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Old Sep 01, 2008, 05:55 AM
Julez is offline
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Joined Dec 2003
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New Product
Jeti 2.4GHZ system with telemetry, easy-to-use sensors, and audio alarm!

The most popular module-based system in Europe.

No empty promises - just actually available products, that thousands of pilots already use.

Know nothing about Jeti Duplex? Feeling overwhelmed by the long text and tons of photos? No problem, I'll explain the main features briefly here, in the first paragraph of the posting:

Jeti offers upgrade modules for practically every transmitter, that has a PPM output somewhere. One can choose to put an external plug-in module in the module bay, or one can connect the module internally to the PPM output. This sounds harder than it actually is.
Once installed, one immediately has the advantages of telemetry. Every reciever, without any external sensors, transmits back it's supply voltage, and reception quality. Should there be transmission problems, the module's internal beeper will sound, to warn one before the link is lost. It will also beep, if the RX battery is low, before one crashes.
The Jeti Box, an info terminal, can be connected to every module. You can read the information in plain text here. Also, the recievers and sensors can be programmed with it. One can assign the different channels to different output ports, for example. One can set end points, mixers, trimmers, reverse, etc. One can set the warning voltage level of the RX battery to whatever voltage one wants. One can program the warning levels of the telemetry sensors, and assign different beep tones.
I like most the Sensors for electric flight: They are put between the flight pack and the ESC, and are connected to the telemetry port of the reciever. One can read actual voltage, current, and used capacity on the ground, and min/max values for it. One can program in a warning for voltage, current, and capacity: If one uses 1000mAh packs, one can set the warning level to 750mAh, and the beeper will sound, if this capacity is used up. This way, one has still juice left for restarts, and the pack is not depleted below 80%, ensuring long cycle life.
Once everything is programmend, one does not need the JetiBox any more. Just use the transmitter as usual, but now, the TX will beep before a problem occurs, or when the battery is low, etc. No need to rely on inaccurate flight timers any more, no guessing about the flight pack capacity left after a long flight.
Even the smallest 4-channel R4 reciever has full telemetry capacity. All recievers work down to a supply voltage of 2.8V, so there is no need for extra strong batterys, that some other systems need.
Already the small R4 or R5 recievers offer full range. I regularly fly them to the limits of my sight in a 2m glider. No need to buy dedicated "parkflyer-range" or "full-range" recievers. I fly my small recievers in indoor models during winter, and put them into my larger planes during summer.

Other options:
-The output framerate can be adjusted in a wide range, or it can be synchronized with the TX framerate for minimum latency.
-In case of signal loss, one can choose a failsafe position for each channel and a time, after that failsafe engages, or hold for all channels, or signal off for all channels.
-Multiple RXes can be operated at the same time, although the additional ones need to have their telemetry disabled, which can be programmed by the Jeti box. Idividual channels can be assigned to each reciever, like 2 pieces 4ch RXes. RX1: ch 1-4, RX2: ch 5-8
-Multiple sensors can be attached to one RX via the 4 channel expander.
-The larger RXes allow for up to 2 satellite RXes, thus giving 6 antennas in total.
-For the safety paranoid: Multiple modules can be operated from one transmitter, and the satellite RXes can be bound to different modules than the main RX. So one will still have control when one TX module fails.

Official description:

We present the innovative DUPLEX 2.4 GHz system by JETI Model for radio controlled models of all types working on the 2,4GHz band. Problems with interference and frequency control will be history, and operation on the 2,4GHz band will change your approach to radio control forever. In designing the DUPLEX system, our aim has always been to improve on what is offered by other radio control systems currently on the market. We offer you very sophisticated equipment offering reliable – duplex – secure – digital transmission of information.

