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

Bob Camp lists at rtty.us
Tue May 28 19:57:33 EDT 2013


Since the 10 MHz OCXO is in some way acting as a reference for the GPS in the TBolt, there is a slight chance that the 5 MHz spurs could impact the receiver. I doubt it would be a problem, but it's worth watching out for.


On May 28, 2013, at 7:09 PM, Frederick Bray <fwbray at mminternet.com> wrote:

> On 5/28/2013 9:52 AM, Bob Camp wrote:
>> 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.
> This certainly explains what I saw when I looked at a MV89A on a spectrum analyzer and saw a signal /below/ the 10 MHz spike. I kind of figured that it must be multiplying to get to 10 MHz.
> Thanks for the info.  When I get a chance, I will have to pull the Thunderbolt out of its case and take a look at the pads on the board.
> Fred
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