1. Introduction
The FrSky Access 900MHz Long Range R9 MM-OTA Receiver is designed to provide extended range and enhanced performance for remote control applications. Utilizing the ACCESS protocol, this receiver offers convenient features such as wireless firmware updates (Over-The-Air) and telemetry data transmission. Its compact and lightweight design makes it suitable for various installations.
2. Safety Information
Always operate your remote control system responsibly. Failure to follow safety guidelines can result in property damage or injury. Ensure all connections are secure and correct before powering on. Keep the receiver away from moisture, extreme temperatures, and strong electromagnetic fields. Regularly inspect components for damage.
3. Product Overview
The R9 MM-OTA receiver is a miniature 900MHz long-range receiver. It features an Ipex connector for the antenna and multiple ports for connectivity.
Image 1: FrSky R9 MM-OTA Receiver with its detachable Ipex connector antenna.
Key Features:
- 915MHz (Non-LBT Version) / 868MHz (LBT Version) operation.
- Miniature size and super lightweight design.
- Supports Over-The-Air (OTA) firmware updates.
- Allows for firmware version checking.
- S.Port enabled for telemetry data transmission (F.Port support available via firmware update).
- Inverted S.Port enabled.
- Low latency and high precision.
- RSSI output available in SBUS.
- Battery voltage detection supported.
- Detachable Ipex connector antenna.
4. Specifications
| Specification | Value |
|---|---|
| Dimension | 16 x 10 x 2.8 mm (L×W×H) |
| Weight | 0.7g (without antenna) |
| Number of Channels | Non-LBT Version: 4/16CH (Telemetry) LBT Version: 4/16CH (Telemetry) / 4/16CH (No Telemetry) |
| Operating Voltage Range | DC 3.5V – 10V |
| Operating Current | 100mA@5V |
| Operating Range | Up to 10km or above |
| Compatibility | R9 series 900MHz module (ACCESS protocol) |
5. Setup
5.1. Antenna Installation
Carefully connect the detachable Ipex connector antenna to the receiver. Ensure the connection is firm to maintain optimal signal integrity and range.
5.2. Wiring Connections
Connect the receiver to your flight controller or other compatible devices using the appropriate ports. The R9 MM-OTA supports S.Port and inverted S.Port for telemetry. Refer to your flight controller's manual for specific wiring diagrams.
5.3. Binding Procedure
- Power on your transmitter and navigate to the binding menu for your R9M module.
- Select the appropriate mode (e.g., ACCESS, D16) and channel range.
- Press and hold the F/S (Fail-Safe) button on the R9 MM-OTA receiver while powering it on. The red LED on the receiver will flash, indicating it is in binding mode.
- On your transmitter, initiate the binding process. The receiver's LED will turn solid green when binding is successful.
- Power cycle both the transmitter and receiver to confirm the binding.
Note: Ensure your R9M module and R9 MM-OTA receiver are running compatible firmware versions for successful binding. Firmware updates can be performed wirelessly via OTA.
6. Operating
6.1. Telemetry Data Transmission
The R9 MM-OTA receiver supports telemetry data transmission via S.Port. This allows you to monitor various parameters such as receiver signal strength (RSSI) and battery voltage directly on your compatible FrSky transmitter. For F.Port functionality, a specific firmware update is required.
6.2. Over-The-Air (OTA) Firmware Updates
The OTA feature allows for wireless firmware updates of the receiver directly from your compatible FrSky transmitter. This eliminates the need for physical connection to a computer for updates. Consult your transmitter's manual for detailed instructions on performing OTA updates.
6.3. Firmware Version Check
You can check the current firmware version of your R9 MM-OTA receiver wirelessly through your compatible FrSky transmitter. This helps ensure all components are running the latest and compatible software.
7. Maintenance
The R9 MM-OTA receiver is a robust electronic component. To ensure its longevity and optimal performance:
- Keep the receiver clean and free from dust and debris.
- Avoid exposing it to excessive vibrations or physical shock.
- Ensure proper ventilation if installed in an enclosed space to prevent overheating.
- Regularly check antenna connections for tightness and damage.
8. Troubleshooting
8.1. Receiver Not Binding
- Check Firmware Compatibility: Ensure both your transmitter's R9M module and the R9 MM-OTA receiver are running compatible firmware versions (e.g., both ACCESS or both ACCST). Firmware updates are often necessary for new products or after major updates.
- Binding Button Functionality: Verify the F/S button on the receiver is functioning correctly. If it's damaged or unresponsive, binding may fail.
- Power Cycle: Always power cycle both the transmitter and receiver after attempting to bind.
- Proximity: During binding, keep the receiver close to the transmitter (within 1 meter).
8.2. Poor Range or Signal Loss
- Antenna Placement: Ensure the receiver antenna is positioned optimally, away from carbon fiber, metal, or other signal-blocking materials. Avoid sharp bends in the antenna wire.
- Antenna Damage: Inspect the antenna for any cuts, kinks, or damage to the active element. Replace if necessary.
- Interference: Keep the receiver away from other electronic components that may generate electromagnetic interference (e.g., ESCs, motors, video transmitters).
- Power Supply: Verify the receiver is receiving stable power within its specified voltage range.
9. Warranty and Support
FrSky products are covered by a limited warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the official FrSky website or contact your local distributor. For technical support, visit the FrSky support portal or contact their customer service.
