Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz

[Rich C]

I just did a check with the HI Z 4-8 and it is DUE EAST of here at S8-9
here in Grants Pass Oregon. It drops off each side of due east when I
switch it.

Rich K7ZV

On Mon, December 8, 2014 10:00 pm, Doug Grant wrote:
> 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 at 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 at gmail.com> wrote:
>>
>>>
>>>> From: k1fz at 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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