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Frequency Stability expressed in ppm

Discussion in 'Radio Circuits, Repair & Performance' started by AJ4UY, Aug 1, 2020.

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  1. AJ4UY

    AJ4UY Ham Member QRZ Page

    Hello -

    How may you correlate a units Frequency Stability in Hertz when the Frequency Stabilization Spec is listed in (ppm) parts per million. (?)

    For every MHz : +/- 7 Hertz.

    Spec snapshot, here - attachment.
     

    Attached Files:

  2. KA5IPF

    KA5IPF Ham Member QRZ Page

    Simple. +/- 7 PPM

    On 80m center freq of 3.750 MHz stability is 3.75 x 7 = 26.25 So @ 3.75MHz stability = +/- 26.25 Hz
    10m = 28.5 stability is +/- (28.5 x 7) 199.5Hz.

    All that is saying is how much it's allowed to move and be within spec. It says nothing about the accuracy of the oscillator itself, just how stable it is.

    And in this case that is from turn on to 60 minutes after turn on. It's different after that IE: that is warmup time.
     
  3. AJ4UY

    AJ4UY Ham Member QRZ Page

    Thank U.

    The spec . . .
    it just seemed a bit high , esp. at 6 meter frequencies for the first 60 minutes.
     

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