1. Introduction
Thank you for choosing the HTOOL HT004 Signal Amplifier. This low noise wideband preamplifier is designed to enhance weak radio frequency signals across a broad spectrum, from 100 kHz to 6 GHz. Its compact design and robust performance make it suitable for a variety of applications, including receiver systems, software-defined radios, and EMC testing setups. This manual provides essential information for the safe and effective use of your HT004 amplifier.
2. Safety Information
Please read and understand all safety instructions before operating the device. Failure to do so may result in injury or damage to the device.
- Do not expose the device to moisture or extreme temperatures.
- Use only the specified power supply (TYPE-C cable).
- Avoid applying excessive voltage or current to the device.
- Do not attempt to open or modify the device, as this will void the warranty and may cause damage.
- Keep the device away from strong electromagnetic fields.
3. Package Contents
Verify that all items are present in your package:
- 1 x HTOOL HT004 Signal Amplifier (LNA unit)
- 1 x USB Type-C Cable
- 1 x Storage Box
4. Specifications
| Feature | Specification |
|---|---|
| Model Number | HT004 |
| Type | Signal Amplifier (Preamplifier) |
| Frequency Range | 100 kHz - 6 GHz |
| Gain | 20 dB |
| Noise Figure (NF) | 5 dB |
| P1dB | 10 dBm @ 2 GHz |
| Input/Output Impedance | 50 ohms |
| Power Supply | TYPE-C cable |
| Current Consumption | < 80 mA |
| Output Connector | SMA female |
| Dimensions (L*W*H) | 4.7 x 4 x 1.4 cm (without protruding SMA) |
| Weight | 35 g (including host + TYPE-C cable) |
| Material | Aluminium |
| Certification | CE |
Performance Curves:
The following graphs illustrate the typical performance characteristics of the HT004 amplifier across its operating frequency range.
5. Setup Instructions
Follow these steps to set up your HTOOL HT004 Signal Amplifier:
- Identify Ports: Locate the "RF-IN" (input), "RF-OUT" (output), "Type-C" (power), and "USB↔BAT" switch on the device.
- Connect RF Input: Connect your signal source (e.g., antenna, signal generator) to the "RF-IN" port using an appropriate SMA cable.
- Connect RF Output: Connect your receiver or measurement equipment to the "RF-OUT" port using an appropriate SMA cable.
- Powering the Device:
- For Battery-Free Version:
- Connect the provided USB Type-C cable to the "Type-C" port on the amplifier and to a 5V USB power source.
- Move the "USB↔BAT" switch to the "USB" position.
- The device will now be powered and ready for use.
- For Built-in Battery Version (if applicable):
- Connect the provided USB Type-C cable to the "Type-C" port on the amplifier and to a 5V USB power source.
- Move the "USB↔BAT" switch to the "BAT" position to charge the internal battery.
- Once charged, the device can operate on battery power.
- For Battery-Free Version:
- Power Indicator: A small LED indicator (next to the Type-C port) will illuminate when the device is powered on.
6. Operating Instructions
Once the HT004 amplifier is set up and powered, it operates automatically to amplify the incoming RF signal.
- Ensure all connections (RF-IN, RF-OUT, Power) are secure.
- Turn on your signal source and receiver/measurement equipment.
- The HT004 will provide a nominal 20 dB gain to the signal passing from RF-IN to RF-OUT.
- Monitor your receiver or spectrum analyzer for the amplified signal.
- For optimal performance, ensure the input signal level does not exceed the device's P1dB rating to avoid signal distortion.
Application Scenarios:
- BeiDou/GPS receiver systems
- General receiver systems (e.g., FM radio reception, radar reception)
- EMC receiver systems
- Software-defined radio (SDR) receiver front-ends
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents.
- Storage: When not in use, store the amplifier in its provided storage box in a cool, dry place, away from direct sunlight and extreme temperatures.
- Connector Care: Keep the SMA connectors clean and free from dust or debris. Avoid overtightening connections.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power indicator LED | No power supply or incorrect switch position. | Ensure the Type-C cable is securely connected to a 5V power source and the amplifier. Check the "USB↔BAT" switch is in the correct position ("USB" for direct power, "BAT" for battery charging/operation). |
| No signal amplification | Incorrect RF connections or faulty cables. | Verify that RF-IN is connected to the source and RF-OUT to the receiver. Check all SMA cables for damage and ensure they are securely tightened. Confirm the device is powered on. |
| Distorted output signal | Input signal level is too high, causing saturation. | Reduce the input signal power to the amplifier. The P1dB specification indicates the maximum linear operating point. |
9. User Tips
- For best results, use high-quality SMA cables and connectors to minimize signal loss.
- Consider the impedance matching (50 ohms) of your entire RF system for optimal power transfer.
- When using the battery version, ensure the battery is fully charged before portable use to maximize operating time.
10. Warranty and Support
This HTOOL product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For detailed warranty terms, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Please retain your proof of purchase for warranty claims.