1. Introduction
The HTOOL HT008 MAX2871 RF Signal Generator is a versatile module designed for generating sine waves across a wide frequency range. It features dual channel outputs, precise frequency control, and amplitude regulation, making it suitable for various electrical and RF applications. This manual provides detailed instructions for setting up, operating, and maintaining your HT008 device.
2. Product Features
- Generates sine waves from 23.5MHz to 6000MHz.
- High frequency resolution of 78Hz (for frequencies 46MHz or less).
- Extremely low phase noise: -111dBc at 3GHz, 100KHz offset.
- Supports both sweep and point frequency working modes.
- Integrated USB serial port for communication.
- Supports serial commands for secondary development.
- USB serial port control for frequency sweep/point frequency operation.
- Can be powered via USB or a 5V 1A lithium battery.
- Dual Channel Signal Outputs:
- Channel 1: Four amplitude levels: -4dBm, -1dBm, 2dBm, 5dBm.
- Channel 2: Eleven amplitude levels from -15dBm to -25dBm.
- Channel 2 includes an added attenuator with an attenuation range of -15dBm to -25dBm, controllable in 1dBm steps (11 stops). This improves linearity of the output amplitude without external attenuators.
- Algorithmic compensation ensures a flatter response in the 23.5MHz to 6200MHz range, with an error accuracy of less than 0.5dBm.
3. Hardware Overview
- **Power switch**: Controls the device's power.
- **USB power supply port/computer connection port**: Used for powering the device and connecting to a computer for control.
- **Nylon isolation feet**: Provides stability and electrical isolation.
- **Display screen**: 0.96 inch (90x160) OLED screen for displaying operational modes and values.
- **Button control**: Used for navigating menus, selecting options, and adjusting values. The middle button typically serves as a confirmation button.
- **CH1 (Channel 1)**: RF output channel 1.
- **CH2 (Channel 2)**: RF output channel 2.
- **BAT+**: Positive terminal for external battery power supply.
- **BAT-**: Negative terminal for external battery power supply.
The module is built around the MAX2871 chip and controlled by a GD32F303 microcontroller. It includes a CH340G chip for USB to serial port communication, which may require driver installation on your computer.
4. Setup
4.1 Powering the Device
- **USB Power Supply**: Connect the HT008 to a computer or a 5V 1A USB power adapter using the provided USB cable. The USB port (labeled 2 in Figure 3) serves both for power and data communication.
- **Battery Power Supply**: For improved noise suppression and spurious performance, you can power the device using an external 5V 1A lithium battery connected to the BAT+ (8) and BAT- (9) terminals. When using battery power, a USB connection for power is not required.
4.2 Computer Connection and Driver Installation
The HT008 uses a CH340G chip for USB serial communication. Before using the host computer software, you may need to install the appropriate CH340G driver for your operating system. Drivers are typically available from the CH340G manufacturer's website or the product's support page.
4.3 Initial Power On
Once powered, switch on the device using the power switch (labeled 1 in Figure 3). The OLED display (labeled 4 in Figure 3) should light up, showing the main menu or the last active mode.
5. Operating Instructions
5.1 User Interface (UI) Navigation
The device is controlled via the buttons (labeled 5 in Figure 3) and the OLED display. Use the buttons to navigate through menu options, move the cursor, and adjust values. The middle button typically confirms selections.
5.2 Operating Modes
- **Point Mode**: Outputs a single frequency, fixed amplitude signal.
Figure 6: Display in Spot Frequency Mode (e.g., 3000.000 MHz, -15dB, CH2). - **Sweep Mode**: Outputs a signal where the frequency automatically and continuously sweeps or steps over a defined range.
Figure 7: Display in Sweep Mode showing start/stop frequencies (e.g., Start: 23.500 MHz, Stop: 6000.000 MHz, Mode: Single ON). 
Figure 8: Display in Sweep Mode showing step width and sweep interval (e.g., Step: 100.000 MHz, Time: 39 Ms). - **Sweep SET**: Configures the parameters for Sweep Mode.
- **Ampl Shift (Amplitude Shift Configuration)**: Allows customization of amplitude size and amplitude calibration.
Figure 9: Display in Amplitude Calibration Mode (e.g., Ample: +0). Calibration interval is -15 to +15.
5.3 Host Computer Software
The HT008 can be controlled via dedicated host computer software. This software provides a graphical interface for setting parameters and monitoring the signal generator. Ensure the CH340G driver is installed before connecting the device to your computer and launching the software.
The software typically offers "Point Mode" and "Sweep Mode" controls, mirroring the device's on-board UI but with enhanced visual feedback and ease of input.
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | HT008 |
| Brand Name | HTOOL |
| Type | RF Signal Generator |
| Frequency Range | 23.5MHz - 6000MHz (6GHz) |
| Frequency Resolution | 78Hz (for frequencies ≤ 46MHz) |
| Phase Noise | -111dBc @ 3GHz:100KHz |
| Output Channels | Dual Channel |
| Channel 1 Amplitude | -4dBm, -1dBm, 2dBm, 5dBm |
| Channel 2 Amplitude | -15dBm to -25dBm (11 stops, 1dBm granularity) |
| Display | 0.96 inch (90x160) OLED screen |
| Control Interface | On-board buttons, USB serial port (CH340G) for host computer control |
| Power Supply | USB (5V 1A) or 5V 1A Lithium Battery |
| Dimensions (approx.) | 7cm (width) x 5.5cm (height) / 2.7inch x 2.1inch |
7. Maintenance
- **Cleaning**: Use a soft, dry cloth to clean the device. Avoid using liquids or abrasive cleaners.
- **Storage**: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- **Handling**: Handle the module with care to avoid damaging the sensitive electronic components or connectors.
- **Power Supply**: Always use a stable 5V 1A power source (USB or battery) to prevent damage to the internal circuitry.
- **Firmware Updates**: Check the manufacturer's website periodically for any available firmware updates to ensure optimal performance and access to new features.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | No power supply or faulty connection. | Ensure USB cable is securely connected and power source is active. If using battery, check battery charge and connection. Verify power switch is ON. |
| Display is blank or unresponsive. | Power issue or device freeze. | Check power supply. Try power cycling the device (turn off, wait a few seconds, turn on). |
| Host computer software cannot connect to the device. | Missing or incorrect CH340G driver. | Install the correct CH340G driver for your operating system. Ensure the device is powered on and connected via USB. Check COM port settings in the software. |
| Inaccurate frequency/amplitude output. | Calibration needed or external interference. | Perform amplitude calibration using the "Ampl Shift" menu. Ensure proper shielding and grounding to minimize external interference. Consider using a high-performance power supply for better noise suppression. |
9. User Tips
- **Driver Installation**: If you plan to use the host computer software, make sure to download and install the CH340G serial port driver for your operating system. This is a common step for many USB-to-serial devices.
- **External Power for Performance**: For applications requiring the best possible signal quality, especially with minimal noise and spurious emissions, consider powering the HT008 with a dedicated 5V 1A lithium battery or a high-quality external power supply instead of relying solely on USB power from a computer.
- **Experiment with Modes**: Familiarize yourself with both "Point Mode" for fixed frequency generation and "Sweep Mode" for testing frequency responses. The host software can make these operations more intuitive.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official HTOOL product page or contact the seller directly. Keep your purchase receipt as proof of purchase for any warranty claims.
This device is intended for use by individuals with appropriate technical knowledge in electronics and RF engineering. Improper use or modifications may void the warranty and could lead to damage or injury.