Wiki source code of Change Gateway Power
Version 5.1 by Edwin Chen on 2022/06/20 17:43
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| author | version | line-number | content |
|---|---|---|---|
| 1 | = Introduction = | ||
| 2 | |||
| 3 | ---- | ||
| 4 | |||
| 5 | In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server. | ||
| 6 | |||
| 7 | Gateway maintain a power index in the file: /etc/lora/global_conf.json for example: | ||
| 8 | |||
| 9 | |||
| 10 | (% class="box" %) | ||
| 11 | ((( | ||
| 12 | "tx_lut_3": { | ||
| 13 | "desc": "TX gain table, index 3", ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain | ||
| 14 | "pa_gain": 2, ~/~/ to the value mentioned here so to generate 15dB output power. | ||
| 15 | "mix_gain": 10, | ||
| 16 | "rf_power": 15, | ||
| 17 | "dig_gain": 1 | ||
| 18 | }, | ||
| 19 | "tx_lut_4": { | ||
| 20 | "desc": "TX gain table, index 4", | ||
| 21 | "pa_gain": 2, | ||
| 22 | "mix_gain": 10, | ||
| 23 | "rf_power": 16, | ||
| 24 | "dig_gain": 0 | ||
| 25 | ))) | ||
| 26 | |||
| 27 | |||
| 28 | 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. | ||
| 29 | |||
| 30 | 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 recommend, because this might break the regulator for specify country. | ||
| 31 | |||
| 32 | Please note, the global_conf.json file will be overwrite by the match region files in /etc/lora/cfg-30x when change settings in the web. So user need to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json |