[BBC-Micro] CEEFAX short story contest

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Tue Sep 21 20:26:43 2004

> 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.

Received on Tue Sep 21 2004 - 20:26:43 BST

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