I would recommend a Si5351 synthesizer board with Arduino controller.

Here is an example that is overkill but you will get the idea. I did order Si5351 Synthesizers from Jason it the past

https://www.9h5bm.com/product/avr-gated-gps-locked-frequency-counterstandard

I don't code but if I find one I will send you a link.

Mike N2MS

> On 06/02/2026 7:28 AM EDT Rob Flory via MRCA <mrca@mailman.qth.net> wrote:
>
>
> Zorro, nice repurposing of the medical tin.
>
> I may have to get my TRC-77 out in the field for field Day.
>
> Speaking of the TRC-77 in modern use, I wonder how hard it would be to make an Arduino controller to tune progrocks with external thumbwheels or even knob for kc and thumbwheel for Mc.
>
> I did manage to work a handful of stations with my TBX in the field some years back. I can't remember if I ran the transmitter on the EF generator or on the dynamotors. Probably the latter.
>
> RF
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