[time-nuts] FW: Question about the PLL of Trimble Thunderbold

jimlux jimlux at earthlink.net
Mon Oct 29 22:52:37 EDT 2018


On 10/29/18 12:03 PM, Hal Murray wrote:
> 
>> Cables, which are of course low dispersion and low temperature coefficient
>> cables.
> 
> If I go looking for good cables, do they specify temperature coefficient? 

They sure do.. Usually it's specified as a phase shift vs temperature vs 
frequency.



  I
> don't remember ever seeing it when scanning specs, but I probably wasn't
> looking for it so I could have skimmed over something.


> 
> What determines the dispersion of a cable?  Is it as simple as bigger wire
> (more copper) is better?


the dielectric is the primary determinant of this.

> 
> Why do I care about the dispersion as long as all cables match?
> 
> 




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