@dashie i'm guessing these are just part or section identifiers. the components are already labeled, "Q10" refers to a transistor etc. looking at this there is no doubt as to which component is which and stuff like "R0" is utterly meaningless. could also refer to voltages during various testing phases (Yaesu does this with their schematics)

@purple I had a revelation while trying to sleep and they might be for Receive and Transmit

fun with schematics 

@dashie A seasoned layout designer friend says "I’d only be guessing, but the reverse field text (white on black) suggests they might be measured values (or maybe Spice calculations?) rather than component information.

“R” might be inductive reluctance, or resonance frequency, rather than resistance (although it could be that), and “T” might be time, temperature, transconductance, or even Tickle-me-Elmo. (Who knows what values or parameters these guys feel is worthy?)

Anyway, that’s my guess.

I will also comment that their ground symbol is awful!"

re: fun with schematics 

@porsupah I had a revelation while trying to sleep and they might be for Receive and Transmit
which could make sense, they could have just explained that somewhere, but 🤷‍♀️

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