9 Oct
2004
9 Oct
'04
9:02 a.m.
Now , that is interesting ! I'll have to look that up.
Great.
Geoff.
----- Original Message -----
From: "John Lawson" <jpl15(a)panix.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Friday, October 08, 2004 12:14 AM
Subject: Clandestine data - was: media what died a'bornin'
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
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