Antenna Interfaces; Main/Rx-Diversity Antenna Interfaces; Pin Definition; Operating Frequency - Quectel EC25-AUX Hardware Design

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Antenna Interfaces

EC25 antenna interfaces include a main antenna interface, an Rx-diversity antenna interface which is
used to resist the fall of signals caused by high speed movement and multipath effect, and a GNSS
antenna interface. The antenna ports have an impedance of 50Ω.

5.1. Main/Rx-diversity Antenna Interfaces

5.1.1. Pin Definition

The pin definition of main antenna and Rx-diversity antenna interfaces is shown below.
Table 26: Pin Definition of RF Antennas
Pin Name Pin No.
ANT_MAIN 49
ANT_DIV 35

5.1.2. Operating Frequency

Table 27: Module Operating Frequencies
3GPP Band
GSM850
EGSM900
DCS1800
PCS1900
WCDMA B1
EC25_Hardware_Design
I/O Description
IO Main antenna
AI Receive diversity antenna
Transmit
824~849
880~915
1710~1785
1850~1910
1920~1980
LTE Standard Module Series
EC25 Hardware Design
Comment
50Ω impedance
50Ω impedance.
If unused, keep it
open.
Receive
869~894
925~960
1805~1880
1930~1990
2110~2170
Unit
MHz
MHz
MHz
MHz
MHz
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