[time-nuts] Thunderbolt MV-89a OCXO Transplant?

[Götz Romahn]

Bob, how can I find out what the differences among various MV89 are ?
thanks Goetz

Am 28.05.2013 18:52, :
> Hi
>
> The MV89A is a 5 MHz resonator doubled to 10 MHz, it will have sub harmonics
> that the original OCXO (using a 10 MHz resonator) does not have.
>
> The MV89A has 10 to 20 db worse phase noise as a stand alone OCXO than the
> original OCXO. That is masked to some degree by the TBolt's internal noise.
>
> Depending on which MV89A you get (there are many flavors), it's temperature
> stability will be 3X to 10X better than the modern versions of the TBolt
> OCXO.
>
> The ADEV on the MV89A should be ~2X better than the modern TBolt OCXO.
>
> The tuning voltage range of the original TBolt OCXO is +/- 5V on the MV89
> it's 0 to 5V. The pull range on the original is about 5X greater. Both can
> be fiddled on the TBolt via LH.
>
> Check your TBolt board for the connection (if any) to the Vref pin on the
> MV89. Shorting it to ground may not be a good thing. Of course your MV89 may
> or may not have a voltage on the Vref pin.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Frederick Bray
> Sent: Tuesday, May 28, 2013 10:37 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] Thunderbolt MV-89a OCXO Transplant?
>
> Looking at the archive, I noticed that several months ago someone
> commented that the Morion MV 89A was a direct replacement for the OCXO
> in the Trimble Thunderbolt in the sense that the Thunderbolt PC board is
> configured to accommodate it.  However, I wasn't able to find further
> details.
>
> I have a spare Thunderbolt and a spare MV89A and I am considering doing
> the transplant.  Before I tear the Thunderbolt apart, I have a few
> questions:
>
> 1.  Has anyone actually performed the transplant?  (Does it work?)
>
> 2.  Are there any significant drawbacks and advantages to the transplant?
>
> I am aware that the MV 89A may pull more current on the 12 volt line
> than the Trimble and that the original Thunderbolt cover will no longer fit.
>
> Thanks.
>
> Fred Bray
>
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