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Lafayette LR-20 MPX Board

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    Lafayette LR-20 MPX Board

    Needing some help to get this MPX board working again. General investigation shows a busted variable inductor location T14. Looking at the schematic T14 and T15 are the same inductance value. Unsoldered T15 value measured was 6.3 mH. Coil was manufactured by Toko of Japan. Doing some research it appears that a 369SNS-1668Z is in this range. Also slug color is blue. Any guess where I can purchase this coil from and a price. Checked the usual Digikey, Mouser, and Newark no luck. Coil fits Toko 5KM series.
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    #2
    Re: Lafayette LR-20 MPX Board

    And what is the malfunction of the mpx board , maybe the capacitors C301/302/330 are faulty

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      #3
      Re: Lafayette LR-20 MPX Board

      Nope T14 has the metal shield and slug missing. coil is busted and measures infinite or open. Found a 8.6 mH coil on Digikey for $2.42, however shipping charge $25.00. So I hope it will adjust from 6-9 mH. Checked dimensions with dial indicator and matches physical size for pc mount. T15 has the same part number and checked good at 6.3mH. Tested in Sencore LC 103 and adjusted from 4mH to 7.6mH. Could not find any specs on adjustment range on datasheets other than tolerances of +10 -10 %.

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