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9	9	= 1.  Overview =
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12	12	In LoRaWAN protocol, the gateway transmit packet uses the output power base on the Power Index from the LoRaWAN server downlink. for example, the LoRaWAN server sends a downlink with this info "rf_power=14", gateway got this info and it will search the index for rf_power=14 and use the related rf setting to set output power. In some cases, the LoRaWAN server might set the rf-power to a quite low value ( for example 0dB) which is not practical for use. In such a case, the User can manually change the rf_power=0's rf settings to a higher power out. Below are the methods.
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15	15	= 2.  Change Power for Semtech UDP Paket forward connection =
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18	18	In LoRaWAN protocol, the gateway output power refers to the downstream packets sent by Gateway. This output power is controlled by the LoRaWAN server.
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20	20	Gateway maintains a power index in the file: /etc/lora/global_conf.json for example:
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23	23	(% class="box" %)
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25	25	"tx_lut_3": {
26	26	"desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
27		- "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
	33	+ "pa_gain": 2,  ~/~/ to the value mentioned here so to generate 15dB output power.
28	28	"mix_gain": 10,
29	29	"rf_power": 15,
30	30	"dig_gain": 1
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38	38	)))
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41	41	(% style="color:red" %)**Note: If when lorawan server specifies a rf_power that is not listed above. gateway will choose the closest power. profile.**
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44	44	When the LoRaWAN server sends a downlink stream, the server will also ask the gateway to use rf_power as output. So users don't need to consider controlling on the gateway side.
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46	46	If users want to always use a higher power or a lower power. Users can modify the pa_gain,mix_gain, and dig_gain to specify rf_power to achieve this purpose. This is not recommended, because this might break the regulator for a specific country.
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48	48	Please note, that the global_conf.json file will be overwritten by the match region files in /etc/lora/cfg-30x when changing settings on the web. So the user needs to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
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51	51	= 3.  Change Power for LoRaWAN Basic Station connection =