[Hackrf-dev] Analog TV transmitter

[Mitja kocjančič]

Thanks I try transmitting audio but I don't know how to set offset to 5.5
Mhz for PAL B/G (Video works fine) and don't know how to set devitation to
25 khz (should I use NBFM Modulator block or WBFM Modulator block

PS: How to encode Video in PAL? (any command in VLC (like in DVB-T where
you can encode MPEG 4 with it)
PPS: Is posible to encode and transmitt in real time (I start a movie in
VLC then Video get encoded and Audio get transmitted using GNU Radio (can I
use stdin and stdout pipes to fed encoded Video and Audio to GNU Radio?)

Thanks for Anwsering and Best Regards

2015-05-26 5:25 GMT+02:00 Paul Connolly <eeipcy at gmail.com>:

>  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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