FrSky R9 MM-OTA 900MHz Mini Receiver
SKU: DRFC-3305
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FrSky R9 MM-OTA 900MHz Mini Receiver

₹3,519.00 (Inclusive of all taxes)
Out of Stock

The FrSky R9 MM-OTA is a 900MHz mini receiver designed for long-range FPV and RC applications, offering low-latency control and telemetry data transmission with an inverted S.Port output for enhanced device compatibility.

Features

  • 900MHz (915/868MHz) long-range operation with up to 10km+ range.
  • Extremely compact and lightweight design at 16x10x2.8mm and 0.7g.
  • Features inverted S.Port output for broad compatibility with flight controllers.
  • Supports SBUS, F.Port (with firmware), telemetry, and RSSI output.
  • Compatible with FrSky R9M and R9M Lite transmitter modules.

Out of stock

Description

The FrSky R9 MM-OTA receiver continues the legacy of the R9 series, packing long-range 900MHz performance into a miniaturized form factor. Its design prioritizes low latency and high-precision signal decoding, essential for responsive FPV flight and reliable control at extended distances.

Engineered for flexible integration, it includes an inverted S.Port output, broadening compatibility with a wider array of flight controllers and devices without requiring external signal inverters. The receiver supports comprehensive telemetry data transmission back to the transmitter, including battery voltage sensing, and features a detachable IPEX connector antenna for customizable antenna setups.

Key Features

  • Dual-Band Frequency: Operates on 915MHz (Non-EU) or 868MHz (EU) for compliant long-range operation.
  • Miniaturized Form Factor: Ultra-compact 16x10x2.8mm PCB with a weight of just 0.7g, ideal for tight builds.
  • Advanced Protocol Support: Native SBUS and S.Port with inverted S.Port output; supports F.Port protocol via firmware update.
  • Comprehensive Telemetry: Enables real-time transmission of RSSI, battery voltage, and other flight data.
  • Wide Voltage Input: Accepts 3.5V to 10V DC, compatible with both 5V BEC and direct 2S LiPo inputs.
  • Detachable Antenna: Features an IPEX connector for easy replacement or upgrade to directional antennas.
  • Multi-Channel Operation: Configurable for 4/8/16 channels with or without telemetry, depending on region and firmware.

Applications

  • Long-range FPV freestyle and exploration drones requiring reliable control links beyond 1km.
  • Mini and micro long-range builds where space and weight are at a premium.
  • Fixed-wing UAVs and planes utilizing the FrSky R9M system for extended flight missions.
  • DIY robotics and ground vehicle projects needing robust telemetry and control.
  • Backup or secondary control link systems in redundancy-focused professional UAVs.

Technical Specifications

Item TypeReceiver
Operating Voltage3.5V to 10V DC
Operating Current100mA @ 5V
Operating RangeUp to 10km or above
Frequency915MHz (Non-EU) / 868MHz (EU)
CompatibilityFrSky R9M, R9M Lite
Dimensions (LxWxH)16 x 10 x 2.8 mm
Weight (without antenna)0.7g
Channels (Non-EU)4/16CH (Telemetry)
Channels (EU)4/8CH (Telemetry) / 4/16CH (Telemetry) / 4/16CH (No Telemetry)
ProtocolsSBUS, S.Port, F.Port (with firmware)
Antenna ConnectorIPEX
OutputsInverted S.Port, RSSI (via SBUS)

Frequently Asked Questions

What is the main advantage of the inverted S.Port output on the R9 MM-OTA?

The inverted S.Port output eliminates the need for an external signal inverter when connecting to flight controllers that require an inverted signal for telemetry. This simplifies wiring and broadens compatibility with a wider range of Betaflight and ArduPilot-based flight controllers directly.

Can I use the FrSky R9 MM-OTA with a 3S LiPo battery?

Yes, the receiver's wide operating voltage range of 3.5V to 10V DC makes it directly compatible with a regulated 5V BEC from a 3S or higher LiPo. It can also accept direct 2S LiPo input (7.4V nominal) without an external regulator, but connecting a 3S (11.1V) directly would exceed its maximum voltage rating.

How do I enable F.Port protocol on this receiver?

F.Port is not enabled by default. You must download and flash the specific F.Port firmware for the R9 MM-OTA from the official FrSky website using an FrSky STK tool or compatible programmer. After flashing, you can configure a single wire for both control and telemetry, reducing wiring complexity.

What is the difference between the EU and Non-EU versions?

The primary difference is the operating frequency and channel/telemetry restrictions to comply with regional regulations. The Non-EU version uses 915MHz and offers 16 channels with telemetry. The EU version uses 868MHz and has configurable modes: 8 channels with telemetry, 16 channels with telemetry, or 16 channels without telemetry, as per EU LBT (Listen Before Talk) rules.

Package Includes

  • 1 x FrSky R9 MM-OTA Receiver

Additional Information

Weight 0.0007 kg
Dimensions 1.6 × 1 × 0.28 cm

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