FAQ Schematics for Board V1.41 (blown D1B/D2B diodes)

Discussion in 'X-108' started by hb9eue, May 14, 2022.

  1. hb9eue

    hb9eue Junior Boarder X-108 Member

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    Hi fellow OM's

    After my X108g broke the second time I threw it into the 'spare parts' bin.

    Now (about 3 years later) I decided to have a go and debug the issue. I supposed the RD16HHF1 to be blown, desoldered them, but my component tester showed they have both similar and matching characteristics.

    So I went on checking component on the TX path until I came across D1B and D2B on the SWR measuring circuit towards the antenna socket. One being open, and the other acting as a 6ohm resistor, that is not quite right! :)
    So I went looking for a schematics to find what kind of diode this should be. Unfortunately I only find schematics for newer revisions of this board, where those were replaced by SMA shottky diodes.

    Does anyone know, what they used on my board? Does anyone know where to find schematics for my revision? Or could I just use any shottky diode? I guess they all have similar specs.

    73 de HB9EUE

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