 17. FCC monitoring indicates the 
> "buzz" is
> centered on 7238.1 kHz with a bandwidth of about 1 kHz and spikes spaced
> at about 90 Hz apart.
>
> Reports to the International Amateur Radio Union Region 2 Monitoring
> System indicate the signal has been heard from about 1700 to 2130 UTC,
> although Moman reported hearing it at around 0300 UTC and said the signal
> even went off the air for a few seconds while he was listening to it. 
> Jack
> Roland, KE0VH, in Colorado also heard the signals for a couple of 
> evenings
> this week. "Something is not right there," he remarked.
>
> High Noon Net Manager Bill Savage, N5FLD, in Albuquerque, New Mexico said
> several net participants--in Nebraska, Colorado, Nebraska, Wyoming,
> Minnesota and Arizona--were able to hear the mystery signal.
>
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