[Milsurplus] Re: [ARC5] NPC: A Tune for Pearl Harbor Day

[Gene Smar]

Gents:

     All this talk about military radio and early recordings reminded me of 
SIGSALY.  This was the encrypted voice HF system that linked WWII personnae 
such as FDR, Churchill, MacArthur and others of similar ilk.  The primitive 
PCM-encoded voice signals were then encrypted by using an audible 
random-noise generator source that was pressed onto recording disks in pairs 
and transported to opposite ends of the links.  A matched pair of these 
recordings was used as a one-time encryption pad for HF conversations 
between principals.

     The Wiki source (Caveat Amateur)  http://en.wikipedia.org/wiki/SIGSALY 
shows several links to NSA web pages and others on this facinating subject.

     FWIW.


73 de
Gene Smar  AD3F
P.S.  The technology was kept secret until 1976.


----- Original Message ----- 
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
To: "Mike Hanz" <AAF-Radio-1 at aafradio.org>
Cc: "Milsurplus" <milsurplus at mailman.qth.net>
Sent: Friday, December 07, 2007 4:13 PM
Subject: Re: [Milsurplus] Re: [ARC5] NPC: A Tune for Pearl Harbor Day


> On Dec 7, 2007 2:29 PM, Mike Hanz <AAF-Radio-1 at aafradio.org> wrote:
>> I thought the mass produced records of WWII were shellac - I know I
>> accidentally broke more than one when I was a kid, much to the
>> irritation of my parents.  Originals were aluminum disk coated with
>> black lacquer, or at least that's what the ANQ-2 disk recorder uses.
>
> Yep, I have some of those from an old radio station with early 40s
> dates. The black lacquer is peeling off one of them, exposing the disc
> inside. Used for announcements and such, they could very well have
> been old stock used during the war. Hard to believe they'd be using
> aluminum during that time. Others I've seen look like some kind of
> particle board material. And it's been years since I paid much
> attention, but I do have some 'black vinyl' looking recordings from
> the early/mid 40s timeframe.
>