Hi Don and All
IMHO using a GPS disciplined 10 MHz (Trimble etc.) or a Rubidium
standards are unnecessary , expensive and overly complicated
approaches, to be used as the K3XREF 10 MHz external source.
There are extremely stable (as high as 10 x-12th) Double Oven
Controlled Xtal Oscillators (OCXOs) available on the Off Shore
surplus market, for under $50 delivered. These are pulls from US
built surplus equipment, and are guaranteed and tested . I have
bought several, and the latest one has been bench tested for several
months, and after initial adjustment has not varied a single cycle on
my GPS locked counter. Even this stability, is an overkill, when
used as an external reference for the "frequency", not "phase" locked K3.
These OCXOs are less than 2" cube in size and available on e-Bay from
several dealers. Check e-Bay under the subject OCXO.
Chuck, W7CS
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