Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version VT1.00C 11/1/84; site vortex.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!vortex!lauren
From: lauren@vortex.UUCP (Lauren Weinstein)
Newsgroups: net.video
Subject: Re: Teletext -- decode in Radio Electonics
Message-ID: <901@vortex.UUCP>
Date: Mon, 24-Mar-86 16:15:00 EST
Article-I.D.: vortex.901
Posted: Mon Mar 24 16:15:00 1986
Date-Received: Tue, 25-Mar-86 05:26:49 EST
References: <137@hp-sdd.UUCP>
Organization: Vortex Technology, Los Angeles
Lines: 27

The Radio Shack teletext kit is (I believe) for the World Standard
for-the-public teletext magazine such as the ELECTRA magazine on WTBS.
This is not the same as the system used by CBS, nor is it the same as the 
system used for the high speed interleaved/encoded data channels on 
WTBS used for Stargate.  The kit is ONLY useful for receiving the
public teletext magazine, and, being heavily LSI'd, cannot be modified in any
reasonable manner.

I don't know if the kit includes a decent cable demod or not--if it
doesn't that is a significant cost to consider unless you plan to feed
the kit video from another demod source (like a VCR) -- this may work
if properly tuned but can be very unwieldy.

Commercial versions of a teletext magazine decoder for the World
Standard are available for around $300.

--Lauren--

P.S.  For most vertical interval data systems, a teletext magazine
takes up some number of full lines.  On WTBS, A couple of lines
are devoted to ELECTRA, and a bunch more lines are devoted
to the commercial high speed/encoded data system (which is totally
different than the teletext magazine and much more sophisticated).
Closed captioning lives on line 21 and is separate from all the other
materials.

--LW--