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Author Topic: ALE and MIL-STD 188-110 8025 USB 1915 UTC 01 DEC 2022  (Read 400 times)

Offline ButchKidd

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ALE and MIL-STD 188-110 8025 USB 1915 UTC 01 DEC 2022
« on: December 01, 2022, 2020 UTC »
Received via W3HFU KiwiSDR at S7 to S9.  Appears to be National Guard net with ALE calls as well as MIL-STD 188-110A ARQ sessions.  Could this be an HF mail system?

Interestingly, the 110A traffic didn't seem to stop during the ALE calls, so I'm not absolutely sure that the calling station wasn't transmitting on top of someone.

[No Timestamp][Call] [from MI5JOC      ] [to WI5JOC      ]
[No Timestamp][Call] [from MI5JOC      ] [to IL5JOC      ]
[19:35:58] [Call] [from MI5JOC      ] [to MN5JOC      ]
[19:41:55] [Call] [from MI5JOC      ] [to OH51JOC     ]
[19:47:46] [Call] [from MI5JOC      ] [to WI5JOC      ]
[19:59:31] [Call] [from MI5JOC      ] [to IN51JOC     ]
[20:05:00] [Call] [from MI5JOC      ] [to IN5C        ]
[20:11:20] [Call] [from MI5JOC      ] [to OH51JOC     ]
[20:17:11] [Call] [from MI5JOC      ] [to WI5JOC      ]
[20:22:58] [Call] [from MI5JOC      ] [to IL5JOC      ]

Link to recording:
https://archive.org/download/mil-std-188-141-and-mil-std-188-110-2022-12-01-t-19-59-17-z-8025.00-usb/MIL-STD-188-141_and_MIL-STD-188-110_2022-12-01T19_59_17Z_8025.00_usb.wav
« Last Edit: December 01, 2022, 2028 UTC by ButchKidd »
eQSL appreciated at x100rocks@gmail.com
Airspy HF+ Discovery, Yaesu FT-857D and FT-450D, Whistler TRX2
130 ft OCF, 130 ft inverted L, 11m ground plane

Offline ~SIGINT~

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Re: ALE and MIL-STD 188-110 8025 USB 1915 UTC 01 DEC 2022
« Reply #1 on: December 02, 2022, 0058 UTC »
This ALE traffic all originated from the US National Guard JOC Net.

[No Timestamp][Call] [from MI5JOC      ] [to WI5JOC      ]
MI5JOC      NGB         JOC Net   Mississippi

I personally don't like the Kiwi ALE decoder unless you enable all of the proper headers to see what the traffic is.

[20:22:58] [Call] [from MI5JOC      ] [to IL5JOC      ]
IL5JOC      US Army NG      IL Joint Ops Ctr.

The first 2 letters of the call sign should represent the State.

From your recording, the 110 traffic was a mix bag of 75 BPS LONG, 600 BPS SHORT and 2400 BPS SHORT and predominently 2400 BPS SHORT with a bunch of encrypted text.

 22  21  20  19  18  17  16  15  14  13  12  11  10  9  8  7  6  5  4  3  2  1  0
 DATA RATE 75  LONG INTERLEAVER

 DATA RATE 2400  SHORT INTERLEAVER

 DATA RATE 600  SHORT INTERLEAVER
[EOM]

 22  21  20  19  18  17  16  15  14  13  12  11  10  9  8  7  6  5  4  3  2  1  0
 DATA RATE 2400  LONG INTERLEAVER
[EOM]
 1  0
 DATA RATE 600  SHORT INTERLEAVER
[EOM]

 1  0
 DATA RATE 2400  SHORT INTERLEAVER

 DATA RATE 600  SHORT INTERLEAVER
[EOM]

 1  0
 DATA RATE 2400  SHORT INTERLEAVER

 DATA RATE 600  SHORT INTERLEAVER
[EOM]

 1  0
 DATA RATE 2400  SHORT INTERLEAVER

The one ALE decode was:
[HH:MM:SS][FRQ 08025000][TO ][IN51JOC        ][TIS][MI5JOC         ][AL0] BER 30 SN 08
« Last Edit: December 02, 2022, 0149 UTC by ~SIGINT~ »

Offline ButchKidd

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Re: ALE and MIL-STD 188-110 8025 USB 1915 UTC 01 DEC 2022
« Reply #2 on: December 02, 2022, 1809 UTC »
Yeah, I was sending the audio to external programs so I could try to decode them both at once.  The ALE log is from Multi-PSK, and I truncated it down to just the calls.  I suppose I should include the SINAD, BER, and LQA info as well next time.

I was able demodulate the 110 as well, but as you said, the actual traffic was encrypted.  The short preamble on most of the transmissions makes me suspect a system that establishes a session between to stations with 75/long, and then switches to a higher bitrate with short preambles for the duration of the session.  The long periods of 2400/short with little bursts of 600/short made me think about sending blocks of data with the receiving station sending ACKs/NAKs.
« Last Edit: December 02, 2022, 1812 UTC by ButchKidd »
eQSL appreciated at x100rocks@gmail.com
Airspy HF+ Discovery, Yaesu FT-857D and FT-450D, Whistler TRX2
130 ft OCF, 130 ft inverted L, 11m ground plane

 

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