Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbfsb!cbnewsc!psfales
From: psfales@cbnewsc.att.com (Peter Fales)
Newsgroups: sci.electronics
Subject: Re: Phone scrambler
Keywords: Phone scrambler
Message-ID: <1991Mar24.134827.6566@cbnewsc.att.com>
Date: 24 Mar 91 13:48:27 GMT
References: <1991Mar23.215050.24738@sugar.hackercorp.com> <1991Mar24.012754.9816@athena.cs.uga.edu>
Organization: AT&T Bell Laboratories
Lines: 20

In article <1991Mar24.012754.9816@athena.cs.uga.edu>, mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>   In sum:
>     
>     300-to-3000-Hz bandpass filter on input
>     Oscillator 5000 Hz or so
>     (no, make that 3500 Hz)
>     Doubly balanced mixer
>     300-to-3000-Hz bandpass filter again on output
> 
> 

Sure, it's a standard Sophoomore communications lab experiment.  It
is not terribly secure though.  Anyone one who wants to listen in 
will have little difficulty building the "descrambler."

-- 
Peter Fales			AT&T, Room 5B-420
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