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



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[alsopb]

Ron,

The MV89A is pretty incredible-- especially for the price.

I think two statements in your posting contradict each other though.
It isn't basically "on frequency" from a cold start.   It drifts 10's of
Hz until the oven temp and oscillator stabilizes.
The second statement about taking 40 minutes is more accurate.

Upon receipt of mine, there was some calibration needed to have it
accurate < 1 Hz.

After calibration and warmups of 2 hours to days, the residual drift was
incredibly low <0.003 Hz/day!

For those who can live with it being powered continuously, it is an
excellent unit to discipline the K3.

73 DE Brian/K3KO


On 10/31/2015 14:08 PM, Ron Durie wrote:

> 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
>
>
>
> ______________________________________________________________
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>
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