Station G2

[neilhao]

SOC

ESP32

Lora IC

SX1262

Product Link

https://wiki.uniteng.com/en/meshtastic/station-g2

Description

Meshtastic Mesh Device Station G2 is an upgraded design of Station G1, using the latest ESP32 S3 MCU. As an RF research project, Station G2 also brings key updates in RF. The primary RF design goal of Station G2 is to improve the Lora receiving sensitivity by about 4dB based on a dedicated Ultra-Low Noise Figure LNA. And to increase the transmit power and improve Signal to Noise ratio of short data packets by designing the Fast-Transient DC-DC for 35dBm Lora PA.

For Lora Power Amplifier, the 1 dB Compression Point (P1dB) is 35 dBm (3.16 W), and the maximum RF output power is 36.5 dBm (4.46 W) for US915 and 37 dBm (5 W) for EU868.

Station G2 has a rugged SMA antenna socket and rich external IO interfaces. It can be powered by either 15VDC USB Type C PD protocol or 9VDC-19VDC External Power Supply. These features make Station G2 ideally suited as a Fixed-Location Base Station or Vehicle-Mounted Base Station.

Features Comparison of Station G2 and Station G1

Editions	Station G2	Station G1
Core Research Areas	Ultra-Low Noise Figure LNA for LoRaFast-Transient DC-DC for LoRa PA	Modern Cost-Effective RF Power Amplifier RF Components/Materials Measurement and Modeling
Product Status	ACTIVE	OBSOLETE
Current Hardware Version	18 Jan 2024	20 Sep 2022
Initial Release Date	18 Jan 2024	12 Jun 2022
Lora RF Max Output Power	Up to 35 dBm (P1dB Point)	Up to 35 dBm (Maximum RF Output Power)
Frequency Reference for Lora	32MHz TCXO (+-1.5 ppm)	32MHz XTAL (+-10 ppm)
Lora Ultra-Low Noise Figure LNA	Typical Gain: 18.5 dB, Typical Noise Figure: 1.8 dB	-
Fast-Transient DC-DC for LoRa PA	Transient Response Time < 18us, Maximum Transient Voltage Deviation < 275mV, Phase Margin > 66.73 Degrees, Ripple < 30mV, Test Condition: [email protected] Dynamic Test, Input Voltage 15VDC	-
LoRa Transceiver	SX1262	SX1262
Lora Operation Frequency	US915MHz / EU868MHz	US915MHz / EU868MHz
MCU	ESP32 S3 (Flash: 16MB, PSRAM: 8MB)	ESP32 (Flash: 4MB, PSRAM: -)
WIFI	YES	YES
Bluetooth	v5.0	v4.2
Satellite Navigation	Optional (1x GROVE GPS Socket)	Optional
USB Connector	Type C (PD Protocol)	Type C (PD Protocol)
Screen	1.3 Inch OLED Screen	1.3 Inch OLED Screen
Battery	-	Optional 12V Battery Docker
Power Input Socket	15VDC USB Type C PD protocol, 1x5P Pitch=1.5mm Socket (9VDC-19VDC External Power Supply)	USB Type C, 1x2P Pitch=2.5mm Socket
LoRa Antenna	SMA Socket	SMA Socket
Accessories	1x GROVE GPS Socket, 1x GROVE I2C Socket, 1x SparkFun QWIIC I2C Socket and 1x IO Extension Socket	1x IO Extension Socket
Typical Scenarios	Fixed-Location Base Stations and Vehicle-Mounted Base Stations	Fixed-Location Base Stations and Vehicle-Mounted Base Stations