[time-nuts] Navsync CW12 - More Info

[Azelio Boriani]

Great, don't forget to specify what reference your measurements were made
from (or did I miss anything from your posts?).
We use the CW12 PPS for our GPSDOs.

On Thu, Jan 5, 2012 at 6:57 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:

> Okay, I've cooled off - a bit.  The bottom line is that the 10 MHz output
> of the CW12 isn't appropriate for what I wanted to do.  Ah, the joys of
> reading and understanding a spec sheet!
>
> But let's not throw out the baby with the bathwater.  Although the 10 MHz
> output has it's issues for typical Time-Nut applications, the 1 PPS output
> is great.  Here are some measurements that I've made over the past few
> years on a few GPS receivers and a couple of GPSDOs.  I measure 1000
> periods of the 1 PPS and look at the results.  Every run gives somewhat
> different results so I've shown some typical ranges.  These measurements
> were made with an HP 5372A.  YMMV.
>
> Device .............. Std Dev (ns).... Range (max-min)(ns) ... Device Type
>
> Navsync CW12 ........ 4 - 5 .......... 20 - 25 ............... GPS Rcvr
> Motorola UT+ ........ 40 - 55 ........ 95 - 110 .............. GPS Rcvr *
> see below
> Rockwell Jupiter .... 10 ............  50 ...................  GPS Rcvr **
> Motorola M12M ....... 10 - 15 ........ 40 - 60 ............... GPS Rcvr
>
> Trimble Thunderbolt . 0.4 - 0.5 ...... 2 - 4 ................. GPSDO
> HP Z3801A ........... 0.3 ............ 2 ..................... GPSDO    ***
>
>
> *   Most of my UT+ 'range' results were in this group, but there were a
> few at 20 - 30.
> **  Only one result.
> *** Only one result.  I need to do more testing on the Z3801A
>
>
> As you can see, the Navsync CW12 is by far the best of the GPS Receivers,
> but nowhere near as good as the GPSDOs.  However, imagine using the CW12 to
> discipline a good OCXO to build your own GPSDO.  Or using it to discipline
> a PRS10 Rubidium or X72 Rubidium oscillator.  You can't do it with the 10
> MHz output, but the 1 PPS output is another story.
>
> Ed
>
>
>
>
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