Alex Perry writes:
Some units report all three digits, but designers usually want to save
panel space and omit the unnecessary digit. Thus, for example,
the ground control frequency for KMYF is 118.225 MHz but the radio
actually displays 118.22 (a notam recently changed it from 121.9).
Alex Perry writes:
When you turn the big knob, the whole MHz number changes in steps of one.
When you turn the little knob, the fractional MHz number changes,
with the display sequence 00 02 05 07 10 12 15 17 20 ...
corresponding to the freqs 000 025 050 075 100 125 150 175 200
