[Elecraft] 10 MHz Reference Oscillator

[Ron Durie]

These OCXOs are less than 2" cube in size and available on e-Bay from
several dealers.  They cost about $30. 
Search for: MORION MV89A.  My date is 08/18.  This is a 2008 year unit.  My
unit is hermetically sealed with NO adjustment available.  It is a double
oven model, made in St Petersburg.  It is very accurate up to 10 to the -9
or better.  More than enough accuracy for a K3.

I AM USING A MORION MV89A directly into my K3.  It runs on 12v and has
fantastic accuracy for the K3.  It is basically on Frequency from cold start
to as warm as you use it.  You never have to adjust your reference
oscillator in the K3 again.  My MV89A runs on 12v continuously.  It is not
practical, or advisable to turn it off and on with the K3.  From a cold turn
on the MV89A will take up to 40 minutes to get up on, or close to,
frequency.  

The Trimble Thunderbolt is the best option and the most accurate, for a
service bench environment.  I have one running on my service bench.  It
works fine on the K3, however it is over-kill for the K3 and it is complex
with several boxes and a GPS antenna, etc. etc.  

Ron Durie
WB4OOA Elecraft K-Line