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Unamplified D-104 wiring problems

Discussion in 'General CB Services Discussion' started by dozerman, Nov 13, 2017.

  1. dozerman

    dozerman hello, its me again

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    i hope this is in the right forum. I've got a couple d104's that are unamplified, one from '75 and one from '62 with the DN-50 head. I've been trying to wire these to a four pin plug but can't seem to get the wiring right. On both o have red, blue, with the shield having the black and white inside it. I've tried every astatic wiring layout I can and it won't recieve, unless keyed. It won't key up the radio. If it keys, it won't recieve. That's on any radio and my mic tester. Any help would be appreciated


     
    #1 dozerman, Nov 13, 2017

  2. kaos513

    kaos513 Well-Known Member

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    i would suggest checking the mic wiring with a multimeter.
     
    #2 kaos513, Nov 13, 2017
  3. nomadradio

    nomadradio Analog Retentive

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    Those mikes were built for a PA system, probably. The internal hookup is different from the mikes the Astatic book is meant to be used with.

    Good chance that there are TWO wires inside the braided shield. If so, it was meant for use with a low-impedance head like the DN50, and NOT the round high-impedance head.

    The internal schematic would typically be found glued inside the bottom cover. Good chance that this mike has only a "transmit"-side switch and does not have a contact that makes the circuit for receive side.

    The round "lollipop" head is normally built with a high-impedance cartridge. Very few solid-state radios will match this mike, because they'll have a low input impedance. Even if you get it to key the transmitter, the audio will be incredibly weak.

    The DN-50 head is a very low impedance head. It's meant to use with very long cords between the mike and amplifier, with a step-up transformer at the far end. Might sound okay with a solid-state radio, or may be a bit on the weak side.

    Removing the switch from inside the mast is the only way to find out if you have any 'spare' contact points in there to wire up for receive side. Lining up the screw holes on the switch is a major PITA when you reassemble it.

    73
     
    #3 nomadradio, Nov 13, 2017
    Sonar and midnight special like this.
  4. dozerman

    dozerman hello, its me again

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    Yeah I've discovered that. I tried numerous times last night to wire it up and got nothing. The one with the dn50 head I have, I would love to be able to use it. Just looks so cool. I guess short of replacing the element and re wiring the entire thing, it will just be a cool piece in the shack.
     
    #4 dozerman, Nov 14, 2017
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