[AMRadio] frequency sweeper

Bernie Doran qedconsultants at embarqmail.com
Thu Jan 21 11:08:46 EST 2010

Hi Jim; It does repeat, every ten or fifteen minutes, but I observe the same 
type of signal completely out of the Ham bands. there may be several 
transmitters involved but I have not seen anything to suggest that, I bet 
SWLs would have an idea as they have to have observed it.  I can only watch 
190KC at a time, it starts below where I am watching and moves up in freq, 
disappearing out the high end of the visual range, it is especially obvious 
on a waterfall display as it leaves an angled  smooth trail across the 
display. Bernie----- Original Message ----- 
From: "Jim Tonne" <tonne at comcast.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Thursday, January 21, 2010 10:15 AM
Subject: Re: [AMRadio] frequency sweeper

> Bernie:
> Is it a repetitive thing, sweeping the same range
> over and over?  Or does it sweep just once and
> stop?
> If it is repetitive, sweeping a 100 kHz or so from
> start to finish, at several times per second, I
> have an idea of what it is.
> - Jim W4ENE
>> they appear to
>> e unmodulated and as a wild guess appear to move about  75
>> to 100 KC per
>> econd.   My first guess is that they are some sort of
>> propagation testing
>> canner.
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