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

[Stan Barr]

Hi,

John Lawson <jpl15 at panix.com> 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.

-- 
Cheers,
Stan Barr  stanb at dial.pipex.com

The future was never like this!