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Author Topic: UNID 6738.6 USB  (Read 1398 times)

Offline stevechisox

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UNID 6738.6 USB
« on: June 04, 2011, 1720 UTC »
5:17 UTC June 4th
6738.6

Really strong signal, but was basically a voice saying "Tango, Whisky, Zulu, Golf" etc ended with a "that is all" and went off the air. Sounds like it was military. Can someone explain what this was? Some kind of test message, a drill or EAM?

Offline Token

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Re: UNID 6738.6 USB
« Reply #1 on: June 07, 2011, 0236 UTC »
The actual frequency is 6739.0 USB.  It is part of the HF-GCS (High Frequency Global Communications System).  It is military, it can be accessed by any US service but is predominantly US Air Force.

There are sites located all around the World, and it is not unusual to hear a pronounced echo on the signal, this echo is caused by you receiving more than one station at the same time.

Frequencies to watch for this traffic are 4724, 6739, 8992, 11175, 13200, and 15016 kHz, all are in USB mode.  There are other frequencies as well, but those are the most active.  It is common, in fact it is the norm, to hear the same message on multiple frequencies at the same time.

Without more detail it is impossible to tell exactly what kind of message you heard, there are several common types, but it is quite likely it was indeed an EAM.

T!
T!
Mojave Desert, California USA

Offline stevechisox

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Re: UNID 6738.6 USB
« Reply #2 on: June 07, 2011, 1735 UTC »
Thanks for the info! I really appreciate it. I have been listening to shortwave for years (stopped for awhile), but I was never really into the utility stuff. I didn't realize what I was missing, this is some really interesting stuff.