Sommerkamp FTDX-505

Discussion in 'General Technical Questions and Answers' started by LA1QH, Apr 17, 2018.

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  1. LA1QH

    LA1QH XML Subscriber QRZ Page

    Hi all :)

    I have a Sommerkamp FTDX-505 and I am trying to get a Turner Sideband Expander 454c (Crystal mic) to work with the radio.
    I thougt this would be easy with thw wiring diagram underneath the mic and the diagram in the radio manual. But I get a lot of humming when using PTT (in the transmitted signal)... I also discovered that when i unplug the mic (nothing in the mic connector) and turn on MOX I get the same humming.

    I have a Peiker mic that works perfectly on the radio and as soon as i plug in the Peiker the humming are gone.

    Does anyone have a clue of what to do to get it work?

    BTW the cables are connected as followed: RED to center, WHITE to mid section and GROUND to "Ground section on Jack plug.

    73 de LA1QH

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