[MilCom] MIL: 11175.0 USB - AMBITIOUS; AUTOGRAPH; STEAM CAR; and BROADLEAF

[Jeff Haverlah]

0034z  28 Feb 26

UTC 27 Feb 26

[0033z is beginning to call attention to itself in the month of February.]
========
0033z: AMBITIOUS (NCS); 37Z46C; P1
37Z46C
[Fed to the Gulf E6B.]

[0044z: 27.2 KHz (Gulf) VLF FSK MSK broadcast.]

0100z: Nothing heard on SDRs in use.
0130z: AUTOGRAPH (pre0000z TELEGRAM); 37Z46C; h+00/h+30 NCS/ABNCP/Gulf
restoral rebroadcast window.
========

========
0547z: AMBITIOUS; ESGTKB; 25 characters; P4.
ESGTKBPSWZT55XUEXQESXO5I7

0554z: AMBITIOUS; ESIMYS; 48 characters; P4.
3SIMYS6XY6SGXEQKEUKXN3QEP4R2HXXXBXN3PEPR5OHXBCWO

Reformatted for common structure:

𝟹𝚂𝙸𝙼𝚈𝚂  [𝙿𝚛𝚎𝚊𝚖𝚋𝚕𝚎; 𝟼]
𝟼𝚇𝚈𝟼𝚂𝙶𝚇  [𝟽]
𝙴𝚀𝙺  [𝟹]
𝙴𝚄𝙺  [𝟹]
𝚇𝙽𝟹𝚀𝙴𝙿𝟺𝚁𝟸𝙷𝚇𝚇𝚇𝙱  [𝟷𝟺]
𝚇𝙽𝟹𝙿𝙴𝙿𝚁𝟻𝙾𝙷𝚇𝙱𝙲𝚆  [𝟷𝟺]
𝙾 [𝟷]

0558z: AMBITIOUS; ESIMYS; echo rebroadcast; weak levels.

0608z: AMBITIOUS; ESGTKB; echo rebroadcast; 11175.0 system wide; weak.

0613z: MAINSAIL with test count.

0711z: AMBITIOUS; ES7D5I; 22 characters; P4.
ES7D5IKKQJ6JQCUFN22LBN

0716z: AMBITIOUS; ESSM3O; disregard (no character count).

0717z: AMBITIOUS; ESSM3O; 32 characters; P4.
ESSM3OS5KQD5QTEEN35ISHG7AIHW7OYF

0806z: AMBITIOUS; 37PDGA; P1.
37PDGA2XIEIJAKLQUVWOXQY7KUGOPI

0809z: AMBITIOUS; 37U47M; P1.
37U47M2MRDINCVHPNPW762HDYF7GI6
========

Quiet.

[13#3z FOR string pattern always beginning at 03; now apparently on a
Friday instead of Thursday (2025) or Wednesday (2024).]
========
1303z: AMBITIOUS; FOR PADDLE; I4V5VR; P2.
I4V5VRNROLSKCO3POONQCKCWO5ARRD

[20 minutes.]

1323z: AMBITIOUS; FOR PADDLE; I4KHS3; P2.
I4KHS3BCSE2B4HIPNIO6NUQ23IUEFP

[20 minutes.]

1343z: AMBITIOUS; FOR PADDLE; I4ZXW7; P2.
I4ZXW7K6UXKLO4JEXLTEFGV2N7WPGA
========

Quiet.

[1637z+/-: AEBE96 E6B launched from OFFUTT southbound to the Gulf and then
return to OFFUTT.]
[1657z+/-: AE403B E6B launched from TINKER southbound to the LAKE CHARLES
area and then return to TINKER.]

========
1720z: AMBITIOUS; FOR (sounds like DELPA) 58; I47E7N; P2.
I47E7NEMTK3X6M62PTGBO7X52L3L44

1728z: SAME 28 called and raised MAINSAIL for a signal check. Over the
southeastern CONUS enroute to the Atlantic at the time of broadcast.

********
1733z: AMBITIOUS; I4TY3D; P2.
I4TY3DRYOUY2ZQOEHXA4ZZ7VGXLR73
********

[1743z: AFA7E9 E6B launched from PAX RIVER to the Atlantic; TACAMO LANT;
then returning to the Atlantic coast for a tour of New England and pattern
work over RHODE ISLAND.]

[30 minutes.]
1750z: AMBITIOUS; 373LVH; P1.
373LVHAPHXYXAQ2EVIIN3WWPFIEZSL
[Fed to TACAMO LANT only.]

1804z: AMBITIOUS; I47NUO; 32 characters; P2.
I47NUOQRDVLDCHBB6C2J4NZGD6ZASN56

1828z: STEAM CAR (presumed AFA7E9) called and raised AMBITIOUS to enter the
net.
1831z: STEAM CAR entered the net; offshore over the Atlantic at that time.

1840z: STEAM CAR; 373LVH; h+10/h+40 TACAMO LANT restoral rebroadcast window.

*******
1843z: AMBITIOUS; 888800; Pconnectivity.
888800..voice "disregard"; disregarded.
********

1850z: BROADLEAF (presumed AEBE96 over Gulf); 3773M6; P1.
3773M6L6KQXSZZGEUH3OTGLC4XTZS6
[Gulf string for restoral rebroadcasts.]
[Preceded the NCS broadcast of same; in the past that would often indicate
the ABNCP mission).]

[1853z: 17.8 KHz (LANT) VLF FSK MSK broadcast of 373LVH.]

1854z: AMBITIOUS; 3773M6; trailing BROADLEAF's broadcast of same.

[1900z+/-: 27.2 KHz (Gulf) VLF FSK MSK broadcast of 3773M6.]

1900z: BROADLEAF; 3773M6; Gulf restoral.

1910z: STEAM CAR; 373LVH; LANT restoral.

1930z: BROADLEAF; 3773M6; Gulf restoral.

1940z: AFK

2000z: BROADLEAF; 3773M6; Gulf restoral.
2010z: Nothing heard.
2030z: BROADLEAF; 3773M6; Gulf restoral; northbound directly northeast of
HOUSTON, TEXAS at that time.
========

========
2033z: AMBITIOUS; I4DKU7; 38 characters; P2; now rare character count.
I4DKU72G5KH3QNOXEV3OZ55VNBIN2B7KTN6JNU
========
This is the first 38-character string in this series since 29 Jul 25.
The 38-character strings appear to be another set that manifests a possible
"change" in April 24. The strings were "rare" but apparently clustered in
certain months when they occurred through April 24; and then relatively
"quiet" after April 24.
See:
https://neetintel.github.io/structure_heatmap_38char.html
https://x.com/ParssinenPaulus/status/1935109812104348090?s=20 [Click
through the images to find the 38-set; and today's string does not appear
to conform to the 2024 and earlier formatting indicated in that applicable
image.]

Quiet.

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