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From: mpackard@uok.UUCP
Newsgroups: net.ham-radio
Subject: RE: White house radios - (nf)
Message-ID: <2800017@uok.UUCP>
Date: Sun, 26-Aug-84 14:10:00 EDT
Article-I.D.: uok.2800017
Posted: Sun Aug 26 14:10:00 1984
Date-Received: Wed, 29-Aug-84 05:33:16 EDT
Lines: 12
Nf-ID: #N:uok:2800017:000:423
Nf-From: uok!mpackard    Aug 26 13:10:00 1984

#N:uok:2800017:000:423
uok!mpackard    Aug 26 13:10:00 1984

[]

I'm just guessing but the radios probably use the same technology as
the military which send a sync tone and then convert the audio to
digital, scramble it, and convert it back to audio.  When you listen
you should hear a tone followed by static.  This is called wide band
secure.  This method was attempted by motorola several years back
but the users were not impressed with it, due to the sync problem.
uok!mpackard