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, h...@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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