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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.followup
Subject: Re: Re: Alternate Energy & Microwaves
Message-ID: <4235@utzoo.UUCP>
Date: Sat, 18-Aug-84 18:41:41 EDT
Article-I.D.: utzoo.4235
Posted: Sat Aug 18 18:41:41 1984
Date-Received: Sat, 18-Aug-84 18:41:41 EDT
References: <1702@inmet.UUCP>
Organization: U of Toronto Zoology
Lines: 27

> I have a question about SPS microwaves for those more knowledgeable -
> granted the u-waves don't fry birds, wouldn't they fry every radio on an
> airliner passing through/close to the beam? ...

> ...what about
> satellites that might pass between a geostationary power satellite and its
> ground station? ...

> [he also mentions ground-based microwave transmissions]

Communications interference from powersats is not a trivial topic, but
it looks manageable.  The wavelength for powersat transmissions will be
in the industrial-microwave band, almost certainly, and this is not at
the same frequency as communications.  Note that there is no need for
more than one frequency for powersats, so the problem comes down to
filtering out one offending frequency that is well away from the normal
communications bands.  (Well, harmonics complicate the issue a bit...)
Powersats will definitely create interference, and communications systems
will need some work, but last I heard it didn't look impossibly hard.

It helps that powersat beams will be put out by emitters perhaps a
kilometer on a side; they'll be by far the tightest microwave beams ever
generated.  The intensity will fall off very quickly indeed outside the
area of the rectenna.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry