[RFI] Short wideband noise bursts 3-100+ mhz

Aaron Kreider aaron at campusactivism.org
Tue Sep 24 18:35:07 EDT 2013

I've got very short noise bursts coming from a nearby house.  Unlike my 
other noises (power supplies, general hash) this is the first one that I 
can really narrow down - as I can hear it from 3-110 mhz and it is 
probably coming from one of six houses.  The noise has a range of 
several hundred feet.  On my antenna it is around S5-S7.

It is extremely broadband.  I'm guessing that is has a 100 mhz+ 
bandwidth like a spark gap transmitter.

It is probably audible above 110 mhz, but I cannot hear it in FM mode 
and the air band is the highest band that my scanner can get in AM.

It sounds like a click in AM.  It is on 24 hours.  It is occurs roughly 
every second, but not in a regular pattern (ranges from several per 
second to a gap of 3-5 seconds).

I'm guessing I don't hear it below 3 mhz because other noise dominates 
at those frequencies. However I am surprised that it doesn't come 
through at all around 500 khz which often has a low noise level.  So it 
is possible that the signal is weaker at lower frequencies.

Any ideas what it could be?

For a while I was thinking it could be lightning, but lightning bursts 
are much longer and don't continue into the higher frequencies.


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