AeroLink RFD Adapter Board – User Manual

Table of Contents
  • Introduction

    The AeroLink RFD Adapter Board is a quick and simple way to install a RFDesigns modem into your chosen vehicle or application. This simple product allows you to connect to the modem with a standard JST-GH cable whilst also allowing for an external power supply to be used to power the modem, as is recommended by industry professionals.

    Reading this Manual

    To make reading this manual easier, we have included several different coloured callouts to highlight essential information, safety warnings, tips and tricks.

  • Regulations

    Most countries have regulations in place that govern the use of different radio frequencies. It is up to the user to ensure that they are operating within their local restriction.

    For more information regarding the use of radio equipment in your area, please contact your local authorities.

  • Overview


    The AeroLink RFD Adapter Board is a modem mount that provides seamless integration between the RFD900 modem series and your vehicle. Eliminating the need to carry specialist items (such as FTDI cables), the Adapter Board can connect COMs (serial link) and power via a standard JST-GH cable, or power can be supplied through an external source (recommended).

    See “Configure Your Power Input” below.

    The AeroLink RFD Adapter Board is compatible with the RFD900+, RFD900x and RFD900u modems. While the RFD900u modem requires soldering, the RFD900+ and RFD900x modems can be quickly and easily changed or replaced when needed.

    This product is suitable for all UAV and UGV applications where a wireless serial link is required. Ideal for users of all experience levels.


    1 x RFD Adapter Board
    1 x 15cm 6 Pin JST-GH Cable
    2 x 3 Pin Right Angle Header Pins
    3 x M3x6 Mounting Screw
    1 x M3x10 Modem Retaining Screw

    Adapter Board - front and back view


  • Quick Start Guide

    Configure Your Power Input

    The AeroLink RFD Adapter Board can be configured to power the modem via an external/separate power source or an internal source (the same source as your flight controller).

    You will need to configure the Adapter Board before installing your modem.
    The modems should NOT exceed 5V, regardless of how your system is configured.
    It is recommended that you supply your telemetry modems with an external supply, separate from your flight controller or sensitive electronics. This can be a separate BEC or regulator.

    Selecting a Power Supply

    Selecting between different power sources is done via the jumper pads on the rear of the AeroLink RFD Adapter Board.

    Power supply

    External Power Source (Recommended):

    By default, the AeroLink RFD Adapter Board is designed for use with an external power supply. It is manufactured with the jumper for External Power already closed by an internal trace.

    To connect an external power supply, solder the provided right-angle header pins or your wires directly to the power ports.

    The JST-GH connector is used for your serial link.

    Even if you are using an external power supply, there is no need to modify the JST-GH cable.

    External power connected

    Flight Controller Power:

    Closing the jumper between the center and right-hand pads will allow the system to draw power through the JST-GH cable (refer to Power Supply Diagram). This often means drawing from the same power lines as the connected flight controller or other sensitive electronics. This is not advised but may be required for some applications, such as:

    • Power limits
    • Vehicle size restrictions
    • Other redundancies in place

    PPM Connector

    This can only be used in the RFD900x modems!

    The PPM connector allows the RFD900x modem to be used as a range extender for RC signals to the vehicle. The connector joins the RC IN port on the vehicle.

    This function is reserved only for the RFD900x modems and may still require setup through software. See the RFD900x manual for more details.

    Installing the Modem

    Installing a RFD900+ or RFD900X modem:

    1. Configure power input for your preferred power supply.
    2. On the front side of the Adapter Board, slide your chosen modem onto the header with the heatsink facing up.Install Modem
    3. Secure the modem with the M3x10mm screw.
    4. Connect antennas to your modem.
    5. Connect the JST-GH cable to your AeroLink RFD Adapter Board and your flight controller.
    6. Confirm this is connected if using an external power source for the AeroLink RFD Adapter Board.
    As with all radio equipment, powering the system without antennas being installed can damage the modem. Always connect the antennas before powering.
  • System Pinout