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Ground on PTT mod?

Discussion in 'CB Radio Modifications' started by 9two7, Dec 20, 2020.

  1. 9two7

    9two7 New Member

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    Hi all,

    I’m interested in adding a ground-on-xmit output to my galaxy 959 but the question pertains to any similar radio.

    The ground path established during PTT won’t need to handle any significant current, 50mA at most.

    This should be similar to an amp keyer circuit which but without the need to switch higher current.

    Unfortunately I haven’t found much literature on the topic of adding amp keyer circuits to these radios.

    Any pointers?
    Thanks & 73’s!
    9two7


     

  2. sp5it

    sp5it Master of puppets

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    dddd.gif
     
  3. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    Might be able to put a relay on the pin 3 of the mic jack.
     
  4. nomadradio

    nomadradio Analog Retentive

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    This is how we have been doing it for years.

    http://www.ebay.com/itm/114364446019?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

    The price is stupidly high, compared to what appears on a customer's repair invoice when we install one. That's just the reality of Ebay-nomics.

    Nothing tricky about it.

    [​IMG]

    Does serve to isolate the ground on the keying cord from ground in the radio.

    73
     
  5. 9two7

    9two7 New Member

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    Thanks guys, that helps! Very kind of you.
     

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