IC-9700 Connecting a GPS

Discussion in 'Software Defined Radio (SDR)' started by KB3TCB, Jun 26, 2019.

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  1. KB3TCB

    KB3TCB Ham Member QRZ Page

    The IC-9700 uses a 2.5mm Stereo jack to connect to the GPS signals. There is no power outlet provided on the IC-9700 to power a GPS. It is important to note the IC-9700 GPS connection requires asynchronous serial RS-232 compatible signals, a USB GPS will not work.

    Given the requirement for a RS-232 compatible signals and a power source I chose the Garmin 18x PC GPS Navigator Unit.

    Garmin 18x PC GPS is an excellent GPS which has separate contacts for both power and the GPS signal. The Garmin 18x PC 12v Cigarette Lighter Adapter accepts power between 8 and 30 volts so it will easily connect to the standard 13.8 power supply for the radio itself. The GPS signals use a DB 9 Pin Serial Connector with the required signal type and levels. See the specification sheet at


    The second item was a Cigarette Lighter Female Socket and cable to connect the Garmin 18x PC to the 13.8 volt power source.

    The third item was a 12 Foot 2.5mm Stereo Headphone Extension Cable that will be modified to connect the Garmin 18x PC DB 9 Pin Serial Connector to the IC-9700 2.5 mm socket.

    The fourth and last item is a DB9 9 Pin Male Solder Type Connector which replaces on end of the above 12 Foot 2.5mm Stereo Headphone Extension Cable for connection to the Garmin 18x PC. The two cables are allow the GPS to be place at some distance from the IC-9700 itself.

    The Garmin 18x PC GPS along with the cables and connector makes for a very easy installation requiring only one modification. That is the replacement of one end of the 12 foot 2.5mm Stereo cable with the DB9 connector.
    K0DXT likes this.

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