[RFI] 160 Meter Interference

[Ford Peterson]

Wow!  Now that is one weird noise.  Never heard one like it before.  Are you sure it's not the radio?  Try another radio.  How wide is the bandwidth?  What do you hear on AM.  How about FM?  It almost sounds like my Autek VA1 hi hi.

Whatever it is, the changes in center frequency indicates that it is free-running and not a fixed oscillator.  I suspect it is possible for a tuned circuit inside the radio to be causing the noise.  I hear absolutely NO atmospherics at all.  And from the level of quieting, it is very close.  Have you got a rig in a car or a portable radio?  I would jump in the car and look for the area of greatest intensity.  A ferrite loopstick antenna would work pretty well on those lower frequencies.  You should be able to triangulate the noise using the loopstick from the vehicle.

Good luck.  And report back when you find it.  I've never heard anything like it.  Based on the frequency repetition (90KHz) my guess is that you will find it to be a switching power supply.

Ford-N0FP
ford at cmgate.com


----- Original Message ----- 
From: "Bill Gaines" <gaines at wcoil.com>
To: <rfi at contesting.com>
Sent: Tuesday, October 05, 2004 2:43 PM
Subject: [RFI] 160 Meter Interference


I have a terrible noise on 160 and 80 meters and to a much lesser extent 40. I have eliminated my house as the culprit 
by shutting down the main breaker and operating the radio off battery power. I have also asked my neighbor to do the 
same thing which provided no clue either. This signal is about every 90 KHZ or so. I have recorded it in the CW position
with no filtering. Here is the link to the file. My apologies for it's size but I have never done this before. Let me know if
there is anything else I can provide. By the way...it's the .wav file...the other file is my mug.

Cablevision just left my house and told me in no way was it a result of their equipment. The telephone company is next
then the electric company.

http://www2.wcoil.com/~gaines

Bill AD8P
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