Xref: utzoo sci.electronics:2541 rec.ham-radio:4273
Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!cornell!batcomputer!garnett
From: garnett@batcomputer.tn.cornell.edu (Roger Garnett)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Television Data Transmission
Message-ID: <4063@batcomputer.tn.cornell.edu>
Date: 16 Mar 88 15:10:17 GMT
References: <533@imagine.PAWL.RPI.EDU>
Reply-To: garnett@tcgould.tn.cornell.edu (Roger Garnett)
Organization: Cornell Theory Center, Cornell University, Ithaca NY
Lines: 40
Keywords: TV Television Transmitter Receiver Radio

In article <533@imagine.PAWL.RPI.EDU> snyderw@pawl18.pawl.rpi.edu (Wilson P. Snyder II) writes:
>
>	Hello, I would like to know if it is possible to make a very
>low power television transmitter.  Here's the catch, it needs to fit
>into a HO Scale model railroad boxcar (About 2" by 5" by 5").
>is needed.  I plan to use a small Semiconductor Imags sensor for the input,
>so the input could be digital (???).  Finally, color is needed.
>	Any help would be welcome.  (The radio signal only needs to make it
>ten feet or so.)
>
Yes! you can. There are some cheap and dirty ways to do it too. Of course
things like this are 'officially' controlled by the FCC...
	If you have a composite vidio signal (output from camera, computer, vcr,
etc), you can feed it in to a rf converter.  Small, cheap rf converters can be 
made with few parts (I don't have details here) but an eaiser way is to use a
converter from a vidio game, home computer, vcr, etc. Any old, dead VIC 20,
sinclair, Atari, or VCR may be a good candidate. There were even some converters
sold seperatly. You can take the output of the converter and feed it to an
antenna of some sort (wire) and pick up the result on a nearby TV.
	Some rf converters are pretty amazing, Back about 15 years ago I fed
the rf output from a Sony Porta-Pac VTR into our TV antenna and then aimed the
camera at our neighbors house. I then went next door to "watch" TV. And what
do you Know, guess what was showing on channel 3? My neighbor couldn't figure
out why his house was a star...
	IF you do this it helps to have channel 3 or 4 unused by a local
station, they would probubly kill your weak signal. And remember you don't
know who might be watching. 
	Also, you can feed audio into some converters as well as vidio.
So, a camera mounted in a model train, huh? Nice ride. I have been noticing
the increase of such subjects-eye-view cameras, in racing cars, those mad
lughe (sic?) sledders in the olympics, etc. So, remember, some where, 
some time, some one may be watching, so smile! you're on candid camera...


   --------          Roger Garnett           (garnett@batcomputer)
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