Homebrew solution to the Icom OPC-2350LUfor 9700

Discussion in 'Homebrew and Kit Projects' started by G5TV, Nov 24, 2021.

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  1. G5TV

    G5TV Premium Subscriber QRZ Page

    Hi all
    Just looking for help with making a homebrew cable from a FTDI usb to TTL for the IC 9700 data port which is a 2.5 stereo jack. The Icom Manuel shows Tx to tip Rx to ring and ground to body, all those are available on the FTDI board but wondering if anyone has had success doing this cable. The Icom cable is £50+ which seems a tad expensive.
    73 Brent G5TV
  2. W9GB

    W9GB Ham Member QRZ Page

    Icom IC-9700 HF/50MHz Transceiver
    Basic Manual (English)
    Icom Radios have used the CI-V data bus (network) since the 1980s.

    H. DATA JACK [DATA] (p. 13-2)
    Connects to devices to control an external unit or to control the transceiver with 2.5 mm (1⁄10") stereo (TRS) plug.

    I. USB PORT (B TYPE) [USB] (page 13-2)
    Connects to a Personal Computer (PC)

    Connects to a PC or other transceiver for external control.
    Page 13-2 in the Icom IC-9700 Manual.
    DATA Port (2.5mm jack, referenced as H. above)

    1.) Connects a PC through a data communication cable (user supplied), for data communication, DV Gateway 2.5mm RxD functions or remote controlling by CI-V commands.

    2.) Using the optional communication cable, you can use the Icom RS-MS1A application.

    3.) Connecting a GPS unit (NMEA compatible) or GPS output compatible Icom transceiver (Example: ID- 31PLUS) enables the received position data to be displayed on the IC-9700's display.

    FTDI Chip, based in the UK, sells a variety of pre-made cables (sold directly or thru UK distributors — like Farnell).
    FTDI makes a variety of Pre-made cables (3.5mm plug, bare leads, etc.)
    For 2.5mm you can ASK, or use an “Off Shelf” adapter cable 3.5mm female to 2.5mm male.
    Yes, I hear that complaint by USA radio amateurs,
    where $15/hour buys unskilled workers without technical skills — requiring training.
    How many radio amateurs have Basic Tools, Hands-On Skills, or Time/Patience to Build the Cable? Easier to memorize a Question Pool, Get a Piece of Paper, just to Talk (Tech competence Optional)

    DIY Build has been covered, using FTDI USB to UART (TTL) Bridge chips and cables to a specific connector for the past 15 years on Internet (Tech Forums, YouTube, etc).
    Letach Direct (Shanghai, China) sells a pre-made cable (Amazon) for APC products, for less than $15, IF you desire cheap with mixed Quality/Workmanship Reviews.
    FIRST, for DIY —- an important question.
    What is the Voltage Level on that UART (TTL)?
    That answer is likely buried in the Technical Supplements or Service Manual.
    It may even require examining the specific part and looking at a datasheet.

    From 1980 to 2000, +5 V was most common. However, at end of 20th Century, +3.3 V usage began and in the past decade +1.8 VDC began to appear.
    IF 3.3V, you need to select a 3.3V solution — preferable 5V tolerant.
    You have Two Choices using the FTDI FT 232R Chipset series, Breakout or Cable,
    that just require wiring up the 2.5mm connector.
    SparkFun FTDI Basic Breakout - 5V , part number: 09716
    This board uses the very popular FTDI FT232RL USB Bridge IC.
    SparkFun FTDI Cable - 5V , part number: 09718
    This board uses the very popular FTDI FT232RQ USB Bridge IC.
    Last edited: Nov 25, 2021
  3. W9GB

    W9GB Ham Member QRZ Page

    Icom OPC-2350LU option is a complete Cable Kit (variety of radios/interfaces), includes:
    * ICOM OPC-2350LU Interface Cable
    * USB Cable for Android™
    * ICOM OPC-1637 USB Cable
    * 2 Ferrite EMI snap on beads
    FTDI manufactured USB Bridge Cables, variety of lengths, protocols, connectors.
    Sold Direct or via Distributors (Farnell, Newark, Allied, Mouser, Digi-Key)
    ALIEXPRESS (Direct from China)
    NOTE DIFFERENCE (if Ordering from China) Between TxD and RxD wiring
    with Tip / Ring. Must Specify with Order (mistakes can still occur).

    Last edited: Nov 25, 2021
  4. G5TV

    G5TV Premium Subscriber QRZ Page

    Ok thank you Gregory W9GB, so I bought a ftdi board https://www.ebay.co.uk/itm/233996971669 i wired tx to the tip of the 2.5 and rx to the ring with ground to the sleeve. No luck connecting the Doozy software to the 9700. I have the expensive icom cable ( borrowed from a friend) ant that works fine so not sure where I'm going wrong?
    Regards Brent

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