Generate AX. 25 Modem signals with a PIC.

[skimask]

Hi All,
Can you please help me to generate AX 25 protocol with a PIC.
How do you generate the 1200 Hz and 2200 Hz frequencies and the data out on a port with R2R ladder on 4 bits?
I am busy building a Packet Radio modem for HAM use. Packet Radio / APRS Transmissions.
I am a licenced Radio HAM and use PBP.
Thanks my Friends
Pic Toy

FREQOUT...it's all in the manual...but then that's only a one-bit output. Put a filter on the output that's good enough and you shouldn't need a 4 bit ladder...

(Yep...I said it...the manual...unless of course you don't have a manual...)