Stubby wrote:

The funny thing about using AM stations is the US Government fielded the
old CONELRAD system to prevent the "enemy" from doing this during an
attack. That threat is minimal these days, NDBs are going away, but the
CONELRAD system keeps being revised. I hear several tests every week.

The old CONELRAD (CONtrol of ELectromagnetic RADiation) system involved
all AM stations retuning to either 640 or 12-something and switching on
and off. It became obsolete when other missile-lobbing nations
developed inertial navigation, in the '60s or so.

The modern EAS has about as much to do with the old CONELRAD program as
GPSes do with NDBs.

--
Eric Weaver PP-ASEL-IA Studio Engineer, KNGY SF

He worked in local radio, which he always used to tell his friends
was a lot more interesting than they probably thought. -- D. Adams