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Thread: unknown crystal - how do you find frequency?

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  1. #1
    Join Date
    Jul 2006
    Location
    Montana
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    Default unknown crystal - how do you find frequency?

    I found a crystal lying in my junk box, but it doesn't have the frequency stamped on it, just a part number: 16AKSS7CT.

    Is it decipherable, or is there a way to figure out the crystal's resonant freq?

  2. #2

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    You can build a simple oscillator and then measure the output frequency with a counter. Also, you can connect the pins together with a loop of wire and then use a grid dip oscillator to excite the crystal and measure the frequency with a counter.

    Glen, K9STH

  3. #3
    Join Date
    Apr 2003
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    MI
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    Quote Originally Posted by KE7HQY View Post
    I found a crystal lying in my junk box, but it doesn't have the frequency stamped on it, just a part number: 16AKSS7CT.

    Is it decipherable, or is there a way to figure out the crystal's resonant freq?
    1) Put it in an oscillator and see what frequency it runs at.
    2) Throw it on a network analyzer.
    3) Stimulate with with a nanosecond or faster pulse and examine ringing of the crystal resonator with a laser interferometer (no, not really, though it should work-- grin).



    Cortland
    KA5S

  4. #4

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    Quote Originally Posted by K9STH View Post
    You can build a simple oscillator and then measure the output frequency with a counter. Also, you can connect the pins together with a loop of wire and then use a grid dip oscillator to excite the crystal and measure the frequency with a counter.

    Glen, K9STH
    Ain't that a DEVO song?

    "When a crystal comes along
    You must dip it"
    Dip it good!

    If you don't have a GDO, the MFJ SWR Analyzer can be used with an optional coil set too.

  5. #5
    Join Date
    Jan 2000
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    Commerce MI (Detroit area)
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    Default

    plug it into a test osc circuit and find the signal on a gen coverge receiver.
    73.....JD, FISTS #3853,cc 455,SKCC # 1395,tribune #12,
    Official US Taxpayer

  6. #6
    Join Date
    Jan 2004
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    Beautiful Downtown Colorado. (Montrose, SW corner)
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    28,917

    Default

    You can also find it with an rf signal generator. I think most of the listed methods will find the fundamental freq, but some xtals are are optimized for a "harmonic" frequency generation.

    TOM K8ERV Montrose Colo

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