Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP 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