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Path: utzoo!watmath!clyde!akgua!mcnc!unc-c!dya
From: dya@unc-c.UUCP
Newsgroups: net.news.adm
Subject: Re: satellite broadcast of netnews
Message-ID: <1227@unc-c.UUCP>
Date: Fri, 3-Feb-84 19:59:39 EST
Article-I.D.: unc-c.1227
Posted: Fri Feb  3 19:59:39 1984
Date-Received: Wed, 8-Feb-84 07:46:41 EST
Lines: 32

References: vortex.238



     Are you sure that you want to use the vertical blanking interval with
cheap satellite receivers? Whose video signal are you going to use ? And
$ 1000 dish/TVRO systems are notorious for differential gain/differential
phase errors, IF phase anomalies, df/dt errors (with resulting cycle slipping
in PLL receivers), horrible DC restoration in the vertical interval, and
so on.

     In addition, who is going to give up four lines in the VBI. The easy
way to go is

     1) An aural subcarrier (say 7.2 mHz) with 56 kb/s synchronous or
less -- the implementation is trivial; use a 13 foot dish and receiver
with threshold extension;

     2) A SCPC satellite, with much lower line charges, running digitally.
In this case, the IF bandwidth can be drastically narrowed, saving money
on dish (and permitting a simple receiver/modem.) The cost for VBI stripping
equipment is nontrivial.....

     Performance of $ 1000 and below satellite receiving systems is unacceptable
for plain old video. I don't know what price Lauren was quoting, but even
at the wholesale, 10-99 unit price, the equipment really stinks.

SCPC or 12 gc is the way to go........

--David ( Last of the Analog ) Anthony

akgua!mcnc!(urp,unc-c)!dya