[time-nuts] Just for Fun - Synergy Systems SSR-6T PPS Comparison

David Martin drmartin at ivietechnologies.com
Thu Dec 20 06:07:20 UTC 2012

A Day in the Life of Five PPS Sources..

This probably does not qualify as a regular TimeNuts submission as there
are no Tau's or 10^-12ths but I could not resist a simple scope capture of
the Pulse Per Second output of my new SSR-6t toy from Synergy Systems as it
performed its first right-out-of-the box site survey.

See http://youtu.be/kOG9ImT2lvY

This is video is a two minute replay of the PPS behavior of two PRS-10s,
two TBolts, and the SSR-6t during it's initial 24 hour site survey.

The scope captured the relationship of all five PPS outputs at one frame
per second.  The video clip replays 24 hours of captures at 1000 frames per
second. The whole day's PPS behavior is replayed in under two minutes.

The Scope is externally triggered from a PRS-10 that
is actively disciplined from a TBolt PPS.  The Yellow Trace is a second
PRS-10 that is also actively disciplined from the same TBolt.  Hence the
trigger point (center of screen) and the Yellow Trace compare the two
PRS-10s that have been running in parallel for a couple of months.

The Magenta Trace and the Blue Trace are two other TBolts. (These traces
have the nice sharp risetime )

Everybody is fed from a common antenna via a mini-circuits splitter.

The Light Blue Trace is the new SSR-6t running in navigation mode. The
spreading of the Light Blue Trace is the usual sawtooth dance that most raw
GPS PPS outputs display -- The playback rate just smears all the individual
sawtooth steps into a pretty waterfall.

This is not intended to be a "scientific" submission but I hope someone
finds it entertaining and enlightening view of the instantaneous PPS
behavior of these devices.


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