[R-390] Capehart made R-390A Serial #312

[Larry Haney]

Hi Karsten, Does the 31 mc band adjust OK?

Regards, Larry

On Thu, Apr 10, 2025 at 4:53 AM Karsten Simon via R-390 <
r-390 at mailman.qth.net> wrote:

> I am currently working on realignment: checking and tuning Crystal
> Oscillator subchassis. Frequencies measured with an accurate  8-digit
> digital counter. Everything appears to be ok. One exception: oscillator
> output on band 30 is 22 MHz (2nd harmonic), should be 33 MHz (3rd
> harmonic).
> Active crystal is Y403 (11 MHz). Trimmer capacitor C431H appears to be ok.
> Output (pin 3 of T401) is in the range of 3 to 5 volts and can be adjusted
> by turning C431H. Band 8 (11 MHz osc. output) is ok. Band 19 (22 MHz osc.
> output = 2nd harmonic) is ok. Any ideas why band 30 output is 2nd harmonic
> and not 3rd?
>
> Regards
>
> Karsten
>
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