Wouxun KG-UV950P / KG-UV950PL DIY hands free pinout

I have a lovely Wouxun KG-UV950PL 6/4/2/70 mobile radio, but a hands free kit doesn’t seem to be available. So I set about working out the connections required to build one. Here they are:

KG-UV950P - KG-UV950PL mic handsfree pinout

Using a standard RJ45 Ethernet cable:

  • Orange+white / pin 1: RX audio – NC for this application
  • Orange / pin 2: +5V on receive (unverified) – NC for this application
  • Green+white / pin 3: PTT – wire to one side of switch
  • Blue / pin 4: unknown, probably buttons – NC for this application
  • Blue+white / pin 5: unknown, probably buttons – NC for this application
  • Green / pin 6: +8V constant – wire to 2.2k resistor, then to positive side of mic
  • Brown+white / pin 7: ground – wire to ground side of mic and to other side of PTT switch
  • Brown / pin 8: – TX audio – wire to negative side of 100μF capacitor, then positive side of the cap to positive side of mic

Looking forward to building a version for the car and seeing how it is for road noise etc.

According to this, increase resistor size to increase mic output level (sounds counter-intuitive, but hey).

Update: that 2.2k resistor should be a 47k. That seems to produce clean audio and keeps the current through the mic element down. I’ve ordered a MAX9812 module to see whether a pre-amp brings the punchiness of the audio up a bit, since it’s a bit quiet as-is.

One thought on “Wouxun KG-UV950P / KG-UV950PL DIY hands free pinout”

  1. Hi Tom I was also playing around with my Wouxun KG-UV950P it has some modulation issues, the modulation can drop off and after switching the unit on and off modulation will come back, So I played around with your circuit to hookup an electret and also injecting a signal from a generator to see when this problems occurs, turns out there is an audio limiter IC D2761 on the front panel PCB I have been looking into that bit of the circuit, cleaned the tracks around pin 4, these are very high impedance, seems to hold up for now. I tested for more than 20min straight modulation.
    Pins 5 and 4 on the microphone RJ45 connector got me intrigued so I had a look at the signals. What I found was varying DC voltages depending on which button was pushed.

    So normally voltage on pin 4 and 5 sit at 5.14 V between pin 7 common
    pressing :
    Main 4.220 V pin 5 | 4 0.966 V pin 4
    Menu 0.992 V pin5 | 5 1.770 V pin 4
    Up Arrow 1.600 V pin 5 | 6 2.360 V pin 4
    Down Arrow 2.190 V pin 5 | 7 4.120 V pin 4
    Exit 2.590 V pin 5 | 8 3.920 V pin 4
    1 4.010 V pin 5 | 9 3.630 V pin 4
    2 3.770 V pin 5 | # 3.160 V pin 4
    3 3.450 V pin 5 | Squelch 4.28 V pin 4
    * 2.950 V pin 5 |

    73 Mark PE0XJ

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