Main advantages of the DUPLEX system:

no crystals used – no frequency checks required
you do not have to buy a new transmitter
easy and reliable binding of receivers to transmitters (you can use endless numbers of receivers with every transmitter)
high interference rejection provides safe operation - even in an interference rich environment
digital data transmision ensures distortion free transfer of information to the model
maximum safety
can be used with all types of models (aircraft, boats, cars)
two way communication between receiver and transmitter
telemetric data transfer to the model operator in real time
high sensitivity of receivers and high output of transmitters ensures visibility limit range
self-correcting coding of information
the DUPLEX system can handle up to 16 input channels with the use of two receivers
two aerial receivers ensure continuous control of models in any position, and eliminate blind spots caused by signal reflection
quality plotting of transmission channels and antenna position at start up, providing a low probability of transmission on busy or
interference rich channels
immediate response of the receiver output to changes in transmitter controls
transmitter modules are fitted with an alarm triggered by the receiver in dangerous situations (low receiver battery voltage, poor reception, etc.)
the DUPLEX system provides simultaneous operation of more than one receiver on the same transmitter (listening-in)
real time data display and easy programing using the JetiBox
failsafe with adjustable time delay.
receiver outputs can be changed to match any transmitter channel input
all of the receivers allow the setting of mixers, servo reverse, ATV, servo slow for each output on the receiver, even with the simplest of transmitters
How does the DUPLEX 2,4 GHz system work?

After switching on the transmitter and the receiver, the transmitter automatically acknowledges the receiver, and then both select free channels in the 2.4GHz band. The DUPLEX system then collects data on each channel selected for transmission integrity in relation to signal intensity, number of errors corrected, aerial position etc. If any channel is considered to be unfit for use, the channel is then changed to a new one by the DUPLEX system (and then channel hops as necessary). The DUPLEX system checks channel before starting transmit to minimise potential clashes with other transmitters (or with other systems used on the 2.4GHz band), which allows common operation of more transmitters simultaneously.

The DUPLEX Rx receiver

Line is assigned to operate with the transmitter modules DUPLEX Tx in the 2.4GHz band. The fully digital bidirectional communication between transmitter and receiver contributes to the development of new chances in the model remote control branche.

DUPLEX receivers are not only following up with the JBC receiver line by keeping up their univerzality and broad functional extent, but they additionally extend these functions due to the feasibility of the new DUPLEX system. One of the most important advantages is the operation without crystals – watching frequencies is a thing of the past, high interference resistance, far out of visibility range and continual control of model conditions in the air as well as many other functions are new and formerly unknown features.

DUPLEX Tx transmitter modules

Along with DUPLEX Rx receceivers constitute the base of a complex system working in the 2.4GHz band, assigned to remote control of models. These modules may be installed into transmitters which in a convenient way transmit stick and control element positions. Recently most of available transmitters working with PPM mode are suitable for this purpose.

DUPLEX Tx modules work up data of the transmitter control elements and send them to the corresponding (paired) receiver. Simultaneously they exchange service and telemetric informations with the receiver and take in turn advantage of them for operation optimization.

In order to take full advantage of the DUPLEX system it is advisable to connect the universal terminal JETIBOX to the transmitter module. This way you will be able to adjust easily requested parameters and to display data of transmitter, receiver as well as data of connected telemetric or diagnostic equipment. Another item of the TX-modules is indication of the complete system condition by means of sound signals.

Transfer of telemetric data in real time:

The JETIBOX terminal can be connected to the receiver or transmitter module to measure data. A valuable option is to connect the JETIBOX to the transmitter module and receive data wirelessly from the receiver and any sensors connected to it. Every DUPLEX receiver transmits the receiver battery voltage in real time. It is possible to set an audible warning which is activated by the voltage dropping below a pre-set limit. It is possible to connect a number of telemetric sensor to each receiver.

The Jeti Telemetric sensors can also be connected directly to the JETIBOX. For example, connecting the MUI sensor to the JETIBOX creates both a voltmeter and ampmeter.
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Last edited by Julez; Apr 27, 2011 at 02:36 PM. Reason: Information update