21 Sep
2004
21 Sep
'04
1:26 p.m.
you could in fact quite legally broadcast a teletext signal from a small
transmitter if you are capable of building one, you MUST be careful however
Some of the better TV test generators now include a few teletext pages --
there was a review of one in this month's 'Television' magazine which
costs a bit over 100 quit and which will output 4 teletext pages along
with the normal 'test card' video image.
It can't be that hard to make a teletext generator, actually. When I get
my ACW working, and the Morley teletext decoder hooked up to it, I might
have a go at making a generator.
to make sure that you get no spurious emissions and
also dont use an aerial
but a coax feeder between the tx and the tuner. (IE link it up exactly as
you would a TV).
I wonder if the stnadard video modulators would have enough video
bandwidth for this. I know of at least one device which used such a
modulator without an audio input, and generated the 6MHz sound
intercarrier with a separate oscillator, mixed it with the video and fed
it into the modulator. It worked. So you might get away with feeding in
teletext data too.
-tony