Reason for GPS problems found!

[ian douglas]

Yaroslav Halchenko wrote:
>> The note attached said:
>> "GPS internal antenna issue appears to respond positively to cranking 
>> RF_3V to 3.6V from 3.0V."
> 
> it is a SNR issue for sure, and to boost SNR you either
> boost signal (which is what voltage raise does) or you reduce noise
> (which what removal of SD card seems to be doing).

Andy submitted another patch within the last day or so that toyed with
the voltage levels of the SD circuitry, but his notes indicate that it's
more to do with data stability than noise/interference with the GPS unit.

-id