So far, responsible model pilots had to invest considerable expenditures, in order to equip their large model, be it a TOC machine, a scale model, a jet or a helicopter with a safe governing system. The operation hazard, which is not small, emanating from large and partly very fast model planes requires maximum functional safety. Besides a high-class Dual Receiver, possibly featuring PCM modulation control, one servo energy supply for the connection of two batteries has been required so far, in order to trigger the numerous and strong servos safely and to minimize the risk of a power supply failure. As soon as several servos are acting on one control surface - as it is typical for the ailerons, rudders, and elevators - an additional servo adjusting device has typically been required, in order to synchronize these servo machines. Especially the experienced
model plane pilots have often been using an electronic stabilization unit in addition, better known as gyro. For helicopters, a gyro is mandatory. Those who wanted to use the ultralight Lithium-Polymer batteries had to rely on a voltage regulator which reduces the voltage from 7.4 to the rated voltage of the servos as well as of the Receiver, or he needed an appropriate electrical energy supply module which functions in combination with these batteries.
Specifically safety-minded pilots of large models have even built in a second Receiver (which is mandatory in France for the large models), in order to gain more safety in case of interferences.

Weatronic Dual Receivers represent an integrated on-board electronic system which complies with these requirements in one single unit.Weatronic Dual Receivers provide much more performance features than traditional remote control receivers. One single device includes a highly modern digital diversity receiver with two completely separated input circuits and two antennas, including a highperformance power supply system for strong servos, which are fed by two power sources with peak current capability. Maximum attention has been given to simple handling and maximum functional safety during the development of the Dual Receiver. Its immunity to interferences of any kind, its tuning precision and the enormous usable range may be unique on the market for model plane electronic systems. Furthermore, no alternation of crystals will have to be used any more, because the Dual Receiver itself is conducting the frequency selection (so-called synthesizer).
Its full performance is being developed specifically by the combination with the high-end PCM transmitters of the makes Futaba and Graupner/JR. It is recommended to operate weatronic Dual Receivers together with the actually best and safest types of modulation from JR/Graupner, i.e. the SPCM procedure or the Futaba PCM 1024. But for users of PPM transmitters such as the Multiplex brand, Dual Receivers will function with this procedure as well. Dual Receivers are suited above all for larger and largest Acro-Prop models, scale models, helicopters, and specifically for turbine-powered jets and helicopters also. Large and the largest gliders also are using the advantages of their enormous safety reserves and comprehensive scope of functions.

• The EDP functions of the Dual Receiver are taken over by a 16 Bit CMOS microcontroller of the latest state of the art. It controls the electronic units described below. It evaluates above all the field strength of the two receiver units and processes the individually better suited signal. This is executed within a range of one ten thousendth of a second.
• Two identically structured twin Superhet receivers with two antennas are taking over the reception and the further processing of the radio signals, where the individually first mixed frequency is being generated by a digital DDS (Direct Digital Synthesis) synthesizer. Their demodulated low-frequency signals and field strength information will be transmitted to the processor. The channel selection is conducted automatically, without any need to change crystals. The Dual Receiver features an extreme tuning precision and immunity to interference, a high sensitivity and a very large usable range which is clearly beyond the range of traditional receiver systems. It has 12 channels respectively.
• One power unit supplies the required current for the servos (12 or 20 outputs) and has been designed specifically for high current peaks of modern digital servos. It regulates the control signals to the required level and screens the servo lines. The supply lines can therefore be as long as required by the type of the individual model, and they require no additional screening by means of ferrite cores. But it is recommended to use stranded servo lines only.
• Four voltage regulator are integrated in the power unit, which generates a constant 6,0 V for the servos.The receiver unit is supplied with an extra voltage regulator with the optimum voltage. It is fed by two batteries, one main battery as well as one backup battery of equal or smaller size, which will replace it in the event of an emergency (e.g. a defect of one cell, a short circuit or an empty condition of the main battery). 7.2 Volt NimH batteries (6 cells) as well as 7.4 V LiPo batteries (two cells) may be used.
• High-performance and low-loss P channel MOSFETs will take over the switching between the batteries.
• The course of the battery voltage, the current consumption, field strengths of the radio signals received, the number of the valid and the failsafe frames, the antenna used, the switching over procedures between the receiver units, the positions of all connected servos, and the service temperature will be stored on the SD/MMC card. The incurring data volume amounts to approximately 8 MB per hour, i.e. a 64 MB card will last approximately 8 hours, a 512 MByte card even well over 48 hours. When using more SD cards, the recording period can be extended in any way. But an SD/MMC card is not necessary for the operation of the Dual Receiver.
• When using the version with GPS data logging function, more flight data such as speed, height, distance from the starting point, position etc. will be stored.  The flight and operation data beeing stored on the SD/MMC card can be transmitted to the PC by means of a USB card reader.
• Firmware updates from the weatronic homepage can be stored on an SD/MMC card and be transmitted by it to the Dual Receiver.
• Thereupon the update will be conducted automatically. With the Dual Receiver type 12-20 R Gyro, an on-board gyroscope (gyro) takes over the stabilization of the longitudinal axis (aileron). Its sensitivity can be adjusted continuously. An additional gyro can be connected to all Dual Receivers and be allocated to any of the outputs.
• An electronic switch provides the fail-safe operation and a vibration-resistant function. It will be triggered by an external ON/OFF switch in the control board, ideally mounted at the fuselage. The on-board electronic system remains fully functional in case of a failure of the external switch. The external control board has three functions: Switch on/off, start transmitter finding, indicate battery operation and condition by means of a red LED.
• All stored flight and operation data are displayed by means of the graphics software. All functions/channels can be configured individually for the desired fail-safe positions. In addition, it is possible to check out the fail-safe settings in flight by means of a free channel.
• The dimensions are: 112 x 77 x 25 mm, weight 170-183 grams