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Help: Where Can I find tuning forks for freq of 500~800 hz.

Discussion in 'Electronic Components' started by [email protected], Mar 20, 2007.

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  1. Guest

    Hello Group?

    I am looking for the components, tuning fork, frequency of 502.5,
    532.5......802.5hz range for maritime radio beacons. If anyone share a
    information about, who makes, where can I order..., I will be
    appreciated very much.

    Thanks,
    HWLEE
     
  2. Bob

    Bob Guest

    Musical tuning forks may get you close for some of the frequencies. They
    should be available in frequencies 440Hz * 2^(n/12) where n is a whole
    number (positive, zero, or negtive -- within reason).

    For example:

    A is 440.00Hz
    A# is 466.16Hz
    B is 493.88Hz
    C is 523.25Hz
    C# is 554.37Hz
    and so on.

    However, I'm having a hard time finding chromatic sets (separated by the
    12th root of 2 ratios) that are anything wider than from 261.6Hz to 523.3Hz.
    Here's a link:

    http://www.mypianoshop.com/store/home.php?cat=40

    You could probably trim them to get the exact frequency you wanted, but I'm
    not sure how well this would work.

    Bob
     
  3. Eeyore

    Eeyore Guest

    Are you sure you really want tuning forks ?
    http://en.wikipedia.org/wiki/Tuning_fork

    Graham
     
  4. What kind of radio beacons are in the 500Hz range?

    I think the poster is missing the "K" for KHz.

    Whether or not he actually needs tuning forks, at least up there they'd
    be of reasonable size.

    Michael
     
  5. Ken

    Ken Guest

    Just curious. Is there some reason you don't use an oscilloscope to
    determine the frequency rather than a tuning fork??
     
  6. Tim Wescott

    Tim Wescott Guest

    Whether you mean Hz or kHz, wouldn't you be better off using DSP or some
    other signal processing method that's more compact (and precise) than a
    bunch of tuning forks?

    What, exactly, are you trying to do?

    --

    Tim Wescott
    Wescott Design Services
    http://www.wescottdesign.com

    Posting from Google? See http://cfaj.freeshell.org/google/

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at http://www.wescottdesign.com/actfes/actfes.html
     
  7. That's interesting. I was reading "tuning fork" as in a frequency determining
    device. Don't some clocks (as in for reading time) use things referred to
    as "tuning forks" instead of crystals for keeping accurate time?

    Michael
     

  8. Those frequencies look like old pager or tone squelch fregencies.
    Motorola, Bramco and Ledex made the "reeds", which were mecahnicaly
    tuned, frequency selective relays. A simpler system was used for RC
    control, years ago.

    <http://www.google.com/search?num=10...YA:2006-31,GWYA:en&q=bramco+reeds&btnG=Search>


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  9. Ken

    Ken Guest

    Can't help you there, I know nothing about fancy clocks. I only have
    the cheap ones that either use the 60 cycle method or a crystal oscillator.
     
  10. Rich Grise

    Rich Grise Guest

    The Bulova Accutron used a tiny metal tuning fork with coils, in an
    oscillator.
    http://www.allamericanwatches.com/site/626101/page/182611

    You might be thinking of "tuning fork" crystals, were the
    crystal itself is in the shape of a tuning fork - that's how they
    can fit a 32.768KHz crystal into a can about the size of a tic-tac.

    Cheers!
    Rich
     
  11. Al

    Al Guest

    There are such things as tunable tuning forks. I have seen them
    demonstrated. Moveable weights on the tines change the frequency. Here
    is one example, although an expensive one:

    http://www.omnivos.com/pc/0113/01/Resonator

    Al
     
  12. Rich Grise

    Rich Grise Guest

    Well, I guess if you need a machine to "align your brain waves", money is
    no object. ;-)

    Cheers!
    Rich
     
  13. Al

    Al Guest

    Woowoowoowoowoowoowoowoowoo....

    ;-)

    Al
     
  14. Guest

    No, I did not missing the unit "K", the frequency is hundred Hz order.
    It's a precision oscillating device work as x-tal oacillator, when you
    need precise oscillation on such low frequencies like 500Hz range
    stability of sub ppm , you need a part that I am looking for.

    A radio beacon that using marine apprication use these oscillation
    source to generate group of precise tones, then the receiver
    discriminate tones to identify the beacons. This is looks like a small
    relay about 10mm x 10mm x 25mm, has 3pins.

    Regards,
    HaeWoon
     
  15. jasen

    jasen Guest

    sounds like the electronic reed I saw in a ripple control relay.

    Bye.
    Jasen
     
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