ridgescan
Member
EAMs right now started at 0458utc 11175, 8992, and 4724khz-normal here. Still have yet to hear the stuff you guys are describing here. Long EAM still going 0503utc
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I just started hearing Andrews EAM mesageses through the noise crap here in RI at 05:55UTC! ? Phew....!!! Thanks for the info about CODAR. Your right its frigging annoying!!!!!
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Yep, shortly after my last post, I turned up the volume a tad and I'm hearing what I consider a normal amount of voice traffic again. All of it has been from Andrews. They are talking over the odd noise.
I think my ealrier reports of no voice comms were due to a lack of interest due to the noise
Now that I'm paying attention, I must say the voice comms are more than normal so nothing wrong!
Edit: Yes, thanks for the info on CODAR. I do hear that here also and have always wondered what it is. Very annoying!
That is not the sound that masks 11175 however. At least not the sound I'm hearing here.
I'll try and remember to capture the audio from the noise on 11175 when the signal level comes up some. It is very weak here right now.
I think my ealrier reports of no voice comms were due to a lack of interest due to the noise
Now that I'm paying attention, I must say the voice comms are more than normal so nothing wrong!
Edit: Yes, thanks for the info on CODAR. I do hear that here also and have always wondered what it is. Very annoying!
That is not the sound that masks 11175 however. At least not the sound I'm hearing here.
I'll try and remember to capture the audio from the noise on 11175 when the signal level comes up some. It is very weak here right now.
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C
comsec1
Guest
It does not sound like examples of CODAR, more like the laser gun the another poster described. If you tune to the 60m ham band you can get a good idea of CODAR, last night it took out 5366 and 5371.
Current EAM
Receiving current EAM from Andrews on 11.175 and 8.892 / 35M4MQ--- here in South Central KY on 06/12 at 1733z.
David
Receiving current EAM from Andrews on 11.175 and 8.892 / 35M4MQ--- here in South Central KY on 06/12 at 1733z.
David
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I have it too. When David heard the EAM it was not present, I heard that one also.
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Screen Shot of Interference
Here's a screen shot of the interference using my SDR-14. It is the signal in the waterfall on the lower left of the shot and is very "organized" looking. The signal to the left of it may or may not be related; not sure.
Edit: after posting, just to clarify, I tuned away from 11175 so the signal would not be covered by the tuning bar. The signal you're looking for is the first one to the left of the "11.180.0" marker at the bottom left of the shot.
Here's a screen shot of the interference using my SDR-14. It is the signal in the waterfall on the lower left of the shot and is very "organized" looking. The signal to the left of it may or may not be related; not sure.
Edit: after posting, just to clarify, I tuned away from 11175 so the signal would not be covered by the tuning bar. The signal you're looking for is the first one to the left of the "11.180.0" marker at the bottom left of the shot.
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Flashfox
Newbie
Sounds like MIL-STD-188-110B data broadcast although it shouldn't last that long. It's strong here (S7-S9) in Melbourne, Florida (EL98qb)
pathalogical
Member
I heard a couple EAM traffic on 11175 on Fri or Sat evening. Puerto Rico on 8992.
I recorded the sound (wav) on my digicorder and just tried uploading it as a zip, but it didn't show up in my post. Any quick tips....
EDIT: Nevermind...file to large, 1 Mb. I'm surprised no one has a recording of it since this thread started.
I recorded the sound (wav) on my digicorder and just tried uploading it as a zip, but it didn't show up in my post. Any quick tips....
EDIT: Nevermind...file to large, 1 Mb. I'm surprised no one has a recording of it since this thread started.
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Laser gun loud as hell tonight! S9 to S10 here in RI. I think its running 24/7 just fades out in the AM and returns in the afternoon.loudest in the evening.This sucks! Very light activity on the network some EAMs here and there but no Reach calls or Ph patches in a while.
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ka3jjz
Wiki Admin Emeritus
According to Mike Chace-Ortiz and others on the UDXF forum, it's likely the UK MIL modified WinDRM51 modem ... best regards..Mike
CalebATC
Member
Why don't they just move it over to another frequency? Or is it intentional?
pathalogical
Member
I just caught the tail end of an EAM on 11175 yesterday evening. A wopping 210 character message !!! Something big must be going down ! I bet he hates the "I say again..." part of his job.
