7 Oct
2004
7 Oct
'04
3:07 p.m.
I've got news for you. They still do the same type of thing. There are
hidden signals all over the sperctrum. There ARE benefits to owning a GOOD
surveillance reciever :-)
Joe
At 07:14 PM 10/7/04 -0400, you wrote:
It is little known (but documented) that, during WWII, radio station KHJ
in Los Angeles ( and undoubtedly many others ) sent radio-teletype signals
by shifitng the carrier a miniscule amount - I think about 10 htz, and
using a very slow baud rate. This would not be noticed by the average
equipment of the day, and would take very specialized gear to recover,
store and print
But it allowed messages to be sent large distances by powerful
transmitters - completely 'in the blind'.
Cheers
John