Very good Bernie.? I had forgotten UNO does have an xtal.? Are you using my "cal" mode to get it exactly on frequency?
Since it is a fudge, how well does it keep it over the PTO range?
The ATMega328 has a clocked counter input so it is limited to 6.4MHz with the 16MHz main clock.? Which is fine since the PTO is 5.5MHz max.
It would be good if the counter could go to 35MHz so we could just read the INJ line...? PICs can do that, an outboard PIC is what I have considered.
I don't see how dividing and then multiplying would help...?
73,
Gary
WB6OGD
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Gary WB6OGD