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

From: Stan Barr <>
Date: Fri Oct 8 03:02:34 2004


John Lawson <> said:

> 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'.

The BBC still do this on their 198KHz long wave transmitter, easily heard
by switching the receiver to ssb mode.

Stan Barr
The future was never like this!
Received on Fri Oct 08 2004 - 03:02:34 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:37:21 BST