Handle non-linear relationship between TX_POWER and output power #887
Description
Currently, it's somewhat unclear what output power we'll actually get when setting a power setting, if the radio has an LNA or amp or is otherwise not directly corresponding to the output power setting.
This issue is a request mainly to solve this in a proper way, since there are reasonable workarounds currently (primarily: document the behavior and the proper setting for each radio, and ensure users know what the actual output will be).
The radio that brings this up is of course the Heltec V4, which despite a setting of 22dBm, will actually output ~28dBm. But other radios are also impacted, such as the common Station G2.
A proper way to handle would be to have a scale of real-output-power::tx-power-setting that maps it, so that the UI can display (and the command line setting can accept) radio power that corresponds to the actual output for that radio.
For ex:
| Real Power | TX Power Setting |
|---|---|
| 27 | 22 |
| 25 | 21 |
| 24 | 20 |
| ... | ... |
| 3 | 2 |
| 2 | 1 |
This is how the other app is handling it (their PR #8107), and I think it's kind of convenient for users to be able to think in terms of how much power will actually be output.
Not a huge deal, but it has caused quite a bit of confusion when people see a lower number (especially "10", which is incorrect and should be able to be worked around with #885) and then come asking why they're not able to set their fancy new power amp radio to the power they want. This or something like it would help reduce those questions and the confusion.