[Hackrf-dev] Analog TV transmitter

[Paul Connolly]

I don't think that anyone has transmitted teletext with the HackRF (yet)
, but I could be wrong ?
Teletext never caught on in the US, so you may have to go to the
standard
http://www.etsi.org/deliver/etsi_i_ets/300700_300799/300706/01_60/ets_300706e01p.pdf

The NTSC flow graph ( https://github.com/argilo/sdr-examples ) had some
modifications done to it and there is now a PAL flow graph (
https://github.com/miek/sdr-stuff )

As for the Audio, it is a separate FM signal ( 25 kHz instead of 75 kHz
used for FM radio station) at an offset to the video carrier. And that
offset is different for a lot of the PAL broadcast systems
(PAL-B/D/G/H/I/K/M/N)
See this for the details for each PAL version:
https://en.wikipedia.org/wiki/PAL#PAL_broadcast_systems
There is a good graphic of the PAL transmission modulation scheme here
https://en.wikipedia.org/wiki/PAL#Colour_encoding
It is very similar to the one for NTSC  (
https://en.wikipedia.org/wiki/NTSC#Transmission_modulation_scheme )
which might be useful for comparison.


On 25/05/2015 07:59, Mitja kocjančič wrote:
> Hi anyone know how I can transmitt PAL with sound and generate Teletext?
>
> I only know how to make simple FM Transmitter not TV one in GNU Radio
>
> So could anybody help me with building GNU Radio PAL with Sound transmitter
>
> you can transmitt ATSC, DVB-T2 but you can't transmitt Analog? (strange)
>
> Thanks for helping and Best regards
>
>
>
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> HackRF-dev at greatscottgadgets.com
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