On Wed, 9 Nov 2011, RANJAN wrote:
Hi,
Does any one know about the OpenMoko GPS chipset pin connection. After I
opened it I could find only one grey wire which appears to be the antenna.
Where are the Vcc,Gnd and Rx-Tx pins?
I guess you mean this part:
http://wiki.openmoko.org/wiki/Disassembling_Neo1973#Removing_PCB_from_case_frame
The grey cable is a 2-wire coaxial cable. I once ripped it off and tried
to re-solder it without success. It is too tiny to handle it with fingers.
The actual antenna is (from my understanding) the big light-brown piece of
plastic in the top of the phone, while the GPS chip is soldered on the
board itself. I think this is so because there is also a second
external GPS antenna connector on the side of the phone. Also, plenty of
shielding metal next to the GPS antenna connector lets me assume, that
there is some high-frequencey electronics working under ;)
I guess it works similair to a TV satelite receiver (LNB) which is also
powered and data-exchanged with a 2-line coax cable.
No idead how they do this technically.
Roughly, there is power and some commands to justify the satelite receiver
to a certain frequency. But IMHO the actual logic to interpret GPS data is
not inside 'that brown plastic piece'.
Alex.
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