Quectel EC21 Series User Manual

LTE Standard Module Series
EC21_Series_Hardware_Design
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4.2. GNSS
4.2.1. Antenna Interface and Frequency Bands
EC21 series includes a fully integrated global navigation satellite system solution that supports GPS,
GLONASS, BeiDou (COMPASS), Galileo and QZSS.
EC21 series supports standard NMEA-0183 protocol, and outputs NMEA sentences at 1 Hz data update
rate via USB interface by default.
By default, EC21 series GNSS engine is switched off. It has to be switched on via AT command. For
more details about GNSS engine technology and configurations, see document [5].
The following tables show the pin definition and frequency specification of GNSS antenna interface.
Table 38: Pin Definition of GNSS Antenna Interface
Pin Name Pin No. I/O Description Comment
ANT_GNSS 47 AI GNSS antenna
50 Ω impedance.
If unused, keep it open.
Table 39: GNSS Frequency
Type Frequency Unit
GPS 1575.42 ±1.023 MHz
GLONASS 1597.5–1605.8 MHz
Galileo 1575.42 ±2.046 MHz
BeiDou (COMPASS) 1561.098 ±2.046 MHz
QZSS 1575.42 MHz

Quectel EC21 Series Specifications

General

Brand	Quectel
Model	EC21 Series
Category	Control Unit
Language	English