One of our local ham club members says that it might be from those new
washing machines.
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Thursday, December 06, 2007 12:42 PM
Subject: Re: [TenTec] 40M Band Sweeps
>> "What sweeping folks might observe on 40m is probably ionosonde
> experiments,
> or other the horizon radar. There used to be an HF facility in Eastern
> Canada that intruded on the ham bands from time to time. And, it might be
> military related, depending on what strength you are receiving."
>
> The sweeps occur every ten minutes or so -- sometimes less and sometimes a
> secondary sweep trails the primary sweep by 1-2 seconds at the same sweep
> rate. Most of the time, signal strength is 20-30 dB over S9 at all times
> of
> the day.
>
> Periodically, I hear it sweep at lower levels. It's most apparent on
> radios
> with continuous sweep displays like the Orion and IC-7800 because the
> signal
> is continuously displayed on the graph during the sweep cycle.
>
> I am listing on my remote station from the office right now and the sweeps
> are occurring at intervals of 1-3 minutes.
>
> Paul, W9AC
>
>
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