@joerg_rw
ok, i'm happy to collect any information to evalulate the feasibility of an sdr directly onboard because i'm sure this will open a new entire universe of functions and possibilities for the Neo900.
But... about the pcb space required, do you think there is a place also for this option?
One more think to evaulate is some kind of pcb separation/shielding for the sdr antenna connections.

@peterleinchen
i don't think that the antenna obtained from the earphone cable would be a good solution for both dvb-t and generig sdr usage. (signals too weak and too much inteferences)
In my opinion, something like an MS147 antenna connector would be more appropriate.


PS.
At this moment, i'm playing with sdr to receive the signals of my weather station sensors with rtl_433 (https://github.com/merbanan/rtl_433) to read temperature and humidity directly from the phone.
World is....wireless