"In addition the tuner may not always be in the segment you think it is. This
is due to the 8KHz resolution of the internal counter, that wins over you
sending it a more accurate frequency, and also the hysteresis algorithm that
can require a 2 segment frequency change before the tuner changes. Gary from
Elecraft says "if you are off by one bin segment then it should not matter too
much"
I have the same frustration with my KAT500 tuner. I send it a frequency with 1
kHz resolution ( I was using 1 Hz resolution but found that was futile) but it
wants to override that frequency with a much less accurate RF derived
frequency. I suggested to Elecraft that the frequency received over the serial
interface should have priority unless the RF detected frequency differed by
more that a user set threshold. That proposal was rejected on the basis that
here cannot be two master frequency sources. That argument was lost on me since
I have worked in the development of avionics systems where master swaps are
common and dynamic data source selection is also common.
I settled for sending my KAT500 a new frequency any time the actual transmitted
frequency differs from the KAT500 reported frequency by more than 8 kHz. I
have also tweaked FCCS and FCMD (not easy because they don't seem to work as
documented) to make is less likely that RF detected frequency will usurp my
serial data frequency at least for CW transmissions.
I spent a fair bit of time manually selecting L and C to get a near perfect
match in the band segments I use. I find it frustrating that the KAT500
firmware thinks it can do better than what I tell it to do.
I wish Elecraft would give serial data frequency priority over RF detected
frequency until a difference threshold is exceed. It would not be difficult to
do.
Andy, k3wyc
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