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economical bandpass audio filter?

Discussion in 'Electronic Equipment' started by [email protected], Jan 10, 2006.

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  1. Guest

    seek recommendations. for voice intelligibility enhancement on a
    orderwire copper-pair.

    professional marine application. sturdiness is more important than
    bleeding-edge performance.
     
  2. Dan Conti

    Dan Conti Guest

    When are they coming for Cuhulin?
     
  3. Guest

    It might help to describe the application in more detail.
     
  4. Jasen Betts

    Jasen Betts Guest

    ["Followup-To:" header set to sci.electronics.misc.]
    ordinary copper wire pair?

    check that the devices at each end are operating correctly
    and have the correct power supply etc..

    maybe you need a better microphone?
    possiblly one with background noise rejection.

    amplify the signal before putting it into the wire
    then the noise will be less significant

    bandpass filter 300-3000Hz

    encode the audio digitally (probably major overkill)
    keep the wires dry and waterproof all junctions...
    i'd look at liquid electrical tape unless you have a superior product.

    keep them away from power runs or rune them in a separate conduit from
    the power

    Bye.
    Jasen
     
  5. David

    David Guest

    They make telephone instruments just for order wires.
     
  6. Jayseebee

    Jayseebee Guest

    Actually we (retired and Ex ATT,Bell,SBC and now ATT again) used to do a
    frequency run test with an audio signal generator and a receive
    measuring device at the far end. If needed we would put in a equalizing
    unit (Wescom, Teltrend, etc) that we could adjust the 300-to 3khz slope
    (sometimes up to 8khz for audio program loops for radio broadcast) with
    to make all frequencies as flat as possible or boost the level of the
    freqs as needed. You can get even more technical in the time delay at
    different frequencies on the same copper path traveling from one end to
    the other. Lets see what this stirs up.

    JCB
     
  7. Digitizing it, then running it on a network would give you the best
    voice quality, and the network can be used for other data
    ( environmental, remote control, alarms, ect) plus it would be relatively
    simple to set up..
     

  8. I was a US Army broadcast engineer at Ft Greely, AK back in the early
    '70s. Our AFRN network feed came through the "White Alice" microwave
    network. By the time it reached our station the level was so low that I
    had to use a spare magnetic phono preamp from our old transcription
    turntable to bring the feed up to line level. Before that, when they
    went from network to live, or back to the network they had to reset the
    levels. Repeated requests were made to fix the feed, but we were always
    told that the level was ok in Fairbanks, and the problem must be on our
    end of the feed because the phones worked.

    --
    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. Don Bowey

    Don Bowey Guest

    As I recall, the telco-techno correct language for that is: "the trouble is
    leaving here ok," which is used almost as often as: "trouble came clear
    while kicking bay."

    Don
     
  10. David

    David Guest

    http://history.acusd.edu/gen/sespics/362-22.JPEG
     
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