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I found the cabling much easier if I swap two pins in amunters' standard pinout, swapping PTT Sense and Spot. That makes everything from P1 go to the front panel, and everything from P3 go to the Radio board. PTT Sense is a digital input, so there's no need for it to use an Analog input pin.

Feedback/comments/questions/flames are welcome. :-)

-Mark

Mark,
Thanks for your suggestion - Understand your point to have all wires from
P1 go to the front panel, and wires from P3 to the main board. This would
certainly make wiring easier.

However please note I'm currently working on a next release v1.21 which
will have automatic keyer functionality.
For this we need yet another digital input. The "dit" contact will connect
to the existing "KEY" input (A1), the "dah" contact will connect to pin
D3. D3 is on connector P3, so we will then have yet another wire from P3
going to the front panel.

Once the keyer functionality works well, I'm planning to start a new
release cycle v2.xx which will have digital BFO. For this we will need
some extra modification and wiring which will anyway not be downward
compatible anymore to v1.xx
I believe v2 would be a good moment to rearrange the input/output pins for
easier wiring as you suggested.
For now, as long as we are still in v1.xx, I'd like to keep the pin layout
as is, so as to maintain downward compatibility.

73 Allard PE1NWL