X-108 Info X108G outdoor - PA initial currents

Discussion in 'X-108 TRX' started by Victor, Jan 29, 2018.

  1. Victor
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    Victor Beginner X-108 Member

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    Hello, folks!

    Did anybody experiment with the Power amplifier stages initial currents?
    What values do you have in your transceiver? Appreciate for your replies.
     
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  2. Bartek
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    Bartek Beginner X-108 Member

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    Hi
    I have not experimented, but in the manual it is described as follows:

    Power amplifier unit static debugging

    1) Set the receiving frequency of X108G to be 14.25000MHz, [USB] mode.
    2) Unplug the TX signal line from small signal board to the power amplifier board.
    3) Connect the RF load to the antenna interface of the X108G.
    4) Disconnect R81B、R82B、R79B、R80B solder joints.
    5) Connect a dedicated test microphone to X108(disconnect the microphone input), then press PTT to start
    the transmitting, and record the current ammeter value as a baseline reading.
    6) Solder four debug solder joints, adjust the corresponding Potentiometer, start the transmitting to make
    the value of additional current are as follows:
    Solder joints Potentiometer Additional current
    R81B RW4B 30mA
    R82B RW2B 250mA
    R79B RW1B 300mA
    R80B RW3B 300mA
    Notes:
    When debug a joint, other 3 joints must be cut off.
    Must solder 4 test joints after debugging. Please cut off the radio power when soldering.


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