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 > > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
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