Don,
The issue isn't whether the TCXO is an improvement over the standard.
The issue is whether the TCXO is good enough for some of the wide range
of uses the K3 is put.
What you are hearing here is that it isn't. Elecraft has responded with
the external locking option. That option, being a discontinuous
correction, one has some significant disadvantages to some.
My original posting on this issue was related to the locking option. It
only seemed reasonable to have it do a sanity check on the difference
between the internal and reference oscillator implied correction before
doing a correction. Why do the correction is the external oscillator is
warming up and 250 Hz off initially? The K3 also drifts during warmup
with both the standard and TCXO. This amounts to between 20 and 50 Hz
(@ 10 MHz) for the first 15 minutes. Why do the correction until the K3
has is relatively stable. Perhaps the external locking should not be
done for say the first 15 minutes after K3 turn on?
73 de Brian/K3KO
On 10/16/2014 12:06, Don Wilhelm wrote:
Brian,
The High Stability TCXO (1 ppm) is not a separate Elecraft product - it
is an option for the K3 offering better specs than the stock TCXO (5ppm)
- yes, both are a TCXO.
The temperature stability was found to be far better than the 1ppm
specification without the temperature compensation routine, so
implementation of that K3 routine was dropped from the plan (and also
from the manual).
73,
Don W3FPR
On 10/16/2014 7:39 AM, Brian wrote:
Ken,
There is an Elecraft product called the TCXO. It is capable of
temperature stabilization BUT Elecraft has not implemented that function.
Perhaps though should be given to implementing the temperature
compensation capability. My understanding is that there is some
difficulty in doing that and maintaining low phase noise.
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