[RFI] [Elecraft] Noise, RFI ?

[Dave Hachadorian]

Since the noise extends into the AM broadcast band, you should be 
able to DF it quickly with a portable AM radio with its loopstick 
antenna.  Since the loopstick is bi-directional, you will have to 
DF from two different locations and plot the intersection to 
resolve ambiguity.

Dave Hachadorian, K6LL
Yuma, AZ

-----Original Message----- 
From: Phil Hystad
Sent: Wednesday, February 19, 2014 11:15 AM
To: Elecraft Reflector
Subject: [Elecraft] Noise, RFI ?

Using my K3 I was trying to pick up a ZL2 station (New Zealand) 
around 18.08 MHz this morning (about 9:50 AM PST) when this huge 
noise blanketed everything out.  It was about 30/9 and absolutely 
solid across the spectrum shown on the P3.  Using my KPA500, I 
switched to the 20 meter band -- same noise, same level, same 
broadband impact.

I determined that the noise was from roughly 1400 KHz all the way 
up to 28.05 MHz.  All about 30/9.  About the time that I finished 
checking this full MF/HF spectrum of noise it switched off.

Then, it switched on, and stayed on for about 5 seconds, then off 
again.  I turned on my Icom R75.  The next time the noise came on 
I checked it with the R75 and the same noise, same 30/9 level, 
same broad across the bands.

Obviously man-made or under man control as it switched on and off 
and was on for various periods of time.  This noise seems to be 
close, like generated in the neighborhood someplace.

Anyone have ideas of the cause.  You noise experts (Jim?) should 
have ideas.  I was thinking maybe an arc welding machine but that 
is just a wild guess.  It sure seems to be something that can be 
switched on and off.  It is not periodic in that the on/off 
switching is at varying intervals.  The longest on period is 
about one minute, the shortest on period about 2 seconds.  And, 
it has been quiet for the last 10 minutes or so.

Thanks for your help.

73, phil, K7PEH
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