We have a simple setup with one indoor gateway RAK7258 and two RAK811 Breakout Board end-nodes. The first end-node is near the gateway (a couple of meters) and sends regularly uplink messages to the RAK7258’s built-in app server, which in turn transmits data (downlink messages) to the second end-node. We are testing this in urban environment, but in a district with rather smal buildings, lot of free space everywhere. As such, we are expecting ranges of at least 1,5-2 km. Instead we’ve got 500-700 meters so far as the best result.
Here are some parameters of the devices:
RAK7258 - 868 Mhz, Tx power 14 Dbm, DR0 (SF12BW125), ADR off, 869.525 MHz SF9BW125 (RX2 downlink only)
RAK811 - 868 Mhz, DR0 (SF12BW125), ADR off.
We use default antennas that were delivered with the devices.
The question is, how to improve the range? Any suggestions, please!