[time-nuts] 1 pps Accuracy in two locations

[Bob kb8tq]

Hi

Taking “a few ps” to mean 1 ps (which is *not* what was said), 
you likely need to have a pulse to pulse performance that was
good to << 1x10^-12 at 1 second. First step is to get a couple of 
standards that have an ADEV below 1x10^-13 at 1 second. How
much below that level is going to depend on a few things. ( = 
how much of the budget is used up by other parts of the system, 
how well ADEV relates to what you really need …). 

My guess is that the cost of those standards is a non-starter
for most applications. 

Bob

> On Dec 4, 2019, at 4:40 AM, martyn at ptsyst.com wrote:
> 
> Hello,
> 
> 
> 
> I'm always being asked to provide equipment that can produce two 1 pps
> outputs aligned to each other to within a few ps.
> 
> 
> 
> These two 1 pps pulses are not in the same location and could be 100 metres
> to a few km away.
> 
> 
> 
> So they are asking for two of my GNSS frequency standards with 1 pps
> outputs.
> 
> 
> 
> The 1 pps outputs being derived from the rubidium oscillator (which is
> aligned to GPS/GNSS)
> 
> 
> 
> The best I think I can achieve is in the low ns range.
> 
> 
> 
> Does anyone know how this can be achieved?
> 
> 
> 
> Regards
> 
> 
> 
> Martyn
> 
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