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

John Ackermann N8UR jra at febo.com
Sat Jan 20 08:59:39 EST 2018

Hi Mark --

Thanks!  To clarify, when you say you've found "it" acceptable, you're 
referring to the 5328?

What caught my eye about the 5351 was the three (or eight) outputs.  My 
idea was to build a board that would provide independent LO oscillators 
for multiple VHF/UHF transverters.  It looks like the 5328 has two 
outputs, which is still useful but would require putting two or three of 
them on the board.  Which isn't the end of the world.


On 1/19/2018 8:56 AM, Mark Goldberg wrote:
> On Jan 19, 2018 6:01 AM, "John Ackermann N8UR" <jra at febo.com> wrote:
>> Sorry to hijack the thread, but the Si5351 looks interesting for another
>> project I'm working on.  I know it specifies "low jitter" but has anyone
>> looked at the phase noise?  Is it usable for RF applications?
> Datasheet states jitter in the 40-70 ps range. That is not very good. If
> you want something suitable for RF applications, look at the Si5328. It has
> jitter on the order of 300fs.
> I believe Leo Bodnar uses it in his GPSDOs and I can confirm the phase
> noise and Allan Deviation others have found and it is suitable for me for
> RF applications. It is not nearly as good as the Thunderbolt though. It
> will generate almost any frequency you want.
> Mark
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