Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz

[Doug Scribner]

10 over 9 in SW New Hampshire @ 1140Z

Doug - K1ZO



----- Original Message ----- 
From: "Tony K1AMF" <k1amf at live.com>
To: "'Doug Grant'" <dougk1dg at gmail.com>; "'Rich C'" 
<rich_k7zv at gphilltop.com>
Cc: "'Ray Benny'" <rayn6vr at cableone.net>; <topband at contesting.com>
Sent: Tuesday, December 09, 2014 6:41 AM
Subject: Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz


> S8-9 near NYC right now 11:40Z...was about 10 over 9 here a half hour ago.
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Doug
> Grant
> Sent: Tuesday, December 9, 2014 6:38 AM
> To: Rich C
> Cc: Ray Benny; topband at contesting.com
> Subject: Re: Topband: Unknown Pulse Signal Wiping out 1900-1925 kHz
>
> 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
>>>>>
>>>>
>>>>
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>>>
>>
>>
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