[aprssig] ARPS physical layer

[Phil N6TCT]

Nice!  I've always wondered why, by ear, the preambles of packets from
some TNCs sound different than those from other TNCs!

Phil

John Hansen wrote:
> [...] The bytes you have before the address are the 7E flags.  In
> addition, you'll find that many TNC's idle during the TXDelay period
> using 00's instead of 7E's.