"My" AVR 1200 9k6 Modem

Schematics 1 of 2 (digital)
Schematics 2 of 2 (analog)
Layout,  all .)
Spezial Firmware (for TNC3/4 no startdelay!)
 

and the prototype

Other Pictures
1
2

Known Errata V 1:
Schematics : PTT-Led inverted

Layout:
PTT-Led R18 must be on ICe Pin 10
R34 Pin 2-3 swapped !!
 

please notice:
Original design by G4XYW
 

if you are interested in more, please email to DH9UAN!
 

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