[Elecraft] K3(s) main oscillator calibration

[hdv at kpnplanet.nl]

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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