[time-nuts] 5370 processor boards available

Bob Camp lists at rtty.us
Fri Feb 28 22:57:02 UTC 2014


Hi

I agree that improving the basic accuracy is a bit of a stretch. The first thing to look for would be temperature sensitivity that you could take out with a correction table. In another post you beat me to the 200 MHz chain and it’s phase locking. One might be able to do something interesting with a digital filter on the PLL ...

Bob
 
On Feb 28, 2014, at 8:18 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> In message <87CAF1A2-D281-4331-B019-B01B06F11DFB at rtty.us>, Bob Camp writes:
> 
>> To me the next layer here is to see if the basic accuracy of the device 
>> can be improved in software.
> 
> I have a hard time seeing how that would happen.
> 
> I think one of the best chances would be to improve the phase
> noise of the 200MHz signal.
> 
> But don't miss the fact that being able to make a LOT more measurements
> in the same time also improves noise statistically.
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.




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