Frequency stability is normally expressed in terms of ppm over a
specific temperature range.
For the KX3 it is +/- 1 ppm over 0 to 50 degC.
I believe the statements below confuse tuning frequency calibration
inaccuracy with stability - one has nothing to do with the other.
Problems with the KX3 being consistently off frequency can normally be
resolved by doing the Reference Frequency Calibration (see the
Caalibration section of the manual).
73,
Don W3FPR
On 8/12/2014 3:14 PM, tcollen wrote:
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?
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