Sunsea AIoT SIMCom SIM7075G User Manual page 44

Galileo L1:1575.42±1.023MHz
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Update rate: Default 1 Hz
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GNSS data format: NMEA-0183
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GNSS Current consumption :54mA (AT+CFUN=0,without USB)
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GNSS antenna: Passive/Active antenna
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NOTE
If the antenna is active type, the power should be given by main board because there is no power
supply on the GNSS antenna pad. If the antenna is passive, it is suggested that the external LNA
should be used.
4.3.2 GNSS Application Guide
Users can adopt an active antenna or a passive antenna to SIM7075G. If using a passive antenna, an
external LNA is a must to get better performance. The following figures are the reference circuits.
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
www.simcom.com
Figure 27: Active antenna circuit
Figure 28: Passive antenna circuit (Default)
SIM7075G User Manual V1.00
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