lucianors
Posts: 1
Joined: Mon Mar 18, 2013 6:59 pm

I2C DVB-S2 tuner

Mon Mar 18, 2013 7:09 pm

Hello.

I'm just starting to explore the features of Raspberry GPIO. I've got an unused linux based DVB-S2 setop box with 2 tuners, so i started to wonder if it would be barely possible adapt those tuners to be used on Raspberry.
Opening the stb, i have found two small tuners from EARDATEC soldered with 10 pins on the board each. The information i found about the tuners on manufacturer website was that they claim to be controller by "I2C BUS".

Do you guys think that there's a possibility to make something like this to work?

Thanks

pgman
Posts: 22
Joined: Sun Jan 06, 2013 8:34 pm

Re: I2C DVB-S2 tuner

Tue Mar 19, 2013 1:57 am

Assuming you mean to use these as satellite tuners for a Pi media centre, then not good.

Firstly, you need to know what the control protocol is. Looking at the company web site there's precious little info on the DVB-S2 tuners, and what there is looks wrong (Input frequency range:48to860MHz - this should be 950-2150 MHz for DVB-S/S2). There are no technical docs, just compliance info. If you can identify the exact model / part no for the tuners, you 'may' find a bit more info from a forum or group on the web, failing that you'd have to contact the company direct. Given that the most recent dated post on their site is May-2009, you may find they've moved on to other things.

Secondly, I2C can only control the tuning parameters to the tuner - its just not fast enough for video. The ouput will most likely be a 44Mhz (ish) I/F signal that you have to process. You'd need to decode, split and de-scramble the stream all on the Pi, this is not a simple task (you're talking encryption hacking here, which needs a bit more power that the Pi has).

Try searching the web for the model of STB you have though, you may find someone has already hacked it, and found a way to do something with the signal.

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