Cheapo caliber electric blanket maybe?
Gary...wa6fgi
----- Original Message -----
From: K8RI (Roger)
To: rfi@contesting.com
Sent: Tuesday, January 18, 2011 8:28 PM
Subject: [RFI] Pulse noise on 40
The past couple of nights at various times between 10:00PM and 4:00 AM
I've heard a pulse noise that sounds like an electric fence *except* it
is more or less a discrete frequency about 3 to 6 Khz wide. It was
slowly drifting upwards at a rate just fast enough to hear the pitch
change. OTOH it didn't take much over 10-15 seconds for it to move clear
through the receiver bandpass. This was a pulse with a repetition rate
of about 1 Hz on and 1 Hz off. It would come and go abruptly. It might
only be present for a few seconds or a couple of minutes. Signal
strength varied from down in the noise to a max of about S5. There were
extended times (half hour or more) where I didn't hear it at all.
It did not appear to be stable enough to be a regular transmission and
unlike most timed noise sources such as electric blankets, heating pads,
and electric fences it was a discrete signal and not just broadband
noise. It really didn't sound like any over the horizon RADAR I've
heard before. I heard it mainly between 7.170 and 7.190, but I think it
was present over most of the band at one time or another. On several
occasions it sounded like it was turned off in the middle of a pulse.
Any thoughts?
73
Roger (K8RI)
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