Duplex Receiver Types
Duplex receivers are divided into several groups:
- Duplex Rx – for general-purpose use
- Duplex REX – with configurable E1 and E2 output ports
- Duplex REX Assist – with integrated stabilization
- Duplex Rsat 2 – satellite receiver for the 2.4 GHz band
- Duplex Rsat 900 and Rsat900NG – satellite receivers for the 900 MHz band
Receivers can be used either standalone or in combination with other receivers. Using multiple receivers together, especially in dual-band 2.4 GHz/900 MHz operation, significantly increases transmission reliability and safety.
General Guidelines
- Always ensure that your receivers, transmitter, and other Duplex components are running the latest firmware
- If you are unsure or updates are missing, update the devices using the JETI Studio program (free to download at www.jetimodel.cz)
- There are multiple ways to achieve the correct setup; the procedure described here is just one of them
Basic Receiver Pairing Procedure
- Insert the bind plug into the Ext. port of the receiver
- Power on the receiver (connect a power supply to the receiver)
- Power on the transmitter and confirm the pairing process
Connecting a REX Receiver with an Rsat2 Satellite Receiver (2.4 GHz)
Duplex DC/DS transmitters are equipped with two RF modules for the 2.4 GHz band. Using a redundant receiver setup increases transmission reliability.
Procedure:
- Turn on the transmitter and in Menu > Advanced Properties > Wireless Modes/Trainer, select Mode – Double Path
- Insert a bind plug into the Ext. port of the main receiver (REX) and connect power to the receiver. Then confirm Bind Main RF Module in the transmitter menu
- Remove the bind plug from the main receiver and insert it into the Ext. port of the satellite receiver (Rsat2)
- Connect the PPM output of the Rsat2 to the E1 or E2 input of the main REX receiver
- In the transmitter menu, start the Pair Secondary Module function and confirm the binding
- Remove the bind plug from the Rsat2 and connect the PPM signal cable to the Ext. port (make sure the polarity is correct!)
- In the receiver menu (Menu > Model > Device Explorer > REX > Alternate Pin Configuration), set the port (E1 or E2) connected to the satellite to EX Bus Input/Backup
Then in the Rsat2 menu (Menu > Model > Device Explorer > RSAT EX > Serial Link), set EX Bus & PPM Positive
Functionality Check:
In Menu > Advanced Properties > Wireless Modes/Trainer, press the F1 button (antenna symbol) to select Block Main RF Module, then Block Secondary RF Module.
In both cases, the model must remain controllable.
Connecting a REX Receiver with an Rsat 900 (NG) Satellite Receiver
For enhanced control security, you can enable dual-band communication by combining a 2.4 GHz receiver (REX) with a 900 MHz satellite (Rsat 900 or Rsat 900 NG).
Note:
- For DC/DS-24 transmitters, use Rsat 900
- For all other Duplex DC/DS transmitters, use Rsat 900 NG (Next Generation)
Procedure:
- Make sure that in the transmitter menu Menu > Advanced Properties > Wireless Modes/Trainer, the Default Mode is selected
- Bind the REX receiver with the transmitter
- Insert a bind plug into the Ext. port of the Rsat 900 (NG) satellite
- Connect one of the Rsat outputs to the E1 or E2 input of the REX receiver
- In the transmitter menu (see step 1), select Enable 900MHz Backup and start Pair 900MHz Module
- Remove the bind plug from the Rsat 900 (NG)
- In the receiver menu (Menu > Model > Device Explorer > REXxx > Alternate Pin Configuration), set the input (E1 or E2) connected to the satellite to EX Bus Input/Backup
In the satellite menu (Menu > Model > Device Explorer > RSAT 900 > Alternate Pin Configuration), set the used output to EX Bus
Functionality Check:
In Menu > Advanced Properties > Wireless Modes/Trainer, use the first button under the screen (antenna symbol) to select:
- Disable Main RF Module
- Then Disable All Except 900MHz Backup
In both cases, the model must remain controllable.
Warning:
If 900 MHz operation is enabled for a given model but the 900 MHz receiver is not functioning for any reason, the system’s safety check will prevent model activation.
Connecting a Duplex Rx Receiver with Rsat2 (2.4 GHz) and Rsat 900 Satellites
This configuration fully utilizes the capabilities of the Duplex system: dual 2.4 GHz transmission and an additional 900 MHz backup link. Older Rx receiver models (e.g., Duplex R14 or R18) require different input/output settings for satellite connections.
- Set the SAT1 and SAT2 inputs on the Rx receiver to PPM input
- On the Rsat2 and Rsat 900 satellite outputs, set Serial Link to PPM Positive
- Set the PPM channel count according to the number of channels used by the main Rx receiver
The setup procedure is otherwise identical to that for REX receivers.
In the transmitter menu Menu > Advanced Properties > Wireless Modes/Trainer, enable:
- Mode – Double Path
- Enable 900MHz Backup (see step 2 in the previous guide)
Examples of Connecting REX Receivers with Central Box
Central Boxes integrate several components into one unit—such as a power distribution board, electronic switch, multiple power input combiner, telemetry sensors, etc.—making them ideal for use in larger models when paired with multiple receivers.
Central Box + REX9 Slim Assist + Rsat 900 (NG)
Instead of a typical 2.4 GHz satellite, a REX9 Slim Assist receiver is used, allowing the use of stabilization features. These functions remain active even if the 2.4 GHz link fails and the system switches to the 900 MHz backup.
Important:
- Disable all Fail-Safe features (including "Intelligent") in both receivers
- Enable Fail-Safe only in the Central Box
Central Box + REX9 Slim Assist + REX + Rsat 900 (NG)
This setup uses two 2.4 GHz receivers to fully utilize the Double Path mode supported by Duplex transmitters. In the transmitter go to:
Menu > Advanced Properties > Wireless Modes/Trainer and select Double Path.
Important:
- Disable Fail-Safe in all receivers (including "Intelligent")
- Enable Fail-Safe in the Central Box
Warning:
Do not connect servos or other devices directly to receivers that are plugged into the Central Box inputs. These inputs are current-limited and intended only for receiver/satellite connections—connecting servos may result in permanent damage