problem with Sim908 gps antenna

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marthoma

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hiii....im working with sim908 gps and lpc2148.Im using the antenna prescribed by simcom.however my antenna is taking almost 14 minutes to collect the proper coordinates and time..cud sumone help me with which is the proper antenna to be used.to start the modem im giving the following AT commands
AT+CGPSPWR=1
AT+CGPSRST=0
AT+CGPSINF=2

should i include any other AT command?please help ...
 

could someone please help me here??if you are not clear with my question then please do ask....
 

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