[Elecraft] K3XREF Question

[Chuck Smallhouse]

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