HTOOL HT004/HT004A Ultra Low Noise Amplifier (LNA) Module User Manual

1. Introduction

The HTOOL HT004 and HT004A are high-performance, wideband Low Noise Amplifier (LNA) modules designed for a variety of radio frequency (RF) and Software Defined Radio (SDR) applications. These modules are engineered to provide significant signal amplification while maintaining a low noise figure, making them ideal for enhancing weak signals in noise-sensitive environments.

Key Applications:

General purpose RF signal amplification
Software Defined Radio (SDR) systems
Wideband signal reception
Noise-sensitive RF applications

2. Safety Information

WARNING: To prevent damage to the LNA module, ensure that the power supply does not exceed 5V 1A. Using a power supply with higher voltage or current may permanently damage the device and will void the warranty.

Always handle the module with care to avoid electrostatic discharge (ESD) damage. Keep the device away from moisture and extreme temperatures.

3. Product Overview

The HTOOL LNA series includes two main models: HT004 and HT004A, each offering distinct gain characteristics while sharing a common wideband frequency range.

Figure 3.1: HTOOL HT004 and HT004A LNA modules, showing model names, frequency, preamplifier, input/output impedance, power supply, and gain.

HTOOL HT004 and HT004A LNA modules with specifications — Figure 3.2: HTOOL HT004 and HT004A LNA modules, highlighting "Ultra Low-Noise Amplifier 0.1MHz-6000MHz" and gain values (HT004: +20dB / HT004A: +30dB).

Both models operate across a wide frequency range of 0.1MHz to 6GHz and feature a standard 50 Ohm input/output impedance. The primary difference lies in their typical gain:

HT004: Provides a typical gain of 20dB, with +20dB of RF Gain at 35-2000MHz. This version is typically battery-free.
HT004A: Provides a typical gain of 30dB, with +30dB of RF Gain at 1000-3300MHz. This version often includes a built-in battery.

Applications of HTOOL LNA module — Figure 3.3: Diagram showing various applications for the LNA module, including satellite dishes, SDR, laptops, radios, and cellular base stations.

4. Specifications

Table 4.1: HTOOL HT004/HT004A Specifications
Feature	HT004	HT004A
Dimensions	68mm * 40mm * 15mm (approx. 2.7in * 1.6in * 0.6in)
Frequency Range	0.1MHz - 6GHz
Power Supply	5V 1A (via USB Type-C)
Input/Output Impedance	50Ω
Typical Gain	20dB	30dB
Battery	No Battery (external power required)	Built-in Battery (rechargeable)

Figure 4.1: Dimensions of the LNA module (4.8cm/1.9inch length, 4cm/1.6inch width, 1.5cm/0.6inch height).

Figure 4.2: Comparison table for HT004 and HT004A, detailing dimensions, frequency, power supply, impedance, battery status, and gain.

5. Package Contents

The standard package for the HTOOL LNA module typically includes:

1 x HTOOL LNA Module (HT004 or HT004A)
1 x USB Type-C Cable
1 x Storage Box

Note: Specific contents may vary based on the purchased variant (e.g., "HT004 and Battery" or "HT004A and Battery" options may include a compatible battery).

Package contents for HT004 LNA module — Figure 5.1: Package contents for HT004, showing the LNA module, USB Type-C cable, and storage box.

6. Setup

Follow these steps to set up your HTOOL LNA module:

Power Connection:
- For the battery-free version (HT004): Connect the provided USB Type-C cable to the LNA module and a 5V 1A power source. Ensure the switch on the module is moved to the "USB" position.
- For the built-in battery version (HT004A): Connect the provided USB Type-C cable to the LNA module and a 5V 1A power source. Move the switch on the module to the "BAT" position to charge the internal battery. Once charged, the module can operate without continuous USB power.
Important: Do not use a power supply exceeding 5V 1A.
RF Connections: Connect your RF input source (e.g., antenna, signal generator) to the input SMA connector of the LNA module. Connect the output SMA connector of the LNA module to your receiving device (e.g., SDR, spectrum analyzer). Ensure all connections are secure.

Powering instructions for battery-free and built-in battery versions — Figure 6.1: Powering instructions for battery-free (HT004) and built-in battery (HT004A) versions, showing USB connection and switch positions.

Internal view of the No Battery Version (HT004) — Figure 6.2: Internal view of the "No Battery Version" (HT004), showing USB-C port, SMA connector, and internal dimensions. This version is compatible with a 3.7V 500mAh 603030 battery (not included).

7. Operation

Once the LNA module is properly set up and powered, it will begin amplifying the incoming RF signal. No further user interaction is typically required for basic operation.

Signal Enhancement: The LNA will boost weak signals, improving the signal-to-noise ratio for your receiver.
Monitoring: Observe the amplified signal on your connected SDR software or spectrum analyzer.

Application example with HT004 connected to a Spectrum Analyzer & Signal Generator — Figure 7.1: Application example with the HT004 connected to a Spectrum Analyzer & Signal Generator, demonstrating its use in RF measurement.

8. Maintenance

To ensure the longevity and optimal performance of your HTOOL LNA module, follow these maintenance guidelines:

Cleaning: Use a soft, dry cloth to clean the exterior of the module. Do not use liquid cleaners or solvents.
Storage: Store the module in a dry, cool environment, away from direct sunlight and extreme temperatures. The provided storage box is ideal for protection.
Power Supply: Always use a stable 5V 1A power supply. Avoid using unregulated power sources or those with incorrect voltage/current ratings.
Connections: Periodically check RF and USB connections for tightness and corrosion.

9. Troubleshooting

Table 9.1: Troubleshooting Guide
Problem	Possible Cause	Solution
Module does not power on	Incorrect power supply; Loose USB connection; Switch in wrong position (for battery version)	Verify 5V 1A power supply; Ensure USB cable is securely connected; For HT004A, ensure switch is in "BAT" or "USB" position as needed.
No signal amplification	Incorrect RF connections; LNA not powered; Overload from strong signal	Check input/output RF cable connections; Confirm LNA is powered on; Reduce input signal strength if overloading is suspected.
Excessive noise or distortion	Improper grounding; Over-amplification of noise; Power supply noise	Ensure proper grounding of your RF system; Verify power supply quality; Consider adding filters if external noise is an issue.

10. User Tips

Noise Figure (NF): While not explicitly stated in the general product description, the Noise Figure is a critical specification for LNAs. For optimal performance in highly sensitive applications, consult the detailed datasheet for the specific Noise Figure of your HT004 or HT004A model.
Impedance Matching: Ensure that your antenna and receiver are properly impedance matched to the LNA's 50 Ohm input/output for maximum power transfer and minimal signal reflection.
Power Source Quality: A clean, stable 5V 1A power source is crucial for the LNA's performance. Noisy power can introduce unwanted artifacts into the amplified signal.

11. Warranty and Support

HTOOL warrants this product against defects in materials and workmanship under normal use for a specified period (please refer to your purchase documentation for exact warranty duration). This warranty does not cover damage caused by misuse, accident, unauthorized modification, or improper power supply (e.g., exceeding 5V 1A). Damage resulting from using a power supply greater than 5V 1A is explicitly not covered under warranty.

For technical support, troubleshooting assistance, or warranty claims, please contact your retailer or the manufacturer directly with your product model and purchase details.

HTOOL HT004 Series