[time-nuts] trimble Thunderbolt, how to get 25 or 27 mHz from it??

Bob kb8tq kb8tq at n1k.org
Mon Jan 8 14:29:44 EST 2018


Hi

Depending on the noise floor of the phase detector (which probably is not super
duper), even the noise *inside* the PLL bandwidth may not be all that great.

Bob

> On Jan 8, 2018, at 2:23 PM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> Yes, but the PN noise (outside the PLL bandwidth) will be much higher than with a classical multiplier.
> 
> Bruce
> 
>> 
>>    On 09 January 2018 at 02:14 Chris Wilson <chris at chriswilson.tv> wrote:
>> 
>>    Hello Bruce, Sorry, this went to you direct as well, in error.
>> 
>>    Thanks for the very fast reply! Would it be possible to use one of
>>    these frequency multiplier IC's? Sounds simpler, but maybe there are
>>    down sides?
>> 
>>    http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849
>> 
>>    on 08/01/2018 13:11 you wrote:
>> 
>>>> 
>>>        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 <chris at chriswilson.tv> 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: chris at chriswilson.tv
>>> 
>>>> 
>>    --
>>    Best Regards,
>>    Chris Wilson.
>> 
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