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Homebrew Kenwood TS-850 CAT Cable

Discussion in 'Homebrew and Kit Projects' started by VE3TMT, Nov 20, 2018.

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  1. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    Will give it a try, I have another board the controls PTT, CW keying and RTTY keying, so no worries there.

  2. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    So I tried disconnecting the CTS and RTS, no change. I've reversed the wires, inverted signal lines. Nothing changes.

    I did read since the Kenwood uses hardware handshaking, the CTS and RTS lines come into play. You can just loop them (connect RTS to CTS at the radio side, and also connect RTS to CTS at the computer side. The circuit will then work fine with just the RxD and TxD signals.

    Is this possible, haven't tried jumpering the RTS and CTS on the radio side.
  3. KA9JLM

    KA9JLM Ham Member QRZ Page

    For loop back testing that would work. But if the radio uses those lines I don't think it will help you.

    Try it and see. I would hook a 1 k resistor between them so pull up and pull down works.
    VE3TMT likes this.
  4. VE3TMT

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    No change :(
  5. VE3TMT

    VE3TMT XML Subscriber QRZ Page

    It appears the radio is receiving commands from the computer, but the computer is not receiving commands from the radio.

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