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Cable for connecting my Yaesu FT-857D with computer

Discussion in 'Computers, Hardware, and Operating Systems' started by DD5XX, Jul 31, 2015.

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  1. DD5XX

    DD5XX XML Subscriber QRZ Page

    Hello all,

    I would like to connect my Yaesu FT-857D with my computer through USB interface. What cable do I need therefore? I want to perform following actions with the computer and the transceiver:

    • programming the channels, assigning channel names, ... (it is really hard to add/modify/delete many channels directly on the receiver, it takes a lot of time and patient :p )
    • performing PSK31 and other digimodes, I want to try and to start learning that.
    • as I am learning CW, it would be nice, to decode CW signals on-the-fly.
    Any help appreciated. Thanks in advance.

    73 de DO4GR
  2. K5UNX

    K5UNX XML Subscriber QRZ Page

    When I bought the RT Systems software to program the radio, it came with a cable . . . I use that one for what you describe above with my FT-857D.
    KS4YX likes this.
  3. KD2EOM

    KD2EOM Ham Member QRZ Page

    For programming channels and controlling your radio with the computer you would need this cable, the YAESU ADMS-4BU.

    For digital modes you could homebrew this audio cable. I also found this cable for sale on eBay which should work. A third option is to buy a SignaLink USB audio interface and use that. To do digital modes you also need software on your computer, like fldigi.

    Decoding CW would use the same audio cable/interface as described in the previous paragraph. But once again, you also need computer software like fldigi.

    Hope that helps.
  4. DD5XX

    DD5XX XML Subscriber QRZ Page

    It does :) Thank you so much
  5. W9GB

    W9GB Ham Member QRZ Page

    The interface cable between your computer and radio's CAT port, is an RS-232 Level Converter (UART--RS-232).
    For the Yaesu FT-857(D) the Yaesu CT-62 cable (purchased option) provides this connection.
    I likely have that cable in my "parts box".
    The electronics (MAX232 equivalent) inside the CT-62 connector shell is powered by the Radio's port.
    USB option for FT-857(D) interface
    For connection to a computer's USB port, instead of the RS-232 (DE-9M) port, FTDI makes some very nice USB to UART cables. This should work, when properly wired to a MINI-DIN 6-pin connector (same connector type used for PS/2 computer keyboards/mice) for your FTDI cable to attach to the FT-857(D).
    The FTDI cable is powered by the computer's USB port (+5 VDC) which is part of the USB standard.

    SparkFun DEV-09718: USB +5 to UART cable
    Same FTDI cable (w/o SparkFun markings), with tinned leads, from Mouser.
    Mouser Electronics $ 20.00 .... 988 cables IN STOCK.
    Mouser Part #: 895-TTL-232R-5V-WE
    Manufacturer (FTDI) Part #: TTL-232R-5V-WE

    CAT interface for Yaesu FT-857(D)

    The FT-857’s CAT System allows the transceiver to be controlled by a personal computer. This allows multiple control operations to be fully automated as a single mouse click, or it allows a third-party software package (such as GBCAT) to communicate with the FT-8xx without (redundant) operator intervention.

    The Optional CAT Interface Cable CT-62 is a connection cable for the FT-857D and your computer. The CT-62 has a built-in level converter, allowing direct connection from the rear panel CAT/LINEAR jack to the serial port of your computer, without the need for an external RS-232C level converter box.

    Yaesu CT-62 interface cable can be easily replaced with the simple home-made interface (schematic below).
    CAT control programs for YAESU Transceivers:


    Last edited: Aug 5, 2015
  6. W9GB

    W9GB Ham Member QRZ Page


    The CAT port, for the FT-857(D) is the 8-pin mini-DIN connector.
    This port uses a 3-wire serial configuration.
    CAUTION: 13.8 VDC is present on one of the points --
    Cable MIS-WIRING can damage the radio and/or attached devices.


    Mouser part number 171-2608
    CAT/LINEAR Jack (Rear Panel)
    This 8-pin mini-DIN jack is used for connection to the FC-30 External Automatic Antenna Tuner or
    ATAS-100/ -120 Active-Tuning Antenna System.
    It is also used for interfacing to a personal computer for control of the transceiver
    using the CAT system, and for interconnection to the VL-1000 Linear Amplifier.
    FTDI / SparkFun DEV-09718 : USB cable
    RTS, RX, TX, 5V, CTS, GND (RTS is the green cable and GND is black).
    Left to Right, photo below. Pin 1 marked with arrow.
    (notice how the color assignments for resistor color order, in photo).
    CONSULT FT-857D Manual for proper connections to 8-pin DIN connector,
    since Yaesu does not provide RTS/CTS, you may need to jumper/short those wire on FTDI cable).

    1 - BLACK (GND)
    2 - BROWN (CTS)
    3 - RED (+5V)
    4 - ORANGE (TxD)
    5 - YELLOW (RxD)
    6 - GREEN (RTS)
    Last edited: Aug 5, 2015
  7. W9GB

    W9GB Ham Member QRZ Page

    IF you are using the REAR Panel CAT/Tuner/Linear port for
    an automatic antenna tuner or HF linear amplifier,
    THEN another alternative for CAT control exists.

    Bob Wolpert, K6XX documents how to use the front panel MIC (microphone) jack to support a CAT connection to your computer.

    The microphone connector provides serial control capability (CAT),
    IF Menu 059 is changed from NOR to CAT and a simple interface cable is constructed
    (See K6XX document: Using the FT-857 Microphone Jack for Serial Control).

    Other idiosyncrasies with FT-857(D) transceiver.
    Quirks and Undocumented features by K6XX.
    Last edited: Aug 5, 2015
  8. W9GB

    W9GB Ham Member QRZ Page

    Yaesu FT-857D Operating Manual, turn to page 32 (PDF page 34)

    FT-857D CAT/Tuner Port (rear panel)


    The CAT connection uses pins 3, 4, and 5 (on this port) for a 3-wire Serial (TTL) UART.

    Pin 3 - GND
    Pin 4 - TxD
    Pin 5 - RxD

    Three-wire Serial TTL (UART) can be level converted with MAX232 for RS-232 --or--
    Protocol converted to USB standard via a UART to USB Bridge chipset.
    DEPENDING on the Source Serial Device; Conversion device; or Conversion Design used -- the RxD and TxD lines may be connected Straight Through or Crossed (Null modem style).
    Last edited: Aug 5, 2015
  9. DD5XX

    DD5XX XML Subscriber QRZ Page

    Thousand thanks for that brief explanation and all these detailled information. *thumbs-up*

  10. KD2EOM

    KD2EOM Ham Member QRZ Page

    You're welcome! Happy to help :) Good luck setting it up

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