unknown crystal - how do you find frequency?

Discussion in 'General Technical Questions and Answers' started by AD7N, Jan 11, 2009.

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  1. AD7N

    AD7N Ham Member QRZ Page

    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. K9STH

    K9STH Ham Member QRZ Page

    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. KA5S

    KA5S Subscriber QRZ Page

    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).

  4. NA0AA

    NA0AA Ham Member QRZ Page

    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. K8JD

    K8JD Ham Member QRZ Page

    plug it into a test osc circuit and find the signal on a gen coverge receiver.
  6. K8ERV

    K8ERV Ham Member QRZ Page

    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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