Startup of three different GPS locked 10MHz frequency standards

Three different GPS locked frequency sources plugged in at the same time and checked how they behave. Leo Bodnar, Cartain, Symmetricon. The Oscilloskope is synced to a SpectraTime Rubidium 10MHz source.
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www.leobodnar.c...

[@SQ5DBF]

Very useful experiment. Thanks.

[@mukundalini]

ich hab auch mal 2 GPS Disciplined Oscillator am 2 Strahl Oszi verglichen. Beide hatten GPS Kontakt, synchron wurden die nie. Natürlich musste dann auch ein Rubidium Frequenznormal dran. Offenbar haben Cäsium Atomuhren eine andere Gangart als Rubidium Atomuhren.

[@cmuller1441]

Having a visual representation of what happened is great however it would have been nice to use a frequency counter based on the rubidium to measure the frequencies of those GPS oscillators over time.

[@SHDK-vq1rx]

You synchronized the Rubidium standard to one of the GPS clocks? That would make the comparison quite invalid as the two synchronized clock would of course be identical.

[@m1geo]

Nice video! George, M1GEO.

[@gm837228]

Hi Tobias, great video - one question for dummies like me - were you using your Rubidium to trigger the scope? I mean, if you are making the assumption that the rubidium is best, then trigger to that, however - what if the rubidium was wrong and the leo bodnar was right? Wouldn't that change the perspective? Sorry if it is a dumb question aber wer misst misst mist. :)

[@_PJB_]

If the rubidium was wrong, and the Leo Bodnar is right, the ratio of difference between the two would be proportional. Just apply the drift of the LB to the rubidium standard.
Can you know which is correct, if either? Not from the context of this video, but I would feel safe assuming an aerospace grade rubidium standard is pretty bang on.

[@g.h.2800]

Schade, man hätte auch mal den DXPatrol GPSDO V2/V3 auch vergleichen können. Etwas günstiger als der Leo. 73!