With 12 control functions, the mx-20 HoTT lets the advanced RC model builder to control nearly any model. The use of Graupner HoTT 2.4-GHz transmission technology ensures great functional reliability through bidirectional communication between transmitter and receiver, with integrated telemetry, voice output via headphone output, and ultrafast response times.
The transmitter has 24 model memories. Simplified programming using touch keys. A contrast-rich, 8-line, blue-lit graphic display ensures perfect display of all setting parameters and telemetry data. Telemetry data and additional model memories can be stored on a micro-SD memory card. (later after update)
The channel signal is resolved at 12 bits in 4096 steps, thus providing extremely sensitive control.
USB connection for reading out and storing model memories and for firmware upgrades.

  1. Microcomputer remote control system with state-of-the-art 2.4 GHz Graupner HoTT technology
  2. Bidirectional communication between transmitter and receiver
  3. 5 different languages (German, English, French, later Italian, and Spanish) possible via software update. For availability of the respective language, see Download area.
  4. Servo cycle times of 10ms can be selected for digital servos
  5. Ultrafast response times through direct transmission of the data from the main processor to the 2.4-GHz transceiver with reliable transmission. No additional delays through detours via a module processor
  6. Short aerial, foldable
  7. Operation and programming based on the proven concepts of mc-19 to mc-24
  8. A contrast-rich, blue-lit graphic display ensures perfect control of settings and parameters such as model type, model memory, clocks, and operating voltage
  9. 12 control functions
  10. Free assignment of all switches
  11. 24 model memories
  12. 7 switches/keys, including 2 3-stage-switches, 3 2-stage switches, 2 keys, 3 analogue switches already installed
  13. Modes 1 to 4 are freely selectable
  14. CAP-TOUCH key with key lock function to prevent unintentional operation
  15. CAP-TOUCH display change from main menu to telemetry main menu using the ESC key
  16. Numerous telemetry display, programming, and analysis functions directly in the transmitter display
  17. Voice output can be called up via freely programmable switches
  18. 7 flight phases can be programmed
  19. Extensive programmes for fixed-wing and helicopter models
  20. Swashplate limiter
  21. Voith-Schneider limiter, similar to a swashplate limiter (later after update)
  22. Door Sequencer e.g. to automatically extend landing gear or operate flap drives with process control (later after update)
  23. Servo travel adjustment/B>: can be set separately for all servo channels and for each final value
  24. Sub-trim to set the neutral position of all servos
  25. 2-stage expo/dual-rate system, individually adjustable, can be switched during flight
  26. Mixer functions Programmable failsafe function »Hold« or »Advance to pre-set positions« adjustable separately for each individual servo channel
  27. Stop watches / countdown timers with alarm function
  28. Model copy function for model memories

The set includes:
Graupner HoTT mc-20 microcomputer telemetry transmitter with built-in NiMH 2000 mAh transmitter battery, Graupner HoTT GR-24 receiver, and 100mA transmitter charger
General HoTT features:

  1. Simple, extremely fast binding
  2. Range test and warning function
  3. Low-voltage warning
  4. Extremely broad receiver operating voltage range from 3.6 V to 8.4 V (functional to 2.5V)
  5. Failsafe, free channel allocation (channel mapping); mixer functions and all servo settings can be programmed simply with the HoTT-Smartbox
  6. Binding of any number of receivers for channel expansion (max. of 32 channels)
  7. Up to 4 servos can be controlled simultaneously as a block with a signal repetition time of 10 ms (only digital servos!)
  8. Maximum immunity to interference through optimised frequency hopping and broad channel spread
  9. Intelligent data transmission with correction function
  10. Extremely fast rebinding, even at max. distance
  11. Telemetry analysis in real time
  12. Over 200 systems can be used simultaneously
  13. Future-proof through update capability via USB interface



Dimensions (LxWxH) 190 x 175 x 115 mm
Operating voltage 3,4 ... 6.0 V
Frequency 2400 ... 2484,5 MHz
All-up weight, approx. 770 g
Range approx. 4000 m
Charging rate 210 mA
Temperature range -15...55 °C
Aerial length 120 mm


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