Change Gateway Power
Introduction
In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
"tx_lut_3": {
"desc": "TX gain table, index 3", // Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
"pa_gain": 2, // to the value mentioned here so to generate 15dB output power.
"mix_gain": 10,
"rf_power": 15,
"dig_gain": 1
},
"tx_lut_4": {
"desc": "TX gain table, index 4",
"pa_gain": 2,
"mix_gain": 10,
"rf_power": 16,
"dig_gain": 0
Note: If when lorawan server specify a rf_power which is not list above. gateway will choose the closest power. profile.
When LoRaWAN server sends a downlink stream, server will also ask the gateway to use which rf_power as output. So user don't need to consider to control in the gateway side.
If user want to always use a higher power or a lower power. User can modify the pa_gain,mix_gain,dig_gain for specify rf_power to achieve this purpose. This is not recommended, because this might break the regulator for specific country.
Please note, that the global_conf.json file will be overwritten by the match region files in /etc/lora/cfg-30x when changing settings in the web. So user needs to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json