Flysky NB4+/NB4 Pro+ DragRacing FRM303 High Power Module Mount Installation Guide

Last Updated: June 2026 | Reading Time: 15 minutes | Difficulty: Intermediate | Author: Dannyi Chen

Dannyi Chen — RC Enthusiast & Technical Writer at SoarSky. Specializes in Flysky transmitter systems, AFHDS3 protocol, and high-power RF modules for competitive RC racing.

Table of Contents

• I. Product Highlights
• II. Installation Steps
  • 1. Parts List
  • 2. Installing the Front Bracket Mount
  • 3. Installing the Pro+ Battery Base Frame
  • 4. Installing the FRM303 High Power Module
  • 5. Connecting the Signal Cable
  • 6. Signal Conversion Board Battery Installation
  • 7. FRM303 Power Cable Connection
  • 8. Signal Conversion Board Bracket
  • 9. Signal Conversion Board Fixing Rod
  • 10. Type-C Cable Connection
• III. FRM303 and NB4 Pro+ Connection Setup
• IV. FAQ
• V. Purchase Link
• VI. Further Reading

I. What Makes the FRM303 Module Mount Worth It?

Key Features:

1. Extended Range for Racing: The FRM303 High Power Module supports up to 2W transmission power, completely eliminating control distance issues. Ground control distance exceeds 1km.
2. Adjustable Angle Adapter: The high-frequency module mount features an adjustable angle adapter, accommodating various mounting angles for optimal signal transmission.
3. Built-in Battery Support: The module mount circuit board supports 18650 rechargeable batteries and includes a low battery indicator for convenient monitoring.
4. Metal Frame Compatible: Fully compatible with metal base protective frames for enhanced durability and protection.
5. Multi-Interface Support: Supports Type-C, audio, and USB-A interfaces for versatile connectivity options.
6. Broad Compatibility: Supports FS-G11P, NB4 Pro+, and NB4+ transmitters.
7. Base Battery Support: The base protective frame supports NB4 Pro+ or NB4+ base batteries for integrated power management.

How Does It Work?

The system works by configuring the Type-C data interface of the NB4+/NB4 Pro+ to output a PPM signal (using the NB4+/NB4 Pro+ coaching function). The FRM303 High Power Module is then configured to recognize and process this PPM signal for extended-range control.

II. How to Install the FRM303 Module Mount Step by Step

1. Parts List

The image below shows the complete parts list for the NB4 Pro+ Base configuration:

• Cooling fan x 1
• Fan mounting screws x 4
• NB4 Pro+ Base side protective frames x 2
• NB4 Pro+ Base front protective frame x 1
• NB4 Pro+ Base rear protective frame x 1
• NB4 Pro+ protective frame screws x 4 (Hex 2.0mm)
• NB4 Pro+ Base front protective frame mount x 1
• NB4 Pro+ Base front protective frame mount screws x 4 (Hex 1.5mm)
• Signal conversion board bracket x 1
• Signal conversion board bracket screws x 4 (Hex 2.0mm)
• Signal conversion board fixing rod x 1
• 18650 battery x 2
• Signal conversion board x 1
• FRM303 signal cable x 1
• FRM303 mounting screws x 2 (Hex 1.0mm)
• Type-C cable x 1

2. Installing the Front Bracket Mount

The front bracket mount requires 4 screws (Hex 1.5mm) for installation.

3. Installing the Pro+ Battery Base Frame

The base frame requires 4 Hex 2.0mm screws for secure attachment.

4. Installing the FRM303 High Power Module

Installing the FRM303 High Power Module requires 2 Hex 1.0mm screws.

The image below shows the hole alignment between the FRM303 High Power Module and the signal conversion board:

The 2 Hex 1.0mm screw mounting hole positions:

5. Connecting the Signal Cable

The FRM303 High Power Module and the signal conversion board are connected via a terminal signal cable.

