0350z it is back and loud again (40dB over s9) and has QSB.
This site shows how Codar systems work
http://www.ims.uaf.edu/hfradar/how_it_works/
the sound clip on that page has audio that is higher-pitched than the
one on 1915 but similar in structure.
73,
Doug K1DG
On Tue, Dec 9, 2014 at 3:44 AM, Ray Benny <rayn6vr@cableone.net> 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 <dougk1dg@gmail.com> wrote:
>>
>> > From: k1fz@myfairpoint.net
>>
>> > 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
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>
>
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