I have similar problem with Modem HL6548 …
Only Getting all Zeros ‘0’;
My command sequence is as follows - I am using only external antenna with internal LNA…
004.630130 Gprs tx: ATE0
004.633802 Gprs rx: OK
004.633834 Gprs tx: ATE0
004.637421 Gprs rx: OK
11:23: 005.643110 Gprs tx: AT+CCID?
005.646647 Gprs rx:
005.649199 Gprs rx: +CCID: xxxxxxxxxxxxxxxxxxxxxxx
005.649254 Gprs GprsReadSimCardNumber(): xxxxxxxxxxxxxxxxxxxxx
11:26: 009.649112 Gprs tx: AT+CFUN=1,1
009.658188 Gprs rx:
009.658537 Gprs rx: OK
015.148360 Gprs rx: +SIM: 1
015.148377 Gprs GprsStartGPS(): OK
11:36: 019.148143 Gprs tx: AT+GPSINIT=41
019.151974 Gprs rx: AT+GPSINIT=41
019.152572 Gprs rx: OK
11:40: 023.447925 Gprs tx: AT+GPSINIT?
023.451314 Gprs rx: AT+GPSINIT?
023.452530 Gprs rx: +GPSINIT: 41
023.453218 Gprs rx: OK
023.453233 Gprs GprsStartGPS(): OK
11:44: 027.452999 Gprs tx: AT+GPSNMEA=0
027.456805 Gprs rx: AT+GPSNMEA=0
027.457220 Gprs rx: OK
11:48: 031.457005 Gprs tx: AT+GPSPVT=1,10,FFFF
031.461747 Gprs rx: AT+GPSPVT=1,10,FFFF
031.462220 Gprs rx: OK
11:52: 035.462002 Gprs tx: AT+GPSSTART=0
035.465769 Gprs rx: AT+GPSSTART=0
035.466220 Gprs rx: OK
11:56: 039.466002 Gprs tx: AT+GPSCONF=0,0
039.470309 Gprs rx: AT+GPSCONF=0,0
039.470639 Gprs rx: OK
12:00: 043.470421 Gprs tx: AT+GPSCONF=1,2
043.474261 Gprs rx: AT+GPSCONF=1,2
043.474593 Gprs rx: OK
12:04: 047.474376 Gprs tx: AT+GPSCONF=10,0
047.478640 Gprs rx: AT+GPSCONF=10,0
047.478972 Gprs rx: OK
12:08: 051.478771 Gprs WAIT FOR GPS LOCATION : REFERESH RATE IS 10 SECOND…
12:13: 056.218456 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
056.221114 Gprs rx: +GPSPVT:1,000.0deg,000m/s
056.223628 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
056.229671 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
056.235387 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
056.241207 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
056.247206 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
056.252838 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
056.259967 Gprs rx: +GPSPVT:3,8,6,[165,N,0],[90,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
056.267540 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
056.272967 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]
12:23: 066.478179 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
066.478227 Gprs rx: +GPSPVT:1,000.0deg,000m/s
066.478269 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
066.478349 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
066.478434 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
066.478519 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
066.478606 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
066.478689 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
066.478787 Gprs rx: +GPSPVT:3,8,6,[23,N,0],[24,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
066.478894 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
066.478980 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]
12:34: 077.216188 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
077.218580 Gprs rx: +GPSPVT:1,000.0deg,000m/s
077.221184 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
077.227211 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
077.232944 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
077.238753 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
077.244760 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
077.250386 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
077.258153 Gprs rx: +GPSPVT:3,8,6,[165,N,2486],[50341,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
077.265606 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
077.271143 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]
12:44: 087.478179 Gprs rx: +GPSPVT:0,00:00:00,00/00/0000,NO FIX,N 000 00’00.00",E 000 00’00.00",+0000m
087.478227 Gprs rx: +GPSPVT:1,000.0deg,000m/s
087.478269 Gprs rx: +GPSPVT:2,00SV,0.0HDOP,0,0.0
087.478349 Gprs rx: +GPSPVT:3,8,1,[20,N,0],[10,N,0],[22,N,0],[18,N,0],[31,N,0],[27,N,0]
087.478434 Gprs rx: +GPSPVT:3,8,2,[9,N,0],[8,N,0],[19,N,0],[29,N,0],[6,N,0],[17,N,0]
087.478519 Gprs rx: +GPSPVT:3,8,3,[4,N,0],[11,N,0],[2,N,0],[21,N,0],[16,N,0],[28,N,0]
087.478606 Gprs rx: +GPSPVT:3,8,4,[30,N,0],[25,N,0],[26,N,0],[15,N,0],[13,N,0],[14,N,0]
087.478689 Gprs rx: +GPSPVT:3,8,5,[32,N,0],[5,N,0],[7,N,0],[3,N,0],[1,N,0],[12,N,0]
087.478787 Gprs rx: +GPSPVT:3,8,6,[23,N,0],[24,N,0],[22784,N,0],[23040,N,0],[23296,N,0],[23552,N,0]
087.478894 Gprs rx: +GPSPVT:3,8,7,[23808,N,0],[24064,N,0],[24320,N,0],[16384,N,0],[16640,N,0],[16896,N,0]
087.478980 Gprs rx: +GPSPVT:3,8,8,[17152,N,0],[17408,N,0],[17664,N,0],[17920,N,0]
…same pattern repeat at every 10 seconds…
I don’t see any correct data at all. Please Help