Idea: PIC and DDS for Fix Ch crystal replacement

[N8YX]

Cheaper than a decoder, use the PIC's analog input line, and a resistor ladder. Absent an analog input, you can use a matrix input network (Just cleverly arranged wires).

That's another interesting thought. What is the resolution of the average PIC's analog input -250mV, 500mV, ? I have +5, +9 and +12v to work with in most rigs of that era.