[time-nuts] Best Rubidium Frequency Standard

Bob Camp kb8tq at n1k.org
Sat Mar 12 20:23:39 EST 2016


Hi


> On Mar 12, 2016, at 6:11 PM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> jerry wrote:
> 
>> Is there any model-suffix or other identifier that would inform whether a used PRS-10 has the PPS sync input feature??
> 
> Not that I am aware of.  Not even the "customer part number" is a reliable guide -- I have had several examples each of various CPNs, and some did have the sync input feature and some did not.  (I've also seen examples of other CPNs, *none* of which had the feature.  My sample hasn't been large enough to conclude that none of them does, however.)
> 
> Re: how useful the feature is, if it is present: the PRS10 PLL is extremely adjustable, and there are LOTS of combinations of settings that won't work worth a damn with any particular external input.  So, finding a good combination can be difficult, and finding the best combination can be elusive at best to maddening (or worse).  Read the manual carefully, and pay attention both to the default settings and to the hints that SRS provides.  With the right settings, a PRS10 *does* work extremely well with the PPS input from a GPS.  They do generally take several days or more to lock, because of the long time constants involved.

I would call having to wait a few days for it to lock a bit of a disadvantage. Even more so for those with an antenna challenged environment that gives them dropouts every few hours.

Bob

> 
> Best regards,
> 
> Charles
> 
> 
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