LORA TX POWER Setting - Absolute or relative

Support
1

HI, noob here.
I’m looking into how to improve SNR of my setup using Preamps, SAW filters etc. Many of these devices have thru PMax ratings of 20dBm or so, which I am keen to observe!
Questions:

  1. is the Settings/Lora TX Power setting an absolute figure which sets a current limit for the onboard TX PA section, probably derived from a table for each device type?
    In other words, for my SX1262, capable of max 22dBm do I set Lora TX Power to 20dBm to limit to 20dBm?
    Or

  2. is the setting relative to the maximum TX Power allowed by the Region parameter?
    Eg EUR-868 sets TX Pwr to 27dBm even though the SX1262 can only deliver 22dBm, so to limit actual output to 20dBm the value to set would be ((27/22) x20 ) =24.5?

  3. How accurate will the set TX Power output limit be in percentage terms?

TIA for any help!
Dai

2

The firmware will set it to the minimum of what you configure, the regional limit and what the radio is capable of.

1 Like
3

Many thanks for the swift, clear and succinct response, much appreciated! :blush: