RUT X11 "No GPS signal"

[Tenere]

Hello all,

I have an X11, firmware RUTX_R_00.07.06.6, modem firmware EG06ELAR04A20M4G (No update available). Wanted to use the GPS function for the first time with Traccar.

GPS is activated:

/etc/init.d/gpsd status
running

gpsctl -seix
0
1970-01-01 01:00:00
0.000000
0.000000

NMEA senteces are looking strange:

cat /dev/ttyUSB1
$GPGGA,,,,,,0,,,,,,,,*66
$GNGNS,,,,,,NNN,,,,,,*1D
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53$GPGGA,,,,,,0,,,,,,,,*66
$GNGNS,,,,,,NNN,,,,,,*1D$GPGGA,,,,,,0,,,,,,,,*66
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00
$GPGGA,,,,,,0,,,,,,,,*66$GNGNS,,,,,,NNN,,,,,,*1D
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00
$GPGGA,,,,,,0,,,,,,,,*66
$GNGNS,,,,,,NNN,,,,,,*1D
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00

Modem seems to work:

cat /dev/ttyUSB2

+CFUN: 1
OK
+QCSQ: "LTE",55,-88,141,-15
+QCSQ: "LTE",55,-88,121,-15
+QCSQ: "LTE",55,-88,143,-15
+QCSQ: "LTE",55,-88,133,-15
+QCSQ: "LTE",55,-88,115,-15
+QNWINFO: "FDD LTE","26201","LTE BAND 3",1300
OK

Device has been rebooted several times.

Disable GPS → reboot.
Enable GPS → reboot

Any help and hints are highly appreciated.

Best regards,

Joerg

[Tenere]

Good morning all,

an update to the strange behaviour.

Tested yesterday early evening (approx. 1900CET) the antenna connections.

• removed and reconnected antenna connector in campervan → no GPS signal
• removed fixed antenna, connected external antenna → GPS fix
• removed external antenna, reconnected antenna in campervan → GPS fix

This morning (0600 CET) I checked the GPS fix.

gpsctl -siex
1
50.707057
2024-03-12 00:18:11
6.718686

The last GPS fix was nearly eight hours old…!

/etc/init.d/gpsd status
running

/etc/init.d/gpsd restart

etc/init.d/gpsd status
running

gpsctl -siex
0
0.000000
1970-01-01 01:00:00
0.000000

Looks like it stuck.

The built-in antenna seems to be ok, otherwise there would be no GPS fix for nearly 3hrs.

Any ideas…?

This behaviour seems really odd.

Regards,

Joerg

[Tenere]

Update 2

A factory reset did (hopefully permanently) the job. Restoring the old config from file didn’t change the behaviour: a GPS fix is shown on the map with an actual time stamp.

Best regards,

Joerg

[Tenere]

Update 3

No luck at all! Short history:

Time
07:53	Reboot RUT X11	GPS fix
08:18:25	last GPS fix	gpsctl -spiex
08:26	gpsctl -spiex still shows last fix at 08:18:25
08:27	restarted gpsd
	gpsctl -spiex shows fix at 1970-01-01 01:00:00	no signal
08:37	gpsctl -spiex still shows fix at 1970-01-01 01:00:00	no signal
08:39	Reboot RUT X11	no signal
08:55	gpsctl -spiex still shows fix at 1970-01-01 01:00:00	no signal

cat $(ubus call gsm.modem0 info | jsonfilter -e '@.gps_port')
$GLGSV,3,1,10,67,34,223,25,78,37,278,,66,,,,86,31,056,,1*40$GPGSV,4,4,13,32,30,307,,1*50
$GPGGA,082415.17,,,,,0,,,,,,,,*44
$GNGNS,082415.17,,,,,NNN,,,,,,*3F
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00
$GLGSV,3,1,10,67,34,223,26,78,37,278,,66,,,,86,31,056,,1*43$GLGSV,3,2,10,77,66,033,,76,23,071,,69,14,338,,87,25,116,,1*72
$GLGSV,3,3,10,85,09,009,,68,45,292,,1*72
$GPGSV,4,1,13,06,10,090,,10,11,272,,11,,,,12,68,240,,1*50
$GPGSV,4,2,13,15,11,177,,17,14,036,,19,35,056,,22,02,061,,1*6B
$GPGSV,4,3,13,23,00,240,,24,65,125,,25,34,246,,28,,,,1*5F
$GPGSV,4,4,13,32,30,307,,1*50
$GPGGA,082416.17,,,,,0,,,,,,,,*47
$GNGNS,082416.17,,,,,NNN,,,,,,*3C
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GLGSV,3,1,10,67,34,223,24,78,37,278,,66,,,,86,31,056,,1*41M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00
$GLGSV,3,1,10,67,34,223,24,78,37,278,,66,,,,86,31,056,,1*41$GPGSV,4,3,13,23,00,240,,24,65,125,,25,34,246,,28,,,,1*5F
$GPGSV,4,4,13,32,30,307,,1*50
$GPGGA,082418.17,,,,,0,,,,,,,,*49
$GNGNS,082418.17,,,,,NNN,,,,,,*32
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GNGSA,A,1,,,,,,,,,,,,,,,*00

I’m completely lost…

Please advise!

Best regards,

Joerg