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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.space
Subject: "shadowing" of satellites in GEO ...
Message-ID: <6251@utzoo.UUCP>
Date: Thu, 2-Jan-86 13:55:49 EST
Article-I.D.: utzoo.6251
Posted: Thu Jan  2 13:55:49 1986
Date-Received: Thu, 2-Jan-86 13:55:49 EST
References: <441@brl-tgr.UUCP>, <33400001@hpfcmp.UUCP>
Organization: U of Toronto Zoology
Lines: 14

> Earth  station  operators  (like the plant I work at) already have to put up
> with  such  interference.  A few  (predictable)  times  a year,  the  SUN is
> directly behind the satellite we use for video conferencing.  The sun, being
> a prodigious radio source, wipes out the signal for about ten minutes.

Point of curiosity:  given that your receiver (okay, picky picky, your LNA)
is at the focus of a roughly parabolic antenna, how do you avoid having the
Sun fry the receiver?  I assume that you aren't moving the antenna to dodge
the sun, since antennas for geosynch satellites generally aren't fitted with
that flexible a mount.  Does it suffice to be careful about the infrared
reflectivity of the dish surface?
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry