Quectel LC79D Hardware Design page 30

GNSS Module Series
LC79D Hardware Design
C1, R1, C2 are reserved matching circuits for antenna impedance modification. By default, R1 is 0Ω, while
C1 and C2 are not mounted. The impedance of RF trace should be controlled as 50Ω and the trace length
should be kept as short as possible.
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