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Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz

To: Roger D Johnson <>
Subject: Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz
From: Michael Clarson <>
Date: Tue, 9 Dec 2014 10:35:17 -0500
List-post: <">>
All: Turned on my radio to listen to the ARRL 160, and saw "it". First
thought was "what piece of crap in my house is doing THAT".  But as we now
know, its something big. Since CODAR was suggested, I compared it to CODAR
around 4.8 MHz. Similar, but not the same. BW is similar, but the CODAR I
saw sweeps high to low about once every 1.5 seconds where this sweeps low
to high about 3 times per second. CODAR looks to be one carrier (with some
pulse-ish modulation) while this one looks to be two carriers, one delayed
by a short time interval (maybe 100 ms.) and starting at a slightly (aprox.
200 Hz) higher frequency. Carriers modulated with a fast rise time
waveform, giving us the raspy sound. Hope this info helps us figure out
what this is. 73, Mike, WV2ZOW

On Tue, Dec 9, 2014 at 9:55 AM, Roger D Johnson <> wrote:

> Here is a YouTube video of a CODAR signal. Doesn't sound like what I'm
> hearing
> at all!
> 73, Roger
> _________________
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