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97.4PL not supported by Kenwood TS-811/TS-711?

Discussion in 'VHF/UHF - 50Mhz and Beyond' started by AD8BU, Oct 10, 2019.

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  1. KA9JLM

    KA9JLM Ham Member QRZ Page

    It looks like these may be the binary inputs.

    14 - J1-6
    15 - J1-5
    16 - J1-4
    17 - J1-3
    18 - J1-2
    19 - J1-1

    1 - IC-19
    2 - IC-18
    3 - IC-17
    4 - IC-16
    5 - IC-15
    6 - IC-14

    There must be power there somewhere. Maybe IC pin 20, J1 pin 7.
  2. KF5FEI

    KF5FEI Ham Member QRZ Page

    Might also check this IC:


    Found another thread where this is used for CTCSS tone generation.
    AD8BU likes this.
  3. AD8BU

    AD8BU Ham Member QRZ Page

    Sorry for not including that information (I was half asleep when I finally got a chance to post the reply). You are right on where the power connection is.

    The information form the Kenwood service manual for the J1 connector is as follows:

    Pins 1-6 are the binary input (T1-T6 in schematic)
    Pin 7 is Power (5C in schematic)
    Pin 8 looks to be high on transmit (TH in schematic)
    Pin 9 looks to be the tone signal (TI in the schematic)
    Pin 10 is ground. (E in the schematic)

    Attached Files:

  4. AD8BU

    AD8BU Ham Member QRZ Page

    That looks to be a programmable microcontroller... To get that to work, I believe we would need the code that is flashed onto the chip to make it work.

    The MC68HC705J1A does have a 20-pin small outline IC package version that seems to match what Piexx used.

    Along these same lines, I saw some generic CTCSS encoders on eBay that used PIC microcontrollers. I am now wondering if Piexx used a custom microcontroller like the MC68HC705J1A as well.

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