2,4GHz Conversion System

S3D Transmitter conversion system to 2,4GHz

- Stay with your transmitter, fly 2,4GHz -

As a 2,4GHz radio for our customers, we wanted to have the best possible 2,4GHz RC-system, better than every existing system out of the 1st generation. Our demand was very high, as the existing systems are already working quite good. But we made all efforts to reach our goal.

We wanted to have the technical maximum for radio control with 2,4Ghz technology and we didn`t want to use usual, simple modifications of data transmission systems.

The S3D-T 2,4GHz Conversion system with telemetry



The S3D-System of the 2nd generation is based on a maximum of security on the transmission path and for highest application comfort. These goals we have reached with:

  • Transmitter antenna in the front of the transmitter, only in this position the best radiation can be guaranteed
  • Always 2x active working 2,4Ghz systems, in transmitter and receiver. For highest data rates, hardware redundancy and transmission and reception diversity
  • Simple mechnical conversion for existing transmitters
  • Bi-directional data communication, the receiver transmitts data to the transmitter, for telemetry and security
  • Hardware Redundancy and Data redundancy
  • Dual FHSS frequency hopping, 2 x 100mW output power
  • Antenna screw system, type SMA
  • Bi polar transmitter- and receiver antenna
  • Down link system for model and receiver data and external sensor data
  • Up to 16 proportional channels
  • High speed data transmission

A transmission system with 2 antenna at transmitter is perhaps a bit unusual, OK. But the special physcis on 2,4Ghz can`t be “duped” (with only 1 antenna). To be the fastest and the most secure user on the 2,4GHz data highway, it needs such kind of technology. Like seen on most of the high class WLan routers. All these are equiped with 2(or more) antenna and 2 internal, independant working systems.

 “ Design follows function”. It follows, that for a 2,4GHz system,

the 2 transmitter antenna must be placed in front of the transmitter, with a certain distance between each other

S3D - the sytem with 2 active working transmitting system and 2 active working receiving systems for hardware and data redundancy

unique in the world

Transmitters to be converted

Graupner MC-18/MC-20/MC-24, MC-19-MC-22S

MX-12/MX-16, MX-22/MX-24


Hand transmitters

MPX 3030/4000

Royal Evo

MPX Cockpit MM






MPX 2010

MPX Cockpit SX

Old transmitters

Futaba T-12

Futaba 9ZAP

Futaba TM-14


For more details please click on pictures

With the ACT S3D conversion, all existing transmitters can be extended to 2,4ghz, in addition to the existing frequency in the transmitter.

An S3D-2,4GHz-extending system consists of:

1.) The existing transmitter     2.) An S3D 2,4Ghz TX module     3.) An S3D receiver

For telemetry, it is needed in addition

1.) An S3D receiver with sensor input  2.) Sensors, M-Bus compatible    3.) A display


2,4GHz TX modules

2,4GHz S3D receivers

Conversion sets

S3D accessories



Switch IT
Frequency band switching for tray transmitters  

Industrial comparison test 2,4GHz systems

The S3D-System was developped for the conversion of existing transmitters to the new 2,4GHz technology, using the 2,4Ghz advantages with the comfortable frequency management.

The  S3D-System can be used with existing transmitters, the so far used frequencies (35/72Mhz) can be used further more. So far used models can be used with 35/72 Mhz, new models can be equiped with the latest 2,4GHz technology.

The S3D-System can even be installed in a  transmitter tray. Tx module and Tx antenna are installed in the tray. Then, the transmitter itself doesn`t need any change or conversion.

The S3D-system consists of a Tx-module 2,4 Ghz, which can be connected with adaptor leads to every existing transmitter.

The S3D Tx-module 2,4 Ghz is very small and flat, it can be attached outside of a transmitter, installed internally or in the module space of the transmitter or in the transmitter tray.

Every TX-module is working with 2 internal 2,4GHz transceiver systems and PA with fully duplex diversity technology.

The S3D systems offers 4 different types of receivers, 10 channel,  8 channel, and 6 channel, 4 channel or a combination of alle 4 types for to extend the amount of channels and servo outputs. The system supplies up to 16 channels, and up to 40 independant, separately adjustable servo outputs. 

