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Wireless microphone crystals

Discussion in 'Electronic Design' started by Spehro Pefhany, Jan 3, 2014.

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  1. Hi,

    I ended up with a VERY old stack of 50-100 paper envelopes, each
    containing at least one crystal HC-49 full size. Some are new, some

    There are alien markings like 77-TX and T82B-TX as well as frequency
    numbers such as 154.60, 171.025, etc. The frequency numbers are
    related to the stamped crystal frequencies by a factor such as:
    fcrystal = (1/2) * (frequency - 21.4MHz)

    Are these things of any use to anyone here? If so, they're yours for
    the cost of postage (should be less than $15 to anywhere in US or
    Canada). Otherwise, they'll go out in the trash

    I imagine modern mics are all synthesized from a single crystal

    Best regards,

    Best regards,
    Spehro Pefhany
  2. Phil Allison

    Phil Allison Guest

    "Spehro Pefhany"

    ** Put them on Ebay.

    Bet someone bids a couple of bucks each for them.


    Transmit crystals (TX) used in most radio mics are a special cut that allows
    them to be easily "pulled" by up to 0.05% to create FM.

    .... Phil
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