RADiOMASTER R88 Receiver User Manual

RADiOMASTER R88 Receiver

Product Information

The R88 Receiver is an 8-channel receiver with a frequency range of 2400-2483.5Mhz. It has a power input range of 4.5-8.4V and supports D8/D16v1/SFHSS signal formats. The output format is PWM and the RSSI range is more than 1km. The receiver supports return and has an antenna length of 15cm. It has a size of 402616mm and weighs 11g.

Product Usage Instructions

To use the R88 Receiver, follow these steps:

1. Connect the receiver to the power supply within the input voltage range of 4.5-8.4V.
2. Select the desired signal format (D8/D16v1/SFHSS) using the switch on the receiver.
3. Bind the receiver to the remote control using the bind method described in the user manual.
4. Once the receiver is bound, adjust the channel values on the remote control to the desired settings.
5. The receiver will save all current channel values as the fail-safe value when the BIND button is pressed once within 10 seconds of the receiver being powered on.
6. The BIND button function will be disabled 10 seconds after the receiver is powered on to prevent accidental changes to fail-safe settings while preparing for flight.
7. The RSSI output can be monitored using an OSD or SBUS98+RSSI1-89.

Receiver Specifications

• Channels: 8
• Frequency range: 2400-2483.5Mhz
• Power input range: 4.5-8.4V
• Signal format: D8/D16v1/SFHSS
• Output format: PWM
• Support return: support return RSSI
• Range: more than 1km
• Antenna length: 15cm
• Size: 402616mm
• Weight: 11g

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 will cycle between D8, D16 and S-FHSS protocols.
   • Three single flashes= D8 protocol.
   • Three double flashes= D16 protocol.
   • Three triple flashes= S-FHSS protocol.
3. When the flash pattern matches the transmitter protocol, press bind on the transmitter. The light will flash rapidly then return to solid.
4. Cycle the power to the receiver after binding.

Fail-safe Protection

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

RSSI output

This receiver has a total of 8 PWM channels + 9 SBUS Channels (Sbus has 8 control channels + 1 RSSI channel). Channels 1-8 are controlled by the remote controller, the 9th channel is the signal strength RSSI value output by the receiver, which can be read by various flight controllers and sent to the OSD to Show signal strength in the FPV video feed.

D8 and D16 compatible receivers MUST be frequency fine tuned before flight.

Once the radio is bound to the receiver:
Return to the RF Freq. fine tune option

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

Example
Connection is lost at -73 and +35; the median is -19: Once the Fine Tuning value is known, it can be used for all models which use the same protocol.
For More information visit https://www.multi-module.org/using-the-module /frequency-tuning.

References

• Frequency Tuning - MULTI-Module Documentation

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