Each receiver  works with 2 internal 2,4GHz transceiver systems with fully duplex diversity technology. Each receiver has 2 antenna, at S3D-8 and S3D-10 the antenna are with screw sockets for best and practical installation.

All S3D receivers can be linked via a DSL data lead. In that case, 4 transceiver systems are active in reception and are working together as a 3-D diversity system, the highest reception security which can be reached.

All S3D receivers can be set up with the SPS system.

Technical details

Technical Data, technical describtion

S3D transmitter conversion system 2,4Ghz

  • All existing transmitters convertible
  • ETSI 2008 compatible, FHSS System
  • Antenna always in front of the transmitter for best radiation performance
  • Dual Frequency hopping system FHSS
  • 2 independent working transmitter RF systems
  • 2 separate data streams
  • 2 transmitter antenna for 3-dimensional radiation, removable
  • 2 x 100mW output power
  • Antenna screw system, type SMA
  • Bi polar transmitter- and receiver antenna
  • Down link system for model and receiver data and external sensor data
  • Up to 16 proportional channels
  • Each transmitter, with PPM 5-12 can be used
  • High speed data transmission
  • Designed and produced in Germany

S3D DSL receiver system

  • Two complete receiver systems in one case, working internally as 3D Diversity system
  • Dual 3D Diversity system, when two S3D receivers are linked via DSL port
  • Antenna screwing system, type SMA
  • Bi polar transmitter and receiver antenna
  • Down link system for model and receiver data and external sensors
  • Different antenna length can be used for best installation in the model
  • Antenna extension leads can be used
  • ACT SPS system for servo programming in the receiver
  • High current power supply connector type DSQ
  • Designed and produced in Germany

These features are offering the following benefits:

  • The complete system, receiver and transmitter, is working with hardware redundancy
  • 3D radiation and 3D reception are resulting in smallest problems possible if barriers are in the line of sight
  • Optimal position for the transmitter and receiver antenna increasing radiation and reception results
  • With dual data transmission and dual frequency hopping the system can reach a perfect data stream
  • Dual 3D Diversity technology results in best reception and highest signal to noise ratio
  • Easy installation for the receiver antenna, as the antenna can be used with different length in different directions, up to 4 positions on the model: left, right, below and on top of the model. Guaranteed sight at all times between transmitter and receiver antenna
  • Using S3D technologies nearly no interruption of the line of sight is possible
  • The down link has a range up to 1000m, it can be used for all kind of data which can be created with sensors or with internal data in the receiver. These data can be shown with an external display or ear phone aso. Some receivers are offering sensor inputs for hight, speed, temperature, aso.
  • M-Bus downlink system, compatible wilth all M-Bus sensors
  • The transmitter module can transmit up to 16 proportional channels
  • Additional proportional channels can be connected to the transmitter module at its external channel port.
  • High speed data transmission, 20ms at 16 channels, (normal transmitters 12 channels with 24ms)
  • High speed data transmission, 10 channels with 14ms
  • Super high speed data transmission with 5 channels at 8ms. Double as fast as HRS
  • The transmitter can be used with PPM-5-12. That means every existing model memory can be used without any change. No reduction in function channels when using PCM transmitters
  • 4096 steps (12bit) resolution at servo outputs for maximum servo speed and precision at highest servo power 
  • Some receivers are offering an big internal data memory for data logging during use and read out after use
  • All S3D receivers with DSL port can be combined to a dual 3D diversity system with 4 antenna
  • All receivers with DSL port are offering the advantages of the ACT DSL-SPS system. Each servo output can be set up for each channel separately. Adjustments are: Servo throw, servo speed, servo limit, servo centre, servo offset, Fail Safe, Hold, battery Fail Safe, RSSI Fail Safe, and 4 level mixing for each servo output
  • The S3D-10T- and the S3D-8T receivers are offering an additional high current power supply connector for the power supply of high current servos in high amount, directly connected to the receiver outputs. Additional power supplies for the receivers are NOT necessary anymore, following the rule:  Parts not installed can’t fail…..