[Elecraft] [KX3] Need Advice - Xmt & Rcv frequencies differ but RIT turned off

[tcollen]

Hi Jerry,

My TS-590 exhibits almost a similar situation, without the SO-3
high-stability oscillator installed. The specs say the 590's frequency
stability is within +- 5ppm, and I've found the higher in frequency I go,
the further up I need to tune to zero-beat a station. On 20m, I've found I
have to consistently tune up a bit to center.

Doing the math, it looks like your KX3 is at least consistently off by 25 or
26 ppm:

133 / 5.0 = 26.6 ppm
190 / 7.335 = 25.9 ppm
250 / 10.0 = 25 ppm
384 / 15.0 = 25.6 ppm

25-26 ppm definitely adds up, and it seems to me the unit is mis-calibrated,
but I don't know what the KX3's tolerance for frequency stability is.  I'm a
new KX3 owner myself so I haven't had enough experience with it to figure
out if my unit is off by a small bit or not.

Does the behavior change when the unit has been off for a while, vs when it
warms up?

Cheers,

 - Tony, N0RUA



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