Clandestine data - was: media what died a'bornin'

From: John Lawson <jpl15_at_panix.com>
Date: Thu Oct 7 18:14:13 2004

  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
Received on Thu Oct 07 2004 - 18:14:13 BST