[time-nuts] Realistic Tbolt phase noise

[Bob Camp]

Hi

Power supply noise would be the first thought.

Next up would be grounding inside the Thunderbolt (card to case, connectors to case).

Bob


On Mar 9, 2010, at 7:32 AM, Christophe Huygens wrote:

> Hi,
> 
> I noticed several vendors on Ebay have the t-bolt on sale.
> 
> However, the once showing their own PN plots seem to get only
> -115, -120 dBc/Hz at 100Hz. Yet,
> http://www.leapsecond.com/pages/tbolt/noise.htm seems
> to have mucht better results: up to -150 depending on
> power supply.
> 
> By multiplying to 1GHz I also seem to be getting something
> like -75 or - 80 rather than -110.
> 
> Any thoughts?
> 
> Christophe
> on4iy
> 
> 
> 
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