From: SINCLAIR  DOUGLAS N <sinclai@ecf.toronto.edu>
Date: Sun, 18 Feb 1996 06:32:00 +0800
To: dsmith@midwest.net (David E. Smith)
Subject: Re: Using lasers to communicate
In-Reply-To: <2.2.32.19960217173350.0067d5b4@204.248.40.2>
Message-ID: <96Feb17.170738edt.666@cannon.ecf.toronto.edu>
MIME-Version: 1.0
Content-Type: text/plain


> >An interception device will stick out like dogs balls.  Whoever wants to tap
> >my line is going to have to build a tower.
> 
> Depends upon how paranoid you want to be.  A small radio-controlled
> helicopter is available cheaply at Radio Shack, and might even be
> capable of holding a receiver, re-transmitter and recorder.


If I wanted to intercept a laser beam I'd spray an aerosol mist
into the beam and look at the scatter.  On a dusty or humid day I
might not need the aerosol.

Why not just encrypt the link?  Then anyone can tap and it doesn't matter.
I'm in the process of building a tightbeam microwave link that can carry
2 Mbps over 50Km.  Anybody got any gunn transceivers they don't need?