[MilCom] MIL: 13450.0 USB - 9RX (USN trigraph) - SKYMASTER

[Jeff Haverlah]

0409z 21 Aug 25

A singular logging. Today's logs may be "delayed" due to the work involved.
I've heard a lot of "SKYMASTER" events since FY 1997 but this is a first.

UTC 20 Aug 25

13450.0 USB
9RX (USN trigraph)
2040z broadcast (h+10/h+40 window)
R2SF4S
Stated: 244 characters.
Counted: 202 characters.

This string was part of the major exercise on 20 Aug 2025. The HFGCS had
gone "quiet" (assumed exercise destroyed) after the 1652z TOM THUMB (NCS)
broadcast of SE7PRP.  Any message traffic heard after that time until later
in the local afternoon was logged on various USN discrete frequencies from
USN trigraphs.

After listening to a recording of the 2040z broadcast multiple times the
following transcript was generated:

𝚁𝟸𝚂𝙵𝟺𝚂𝟼𝟹𝟺𝚁𝙾𝚃𝙵𝚉𝟼𝟹𝟹𝚉𝙳𝙲𝙺𝙷𝙾𝙺𝙻𝙳𝙳𝟹𝚇𝟹𝟽𝟺𝙵𝙸𝙵𝟽𝟽𝚇𝙱𝟺𝙵𝟺𝟺𝟺𝟺𝟽𝟼𝙺𝙵𝙴𝟼𝙲𝙶𝟽𝟹𝙱𝙾𝙰𝙰𝙶𝙴𝙻𝙰𝙳𝙳𝙳𝙳𝟽𝚆𝚂𝙲𝙻𝙶𝙷𝙷𝙻𝚄𝙶𝟺𝙳𝙳𝙳𝙱𝚂𝟺𝚄𝚄𝚄𝚄𝙺𝙴𝚄𝙴𝟻𝙸𝙽𝟻𝙽𝚉𝙵𝚈𝙶𝙶𝙶𝚆𝚆𝚀𝙼𝙼𝙼*𝙹𝙽𝙺𝚉𝙹𝙰𝟺𝙰𝟼𝙱𝚈𝙿𝟼𝟼𝟼𝚀𝚃𝙹𝟽𝟽𝟽𝟽𝙲𝙷𝚇𝙴𝙹𝙱𝙺𝙹𝙹𝚁𝚀𝚃𝚇𝚇𝚇𝙶𝟸𝚄𝙺𝙺𝙺𝙺𝟹𝚉𝙼𝚃𝙻𝚅𝙻𝙶𝚅𝙵𝙴𝚃𝚆𝙶𝚈𝙱𝙶𝚃𝚆𝚆𝟽𝚄𝙰𝙰𝙰𝚄𝟻𝙽𝙺𝙽𝚉𝚄𝚄𝙺𝙴𝙴𝙴𝙴𝟻𝙹𝙽𝙳𝚀𝟼𝙼𝙿𝚇

Reformatted for clarity:

𝚁𝟸𝚂𝙵𝟺𝚂   [𝙿𝚛𝚎𝚊𝚖𝚋𝚕𝚎; 𝟼]
𝟼𝟹𝟺𝚁𝙾𝚃𝙵𝚉𝟼𝟹𝟹𝚉𝙳𝙲𝙺𝙷𝙾   [𝟸𝟸]
𝙺𝙻𝙳𝙳𝟹𝚇𝟹𝟽𝟺𝙵𝙸𝙵𝟽𝟽𝚇𝙱𝟺𝙵𝟺𝟺𝟺𝟺   [𝟸𝟸]
𝟽𝟼𝙺𝙵𝙴𝟼𝙲𝙶𝟽𝟹𝙱𝙾𝙰𝙰𝙶𝙴𝙻𝙰𝙳𝙳𝙳𝙳   [𝟸𝟸]
𝟽𝚆𝚂𝙲𝙻𝙶𝙷𝙷𝙻𝚄𝙶𝟺𝙳𝙳𝙳𝙱𝚂𝟺𝚄𝚄𝚄𝚄   [𝟸𝟸]
𝙺𝙴𝚄𝙴𝟻𝙸𝙽𝟻𝙽𝚉𝙵𝚈𝙶𝙶𝙶𝚆𝚆𝚀𝙼𝙼𝙼*   [𝟸𝟸] 𝟸𝟷 𝚠𝚒𝚝𝚑𝚘𝚞𝚝
𝚝𝚑𝚎 𝚖𝚒𝚜𝚜𝚒𝚗𝚐 𝙼.
𝙹𝙽𝙺𝚉𝙹𝙰𝟺𝙰𝟼𝙱𝚈𝙿𝟼𝟼𝟼𝚀𝚃𝙹𝟽𝟽𝟽𝟽   [𝟸𝟸
𝙲𝙷𝚇𝙴𝙹𝙱𝙺𝙹𝙹𝚁𝚀𝚃𝚇𝚇𝚇𝙶𝟸𝚄𝙺𝙺𝙺𝙺   [𝟸𝟸]
𝟹𝚉𝙼𝚃𝙻𝚅𝙻𝙶𝚅𝙵𝙴𝚃𝚆𝙶𝚈𝙱   [𝟷𝟼]
𝙶𝚃𝚆𝚆𝟽𝚄𝙰𝙰𝙰𝚄𝟻𝙽𝙺𝙽𝚉𝚄𝚄𝙺𝙴𝙴𝙴𝙴   [𝟸𝟸]
𝟻𝙹𝙽𝙳𝚀𝟼𝙼𝙿𝚇   [𝟿]

There are two problems (maybe) with the above transcript (of the full
recording).

There's an apparent error in the plainly spoken message (in both readings
of the strings) in the 18/quad block that begins with KEUE5. The operator
spoke three distinct M's, not 4. IMO that location was to be a quad of 4
"Ms".  I put an asterisk in the quad to represent the presumed missing Item.

There are clearly 202 characters (201 actually) in the above transcript,
not the spoken 244. *And it looks very familiar*.

It's clearly a repeat of the 202-character string broadcast on 17 Aug 25 at
0841z and seen in my posted logs from UTC 17 Aug 2025.

So where was the 244 character EAM that was maybe supposed to be sent?
That's a rhetorical question.

Jeff
-------------------------------------------------------------------------
Jeff Haverlah               Coastal Texas
     Airspy HF+ Discovery   W6LVP loop  Various web SDRs
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