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From: logajan@ns.network.com (John Logajan)
Newsgroups: sci.electronics
Subject: Re: MTS stereo modulation
Keywords: TV MTS stereo cable
Message-ID: <1989Nov22.163530.3425@ns.network.com>
Date: 22 Nov 89 16:35:30 GMT
References: <2095@calvin.EE.CORNELL.EDU>
Sender: news@ns.network.com
Organization: Network Systems Corporation, Mpls., MN
Lines: 21

In article <2095@calvin.EE.CORNELL.EDU> phil@calvin.spp.cornell.edu writes:
>I have an opportunity to purchase a friend's TV.  Being a fairly recent
>TV, it has MTS stereo decoding capability.  However, this feature would
>be useless if my cable company doesn't pass along stereo information on
>those channels it carries.

There are two ways (that I know of) to take a broadcast channel and stick
it on a cable.  One is to simply heterodyne the the broadcast frequency
with another frequency, and the resultant output frequency is injected 
onto the cable (with filtering of unwanted image freqs).  This method is
known as frequency conversion and would leave the MTS signal intact.

The second method is to extract the actual video and audio information
and then remodulate it onto the cable frequency.  You could lose the
MTS information if they were too cheap to buy MTS stereo demo/remod
equipment.  (By the way, I believe this method is called something
like baseband conversion, or something???)

-- 
- John M. Logajan @ Network Systems;  7600 Boone Ave; Brooklyn Park, MN 55428 -
- logajan@ns.network.com, john@logajan.mn.org, Phn 612-424-4888, Fax 424-2853 -