[Elecraft] K3(s) main oscillator calibration

[hdv at kpnplanet.nl]

I have seen a lot of answers.
These are all true, but what is the exact way of working.

73 Henk

-----Oorspronkelijk bericht-----
Van: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> Namens Wes
Verzonden: zaterdag 6 juni 2020 21:22
Aan: elecraft at mailman.qth.net
Onderwerp: Re: [Elecraft] K3(s) main oscillator calibration

The various reference calibration methods, including direct measurement of the TCXO that I do, just determine what the actual reference frequency is, but don't change it.

This value is then used internally to compute the correct frequencies.

Wes  N7WS

On 6/6/2020 11:47 AM, hdv at kpnplanet.nl wrote:
> Hi all,
>
>   
>
> In the CONFIG menu REF CALL the value of the main oscillator can be set.
>
> However, this does not impact the TCXO frequency at all in a direct sense.
>
>   
>
> Whatever the REF CALL value, the TXCO frequency stays the same.
>
> This can also be seen in the schematic.
>
> The TXCO just outputs 49.380 MHz and has no 
> voltage/frequency-adjustment input.
>
>   
>
> So where and how does the frequency correction take place?
>
> Somewhere at the 15 kHz level or in the KSYN3 DDS / KSYN3A divider?
>
>   
>
> Who can explain the principle.
>
>   
>
> 73 Henk
>
> PA0C
>
>
>

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