[R-390] Fwd: R-390 VFO Question

[Larry Haney]

Ooooops - forgot to include the forum.  Larry

---------- Forwarded message ---------
From: Larry Haney <larry41gm2 at gmail.com>
Date: Sun, Sep 15, 2024 at 9:10 PM
Subject: Re: [R-390] R-390 VFO Question
To: Barry Scott <72volkswagon at gmail.com>


Hi Barry,  You are absolutely correct in your deductions.  When the KC is
at its lowest of 000, the vfo is at its highest (3.455 mh).

Regards, Larry

On Sun, Sep 15, 2024 at 7:23 PM Barry Scott <72volkswagon at gmail.com> wrote:

> 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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