[aprssig] ARPS physical layer

Scott Miller scott at opentrac.org
Wed Sep 15 17:36:00 EDT 2010

Yeah, the docs suck and are frequently inaccurate or misleading if you 
can find them at all.  It took me forever just to figure out if the bits 
are sent MSB or LSB first.

Here's a bunch of stuff I learned along the way:



Derek Love wrote:
> I have been scouring the interweb and have so far not found a definitive
> description of the physical layer / air interface of the APRS system. All
> the published info seems to revolve around the Link layer (AX-25) which is
> all well and good, but doesn't let me design a new TNC. Can someone point me
> in the direction of a suitable source of information, please?
> Many thanks.
> Derek Love
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