[time-nuts] GPSDO three cornered comparisons

Said Jackson saidjack at aol.com
Sun Oct 21 19:44:36 EDT 2012


Instead of Stable32, try Ulrich Bangerts plotter tool, it has a host of stability analysis built in and is easier to use than Stable32 in my opinion.

Its also free.

Bye
Said

Sent From iPhone

On Oct 21, 2012, at 14:21, David Hooke <dhooke at gmail.com> wrote:

> Hi All,
> 
> I have an HP 58503A and a Symmetricom 58503B which are behaving quite differently to one another using a common antenna. Using Z38xx, there's almost an order of magnitude difference between the reported ADEVs at 40k seconds (HP:7e-13, Sym:5e-12). Both have 10811 oscillators and are reporting similar ADEVs up to about 1000 seconds. The Symmetricom is also showing large daily temperature variations, while the HP is stable, noting that ambient is varying 5-10dC over a day (I'll measure this from now on).
> 
> I connected my modified Tbolt (new/good oscillator removed from PCB, old temperature sensor chip removed from PCB and bonded to oscillator can), which is showing performance between the two 58503s, although it's only been connected for a day (but has been powered for weeks).
> 
> So is my HP 58503A telling me fibs, or is the Symmetricom crook?
> 
> I'd like to do a three cornered hat comparison between them. I'll collect PPS TI data (A-B, A-T, B-T) using Timelab and a PM6681 (the only TIC I have), but need help on how to post-process the data sets to isolate the individual units' performances.
> 
> Any tools out there to help (without purchasing Stable32)? I can use Perl to manipulate the raw data, but don't have the maths skills to do the analysis myself.
> 
> Thanks,
> 
> david (still an apprentice TN, but probably addicted already).
> 
> 
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