Quick question, I want to configure the transmission power of my RAK811v1.2.
I just want to know how to configure it? I know using the the AT command at+set_config=lora:tx_power:0. What does the zero value represents? Is it zero dbm max power? If i want to use the max EIRP of 16dbm for EU868. What AT command should i use?
So with the given values, does it means the command at+set_config=lora:tx_power:0 corresponds to a 16dB power (max for EU868)? And at+set_config=lora:tx_power:7 corresponding to 2dB power?
The max EIRP is what comes after the antenna. When you set a value you have to add the antenna gain. For example:
at+set_config=lora:tx_power:0 will result in 16dB at the antenna port. If you have a 3dBi antenna this will leave you with a total EIRP of 19 (if you are assuming the connector is perfect, you have no antenna line attenuation, etc.)
So basically yes. But keep in mind the antenna gain.
Basically we can say that at+set_config=lora:tx_power:0 is the highest setting for tx power while at+set_config=lora:tx_power:7 would yield the lowest tx power setting? Since 8-15 is reserved future usage. Is this right?
For example, with tx_power =1 that means MaxEIRP- 2dB, so (16 - 2) dBi at antenna port + 2dBi antenna gain = 16 dBi after the antenna, is that correct ?
Or does the MaxEIRP implies a 2 dBi antenna ( such as 14 dBi + 2 dBi antenna gain = 16 dBi final output after the antenna, with tx_power:0 ) ? I got a bit confused