HFU HF Underground
Loggings => Utility => Topic started by: Ragnar on August 20, 2013, 2313 UTC
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Saw this digital station 23:00 8/20/13 on 6940-45. unshure of the mode Chris on the chat thought it was PSK that is mirrored.
(http://gulchsource.shacknet.nu:6955/Images/UNIDdigital082013.png)
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It looks to me like whatever it is is in DSB on 6942 kHz.
Without an audio or I/Q recording I cannot be sure what it is. I can think of a couple it might be, the leading possibility in my mind would be Link 11 CLEW, the pilot (Doppler) tone at about 600 Hz (should be 605 Hz) and the Synch stream at about 2900 Hz (should be 2915 Hz) make me think that is what it is. Another possibility would be MIL STD 188-110A Appendix B 39 Tone. The pilot tone for that would be a bit lower, near 400 Hz. The image just does not have enough detail to give me a warm fuzzy on which it is.
T!
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Yes I caught that north of Detroit around the same time. I posted about it in the "others" forum below. Best way to describe the noise was a constant hum/hiss type noise. I should have recorded it :P
(http://i487.photobucket.com/albums/rr233/bdm123456/noise_zps8a25d68c.png) (http://s487.photobucket.com/user/bdm123456/media/noise_zps8a25d68c.png.html)