[RFI] New Noise in XU7 Land

[K1TTT]

The on-off pattern may not really be on and off, it is possible that it just
changes frequency quickly for the 1 second then comes back.  If it is close
and that loud try hunting with a battery powered hf radio.  Its almost
impossible to guess what it might be from a description, or even a
recording, except in some very special cases.  Don't count out anything,
aquarium heaters and water bed heaters both come to mind with an on/off
pattern like that, though it could also be a battery charger, space heater,
or even just a computer power supply where the on/off is caused by a
frequency shift when the line voltage changes.  I have a battery charger
here that shifts frequency like that, every time the rtty ops keyed up it
drags the line voltage down and you can watch the battery charger noise
shift frequency on a wide band monitor scope.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net

-----Original Message-----
From: Peter Pellack [mailto:xu7acy at yahoo.com] 
Sent: Sunday, January 29, 2012 12:04
To: rfi at contesting.com
Subject: [RFI] New Noise in XU7 Land

Trying to identify a new TB noise source.It seems local from the
compound.It's 30 khz wide,sounds like a rapid machine gun,when first heard
it was on for 12 secs.and off for 1 sec.,now it stays on for 4 secs. and off
for 1 sec.It moves very slowly up the band.Not sure how far it goes but the
it begins again around 1.760 khz and begins it creep up the band again.I
hear it in all directions and it obliterates all signals.Peter,XU7ACY
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