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

To: Ray Benny <>
Subject: Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz
From: Doug Grant <>
Date: Tue, 9 Dec 2014 04:00:52 +0000
List-post: <">>
0350z it is back and loud again (40dB over s9) and has QSB.

This site shows how Codar systems work

the sound clip on that page has audio that is higher-pitched than the
one on 1915 but similar in structure.


Doug K1DG

On Tue, Dec 9, 2014 at 3:44 AM, Ray Benny <> wrote:
> Guys,
> I am hearing something between 1910 and 1925. Its a rapid, raspy, pulse
> tone, but its coming from the SE in Central AZ (SA direction). It is just
> above my noise level, currently S4, so not strong. Do not hear it on my TX
> vertical. Don't know if this could be the noise reported or some local
> garbage in my area.
> Using a HI-Z RX 4 SQ.
> Ray,
> N6VR
> On Mon, Dec 8, 2014 at 7:13 PM, Doug Grant <> wrote:
>> > From:
>> > Monday? 9;45 AM
>> > Unable to hear the 1900-1925 Khz. interfering signal this morning.
>> > Propagation change, or is the signal gone ?
>> > Anyone still hear it?
>> I checked a few times during the day on Monday and did not hear it.
>> At 0200z I checked again and it was there and very loud...40dB over
>> s9. Definitely louder on my NE antenna, but only by 10 dB or so. Maybe
>> it is close enough that it is arriving at a high angle. But 30 seconds
>> after I tuned in, it stopped!
>> The signal characteristics are almost identical to CODAR sea-surface
>> radar. There are three of those installations in Maine and VE1 that
>> are easy to hear on 4.8 MHz. Maybe they are trying smoethign new
>> there. Or maybe is it in TF or even shipboard somewhere  off
>> Newfoundland...the CODAR system uses fairly small antennas and low
>> power, so it is possible.
>> I placed a phone call over the weekend to the Operations Manager for
>> one of the projects using those sites and left a message asking if
>> they had something running at 1.9 MHz, but no answer yet.
>> 73,
>> Doug K1DG
>> Long Island, ME  FN43
>> _________________
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