L830-EA M.2 Module Hardware User Manual
Page 43 of 45
7.3 GNSS
L830-EA M.2 module supports GPS , GLONASS and aGPS. The antenna with RF Diversity and
GNSS.Through the AT order can open or close the GNSS functions, please reference the AT order
manual.
For Android system, GNSS output by ACM according to the data format of NEMA0183 , and the baud
rate is 115200;
For Win8/8.1/10 system, GNSS output by GNSS Sendor.
Description
Condition
Test Result
Power
GPS fixing
70mA
GPS tracking
70mA
GLONASS fixing
65mA
GLONASS tracking
65mA
Sleep
3.5mA
TTFF
GPS/
GLONASS
Cold start
38s/–130dBm
Warm start
35s/–130dBm
Hot Start
1s/–130dBm (GPS signal powers off 1s)
aGPS
Cold start
1s/–130dBm
Sensitivity
GPS
–158dBm
–160dBm
GLONASS
–157dBm
–158dBm
Note
：
The current of GNSS is testing under the situation of RF disable.
7.4 RF PCB Design
7.4.1 Wiring Principle
L830-EA adopts double RF antennas, the MAIN_ANT used for transmitting and receiving, the DIV_ANT
used for receiving. On the one hand, diversity antenna can improve the receiving sensitivity, on the other
hand, it can also improve the download speed. Because the L830-EA project is for LTE module, the
Antenna need double antennas can meet the performance requirements.
7.4.2 Impedance Design
The impedance of RF signal line of antenna interface needs to be controlled at 50 ohm.
