EAM.

This is coolbert:

From the previous blog entry:

"* High-frequency [HF] long-haul radio communications that the military has relied upon for decades - - and still in use [??] - - will no longer be possible."

"American military units on SIOP [nuclear-equipped] alert still rely heavily [?] on HF?"

Thanks to a variety of sources, some comments about those messages as sent to American units dedicated to a SIOP mission [nuclear war fighting]!

Messages in many cases sent via high-frequency radio communication, those transmissions to become null and void if and when a Maunder Minimum occurs.

EAM. Emergency action messages. Those messages to nuclear equipped American military units world-wide, the go and no-go codes. Messages encrypted and sent both as practice and for the purpose of defeating "traffic analysis".

"EAM: Though generally referring to a category of urgent messages from commanders to deployed forces, EAM is often used as a short-hand expression for a specially coded nuclear attack directive."

"'Emergency Action Messages' (EAMs), they are war fighting instructions to the United States nuclear forces."

"The messages . . . relayed to aircraft that are on alert . . . via single-sideband modulation radio transmitters of the High Frequency Global Communications System [HFGCS] (formerly known as the Global High Frequency Service)"

Dedicated radio monitoring hobbyists and indeed anyone possessing an adequate antenna and a radio receiver able to tune the high-frequency band [3-30 MHZ] and demodulate upper-sideband transmissions can monitor these EAMtransmissions. Frequencies posted and currently in use to include: [All frequencies in MHZ, upper-sideband [USB].]

4.724
6.712
6.739
6.697
8.776
8.992   (ideal for monitoring during North American nights)
11.175 (the most productive for day to day monitoring of the U.S. military on HF)
11.244
13.155
13.200
15.016.

Thanks to the Nuclear Warriors on HF Radio web article listen to some samples of EAM from these various links:

EAM Audio Samples:WHITEFISH transmitting an EAM on 8.776 MHz 09/26/2008
ANDREWS transmitting an EAM on 8.992 MHz 09/26/2008
ANDREWS transmitting an EAM on 8.992 MHz 11/10/2008
ANDREWS transmitting an EAM on 8.992 MHz 11/25/2008
ANDREWS and KALABACK overlapping (sending same EAM) on 8.992 MHz 11/25/2008

Good luck and good hunting. I would assume to that the U.S. military and indeed anyone else reliant upon long-haul reliable HF is currently pondering the consequences of a potential Maunder Minimum and making preparations and contingencies!

coolbert.