FONA 3G no GPS Lock

[gdalgliesh]

I finally got around to working with my "Adafruit FONA 3G Cellular Breakout - American version" which sadly took a year to the day from purchase.
Everything working accept the GPS being able to lock.I am using "SMA to uFL/u.FL/IPX/IPEX RF Adapter Cable" and "GPS Antenna - External Active Antenna - 3-5V 28dB 5 Meter SMA" from Adafruit and have soldered BIAS pad.
If I am reading the NMEA output correctly I am seeing 16 satellites which should be more than enough.

What am I missing?

Code: Select all

AT+CGPS?
+CGPS: 1,1

OK
AT+CGPSINFO
+CGPSINFO:,,,,,,,,

AmpI/AmpQ: 1075/1051

Code: Select all

$GPGSV,4,2,16,08,02,323,,10,51,265,,11,,,,12,,,*77

$GPGSV,4,3,16,13,09,036,,14,,,,15,35,054,,16,15,265,*43

$GPGSV,4,4,16,18,74,343,,20,24,059,,21,67,074,,22,,,*49

$GPGGA,150821.1,,,,,0,,,,,,,,*76

$GPVTG,,T,,M,,N,,K,N*2C

$GPRMC,,V,,,,,,,,,,N*53

$GPGSA,A,1,,,,,,,,,,,,,,,*1E

$GPGSV,4,1,16,01,,,,02,,,,05,,,,07,,,*7A

$GPGSV,4,2,16,08,02,323,,10,51,265,,11,,,,12,,,*77

$GPGSV,4,3,16,13,09,036,,14,,,,15,34,053,,16,15,265,*45

$GPGSV,4,4,16,18,74,343,,20,24,059,,21,67,074,,22,,,*49

$GPGGA,150822.1,,,,,0,,,,,,,,*75

$GPVTG,,T,,M,,N,,K,N*2C

$GPRMC,,V,,,,,,,,,,N*53

$GPGSA,A,1,,,,,,,,,,,,,,,*1E

$GPGSV,4,1,16,01,,,,02,,,,05,,,,07,,,*7A

$GPGSV,4,2,16,08,02,323,,10,51,265,,11,,,,12,,,*77

$GPGSV,4,3,16,13,09,036,,14,,,,15,35,054,,16,15,265,*43

$GPGSV,4,4,16,18,74,343,,20,24,059,,21,67,074,,22,,,*49

$GPGGA,150823.1,,,,,0,,,,,,,,*74

$GPVTG,,T,,M,,N,,K,N*2C

$GPRMC,,V,,,,,,,,,,N*53

$GPGSA,A,1,,,,,,,,,,,,,,,*1E

[gdalgliesh]

Well I know have a lock not sure why since I had left it over night and didn't lock but maybe a pwr cycle I did sorted it. Will see if it is reliable from hear forward.

Thanks

[Khush]

I have the same problem with my Fona 3G. Not getting any GPS lock. So can you post the power circuit and pictures of soldered BIAS here?

[adafruit_support_mike]

Just toggle the KEY pin to GND for 2 seconds to turn the FONA off, then again for 2 seconds to turn the FONA back on.