Comfast WIFI5 USB Wifi Adapter User Manual

1. Introduction

This manual provides detailed instructions for the Comfast WIFI5 USB Wifi Adapters, including models CF-938AC, CF-927BF, and CF-811AC. These adapters are designed to provide high-speed, reliable wireless connectivity for your desktop or laptop computers. Featuring dual-band support (2.4GHz and 5GHz), they offer enhanced performance for various online activities, from gaming and streaming to general office work.

Please read this manual carefully before using your Comfast USB Wifi Adapter to ensure proper installation and optimal performance.

2. Product Models Overview

The Comfast WIFI5 USB Wifi Adapter series includes several models, each tailored for specific performance needs:

2.1. CF-938AC (1900Mbps Dual Band Wifi Adapter)

This model offers a high transmission rate of 1900Mbps, ideal for demanding applications like online gaming and 4K streaming. It features a powerful RTL8814AU chipset, 4*FEM (PA+LNA+SW) for enhanced signal, and external 2*3dBi antennas that can rotate 180 degrees for optimal reception. It connects via USB 3.0.

Image: Comfast CF-938AC 1900Mbps Dual Band WiFi Adapter with key features listed.

2.2. CF-927BF (1300Mbps Dual Band BT + WiFi 2 in 1 Adapter)

The CF-927BF combines 1300Mbps dual-band Wi-Fi with Bluetooth 4.2 connectivity. It uses an RTL8822BU chipset and features external 2*3dBi antennas. This model is perfect for users needing both high-speed Wi-Fi and Bluetooth capabilities.

Image: Comfast CF-927BF 1300Mbps Dual Band BT + WiFi 2 in 1 Adapter.

2.3. CF-811AC (650Mbps Mini USB Wifi Adapter)

A compact and portable solution, the CF-811AC offers 650Mbps dual-band Wi-Fi. It features a built-in 2dBi antenna and uses an RTL8811CU chip, connecting via USB 2.0. Its mini size makes it highly compatible and discreet.

Image: Comfast CF-811AC 650Mbps Mini USB Wifi Adapter.

3. Setup Guide

3.1. Package Contents

Before installation, please verify that your package contains the following items:

• 1x Comfast Wireless Adapter (CF-938AC, CF-927BF, or CF-811AC model)
• 1x Quick Installation Guide
• 1x CD Driver

Image: Packing list for CF-938AC, including adapter, manual, and CD driver.

Image: Packing list for CF-927BF, including adapter, manual, and CD driver.

Image: Packing list for CF-811AC, including adapter, manual, and CD driver.

3.2. Driver Installation

1. Insert the CD Driver: Place the included CD driver into your computer's CD-ROM drive. If your computer does not have a CD-ROM drive, you can download the latest drivers from the official Comfast website.
2. Run the Installer: Navigate to the CD drive and run the setup executable (e.g., `setup.exe`). Follow the on-screen prompts to complete the driver installation.
3. Operating System Compatibility:
   • Windows: All models support Windows 7/8/8.1/10/11 (32-bit and 64-bit).
   • Mac & Linux: For Mac and Linux operating systems, you will need to download the specific drivers from the Comfast website. The Bluetooth driver for CF-927BF does not support Windows XP/Vista/Mac.

3.3. Physical Connection

1. Select a USB Port: For optimal performance, plug the adapter into a USB 3.0 port (blue interior) if available. CF-938AC and CF-927BF models are designed for USB 3.0, while CF-811AC uses USB 2.0. The adapters are backward compatible with USB 2.0 ports.
2. Insert the Adapter: Carefully insert the USB Wifi Adapter into an available USB port on your desktop or laptop.
3. Antenna Adjustment (CF-938AC & CF-927BF): For models with external antennas, you can rotate the antennas up to 180 degrees to optimize signal reception. Position them for the best possible signal strength.

Image: USB 3.0 Interface with fast and stable transmission for CF-938AC.

Image: Multi-compatible operation system support for CF-938AC, including Windows 7/8/8.1/10.

4. Operation

4.1. Connecting to a Wi-Fi Network

1. After successful driver installation and physical connection, your computer should detect the new wireless adapter.
2. Click on the Wi-Fi icon in your system tray (usually in the bottom-right corner for Windows).
3. A list of available Wi-Fi networks will appear. Select your desired network.
4. Enter the network password (if required) and click 'Connect'.
5. Once connected, the adapter's indicator light (if present) will typically show a steady blue light.

