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Article #1539

Re: Upconverter or modulator for cable TV freqs

#1539
From: William Moss
Date: Tue, 21 Jul 1992 21:34
33 lines
2545 bytes
In article <1992Jul21.183246.8595@elroy.jpl.nasa.gov>, cyamamot@marconi.Jpl.Nasa.Gov (Cliff Yamamoto) writes:
|> Greetings!
|> 
|> We have a cable TV descrambler (from the Cable Co of course) and it has both
|> ch3 and video/audio outputs.  The video/audio is used to feed the VCR input
|> and TV's *SINGLE* video/audio comes from the VCR.  We only subscribe to one
|> of the 8-10 movie/special channels.  Currently, there is a A/B switch to
|> switch the TV input from the box output to the cable drop (since the TV is
|> cable ready and picks up the basic cable service anyway).
|> 
|> It is kinda annoying to switch that A/B box all the time.  The cable system
|> runs from ch2 to ch60.  The rest are unused.  It would be nice to upconvert
|> the box's ch3 to something above ch60.  Or take the video/audio outputs and
|> modulate it to something above ch60.  Is something like this buildable or
|> available in the market?
Yes. Several companies (Phillips, Radio Shack) market cable to UHF upconverters,
in the $20-$30 range. Theyre not so great for the purpose for which they were
designed (they suffer from intermodulation from alternate channels), but
they work just fine upconverting the single channel 3 output from a VCR
or converter.

Just hook one up to the output of your converter, and combine it with the
cable drop. Depending on your TV tuner type, you'll be able to see the channel
3 output somehere in the range of UHF channel 35-40, or cable channel 70-90
(it depends on how your cable channels are numbered on the TV). You may
have to do some fiddling on your TV's AFC, since the cable mode channels
and UHF channel allocations differ by up to 2MHz.)

-- 
===========================================================================
William G. Moss                      disclaimer: not the views of BNR or NT
Bell-Northern Research Ltd., Ottawa  +1 613 763 8108 WILLIAM@BNR.CA  
===========================================================================
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Message-ID: <1992Jul21.213415.23824@bmerh85.bnr.ca>
Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!convex!news.utdallas.edu!corpgate!bnrgate!bmerh85!bcarh472!william
References: <1992Jul21.183246.8595@elroy.jpl.nasa.gov>

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Newsgroups: sci.electronics,rec.video,rec.video.cable-tv
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From: william@bcarh472.NoSubdomain.NoDomain (William Moss)
Subject: Re: Upconverter or modulator for cable TV freqs
Message-ID: <1992Jul21.213415.23824@bmerh85.bnr.ca>
Sender: william@bcarh472 (William Moss)
Organization: Bell Northern Research, Ottawa, Ontario Canada
References:  <1992Jul21.183246.8595@elroy.jpl.nasa.gov>
Date: Tue, 21 Jul 92 21:34:15 GMT
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