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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