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Author Topic: Unknown Pulse Signal Wiping out 1900-1925 kHz  (Read 12059 times)
K4KYV
Member

Posts: 108




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« on: December 07, 2014, 04:51:32 PM »

Who else has been hearing this the past few days? Kind of a pulsating buzzing sound, centred around 1915, but audible down to slightly below 1900 and up to approximately 1925. At its centre frequency last night (Saturday), it was just as strong as any CW contest signal.

It was reported to be particularly loud (S9 + 30) in the Northeast and ops with beverage antennas are saying it appears to be coming over the horizon  in a south easterly direction, while others say it is possibly coming from Europe or Polar Russia. Whether this is a harmonic, a spur or something coming from an intentional radiator, it has made regular QSO operation between 1900 and 1930 almost unbearable for the past three nights now. 

Not that this necessarily has anything to do with the present interference, still this is all the more reason to hope that the FCC eventually goes ahead and adopts their proposed reallocation of 1900-2000 to delete sharing  with radiolocation and to restore amateurs to primary status. Although many 160m ops blew off this NPRM while the comment period was still open as if it were much ado about nothing, a  few of us maintained all along that it was of utmost importance for the amateur community to flood the Commission with comments supporting their proposal.

Although GPS has pretty much killed 160m radiolocation for the  moment, we never know when some new service might attempt to start up in this part of the spectrum under the guise of Radiolocation.  That could be what's happening right now. Even those only interested in DX and contesting in the bottom end of the band and who sometimes appear not to even consider 1900-2000 as part of the band, still must remember that if some new service were to displace amateurs from the top half, congestion in the 1800-1900 kHz segment (including the DX window) would likely become unbearable. The FCC proposal, if adopted, would protect amateur status in the entire 160m band once and for all, and let's hope it is not already too late.
           
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WB4BYQ
Member

Posts: 184




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« Reply #1 on: December 07, 2014, 06:27:51 PM »

Have the noise here in Opelika, Alabama Sunday night at s4 on the Kenwood.

richard
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VE3KJX
Member

Posts: 11




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« Reply #2 on: December 08, 2014, 10:38:32 AM »

I follow a vintage gear reflector, and so far:

Amherst WI hears it, says source is east of him.
someone in N Illinois hears it,
and Michigan, Wisconsin and Tennessee.

if that's helpful. I'll be checking tonight in Ontario.
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N3QE
Member

Posts: 4943




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« Reply #3 on: December 08, 2014, 11:48:48 AM »

I am in grid FM19ka. The intruder is coming from the east or northeast of me. There is a 120Hz substructure, a 4Hz rep rate to the 120Hz substructure, and over and above that it's like two waves are beating against each other at a sub-Hz rate.

Sound sample (recorded with 2400Hz bandwidth) at http://www.trailing-edge.com/1910-intruder.wav

Pics of waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png

Tim N3QE

P.S. My review of the sound sample "It's got a good beat and you can dance to it". Apologies to all the kids ever on Dave Clark's show :-)
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KA1GJU
Member

Posts: 6




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« Reply #4 on: December 08, 2014, 04:28:36 PM »

FWIW:
Same signal (I believe) is on 5.300 Mhz +/-.
Looks and sounds the same up here in NH.

Just swept the 160M thru 17M bands, found it on 3.250Mhz also.

Kriss KA1GJU
« Last Edit: December 08, 2014, 04:54:03 PM by KA1GJU » Logged
VE3TMT
Member

Posts: 878




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« Reply #5 on: December 08, 2014, 08:49:26 PM »

I'm hearing it quite strong here in Kingston Ontario, FN14rf. S-9 peaking 10 over. My ANC-4 will take it down to an S-4.
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KD8ZUV
Member

Posts: 4




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« Reply #6 on: December 17, 2014, 07:57:38 AM »

I think this is the same signal you are talking about... This comes from the UDXF mail list.

"It is a high-frequency surface-wave radar (HFSWR) system, developed
by Raytheon Canada for the Canadian military. It seems to be a new
version of the SWR503 MK2 HFSWR system. It is intended to detect ships
up to 200 miles from a country's coast (EEZ) to protect against
terrorists, smugglers, and unauthorized fishing vessels as well as
locate vessels in distress. The present system has been detected at
1915, 3250, 4400, and 5300 kHz.

- It is located at Hartlen Point, NS, near Halifax
(point Google Earth to 44 35 29.47 N 63 26 49.68 W )"
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VE3TMT
Member

Posts: 878




Ignore
« Reply #7 on: December 17, 2014, 08:00:27 AM »

I think this is the same signal you are talking about... This comes from the UDXF mail list.

"It is a high-frequency surface-wave radar (HFSWR) system, developed
by Raytheon Canada for the Canadian military. It seems to be a new
version of the SWR503 MK2 HFSWR system. It is intended to detect ships
up to 200 miles from a country's coast (EEZ) to protect against
terrorists, smugglers, and unauthorized fishing vessels as well as
locate vessels in distress. The present system has been detected at
1915, 3250, 4400, and 5300 kHz.

- It is located at Hartlen Point, NS, near Halifax
(point Google Earth to 44 35 29.47 N 63 26 49.68 W )"

I guess I'll just have to send them a letter telling them to stop it!
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N5XKG
Member

Posts: 5




Ignore
« Reply #8 on: December 17, 2014, 01:21:46 PM »

I think this is the same signal you are talking about... This comes from the UDXF mail list.

"It is a high-frequency surface-wave radar (HFSWR) system, developed
by Raytheon Canada for the Canadian military. It seems to be a new
version of the SWR503 MK2 HFSWR system. It is intended to detect ships
up to 200 miles from a country's coast (EEZ) to protect against
terrorists, smugglers, and unauthorized fishing vessels as well as
locate vessels in distress. The present system has been detected at
1915, 3250, 4400, and 5300 kHz.

- It is located at Hartlen Point, NS, near Halifax
(point Google Earth to 44 35 29.47 N 63 26 49.68 W )"

I was able to hear it this morning here in Bethel, Alaska. Seemed to peak right at 1915, but I could hear it from about 1899-1930khz.
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VE3TMT
Member

Posts: 878




Ignore
« Reply #9 on: December 22, 2014, 06:21:48 AM »

Also hearing something new at 14.185, seems to be an odd pulsing type noise. Anyone else hearing that?

Max
VE3TMT
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