The SX127x has two output pins and they accept different power ranges:
RFO takes -4 to 15 dBm, PA_BOOST 2 to 17. RadioLib picks RFO on its own
below 2 dBm, but above that it has no way to know which pin a board
actually uses, so it defaults to PA_BOOST.
A board wired to RFO_HF whose levels fall in the overlap therefore comes
out of the wrong pin with no error anywhere. ExpressLRS layouts flag this
as "radio_rfo_hf"; the Radiomaster Bandit is one, with radio levels of
[2, 6, 9, 10] sitting squarely in the range both paths accept.
force_rfo passes RadioLib's forceRfo through for both the fixed drive level
and the per-step table. std_init()'s begin() always configures PA_BOOST, so
beginPowerControl() is what moves an RFO board over; nothing transmits in
between.
MUSTARDTIGERFPV
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