The difference between TCXOs is 4ppm not 4 Hz. The standard TCXO can be
+/- 250 Hz at 50 MHz, the optional one can be +/- 50 Hz at 50 MHz or
perhaps +/- 25 Hz once the firmware is changed to allow the supplied
calibration table to be used. Using the optional 1ppm TCXO in my K3
results in a typical accuracy of within 20 Hz at 50 MHz, under normal
shack temperatures. I run a home brew GPS derived standard for
calibration purposes.
The K3 is one of the few transceivers that can be adjusted for frequency
without taking a cover off or needing a trim tool, it can be easily
calibrated every hour, every day or whatever - if that's what floats
your boat. Whether you need the higher accuracy is only something you
and your wallet can decide.
73 Dave, G4AON
K3/100 #80
-----------------
"The average user won't notice the +/- 4Hz
improvement"
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