In article .com,
wrote:
So for who are these signals intended?

Most of my books are 15-20 years old, so they may be a bit out of date.

In _Nuclear Battlefields_ by Arkin and Fieldhouse, a book on the
infrastructures for nuclear war from 1985, they say that they're used
for communications with submarines. That book says there are four
transmitter sites in the Pacific, (Northwest Cape, Australia,
Yosami, Japan, Jim Creek, Washington, and Wahiawa, Hawaii).

The signal was quite strong, so you are probably correct. When you
don't know exactly how to monitor a signal, it is tough to nail the
frequency exactly.

I cheated. That is out of a Grove book, their _Shortwave Directory_
dated 1988, out of a longwave logging list credited to the LWCA
(Long Wave Club of America?). They also list stations in Maine and
Puerto Rico. But if you know your BFO offset, you can get a good idea
if you zero beat, or otherwise measure the frequency, like with a 0'scope.

Do you know the mark/space frequencies?

It's MSK, Minimal Shift Keying(?). It's a very narrow shift, related
to the baud rate. Even then, they have to switch the antenna tuner in
sync with the modulation, according to some ham friends who got a tour
of the place many years ago. (They date from the 1950's or eary 1960's).


Mark Zenier Washington State resident