Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz

[Doug Grant]

1136z and it is 40 over 9 here in southern Maine.

It is not far away from here.

On Tue, Dec 9, 2014 at 4:41 AM, Rich C <rich_k7zv at gphilltop.com> wrote:
> 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
>>>>
>>>
>>>
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>>
>
>