From: Jim Yanik
Subject: Re: Homemade RF Modulator?
Date: Tue, 19 Nov 2002 05:05:27 +0000 (UTC)
Organization: Friends of Lummox
NNTP-Posting-Date: Tue, 19 Nov 2002 05:05:27 +0000 (UTC)
Peter Bennett wrote in
> On 18 Nov 2002 15:02:05 -0800, firstname.lastname@example.org (Jeff Bowles)
>>I would like to insert an NTSC composite video signal (videotext) into
>>my home cable TV setup, so that any TV in the house can tune to the
>>"special" channel and look at the videotext.
>>My budget is near zero, so commercially available RF modulators are
>>not an option for me.
>>I am capable of reading schematics and soldering, however I'm not very
>>good at RF theory or circuit design.
>>Is it feasible to modify an old "ch 3/ch 4" video game modulator to
>>use a cable TV channel much higher up, say anywhere from channel 70 or
>>99? These are empty channels in my community.
> I expect that a Channel 3/4 modulator could fairly easily be modified
> to cover up to Channel 6. High VHF (7 - 13) would be considerably
> more difficult.
> The UHF channels (14 and up), particularly the high end, would require
> a whole new design, and considerable experience with UHF circuit
> design and construction.
Doesn't Ramsey Electronics sell video transmitter modules (kits?)that xmit
on cable freqs?
Jim Yanik,NRA member
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