The Weatronic Dual Receiver product line was developed in Germany by a skilled team of electronic telecommunications and information processing specialist. Operator's Manual

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 ultra light 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 high-performance 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 thousandth 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 being stored on the SAD/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. Additional, ultra-bright LED can be connected. 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

DS8711 Ultra Torque Servo
 

The unmatched power of JR’s DS8711 standard-size digital servo is nothing short of astonishing. But the 8711’s story doesn’t end with its awesome power.

The 8711 also has all the speed, the holding-power and the zero-dead band precision that have made JR digitals the choice of serious RCers right from the start. Plus it’s also the first JR digital to feature an aluminium heat sink section for optimum reliability.

Key Features

• Anodized aluminium heat sink
• 403 oz/in torque
• Greater strength and holding power
• Drop in replacement

Beyond the multiple-receiver setup, made possible by the AR9000’s ingenious design, the addition of an integrated Data Port allows pilots to truly fine tune the antenna and remote receiver placement. By utilizing this Data Port and an exciting new tool known as a Flight Log, pilots can now see if individual receivers are subject to fading or overall frame loss during a flight. For the first time ever, pilots have the ability to eliminate the radio signal part of the equation if there are issues in flight. The Flight Log can be permanently mounted in your fuselage or you can plug it into the Data Port after a flight. The flight Log will indicate if there has been any data loss in any of the 4 receivers. The truly remarkable aspect of the Flight Log is that, even though you may never feel or notice a signal loss while flying, nothing gets past the Flight Log. For the first time ever, you can truly rate your RF link performance and make appropriate changes to your mounting setup to correct and resolve any potential issues thanks to the Flight Log. If your RF link checks out, this can indicate that you may have a problem elsewhere, such as low receiver pack voltage or a failing servo. The Flight Log will display the voltage of the receiver pack for you as well.

The groundbreaking Spektrum Air Module Systems allow you to upgrade your current module-based transmitter to DSM2 specs easily and affordably. When combined with the AR7000 and AR9000, you have one of the safest and most secure RF links available while maintaining all your existing model setups. In addition, those who enjoy flying parkflyers can even utilize the tiny AR6100 receiver as well, opening up even more opportunities. There is simply no better time to upgrade your existing radio system to Spektrum 2.4GHz technology than now.