UNID 6823 USB 0127 UTC 20 July 2018

[PRO2006]

Some sort of Net..military?...callsigns like 8 Lima November, Mike 8 Alpha

They talk for a bit and then send digital data...then check if others got the message.

[Looking-Glass]

American, British, Russian or Asiatic English accents? 

I get some weird spasmodic Russian military style traffic on the upper portions of 6MHz this way in USB mode.  Probably from Russian Navy or Russian Army in the Vladisvostok region or other parts of the Russian Far East. They often speak odd snippets in English for some reason.

Philippine military also was heard last summer in the same frequency area in English but with the unique accent.

Band not open at 0127z this way being broad daylight, however, will check it out at night.

[MDK2]

I think MARS nets happen at that frequency, but I'm not positive. Possibly a CAP net, but this sounds a bit more like a MARS net. Maybe Josh, HFU's resident expert on military coms, can weigh in.

[R4002]

MARS is known to use voice and then transmit data bursts.  Sometimes you'll hear operators ask for re-transmissions of data if you listen to enough MARS traffic.  Chances are you were hearing a MARS net.  C

[Josh]

For a MARS tactical situation they might abbreviate their callsigns;
AA6RYU becomes 6RY, you get the idea.
For NATO aligned militaries, one callsign convention is LFL, such as N0S, P3A, W4J, etc. I'd have to listen to them to see if they're MARS or mil.

If they give an id for the net you can tell what branch it is if MARS thus;
 SERVICE/NET ID       
 FLFL = USN/MC         
 LFL  = Army/AF         
                     

QRG DESIGNATION        CALLSIGN PREFIX
 LFFF = USA                   NNN = USN/MC
 LLL  = USN/MC              AA_ = USA 
                                     AFA = USAF

[PRO2006]

It was american Looking Glass..thanks.

MARS would make perfect sense.

I kept thinking it sounded like something in between a regular Ham Net and something sort of military. I kept lowering gain and changing sample rates to make sure it was not a Ham image. That has caught me a couple times with my SDR logging pirates when it gets in a funky state and I am logging SW broadcast images.

I heard twice "Unable to transmit digital on this frequency". Another station said send slower which they did..everyone seemed happy and they closed the Net. I also believe they popped up quickly on 6913 and then off.

I will try and pay more attention to the ID next time.

https://www.hfunderground.com/board/index.php/topic,22168.msg80085.html#msg80085


Thanks for all the input.

[Josh]

There's been a move in the last few years for MARS to standardise on 110A mode for sending digital traffic, so have a 110A decoder up, in ascii/8n1 for those messages and message parts that aren't encrypted.

From what I recall, they employ Encryption Wizard as the offline crypto whatsit;
 https://www.spi.dod.mil/ewizard_govt.htm

All of this was long after I was NNN0XXX in Navy MARS, back then we did no crypto, and used pactor to send digi traffic via hf. Shame they did away with Navy MARS.