[AMRadio] cyclic noise


james.liles at comcast.net james.liles at comcast.net
Thu Oct 8 18:49:41 EDT 2015


Hi Bernie,

I have a neighbor that had a plasma TV that raised the devil on 40. 
Captured the rubbish with an HP 8568B in max hold mode.  It sweeps from 
7050Kc to 8200Kc.  Found it with a portable shortwave radio.  Bothered me 
for a few years and disappeared when I saw it on the curb.

Kindest regards Jim K9AXN

-----Original Message----- 
From: Bernie Doran
Sent: Thursday, October 08, 2015 5:33 PM
To: AMRadio at mailman.qth.net
Subject: [AMRadio] cyclic noise

I asked a few weeks ago if anyone has noticed the cyclic noise that I am
hearing. It appears to be continuous from about 2MC to above 15 MC

usually runs about 6db increase on 40 and the same on 20, lower on 160
and 80, However sometimes 40 or 20 will be 12 db. Nothing close to me to
do this nearest home is 1/4 mi.  yesterday it stopped at exactly 3:45 PM
EDT.  any day of the week and just about any time. it would take
enormous power to cover this freq range.  The repetition rate seems to
be a bit faster that 1 CPS.  I am suspecting that this is scatter with
occasional sky wave that causes the big increase on  one band.  The only
thing that has this sort of power is HARP and they reportedly do operate
from 2 MC to 18 MC at 350 Meg watts. I saw one report from a ham 5000 mi
away and they pegged his s meter in mid day at about 3.3 MC. I can watch
the s meter slid up and down, background noise here is about S4 on 40
daytime, and turning of the AGC it is easy to hear the rise and fall. I
probably am 6500 mi away from HARP( mid Ohio)  Would be interesting to
look at the actual noise wave form and see if it might have some info in
it. Why do I care?  Simply because it is there, and man made, and I
wonder what it s.

             Bernie W8RPW
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