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[aprssig] Packet Radio Tone Generation

Andrew Rich vk4tec at tech-software.net
Sat Dec 18 11:12:04 UTC 2004


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





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