Divide the 10MHz by 2 and use a filter to extract the fifth harmonic from the 
5MHz square wave output.

Amplify the 25MHz output from the filter if required...

Bruce

> 
>     On 09 January 2018 at 00:31 Chris Wilson <[email protected]> wrote:
> 
>     08/01/2018 11:28
> 
>     Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
>     as a reference clock at 1v P to P square wave for a Si5351a
>     synthesizer chip please? I have the David Partridge divider board from
>     way back that is still going strong, but 25 MHz is not an option as it
>     divides only. Thanks, please keep replies to the level an idiot might
>     comprehend :)
> 
>     --
>     Best Regards,
>     Chris Wilson.
>     mailto: [email protected]
> 
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