Strange Pulse Tone On 11220kHz

[SCPD]

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


Rob

 

[aggie72]

Probably ARARS since it's in the HF aircraft assignment.

 

[SCPD]

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?

 

[SCPD]

It's likely a bad Tx.

 

[zl2taw]

Also heard down here in Brisbane, Australia @ 1201utc, its about S4 here

here is a recording of it

 

[Haley]

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

 

[Token]

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!

 

[SCPD]

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?


Rob

 

[Token]

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


Rob

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

T!

 

[SCPD]

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

It's off air as of today.