More info from #wunclub and UDXF group
Subject: [UDXF] IRC Logs for the date of 2011-06-03
Date: Fri, 3 Jun 2011 18:02:37 -0600
11174.6Khz dig Modified pilot-less WinDRM51 UK MIL Akrotiri (on USB) 21:22:09UTC (2011-06-03) (mco in Portland, ME USA on StarChat#wunclub)
Subject: [UDXF] IRC Logs for the date of 2011-06-03
Date: Fri, 3 Jun 2011 18:02:37 -0600
11174.6Khz dig Modified pilot-less WinDRM51 UK MIL Akrotiri (on USB) 21:22:09UTC (2011-06-03) (mco in Portland, ME USA on StarChat#wunclub)
Token
Member
Looking at this thread it is not really possible to say exactly what is going on for each person. There are a couple of different descriptions of what is being heard and that can be confusing. Also, keep in mind that several different types of interference hit that frequency on a daily basis.
The most likely answer is indeed the digital modem that almost everyone has settled on, but some descriptions can sound a bit like an IFMCW radar or sounder also. To try and get everyone on the same page I will include some recordings, as videos, here.
The first video is of the modem that has been described. The video starts with the receiver tuned to 11174.6 kHz USB. Part way through the video (0:28 into the vid) a Skyking transmission is sent on 11175 kHz USB, and I retune the receiver to that frequency.
YouTube - ‪Skyking and interference, 11175 kHz, USB, June 16, 2011, 0438 UTC‬‏
The second and third video is of a radar or sounder. This particular one is hitting 8992 kHz (another HF-GCS frequency) but I have seen it hit 11175 kHz also, I just don’t happen to have a video of that happening that I can easily find. Also, these videos show the radar/sounder stepping through various modes, however it often uses a single mode, most typically the last mode in each string but it can be any of these modes. The second video of this pair shows a pilot or carrier tone sent at the end of each segment, the radar/sounder is often seen on the air both with and without this carrier tone.
YouTube - ‪Radar or Sounder, 8992 kHz, September 24, 2010, 1338 UTC‬‏
YouTube - ‪Radar or Sounder, 8992 kHz, April 17, 2011, 1510 UTC‬‏
Hopefully this will help people decide what they are hearing, the modem or a radar/sounder. I know I see them both here at times, sometimes on top of each other and sometimes only one or the other. Regardless, regular 11175 kHz traffic has been present even when the modem or the sounder, or both, were present.
T!
The most likely answer is indeed the digital modem that almost everyone has settled on, but some descriptions can sound a bit like an IFMCW radar or sounder also. To try and get everyone on the same page I will include some recordings, as videos, here.
The first video is of the modem that has been described. The video starts with the receiver tuned to 11174.6 kHz USB. Part way through the video (0:28 into the vid) a Skyking transmission is sent on 11175 kHz USB, and I retune the receiver to that frequency.
YouTube - ‪Skyking and interference, 11175 kHz, USB, June 16, 2011, 0438 UTC‬‏
The second and third video is of a radar or sounder. This particular one is hitting 8992 kHz (another HF-GCS frequency) but I have seen it hit 11175 kHz also, I just don’t happen to have a video of that happening that I can easily find. Also, these videos show the radar/sounder stepping through various modes, however it often uses a single mode, most typically the last mode in each string but it can be any of these modes. The second video of this pair shows a pilot or carrier tone sent at the end of each segment, the radar/sounder is often seen on the air both with and without this carrier tone.
YouTube - ‪Radar or Sounder, 8992 kHz, September 24, 2010, 1338 UTC‬‏
YouTube - ‪Radar or Sounder, 8992 kHz, April 17, 2011, 1510 UTC‬‏
Hopefully this will help people decide what they are hearing, the modem or a radar/sounder. I know I see them both here at times, sometimes on top of each other and sometimes only one or the other. Regardless, regular 11175 kHz traffic has been present even when the modem or the sounder, or both, were present.
T!
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pathalogical
Member
The first vid of June 16 is what I hear on 11175 with varying degree of signal strength, usually stronger in the evening. Great recordings too !
Token
Member
It is not new, it has been being reported on this frequency occasionally since 2008. It may have been on 11175 before that but not reported by listeners. It was seen on other frequencies before then.
I would venture to say it is probably not US mil, but it might be some other countries mil. Using multiple remotes (across the US, in Europe and Asia, and one in Iceland) over a 24 hour day the signal seems to be most consistantly strong in Iceland.
T!
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