User's Manual

Smart Machine Smart Decision
SIM7600SA_User Manual_V1.00 2017-10-11
In above figures, the components C1, L1 and L2 are used for antenna matching. Usually, the values
of the components can only be achieved after antenna tuning and usually provided by antenna
vendor. C2 is used for DC blocking. L3 is the matching component of the external LNA, and the
value of L3 is determined by the LNA characteristic and PCB layout. Both VDD of active antenna
and V_LNA need external power supplies which should be considered according to active antenna
and LNA characteristic. LDO/DCDC is recommended to get lower current consuming by shutting
down active antennas and LNA when GNSS is not working.
GNSS can be tested by NMEA port. NMEA sentences can be obtained through UART or USB
automatically. NMEA sentences include GSV, GGA, RMC, GSA, and VTG. Before using GNSS,
user should configure SIM7600SA in proper operating mode by AT command. Please refer to
related documents for details. SIM7600SA can also get position location information through AT
directly.
Note: GNSS is closed by default and can be started by AT+CGPS. The AT command has two
parameters, the first is on/off, and the second is GNSS mode. Default mode is standalone mode.
AGPS mode needs more support from the mobile telecommunication network. Please refer to
document [24] for more details.