Brian,
The main frequency determining element in the K3/K3S is the TCXO and not
the SI-570.
Are you looking only at the native SI-570 thermal data, or are you
finding from our measurements that the SI-570 in the new synth boards is
not following the stability of the TCXO? The SI-570 should slave off
the frequency of the TCXO.
I do not know the rate of synchronization between the SI-570 and the
TCXO, so I will have to leave that part of your question unanswered.
Perhaps the engineer for the new synth boards will respond with
definitive information.
73,
Don W3FPR
On 6/28/2016 10:09 PM, brian wrote:
Please correct me if I am wrong.
I believe the heart of the new synthesizer is a SI-570.
Great phase noise but the output frequency is quite sensitive to
temperature changes.
It has been observed that the corrections to bring the synthesizer in
step with the master oscillator happen over longer and longer periods
as the K3 warms up. It never seems to reach a point of stability even
after 24 hours of warmup.
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