high speed data

[alok]

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.

Al

 

[SDRPlayer]

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

 

[ka3jjz]

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...

Mike

 

[SDRPlayer]

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