L10 Hardware Design
4 Antenna interface and supervisor
The L10 module receives L1 band signal from GPS satellites at a nominal frequency of 1575.42MHz.
The RF signal is connected to the RF_IN pin. Customer should use a controlled impedance transmission
line of 50 Ohm to connect to RF_IN.
4.1 Antenna
The L10 module can be connected to passive or active antenna. In the default operation mode the
antenna supervisor is activated and enables the receiver to detect short-circuit at the antenna port by
checking the bias voltage level and can shut down the voltage bias immediately when short-circuit
happens. NMEA messages are provided to report the condition of the antenna supply. Open-circuit
detection can also be supported with an additional external circuit. The reference design of the external
circuit is shown in Figure 11.
Figure 11: External detect circuit for open-circuit of active antenna
Table 13: Pin definition of the
AADET_N
Name
Pin
Function
AADET_N
20
Active antenna detect input
L10_HD_V1.01
- 23 -
Quectel
Confidential