4.2. Using the Adapter as a Wi-Fi Transmitter (AP Function - CF-938AC)

The CF-938AC model supports a 'Simulation AP' function, allowing it to act as a Wi-Fi hotspot to share your internet connection with other devices.

1. Ensure your computer is connected to the internet via an Ethernet cable or another Wi-Fi source.
2. Open the utility software installed with the driver.
3. Look for an option like 'AP Mode', 'SoftAP', or 'Hotspot'.
4. Configure the network name (SSID) and password for your new Wi-Fi hotspot.
5. Enable the AP function. Your other devices can now connect to this new Wi-Fi network.

Image: Illustration of CF-938AC functioning as a WiFi transmitter for desktop use.

4.3. Dual Band Usage (2.4GHz vs 5GHz)

Your Comfast adapter supports both 2.4GHz and 5GHz frequency bands. You can choose the band that best suits your needs:

• 2.4GHz: Offers longer range and better penetration through walls, suitable for general browsing and when your device is far from the router.
• 5GHz: Provides higher speeds and less interference, ideal for gaming, HD video streaming, and other bandwidth-intensive tasks when closer to the router.

Image: Visual explanation of 2.4GHz (long distance, wide range) and 5.8GHz (high speed, less interference) bands.

5. Specifications

5.1. CF-938AC Specifications

Image: Detailed specification table for Comfast CF-938AC.

5.2. CF-927BF Specifications

5.3. CF-811AC Specifications

6. Troubleshooting

6.1. No Wi-Fi Connection / Adapter Not Detected

• Check Driver Installation: Ensure the correct drivers are installed for your operating system and adapter model. Reinstall drivers if necessary.
• Verify USB Port: Try plugging the adapter into a different USB port. Ensure it's a functioning port and, for CF-938AC/CF-927BF, preferably a USB 3.0 port.
• Restart Computer: A simple restart can often resolve detection issues.

6.2. Weak Signal / Slow Speed

• Adjust Antennas (CF-938AC & CF-927BF): Rotate the external antennas to different positions to find the optimal signal strength.
• Relocate Adapter: Move the computer or adapter to an area with fewer obstructions (walls, large metal objects) between it and the Wi-Fi router.
• Switch Frequency Band: If you are experiencing interference on the 2.4GHz band, try connecting to the 5GHz band (if your router supports it and you are within range). If you are far from the router, 2.4GHz might offer better range.
• Check Router Settings: Ensure your router is broadcasting a strong signal and is configured correctly for dual-band operation.

6.3. Connection Drops Frequently

• Driver Update: Ensure you have the latest drivers installed from the Comfast website.
• Power Management: In Windows Device Manager, find your wireless adapter, go to 'Properties' -> 'Power Management', and uncheck 'Allow the computer to turn off this device to save power'.
• Interference: Other electronic devices (microwaves, cordless phones) can cause interference. Try to minimize their proximity to the adapter.

Image: CF-938AC demonstrating stable performance during gaming, indicating no dropping or sticking.

7. User Tips

Based on general best practices for USB Wifi adapters, consider the following tips for an improved experience:

• Use USB 3.0 Ports: Always prioritize using a USB 3.0 port for CF-938AC and CF-927BF models to achieve their maximum advertised speeds.
• Optimal Placement: Avoid placing the adapter behind your computer tower or in enclosed spaces. An open, elevated position often yields better signal.
• Keep Drivers Updated: Regularly check the Comfast official website for the latest driver updates to ensure compatibility and performance improvements.
• Minimize Obstructions: Reduce physical barriers like walls, furniture, and other electronics between your adapter and the Wi-Fi router.
• Consider a USB Extension Cable: If your computer's USB ports are in an obstructed location, a short USB 3.0 extension cable can help position the adapter for better signal reception.

8. Maintenance

• Keep Clean: Periodically clean the adapter's exterior with a soft, dry cloth. Avoid using liquid cleaners or solvents.
• Protect USB Connector: When not in use, keep the USB connector covered or protected to prevent dust and damage.
• Avoid Extreme Conditions: Do not expose the adapter to extreme temperatures, humidity, or direct sunlight.

9. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the warranty card included with your product or visit the official Comfast website. You can also contact Comfast customer service directly for any product-related inquiries.