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!
Received on Fri Oct 08 2004 - 03:02:34 BST