[MarinTeams] Digital Commuications Data Cable

[Bill Smith]

Several people have asked what parts are needed to build a connecting cable from radio to laptop so that a computer can be used for radio-linked emailing.  Several alternatives exist, some of which are described below.

(1) A device called a "Rigblaster" or "Signalink" can be purchased and with additional cables etc.  More information is at: http://www.tigertronics.com/

(2) A cable can be constructed from parts for about $10.  No external boxes or power connections are required.  Unfortunately, cable details vary because of the differing requirements of different model radios.

    (a) If your laptop does not have a serial port feature, a USB-to-Serial Port adapter must be provided.  Not all serial port adapters are usable.  Radio Shack adapters work, but are expensive.  Others are available on the Internet for about $16.

   (b) If you have a Yaesu FT-60, you may wish to consider a CT-44 cable adapter.  The $14.95 adapter connects to the special 4-connection microphone plug on that set and provides universal microphone and earphone plugs.  It is available from HRO.

   (c) Partial parts list if you wish to construct your own cable.

        (1) Connector to radio.  Each radio has its own data connector.  You will have to look at the radio or in the instruction book to determine the correct cable for your radio.    
            (a) The FT-8800 and similar Yaesu mobile sets use a mini-din 6-pin.  If you can find a 3' computer keyboard or mouse extension cable, the needed plug is attached to the cable and makes a neat cable end to the radio.  Surplus cables clipped from an old mouse or an old keyboard unfortunately will not work, as a critical pin is not wired in those cables.
            (b) The Yaesu FT-60R uses the above mentioned 4-connection plug.  You will need to obtain jacks that attach to either the radio or to the adapter.  They are commonly known as 1/8" miniature phone jacks. (tip-sleeve)

        (2) Connector to the computer.  Computers are better standardized.  

            Quantity (2) 1/8" stereo (tip-ring-sleeve) jacks to plug into the sound card line-out and microphone plugs.
            Quantity (1) DB-9 with hood to plug into the serial port.
                The serial port is in the computer, or in the adapter if a USB converter is used.

        (3) An integrated circuit with the identification MCA255 or equivalent.  The MCA255 is an opto-coupler with a Darlington transistor output.

Additional parts such as short sections of small shielded cable, shrink tubing, and resistors to adjust the tone-levels between computer and radio will be supplied.

This treasure hunt is surely daunting to many of you.  We can make group purchases of needed materials and review your radio to make sure you obtain the required parts in our Thursday Communication Classes or during our Hamilton Wireless Association meetings each Tuesday evening.

Bill