[R-390] R-390 VFO Question

Barry Scott 72volkswagon at gmail.com
Sun Sep 15 22:23:06 EDT 2024


Looking at the simplified schematic for the 3rd mixer (V205), the output
from the 2nd mixer (V204) tunes from 3 to 2 MC and the VFO tunes from 3.455
MC to 2.455 MC yielding a constant 455 kc mixer product.  Is it correct to
interpret those numbers to mean that if the counter starts at XX  000 and
the KC control is rotated CW to XX +000 the VFO's output frequency starts
at 3.455kc and falls 1000 kc for 10 turns CW on the KC knob?

I'm asking because I want to know what the frequency of the VFO is supposed
to be when the dial is at XX  000 and I presume it's 3.455 kc but wanting
to make sure.

Thanks,
Barry - N4BUQ


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