[time-nuts] Frequency reference

Jim Lux james.p.lux at jpl.nasa.gov
Sun Apr 20 12:25:37 EDT 2008

Quoting Attila Kinali <attila at kinali.ch>, on Sun 20 Apr 2008 05:50:21 AM PDT:

> On Thu, 17 Apr 2008 08:47:48 -0700 (GMT-07:00)
> "Richard W. Solomon" <w1ksz at earthlink.net> wrote:
>> You can build a very good GPSDO for about $100 in parts.
> Stupid question, but if one builds his on frequency
> reference, how can you be sure it's acurate and precise?

not a stupid question at all..PhD dissertations have been written  
about answering it.

> Or to but it in other words: how do you measure self build
> devices?

Build 2 or 3, and compare them against each other. (can't have too  
many frequency and time standards...<grin>)

or, take it to somewhere that has a higher quality standard and compare

or, just trust that the performance is inherent in the design, and if  
it works at all, it's good enough. Typically, if you are building a  
copy of a known good design, this is a good start.

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