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Path: utzoo!linus!decvax!harpo!seismo!hao!hplabs!sri-unix!REM@MIT-MC
From: REM@MIT-MC@sri-unix.UUCP
Newsgroups: net.space
Subject: Re: sattelites
Message-ID: <3180@sri-arpa.UUCP>
Date: Sun, 24-Jul-83 01:45:00 EDT
Article-I.D.: sri-arpa.3180
Posted: Sun Jul 24 01:45:00 1983
Date-Received: Mon, 18-Jul-83 19:44:39 EDT
Lines: 10

From:  Robert Elton Maas 

Since the link from TDRS-1 to the nearest ground station is
line-of-sight 100% of the time (after all, TDRS-1 is supposed to be
geoSTATIONARY), the link from the ground station to Houston is 100% of
the time via various conventional means, and the link from the orbiter
to TDRS-1 is line-of-sight 50% of the time, I don't see why the
overall duty time is only 20% if TDRS-1 is working.

Perhaps somebody else can explain the calculation for me?