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

[Geoffrey Thomas]

Now , that is interesting ! I'll have to look that up.
Great.
Geoff.

----- Original Message -----
From: "John Lawson" <jpl15 at panix.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at 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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