[linux-dvb] How to turn off +5V supply on AirStar2

e9hack e9hack at googlemail.com
Sun Oct 8 15:09:30 CEST 2006


Klaus Schmidinger wrote:
> Found the manual at
>
> http://82.171.205.59/downloads/dvb/Datasheets/ICs/MT352_DesignManual_Aug04.pdf
>
>
> but unfortunately it doesn't say anything about the antenna supply
> voltage...
>
> Maybe the MT352 wasn't the right lead after all, so any ideas
> would still be welcome.
>
I think, you will found nothing about the antenna supply in the spec of
the demodulator (MT352) or the pll (TSA5523M). If the card has
implemented a switchable supply, they will use one of the GPIO-Pins
(GPP3 from MT352 or P0..P7 from TSA5523M). The band switch bytes for the
pll are 0x09 (VHF low), 0x0a (VHF high) and 0x08 (UHF). Possible, P3
(bit 3) is where you are searching for.

- Hartmut



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