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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 12-04-2017, 7:02 PM
Join Date: Sep 2009
Posts: 33
Default high speed data

I hear in many places on HF ,very often around 10.151 Mhz USB a very fast almost RTTY sounding mode,what mode is it and who is transmitting it ? Is it encrypted ?
If I run RTTY software , to try to decode it at the fastest speed it just gives a bunch of letters / symbols.
It seems to end transmission with a constant carrier / tone.

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Old 12-04-2017, 7:56 PM
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Join Date: Jul 2016
Location: Victoria, Australia
Posts: 126

yes, it is encrypted 50/850, or STANAG 4481 @ 75/850, generally U.S Navy.

Last edited by SDRPlayer; 12-04-2017 at 8:00 PM.. Reason: added more info
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Old 12-04-2017, 9:58 PM
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The USN has had a frequency for many years inside our 30m band (I think we're secondary users in that band). So now they have one right on the edge of the allocation...wonderful...

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Old 12-04-2017, 10:03 PM
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Location: Victoria, Australia
Posts: 126

i've noticed at times (from my qth) that it is quite noisy/messy/dirty. unsure if it atmospherics or what.
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