EDATEC ED-GW1303S-915M LoRaWAN Gateway Module (SX1303, 915MHz, mini PCIe)

This module requires a host system with an SPI master interface, such as a Raspberry Pi (using a mini PCIe to USB or GPIO adapter board), a Raspberry Pi Compute Module 4 on a carrier with PCIe, or any microcontroller with an SPI peripheral. The host runs the packet forwarder software (e.g., Semtech's packet forwarder) and communicates with the module's SX1303 chip via SPI to configure channels and manage LoRa packets. A 3.3V power supply capable of delivering over 300mA during transmission is also necessary.

Channel configuration is performed by the host processor via SPI commands. You must run a compatible LoRaWAN packet forwarder software (like the Semtech UDP Packet Forwarder) on your host. This software uses a configuration file (global_conf.json) where you define the US915 frequency plan, data rates, and channel masks. The software then sends the appropriate register writes over SPI to the SX1303 IC on the module to set up the 8x multi-channel receivers and the single LoRa packet transmitter.

This specific model (ED-GW1303S-915M) is hardware-configured and certified for the US915 frequency band (902-928MHz). The product description notes support for both US915 and EU868, but the part number indicates a 915MHz variant. For EU868 operation, you would need the corresponding EU868 version of the module (likely an ED-GW1303S-868M). The RF matching network and certification are band-specific, so using this US915 module on EU868 frequencies is not recommended and would likely violate regulatory standards.

The GPS_PPS (Pulse Per Second) input pin allows you to connect an external GPS module's PPS output. When enabled in the gateway software, this provides a precise, atomic-clock-derived timing reference. This enables the gateway to timestamp received LoRa packets with microsecond accuracy, which is crucial for features like LoRaWAN Class B beacon scheduling, Fine Timestamping for geolocation services (like LoRa Cloud), and synchronizing multiple gateways in a network for Time Difference of Arrival (TDoA) localization algorithms.

You should use a LoRa-specific antenna tuned for the US915 band (902-928MHz) with a UFL (IPEX) male connector. The antenna should have an impedance of 50 ohms and a gain suitable for your coverage needs (typically 3-5 dBi for omni-directional use). Simply attach the antenna's UFL connector directly to the module's UFL RF port. Ensure the antenna is placed away from metal obstructions for optimal performance. For permanent installations, you may use a UFL to SMA pigtail cable to connect to a larger external antenna with an SMA connector.