baofeng radio carrier detect

Discussion in 'The Projects Forum' started by voices, Aug 17, 2014.

  1. voices

    Thread Starter New Member

    Aug 17, 2014
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    i have a set of baofeng radios i am interfacing with echolink. i have isolation transformers on both audio channels and serial activation of the ptt on the radio but i want to be able detect when the squelch is open and send a serial signal back to the computer. i'm trying to design a circuit to activate a relay off the audio out of the radio. it works if i don't have the isolation transformer connected but when i connect the transformer it stops working. any help would be appreciated.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Schematic?
     
  3. DickCappels

    Moderator

    Aug 21, 2008
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  4. voices

    Thread Starter New Member

    Aug 17, 2014
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    here is a sketch i threw together, sorry for the poor quality. i did some more experimenting today. if i remove the 100 ohm resistor it will work but it also activates when signal is coming from the computer back to the radio. the relay i am using draws about 100 mA. i'm going to get another relay today that only draws 10 and see how that works.
    [​IMG][​IMG]

    [​IMG]
     
  5. alfacliff

    Well-Known Member

    Dec 13, 2013
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    is there an led that lights up when recieving a carrier? if so, just detect light from that.
     
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