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Thread: Schematic for CAT-62 to CAT62USB for FT-100D Needed.

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  1. #1

    Default Schematic for CAT-62 to CAT62USB for FT-100D Needed.

    Anyone have a link to this? I have been searching one and finding it to DB9 then convert to USB. However Ebay is sales cables that are CAT62USB. I have the CAT-62 6 pin cable open ended. Looking at t he pictures of the cable I am looking for doesn't look like there is any mods. to it other than soldering the wires to a USB plug. I want to use this with HRD. Any help would be appericated.


  2. #2
    Join Date
    Mar 2007
    Christchurch, New Zealand


    You could just connect the wires to a USB connector. But it won't work. You could connect them to a DB9, and that might work. (CAT-62 probably needs a level shift from the RS232 levels to whatever the radio needs. I don't know. The Icom CI-V converts RS232 TX and RX levels to 0-5V on a single wire to/from the radio.)

    USB is a fairly complex protocol and USB-CAT62 cables have a processor in one of the plugs to talk to the computer USB port and provide the correct levels to the radio.

    Edit: I've just seen in QST an advertisement for a "USB Rigtalk CAT/CI-V" which makes me think that CAT and CI-V may use the same levels, so a direct connection to a DB9 almost certainly won't work (and might damage the radio -- a lot of logic doesn't like -12V).

    I'd buy a commercial one, or make an RS232-CAT/CI-V converter ( a couple of transistors and use it with a USB-serial converter.
    Last edited by ZL3GSL; 07-03-2009 at 12:36 AM.

  3. #3


    I have the CAT-62 6-pin cable open ended.
    Are you sure?
    Turn to Page 30 and page 96 in your FT-100D manual. Don't have a manual?, look here:

    The 6-pin mini-DIN is used for Digital/Data connections (Radio to PC Sound card (DSP) I/O).
    This is the CT-39 cable

    For Computer Assisted Tuning (CAT) you should have an 8-pin connector (BAND DATA) cable pigtail on your FT-100.
    DO NOT confuse these 2 seperate functions -- they are entirely DIFFERENT.

    Think of CAT as the Remote Control of the FT-100 radio's internal microprocessor (that's it!!).
    Digital / Data ports are largely from radio IF/AUDIO chain and require connection to the DSP chip inside a sound card (seperate expansion baord or on your PC motherboard.) This is used for PSK31 and other digital radio modes.

    PSK31/SSTV/ Soundcard programs with the FT100
    Operating soundcard programs like PSK31 is accomplished by using the DATA Jack on the rear panel of the radio. The definitions of the jack as provided on pages 20 and 21 of the manual are:

    Pin 1: Data In (AFSK input for soundcard)
    Pin 2: GND
    Pin 3: PTT
    Pin 4: 9600 Baud out
    Pin 5: 1200 Baud out (audio out for soundcard)
    Pin 6: Squelch

    CAT is the Yaesu computer control for the FT-100D radio ---
    you require a TTL-to-RS232 or TTL-to-USB LEVEL CONVERTER (see page 96).

    OE1RIB - CAT interface cable (level converter)
    CT-62 and FIF-232C equivalent Yaesu FT100 CAT interface to allow remote control of your radio from your PC. It can be used as a stand alone interface or is ideal when used in conjunction with Digimode interfaces such as Sigmalinks and Rigblasters.

    As it turns out, the FT-100 is somewhat crippled in its CAT command set. It just isn't possible to set AGC, Noise Blanker, DSP settings, and some other things like I had hoped. It isn't a limitation of HRD though, rather a limitation of the FT-100 control design.

    Previous QRZ Q&A thread on topic

    Yaesu FT100 FAQ -- K0LEE

    ZLP Electronics - Neil Crook, G4ZLP
    Last edited by W9GB; 07-03-2009 at 01:17 AM.

  4. #4
    Join Date
    Jan 2000
    Kilowatt Alley


    At any rate you would need to come up with a set of drivers for the usb cable which only complicates matters further.
    "Oh what a tangled web we weave when first we practice to receive."
    -Otto Watt Sept. 5 1925

  5. #5
    Join Date
    Mar 2007
    Christchurch, New Zealand


    You shouldn't need drivers ... a commercial USB-CAT cable will install as a serial port with Windows XP, and "probably" with W2k, and Vista. The sellers wilol tell you about this.

    The advantage of the USB-CAT cable is that it's only two pairs of connectors involved (one for each end) not the three pairs needed with a USB-serial cable used with a serial RS232 to CAT converter.

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