GPS & NMEA strings

Product Discussion Pepwave MAX
1

Hello,

I have several MAX TST modems and I get regular NMEA sentences from 2 of these modems (on 60660 port).

On one of these two modems, regularly (a few hours after switch it on or reboot him) some of the NMEA informations are missing :

$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53
$GPGSV,3,1,10,05,50,198,,07,07,060,,08,01,026,,13,72,334,*72
$GPGSV,3,2,10,15,40,300,,20,,,,21,06,306,,24,09,248,*49
$GPGSV,3,3,10,28,52,098,,30,38,056,*7F
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53
$GPGSV,3,1,10,05,50,198,,07,07,060,,08,01,026,,13,72,334,*72
$GPRMC,,V,,,,,,,,,,N*53
$GPGSV,3,1,10,05,50,198,,07,07,060,,08,01,026,,13,72,334,*72
$GPGSV,3,2,10,15,40,300,,20,,,,21,06,306,,24,09,248,*49
$GPGSV,3,3,10,28,52,098,,30,38,056,*7F
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53
$GPGSV,3,1,09,05,50,198,,07,07,060,,08,01,026,,13,72,334,*7A
$GPRMC,,V,,,,,,,,,,N*53
$GPGSV,3,1,10,05,50,198,,07,07,060,,08,01,026,,13,72,334,*72
$GPGSV,3,2,10,15,40,300,,20,,,,21,06,306,,24,09,248,*49
$GPGSV,3,3,10,28,52,098,,30,38,056,*7F
$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53

It works fine on the other modem:

$GPVTG,40.0,T,43.3,M,0.0,N,0.0,K,A*23
$GPRMC,170328.0,A,4721.081527,N,00205.908432,W,0.0,40.0,081119,3.4,W,A*33
$GPGSA,A,2,05,13,15,20,21,24,28,,,,,,0.9,0.7,0.7*34
$GPGSV,3,1,10,05,43,188,37,07,04,060,21,08,03,023,27,13,79,352,42*7A
$GPGSV,3,2,10,15,48,296,46,20,06,322,25,21,10,300,38,24,12,246,46*73
$GPGSV,3,3,10,28,49,097,28,30,35,060,21*7B
$GPGGA,170329.0,4721.081527,N,00205.908432,W,1,07,0.7,22.9,M,48.0,M,,*7F
$GPVTG,40.0,T,43.3,M,0.0,N,0.0,K,A*23
$GPRMC,170329.0,A,4721.081527,N,00205.908432,W,0.0,40.0,081119,3.4,W,A*32
$GPGSA,A,2,05,13,15,20,21,24,28,,,,,,0.9,0.7,0.7*34
$GPGSV,3,1,10,05,43,188,38,07,04,060,23,08,03,023,28,13,79,352,42*78
$GPGSV,3,2,10,15,48,296,46,20,06,322,26,21,10,300,38,24,12,246,46*70
$GPGSV,3,3,10,28,49,097,29,30,35,060,21*7A
$GPGGA,170330.0,4721.081527,N,00205.908432,W,1,07,0.7,22.9,M,48.0,M,,*77
$GPVTG,40.0,T,43.3,M,0.0,N,0.0,K,A*23
$GPRMC,170330.0,A,4721.081527,N,00205.908432,W,0.0,40.0,081119,3.4,W,A*3A
$GPGSA,A,2,05,13,15,20,21,24,28,,,,,,0.9,0.7,0.7*34
$GPGSV,3,1,10,05,43,188,38,07,04,060,21,08,03,023,28,13,79,352,42*7A
$GPGSV,3,2,10,15,48,296,46,20,06,322,25,21,10,300,38,24,12,246,45*70
$GPGSV,3,3,10,28,49,097,30,30,35,060,21*72
$GPGSV,3,1,10,05,43,188,38,07,04,060,22,08,03,023,28,13,79,352,42*79
$GPGSV,3,2,10,15,48,296,46,20,06,322,26,21,10,300,38,24,12,246,45*73
$GPGSV,3,3,10,28,49,097,30,30,35,060,21*72
$GPGGA,170332.0,4721.081527,N,00205.908432,W,1,07,0.7,22.9,M,48.0,M,,*75

Do you have any ideas or explanations?
Firmware use is 8.0.1

thanks in advance

2

Check the GPS antenna, it’s cable and make sure it’s tightly screwed on. Empty NMEA strings are typically caused by lack of signal / reception issues.

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