We are developing a GPS+LTE project based on the LE910S1-EAG module. We use a GPS LNA NJG1159PHH and an ACAG0301-1575 GPS antenna.
In this module GNSS_LNA_EN is left open and GNSS_ANT_RF_OUT is connected to pin R9 if the GPS LNA.
NJG1159PHH is powered by 1.8 V and VCTL is also connected to 1.8 V.
The antenna is connected to ground and L2, L4 junction. The antenna matching circuit is obtained from the ACAG0301-1575 datasheet. The antenna has two metal pads and has three connections in the datasheet. The ground here also is connected to the power supply ground.
When we powered up the module we are able to see the NMEA output from the UART and it doesn't contain any valid GNSS or other values:
$GNGGA,,,,,,0,00,99.99,,,,,,*56
$GNGLL,,,,,,V,N*7A
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1*33
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,4*36
$GPGSV,1,1,00,0*65
$GBGSV,1,1,00,0*77
$GNVTG,,,,,,,,,N*2E
$GNRMC,,V,,,,,,,,,,N,V*37
$GNGGA,,,,,,0,00,99.99,,,,,,*56
$GNGLL,,,,,,V,N*7A
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1*33
$GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,4*36
$GPGSV,1,1,00,0*65
$GBGSV,1,1,00,0*77
$GNVTG,,,,,,,,,N*2E
$GNRMC,,V,,,,,,,,,,N,V*37
