[RFI] Local 1/3 duty cycle EMI

[David Robbins]

Look for something that turns on and off or changes speed/color/brightness
every 40 to 60 seconds... that strong across several bands it shouldn't be
too far away so go mobile or start walking with a receiver and see what you
find.  Could be anything from a defective street light to an elevator motor
and lots of things in between including fish tank heaters, electric
blankets, neon signs, digital billboards like the ones they use at some road
construction, hvac heaters/coolers, just about anything.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: telnet://k1ttt.net:7373



-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Dan K2YWE
Sent: Tuesday, July 23, 2019 14:59
To: RFI at contesting.com
Subject: [RFI] Local 1/3 duty cycle EMI

Here is a sample of one of the noises that plague me. The video is of 20M,
but It can be heard up through 10m and down to 40m, worst on 20m. It peaks
to the NE (lucky me).  The period varies from 40-60 secs, but the duty cycle
seems to always be 33%.
Any ideas what kind of noisemaker I should be looking for? Is this what
proportional control fan inverters behave like?

https://drive.google.com/open?id=1mYu-dyv0zWAcbn8-UK97j-LN0pJPxG1U

TIA, Dan

Dan Zeitlin - K2YWE
South Shore ARC - K3AU
Annapolis, Maryland
dan z website <http://danzee.org>
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