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Details on AX.25 and APRS



Would anyone be able to point me towards some specs for a "standard" 
AX.25/APRS physical layer?

I've assumed FSK, and 144.390(or 445.925), but I'm stumped by the coding 
scheme at the moment - does everyone use manchester or NRZ or something 
else?

Thanks in advance,
Daniel VA3DRF/VK2TRG
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