The Horus Controller with RFD TXMOD is a combination long-range R/C control and telemetry system. It is capable of achieving many miles of range. The system consists of an RFD TXMOD radio module and a FrSky Horus X10S Express.


The TXMOD system uses a 900 MHz frequency-hopping signal for long-range low data rate communication between the aircraft and the ground module. The ground module is attached directly to an R/C controller. The module has a built-in WiFi transceiver. By default, the module acts as a WiFi hotspot. The hotspot is used to access the aircraft telemetry data and to change the settings of the communications link if desired.
The TXMOD module on the ground and the radio in the aircraft are paired and tested before shipping.

Horus Controller

The Horus R/C controller provides power to the TXMOD module and R/C control data to be transmitted to the aircraft. The controller is capable of displaying aircraft telemetry directly on the built-in screen.

Instructions to Connect

The instructions below are specific instructions designed to expand on actions in the aircraft checklist. This information is supplemental and is not to be used as a guide for operations. Please follow the aircraft checklist for procedures and instructions for when to power on the aircraft.
For aircraft equipped with a TXMod and a Network radio (such as a Doodle or Silvus), either the TXMod or the network link may be used to connect to the flight controller. Both connections may be used independently and simultaneously.

Connect to TXMOD Access Point

  • Power on the Horus controller using the red power button on the face
    • Press and hold the button for three seconds to power on
    • If there are switch warnings, please place the switches into the desired positions before proceeding
    • Note: A warning may appear to alert the user that telemetry alarms have been disabled. This is part of the current TXMOD configuration and can be safely ignored. Future updates will alleviate this error.
  • Power on the aircraft *when safety procedures allow*
  • Use you ground station computer or tablet to connect to the WiFi hotspot generated by the TXMOD unit
    • SSID is the aircraft designation
      • This may be changed in the TXMOD settings
    • Default Password: 1BigDroneRadio

Connect with Ground Control Software

Using Mission Planner
  • In the top right corner select the drop-down menu and pick UDP
  • Enter 14550 for the local port and click ok
  • Wait for the parameters to download
  • You are now connected
Using QGroundcontrol
  • Select the Purple icon in the top left of the screen to go to settings
  • Select Comm Links in the sidebar
  • Click Add at the bottom of the screen
  • Enter a name for the Vehicle
  • Choose type UDP
  • Enter 14550 for the listening port
  • Leave target hosts blank
  • Click Ok
  • Select the new link in the menu
  • Click connect
Android or iOS
  • Select the Purple icon in the top left of the screen to go to settings.
  • Enter a name for the Vehicle
  • Choose type UDP
  • Enter 14550 for the listening port
  • Leave target hosts blank
  • Click Ok
  • Select the new link in the menu
  • Click connect

TXMOD Settings

The TXMOD unit hosts a webpage that can be used to access and change settings on the unit. Here it is possible to change the settings of the WiFi Access Point and the RFD radio settings.
  • Connect to the TXMOD Access Point over WiFi
  • Open a browser
  • Navigate to
    • You will see the following page
  • Go to “General Settings” to change Wifi settings
  • Go to “RFD900x Radio Settings” to see and change settings for the aircraft radio units
  • Be careful making changes to the radio module as incorrect settings will cause the link to disconnect. Once disconnected the ground radio can no longer change settings on the air radio. See RFDesign User Guides for more detail


The current reading displayed on the Horus is not accurate, we are currently working on a fix for this issue.
  • Connection to WiFi Access Point established, but can not connect with a ground control software
  1. 1.
    Close and reopen Mission Planner or QGround Control.
  2. 2.
    Close Mission Planner/QGround Control. Reboot Horus Radio and aircraft and then reopen software.
  3. 3.
    Make sure computer firewalls are set to allow Mission Planner or QGroundControl Communication over the WiFi network.
TXMOD Alta X kit does not currently support custom PWM ranges for RC failsafe. This is particularly important to know if you are using 3rd party accessories controlled by PWM such as retractable landing gear.
TXMOD uses an RFD900X radio operating on the 900 MHz frequency range. Using TXMOD with the FRX 900 MHz movi controller radio at the same time can result in decreased performance and in some circumstances interference. It is not advisable to use multiple radios of the same frequency on the any Freefly Systems aircraft.