pub const PILOT_SYMBOL_INTERVAL: usize = 32;Expand description
Pilot interval: every PILOT_SYMBOL_INTERVALth transmitted
symbol after the preamble is a known pilot, the rest are data.
32 means 1 pilot per 31 data → ~3.1 % overhead, comfortable
margin against 10 Hz Doppler at 1200 baud (coherence time ≈
100 ms = 120 symbols, so a pilot every 32 symbols is well
inside the coherence interval).