[aprssig] Packet Radio Tone Generation

[Andrew Rich]

Howdy,

Working the numbers for 1200 Baud packet generation using a PIC.

Does this look right ?

1200 Baud = 1200 possible symbol changes per second

1 Symbol change possible every 833 uS

Tones used are 1200 Hz and 2200 Hz

How then does 1200 and 2200 fit into the scheme ?

Does one cycle of 1200 Hz equate to enought for one symbol ?

2200 does not seem to fit cleanily assuing zero crossing

Cheers Andy VK4TEC