Installation position as shown above:

Installation result as shown above:

6. Signal Conversion Board Battery Installation

The signal conversion board is powered by 2 x 18650 batteries and can also charge 18650 batteries.

After installation, switch the power to the ON position. The red indicator light will illuminate.

7. FRM303 Power Cable Connection

The signal conversion board provides power to the FRM303 High Power Module.

8. Signal Conversion Board Bracket

The signal conversion board bracket requires 4 Hex 2.0mm screws for secure mounting.

9. Signal Conversion Board Fixing Rod Installation

The fixing rod includes a metal washer. The washer must be used; otherwise, the assembly will not be secure.

10. Type-C Cable Connection

III. How to Configure the FRM303 Module with NB4 Pro+?

For a full video walkthrough, see the tutorial below:

Here are the step-by-step configuration instructions:

(1) Configure FRM303 to Recognize PPM Signals

• Push upwards the Up key for ≥ 3S and < 9S while powering on the RF module to enter the input signal setting state. The LED will turn solid blue.
• Push the Up or Down key to switch the input signal type. LED flashing patterns vary by signal type.
• Press the Center key for 3S to save the settings. Push the Left key to exit. Blue LED: one-flash-one-off = PPM signal recognized.

(2) Set the NB4+/NB4 Pro+ to Output PPM Signal via Coaching Function

• Power on your NB4+/NB4 Pro+ transmitter.
• Enter the System Settings menu (long press the power button or navigate via the main menu).
• Go to Trainer / Coaching settings.
• Set the coaching output mode to PPM.
• Set the output interface to Type-C.
• Save and exit. The Type-C port will now output a PPM signal when the transmitter is powered on.

(3) Power On and Verify

• Turn on the power of the battery dock. The Type-C port of the dock will output the PPM signal to the FRM303 module.
• Switch the FRM303 module power to ON. Verify the LED status indicates correct signal reception.
• Perform a range test before use to confirm the extended control distance is functioning correctly.

IV. Frequently Asked Questions

Q: Which transmitters are compatible with this FRM303 module mount?

A: The mount is compatible with Flysky NB4+, NB4 Pro+, and FS-G11P transmitters.

Q: How long do the 18650 batteries last?

A: With 2 x 18650 batteries (typically 3000–3500mAh each), you can expect approximately 3–5 hours of continuous use depending on transmission power settings and ambient temperature.

Q: Can I charge the 18650 batteries while they are installed?

A: Yes. The signal conversion board supports in-situ charging of the 18650 batteries via the board's charging interface.

Q: Does the FRM303 module work with AFHDS3 receivers?

A: The FRM303 operates as a PPM-based power amplifier and is not protocol-specific. It amplifies the signal output from your transmitter. Receiver compatibility depends on your transmitter's protocol settings (AFHDS3 recommended for NB4 Pro+).

Q: Is this legal to use in my region?

A: RF transmission power regulations vary by country. Please check your local regulations regarding 2.4GHz transmission power limits before use. This product is intended for RC hobby use on private property or designated racing venues.

Q: What tools do I need for installation?

A: You will need Hex (Allen) keys in 1.0mm, 1.5mm, and 2.0mm sizes. All screws are included in the package.

V. Where to Buy

The Flysky NB4+/NB4 Pro+ DragRacing FRM303 High Power Module Mount is available exclusively at SoarSky:

→ Buy FRM303 Module Mount on SoarSky

About SoarSky — A team of RC model and drone enthusiasts dedicated to providing premium transmitter accessories, FPV components, and RC hobby gear. We test every product hands-on and share honest, technical content to help the RC community make better decisions. Learn more at soarskyrc.com/pages/soarsky-about-us.

Copyright: This article is original content by SoarSky. Unauthorized reproduction is prohibited. | Disclosure: This is an independent review. No sponsorship was received. All opinions are based on hands-on experience and objective spec analysis. | Last Updated: June 2026