Graupner Hott Use Notes

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Graupner Hott Use

-Under Construction- We welcome user contact and information.

General Information and Tips


We are NOT experts on the Graupner Hott system. We did implement and thoroughly test their single wire 'digital' SRXL Protocol SUMD. Aura can get 12+ channels of data on a single wire using SUMD.

The specific equipment we have tested and flown includes an MX-16 transmitter, and GR16 Receivers. It seems difficult or impossible to find published data on what SumD format the different receivers support (or default to).


  • Update your transmitter to the latest firmware.
  • Update your receiver to the latest firmware.
  • With your receiver bound, go into your transmitter menu structure following its instructions (sometimes in Telemetry menu) and Enable SUMD (This must be done, it is not done/on automatically/by default). Note which pin/servo port the SumD is assigned to on your Rx Bus.
  • Taking extra care with the polarity, connect the SumD Rx port to servo Port B of the Aura using one male-to-male cable.
  • Most of our testing has been with SUMD of 8, and of 12.
    • It seems the GR16 defaults to SumD of 8 (using our MX-16)
    • It seems the GR12L may default to SumD of 12 (using our MX-16) (Not Confirmed)
  • The GR16 is easiest to use on PNP aircraft like the QQ Extra and Cessna 170, or with Quick Set on the Open Stock Aura. Aura can Auto-Detect SumD of 8 (unless Auto-Detect is disabled, refer to your products user guide.)
  • Some Graupner transmitters or devices may allow you to re-program the SumD channel count?
  • As needed, use the Aura Config tool to go in and select the correct radio settings for Aura
Graupner -> Graupner SumD -> On Port B -> SumD of 8, or 12 etc.
Other than this, Aura is used normally. Normal methods of programming including the New Aura Config File Wizard are supported.
  • Once connected successfully, Aura will have:
    • Solid Orange LED - Power and Calibrated Sensor (blinking is movement during sensor calibration, using last good)
    • Solid Green LED - Valid Radio Data Source (blinking is error/wrong channel count)
  • Turn on the Aura Live Data/Input Monitor to see your input commands and validate functions.
    • The stick motions on the screen should mimic those of the transmitter.
    • Assign a 3-position switch to the Tx CH5. Used as CH5/Flight Mode change in Aura
    • Assign a switch (or other) as needed to CH6 and CH7 to use for flaps, etc. as desired.
    • Assign a knob (or other) as needed to CH8. This can be used as Aura master gain if desired.
    • Other channels can be added if available. Aura's Channel # should match the transmitter.
  • Tx Flight Control directions into Aura Input Monitor should be correct with default/normal Tx servo reversing.
  • Set transmitter travel per normal Aura directions (125% Aileron, Elevator, Rudder, 100% others)

Installing your Aura

General information regarding Installing the Aura.

Additional information for Large Aircraft Installs.