RadioMaster R84 Receiver User Manual

Overview

The RadioMaster R84 is a compact 2.4 GHz radio control receiver designed for remote-controlled models. It supports multiple protocols including D8, D16v1, and SFHSS, offering flexibility for various transmitter systems.

Receiver Description: The R84 receiver is a small circuit board, measuring approximately 30mm x 15mm x 5mm and weighing 3 grams. It features two antennas, each connected via a UFL connector, to ensure reliable signal reception. The top side of the receiver includes a BIND button and an LED indicator. The bottom side provides pinouts for power input (4.5-8.4V) and four PWM output channels (CH1-CH4).

Specifications

Bind Method

1. Turn on your transmitter and select the desired protocol.
2. Enter bind mode on the receiver: Press and hold the [BIND] button while powering on the receiver. The receiver's LED will cycle through the supported protocols (D8, D16, S-FHSS).
3. When the receiver's LED pattern matches the transmitter's protocol, press the BIND button on the transmitter. The receiver's LED will flash rapidly and then return to a solid state, indicating successful binding.
4. After binding, cycle the power to the receiver to complete the process.

Note: This receiver does not support FrSky transmitters; it is only compatible with MPM (Multi-Protocol Module) radios.

Fail-Safe Protection

To set the fail-safe value: Press the [BIND] button once within 10 seconds of powering on the receiver. The receiver will save all current channel values from the transmitter as the fail-safe setting. After 10 seconds, the [BIND] button function will be disabled to prevent accidental changes while preparing the model for flight.

Important Note: For receivers compatible with D8 and D16 protocols, frequency fine-tuning is mandatory before flight to eliminate frequency errors between the transmitter and receiver, ensuring optimal control distance and stability.

Frequency Fine Tuning (for D8/D16 Protocols)

Once the radio is successfully bound to the receiver, access the 'RF Freq. fine tune' option within your transmitter's Model Setup menu.

1. Gradually decrease the 'RF Freq. fine tune' value until the radio loses connection with the receiver. Record this minimum value (TUNE_MIN).
2. Gradually increase the 'RF Freq. fine tune' value until the connection is restored. Continue increasing until the radio loses connection again. Record this maximum value (TUNE_MAX).
3. Calculate the median value using the formula: (TUNE_MIN + TUNE_MAX) / 2 = TUNE_MEDIAN.
4. Set the 'RF Freq. fine tune' parameter to the calculated median value. For example, if connection is lost at -73 and re-established before being lost again at +35, the median value is -19.

Once the correct Fine Tuning value is determined, it can be applied to all models using the same protocol.

Model Setup Example

The Model Setup screen in a compatible transmitter typically includes options for configuring external RF modules. Key settings visible might include:

• External RF: Specifies the use of an external module.
• Mode: Selection for the module type (e.g., MULTI).
• Module Status: Displays the module's firmware version and status (e.g., V1.3.3.7 AETR).
• RF Protocol: The selected protocol for the receiver (e.g., D8).
• RF Freq. fine tune: The parameter adjusted during frequency tuning.
• Bind on channel: Configuration for binding channel.
• Low power mode: Option to enable or disable low power mode.