16 Nov
2007
16 Nov
'07
5:22 a.m.
Date: Thu, 15 Nov 2007 23:25:13 -0500
From: wdonzelli at gmail.com
To: cctalk at classiccmp.org
Subject: Re: BBC coverage: Colossus vs. Modern hardware
You might check out Heddy Lamar, and spread spectrum modulation on the wiki. It looks
like Telefunken was into this for secret communications. It might turn out to be quite a
bit more sophisticated than you think.
Randy
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I did some fairly bizarre modem design for a
downhole well logging camera, transmitting power and digital video over 5 miles of coax.
I can probably answer any modulation questions you may have, or point you to the
literature I used in my research and design.
I think I can be pretty certain to say the Germans were doing nothing
really odd back then. I am more interested in exactly what kind of set
they were using to do the FSK modulation (and demodulation).
--
Will