RadioMaster R86C Receiver User Manual

This document provides instructions and specifications for the RadioMaster R86C 2.4GHz receiver.

Receiver Diagram Description: The diagram shows the top and side views of the RadioMaster R86C 2.4GHz receiver. The top view displays the BIND LED, KEY button, LED indicator, and ports labeled S.BUS, CH6, CH5, CH4, CH3, CH2, CH1. The receiver measures 45mm x 21.2mm x 12.7mm and weighs 8 grams. It includes two antennas. The side view shows the antenna connection and a [positive terminal].

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.
3. The receiver will cycle between protocols: D8, D16, S-FHSS.
4. When the flash pattern matches the transmitter protocol, press BIND on the transmitter. The light will flash rapidly then return to solid.
5. After binding, cycle the power to the receiver.

Note: This receiver does not support FrSky transmitters; it is only compatible with MPM radios.

RSSI Output

This receiver provides a total of 6 PWM channels and 9 SBUS channels. SBUS includes 8 control channels and 1 RSSI channel. Channels 1-8 are controlled by the remote controller. The 9th channel outputs the signal strength RSSI value, which can be read by flight controllers and sent to the On-Screen Display (OSD) for display in the FPV video feed.

Fail-Safe Protection

1. Press the [BIND] button once within 10 seconds of the receiver being powered ON. The receiver will save all current channel values from the remote control as the fail-safe value.
2. 10 seconds after the receiver is powered ON, the [BIND] button function is disabled to prevent accidental changes to fail-safe settings while preparing the model for flight.

Note: D8 and D16 compatible receivers MUST be frequency fine-tuned prior to flight.

Frequency Fine Tuning Procedure:

Once the radio is bound to the receiver, navigate to the RF Freq. fine tune option in Model Setup.

1. Lower the value until the radio loses connection with the receiver. Record this value as [TUNE_MIN].
2. Raise the value until the connection is restored, then continue to raise it until the radio loses connection again. Record this value as [TUNE_MAX].
3. Calculate the median between the two values using the formula: ([TUNE_MIN] + [TUNE_MAX]) / 2 = [TUNE_MEDIAN].
4. Set the RF Freq. fine tune to the calculated median value.

Example: If connection is lost at -73 and +35, the median is calculated as: (-73 + 35) / 2 = -38 / 2 = -19. Set RF Freq. fine tune to -19.

Note: Once the Fine Tuning value is known, it can be used for all models that use the same protocol.

Model Setup Example:

The following fields are typically found in the Model Setup menu:

• Mode: MULTI
• Module Status: V1.3.3.7 AETR
• RF Protocol: D8
• RF Freq. fine tune: 0 RSSI 0 db (This value will be adjusted based on the tuning procedure)
• Bind on channel: (Not specified in detail)
• Low power mode: (Not specified in detail)

Further Information

For more information, visit: https://www.multi-module.org/using-the-module/frequency-tuning