Connect with us

Wireless microphone crystals

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

Scroll to continue with content
  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
    pulls.

    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
    source.

    Best regards,
    --sp



    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.

    BTW:

    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
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-