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Shortwave Data Decoding Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

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Old 04-30-2014, 7:46 PM
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Default Strange Pulse Tone On 11220kHz

Never heard this sound before. Strange pulsing tone on 11.220.5 USB. Anybody have any clues as to what this may be? Time 0044UTC


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Old 04-30-2014, 8:05 PM
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Probably ARARS since it's in the HF aircraft assignment.
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Old 04-30-2014, 9:04 PM
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Im no expert on ACARS systems but the rapid tones and the rhythm of the tones do not sound like ACARS. ACARS on HF usually sounds like a beep and than a long data burst. I wish I had a cable to record it. If you tune to the freq you may be able to hear it from Texas?
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Old 04-30-2014, 11:59 PM
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It's likely a bad Tx.
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Old 05-01-2014, 7:10 AM
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Also heard down here in Brisbane, Australia @ 1201utc, its about S4 here

here is a recording of it
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Old 05-01-2014, 7:30 AM
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I have heard it several times also in the last year. To me it sounds like some type of data burst. As to what it is , I have no clue. But curious also. Mike
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Old 05-01-2014, 9:05 AM
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I noticed this last night and took a quick look at it. It appears to be a 4FSK signal. Mike Chase-Ortiz thinks it is a TE204 4FSK system that is having a few technical problems, and I would tend to agree based on what I can find in print and on the web.

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Old 05-01-2014, 9:27 AM
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Quote:
Originally Posted by Token View Post
I noticed this last night and took a quick look at it. It appears to be a 4FSK signal. Mike Chase-Ortiz thinks it is a TE204 4FSK system that is having a few technical problems, and I would tend to agree based on what I can find in print and on the web.

T!
Thanks Token! Im guessing a TE204 is some sort of military computer modem?


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Old 05-03-2014, 9:22 AM
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Quote:
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Thanks Token! Im guessing a TE204 is some sort of military computer modem?


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Yes. The designation is TE204 or AN/USC-11 modem.

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Old 05-03-2014, 2:27 PM
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Quote:
Originally Posted by Token View Post
Yes. The designation is TE204 or AN/USC-11 modem.
It's off air as of today.
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