Topband: 160 noise pulses

[W7lr at aol.com]

With the many out there interested in or fighting noise on 160m I'd 
appreciate some feedback on a noise pulse situation here.  It is on 24/7, only on 
certain 160 frequencies, say 1824.6 1812.7 and many more (no special spacing 
pattern).  Also on some bc frequencies and not heard above 3 MHz (or so) or on 
higher frequency ham bands. If the rx gain is such that background noise is s2, the 
pulses peak about s5.
The pulse rate is > 100 per minute, not sure if 120 or not.  Once in a while 
one pulse will drop out maybe every 70 or 80 seconds but again no definite 
period pattern.
It is not a huge problem, but say if you tried to hear 4X4WN on 1824.6 it 
would preclude that. I did work him on 1827.1 on 29 oct before the aurora hit. 
This is like the old adage that you need to define the problem before you can 
solve it.
The noise is directional, somewhat west or northwest from here.  One of my rx 
antennas that picks it up well in those directions is 370 feet long for Asia 
with that end close to a distribution overhead wire powerline, which probably 
makes a good antenna to bring the noise here - but it doesnt sound like 
powerline noise itself. My EWE arrays further from the powerline show about the same 
directivity of the noise.
However could what I see as directivity be misleading since the powerline 
"antenna" could deliver the noise to me from anywhere?  
The Beverage has a W7IUV type isolation transformer and I tried a K6SE coax 
balun but believe the pulses are a radiated signal.  I tried car radios and 
portable battery radios but too much qrn to detect the culprit. Next I'm going to 
put the TS850S in the Bronco and do some driving around.  So maybe the main 
question is what kind of device to look for that would produce such pulses? 
Thanks for putting up with such a long story. Let the good times roll again when 
the aurora goes away and we can
work a bunch of Europeans again.  73 Bob W7LR in MT.