1. Introduction
The Subraod Cell Phone Signal Booster (Model TB-1002) is designed to amplify 4G LTE and 5G cellular signals, improving voice and data performance within your home or office. This system supports Band 13 and Band 12/17, making it compatible with major US carriers such as Verizon, AT&T, and T-Mobile. The booster aims to reduce dropped calls, enhance call quality, and provide faster data speeds for various applications.
This manual provides detailed instructions for the proper installation, operation, and maintenance of your signal booster to ensure optimal performance.

Image 1.1: Complete Subraod Cell Phone Signal Booster kit components.

Image 1.2: Illustration of the signal booster's application range, showing improved signal coverage.
2. Safety Information
Please read and understand all safety instructions before installing and operating this device. Failure to do so may result in injury or damage to the equipment.
- Ensure all connections are secure before powering on the device.
- Do not operate the booster near water or in excessively humid environments.
- Use only the power adapter provided with the unit.
- Maintain a minimum separation distance of 32 feet (10 meters) between the outdoor and indoor antennas to prevent oscillation.
- This device must be operated ONLY in a fixed location for in-building use.
- FCC Warning: Before using this device, you MUST register this device with your wireless provider and have your provider's consent. You MUST discontinue operation immediately if requested by the FCC or a licensed wireless service provider.
3. Package Contents
Verify that all components are present in your package:
- Subraod Cell Phone Signal Booster Unit (Model TB-1002)
- Outdoor Directional Antenna (Yagi Antenna)
- Indoor Omni-directional Antenna
- Coaxial Cable (for outdoor antenna connection)
- Power Adapter
- Mounting Hardware (U-bolt, screws, wall anchors)

Image 3.1: All components included in the Subraod Cell Phone Signal Booster package.
4. Installation Guide
Follow these steps carefully to install your Subraod Cell Phone Signal Booster. Proper installation is crucial for optimal performance.
4.1. Pre-Installation Considerations
- Locate the Strongest Outdoor Signal: Use a cell phone in field test mode or an app like "Network Cell Info Lite" to find the nearest cell tower and the area with the strongest signal outside your building. This is where your outdoor antenna should be pointed.
- Antenna Separation: Ensure a minimum vertical or horizontal separation of 32 feet (10 meters) between the outdoor and indoor antennas. Greater separation is often better to prevent signal oscillation.
- Cable Routing: Plan the path for the coaxial cable from the outdoor antenna to the booster unit, and from the booster unit to the indoor antenna.
4.2. Step-by-Step Installation

Image 4.1: Visual guide for the installation process.
- Install the Outdoor Antenna:
Mount the outdoor directional antenna (Yagi antenna) on a pole or mast on the roof or highest point of your building. Point the antenna towards the nearest cell tower where the strongest signal was detected. Secure it firmly using the provided mounting hardware. Ensure the antenna is positioned to minimize obstructions.

Image 4.2: Example of an outdoor antenna mounted on a pole, directed towards a cell tower.
- Connect the Outdoor Antenna to the Booster:
Connect one end of the coaxial cable to the outdoor antenna. Route the cable into your building and connect the other end to the port labeled "OUTDOOR" or "BTS" on the signal booster unit.
- Install the Indoor Antenna:
Mount the indoor omni-directional antenna in the central area where you need improved signal coverage. This antenna should be placed at least 32 feet (10 meters) away from the outdoor antenna. Connect the indoor antenna to the port labeled "INDOOR" or "MOBILE" on the signal booster unit.
- Connect the Power Supply:
Once both antennas are connected and properly separated, connect the power adapter to the signal booster unit and then plug it into a standard electrical outlet. The "POWER" indicator light on the booster should illuminate.
Important: Do not power on the booster until both antennas are connected and properly separated to avoid damage to the unit.
5. Operating Instructions
After successful installation, the Subraod Cell Phone Signal Booster operates automatically.
- Power Indicator: The "POWER" LED light will be green when the unit is receiving power.
- Signal Indicator: The "SIGNAL" LED light indicates the operational status. A green light typically means the booster is working correctly and amplifying the signal. If it's red or flashing, refer to the Troubleshooting section.
- Automatic Gain Control: The booster features automatic gain control (AGC) to prevent interference with cellular networks and optimize signal amplification.
- Coverage Area: The booster can provide coverage up to 2000 sq ft, depending on the strength of the outdoor signal and building materials.

Image 5.1: The signal booster providing enhanced coverage in an indoor environment.
6. Maintenance
The Subraod Cell Phone Signal Booster requires minimal maintenance to ensure long-term performance.
- Regular Checks: Periodically inspect all cable connections to ensure they are secure and free from damage.
- Antenna Clearance: Ensure that both outdoor and indoor antennas remain unobstructed. Trim any new foliage that might block the outdoor antenna's line of sight to the cell tower.
- Cleaning: Clean the booster unit and antennas with a soft, dry cloth. Do not use liquid cleaners or solvents.
- Environmental Conditions: Ensure the booster unit is kept in a dry, well-ventilated area, away from extreme temperatures.
7. Troubleshooting
If you experience issues with your signal booster, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No signal improvement / "SIGNAL" LED is off or red. |
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| Dropped calls or slow data speeds. |
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| "POWER" LED is off. |
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8. Specifications
| Feature | Detail |
|---|---|
| Model | TB-1002 |
| Supported Bands | Band 13, Band 12/17 (700MHz) |
| Supported Technologies | 4G LTE, 5G (data and voice) |
| Coverage Area | Up to 2000 sq ft (actual coverage varies) |
| Compatible Carriers | Verizon, AT&T, T-Mobile (US Carriers) |
| Package Dimensions | 15.86 x 7.24 x 3.31 inches |
| Item Weight | 3.76 pounds |
| Special Features | High Gain Antennas, Automatic Gain Control (AGC) |
| FCC ID | 2A2G3TB-1002 |

Image 8.1: Rear view of the booster unit showing the FCC compliance label and model number.
9. Warranty and Support
Subraod is committed to providing quality products and customer satisfaction.
- Warranty: This product comes with a 30-day refund policy.
- Technical Support: For any questions, installation assistance, or troubleshooting not covered in this manual, please contact Subraod customer support through your order platform. Our professional technical team is available to assist you.
- FCC Compliance: This device complies with FCC regulations. Registration with your wireless provider is required before use.