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Does your rotary encoder put out 5v pulses on an A and a B channel when you spin the dial?

If yours is like the industrial service rotary encoder I plan to install and puts out 5-volt pulses from an A and B terminal, then it's a bit different from the stock encoder.? The stock encoder basically grounds the black (A) and brown (B) lines in "pulse-like" fashion while turning the knob. What we have to do is convert our encoders from a pulsed-output of 5v signals, to perform the pulsed-grounding of live signal lines delivered to it from the radio.

I might suggest taking the brown wire from the Raduino plug and connect it to the Source leg of a 2N7000. Connect the Drain to earth (yellow). The leg of the transistor that remains, the Gate, connects to one output or the other of your new encoder. Now, repeat this transistor make-up for the Raduino's black wire using a second 2N7000.? Connect that equation up to the other output terminal of your encoder.? I don't know if A=A and B=B on your encoder compared to the original, though you'll find out.

Doing this, your encoder's 5v pulses will "instruct" these two FET transistors to momentarily short out the original Raduino signal lines to earth in the same way that the original encoder device momentarily or repeatedly shorts out the black and brown for tuning or for function-selections. In other words, we've reversed the new encoder's output logic to match the old one's logic so that your uBitx sees what it expects to see [and does what it expects it to do].

If tuning goes backward, reverse the "B" and the "A" wires.?And, obviously, remember to? install a separate momentary push button between the red and yellow wires before you end up needing that for radio operating functions in the future

73,

Ted

K3RTA