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Old 25th Jun 2018, 12:04 am   #2
julie_m
Dekatron
 
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: Is it possible to do this? (PAL signal)

Each TV set would need a HDMI to composite video adaptor, and also a UHF modulator if it did not have a SCART socket. All the parts you need should be available from the usual places online.

Probably the least cabling would be required if you combined the UHF signals from the two modulators, set for different channels, onto a single coax and then used a simple inductive splitter to feed both sets.

You can generate your own Teletext signals and inject them into an existing video signal using a Raspberry Pi with an adaptor to tap into the video signal. It uses two GPIO pins to monitor the field and line syncs, so it can count the lines after the field sync pulse; and another to switch between the input video signal and a fourth GPIO pin, which carries the actual zeros and ones making up the character codes on the page.
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