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[aprssig] ARPS physical layer

ka7o at ka7o.net ka7o at ka7o.net
Wed Sep 15 16:40:56 UTC 2010

Check out:

1200 bps FSK full duplex CCITT V.23
Stated in the KPC3+ spec sheet as it's 'modulation'.

CCITT is now "ITU" - a google search for ITU V.23 yields:

That what you're looking for?


> 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
> Registered Office- Oval Park. Hatfield Road. Langford. Maldon. CM9 6WG
> Registered in England and Wales. Registered No. 02847065. VAT No. 368 6007
> 36
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