[time-nuts] beautiful jump

Tom Van Baak tvb at LeapSecond.com
Fri Oct 31 02:54:57 UTC 2008


OK, if no one was around that lessens the chance of vibration. Still, I didn't want to rule that possibility out. Some of my oscillators are very sensitive to any sort of shock. Even to the point of becoming crude seismometers.

I found with shock, they don't always return back to normal; i.e., it's a permanent change (a frequency jump) not a temporary glitch (like a phase jump). But I haven't studied this enough to know for sure. Has anyone else looked into the effects of vibration and shock on XO or OCXO?

Is yours an MTI 250-series OCXO?

/tvb

  ----- Original Message ----- 
  From: SAIDJACK at aol.com 
  To: tvb at leapsecond.com ; time-nuts at febo.com 
  Sent: Thursday, October 30, 2008 7:37 PM
  Subject: Re: [time-nuts] beautiful jump


  Hi Tom,

  that's possible, this particular unit has been jumping all along, even at night when no one is in the office. Usually it's not just one jump, but a series of jumps. A mechanical bump would usually result in a disturbance, but not a permanent change in the EFC voltage.

  The unit is located in a remote sensing station in Mexico at the University of Colima.

  bye,
  Said

  In a message dated 10/30/2008 19:26:46 Pacific Daylight Time, tvb at LeapSecond.com writes:

    Said,

    What environment is this GPSDO in? Is there any chance
    that it is on a table or bench or rack shelf that got moved or
    even slightly bumped at the time in question?

    /tvb




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