1. Introduction and Overview
The SEESII NanoVNA-H4 is an upgraded Vector Network Analyzer designed for precise measurement of RF parameters. Featuring the latest V4.3 hardware, a 4.0-inch resistive touchscreen, and a wide measurement range of 10KHz to 1.5GHz, it is an essential tool for electronics engineers, amateur radio operators, and DIY enthusiasts. This device excels in evaluating antenna resonance, SWR, S parameters, phase, delay, and Smith Chart analysis.
Its compact and portable design, coupled with a built-in 1950mAh rechargeable battery, makes it ideal for both benchtop and field use. The NanoVNA-H4 also includes a MicroSD card slot for data storage and supports PC and Android phone control for advanced analysis.
2. Package Contents and Setup
2.1. Package Contents
Upon unboxing your NanoVNA-H4, please verify that all components are present:
- 1x NanoVNA-H4 unit (with 1950mAh battery)
- 1x USB Type-C cable
- 2x 15cm SMA male to male RG316 RF cables
- 1x SMA male calibration kit - OPEN
- 1x SMA male calibration kit - SHORT
- 1x SMA male calibration kit - LOAD
- 1x Touchscreen pen
Figure 2.1: The NanoVNA-H4 unit along with its complete set of accessories, including cables and calibration kits.
Figure 2.2: The NanoVNA-H4 connected via USB-C for charging, indicating the built-in 1950mAh rechargeable battery.
2.2. Initial Setup
- Charging the Device: Connect the NanoVNA-H4 to a USB power source using the provided USB Type-C cable. The charging indicator will illuminate during charging.
- Power On: Locate the power switch on the side of the device and slide it to the ON position. The screen will light up, displaying the main interface.
- Removing Protective Covers: If present, remove any protective covers from the SMA ports (PORT1 and PORT2) before connecting cables.
3. Operating Instructions
3.1. Touchscreen Operation
The NanoVNA-H4 features a 4.0-inch resistive touchscreen. It can be operated using your finger, the included touchscreen pen, or a non-conductive paddle for precise control.
Figure 3.1: The 4.0-inch resistive touchscreen of the NanoVNA-H4, designed for sensitive and fast reading.
Video 3.1: An instructional video demonstrating the basic usage and features of the SEESII NanoVNA-H4 Vector Network Analyzer, including touchscreen interaction and power-on sequence.
3.2. Basic Measurements
The NanoVNA-H4 is capable of measuring various parameters including S Parameters (S11/S21), Voltage Standing Wave Ratio (VSWR), Phase, Delay, and Smith Chart. The default firmware is primarily configured for antenna performance measurement.
For comprehensive S11/S21 parameter measurements using the TX/RX method, manual replacement of the transceiver port wiring may be required.
3.3. Calibration
Calibration is crucial for accurate measurements. The NanoVNA-H4 features a built-in calibration function. It is recommended to perform calibration whenever the frequency range to be measured is changed.
Use the provided SMA male calibration kit (OPEN, SHORT, LOAD) for precise calibration. Refer to the on-screen menu for calibration steps.
Figure 3.2: The NanoVNA-H4 demonstrating its built-in calibration function, essential for accurate measurements, with the OPEN, SHORT, and LOAD calibration standards.
3.4. Data Storage and PC/Android Connection
The device includes a MicroSD card port, supporting up to 32GB memory cards (not included). This allows you to save field test data or screenshots directly to the card.
Figure 3.3: The NanoVNA-H4 featuring a MicroSD card slot for convenient data storage, supporting up to 32GB memory cards.
For advanced analysis and data management, the NanoVNA-H4 can connect to a PC using the NanoVNASaver software. This software allows you to extract data for display on a computer and save it to Touchstone (.snp) files, which are compatible with various radio design and simulation software.
Additionally, the device supports control via Android phones using the NanoVNA-Web-Client/WebAPP.
Figure 3.4: The NanoVNA-H4 connected to a laptop, illustrating its compatibility with PC software for enhanced control and data analysis.
4. Maintenance
To ensure the longevity and optimal performance of your NanoVNA-H4, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the device. Avoid abrasive cleaners or solvents that could damage the screen or casing.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures. When not in use, it is advisable to keep it in its original packaging or a protective case.
- Battery Care: For prolonged storage, ensure the battery is charged to approximately 50%. Avoid fully discharging the battery for extended periods.
- Port Protection: Always use the provided protective caps for the SMA ports when not in use to prevent dust and damage.
5. Troubleshooting
If you encounter issues with your NanoVNA-H4, consider the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Low battery or power switch off | Ensure the battery is charged. Check the power switch position. |
| Inaccurate measurements | Improper calibration or faulty cables/connectors | Perform a full calibration. Check all cable connections and ensure they are secure. Inspect cables for damage. |
| Touchscreen unresponsive | Software glitch or physical damage | Restart the device. Use the touchscreen pen for more precise input. If the issue persists, perform a touch test (CONFIG-TOUCH TEST) as shown in the video. |
| Cannot connect to PC/Android | Incorrect drivers, cable issues, or software settings | Ensure correct drivers are installed on your PC. Try a different USB cable. Verify software settings on both the device and the computer/phone. |
For more detailed troubleshooting or persistent issues, please refer to the official NanoVNA community forums or contact SEESII customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | NanoVNA-H4 |
| Measurement Frequency Range | 10KHz - 1.5GHz |
| Display Screen | 4.0 inch LCD Touchscreen |
| Dynamic Range (50K-300MHz) | > 70dB |
| Dynamic Range (300M-900MHz) | > 60dB |
| Dynamic Range (900M-1.5GHz) | > 40dB |
| Battery Capacity | 1950mAh Lithium Ion |
| MicroSD Card Support | Up to 32GB (card not included) |
| PC Connection | Via NanoVNASaver software |
| Android Phone Control | Via NanoVNA-Web-Client/WebAPP |
| Dimensions | 6.69 x 5.04 x 2.09 inches |
| Weight | 11.68 ounces |
7. Warranty and Support
SEESII is committed to providing professional technical support and ensuring customer satisfaction. Your NanoVNA-H4 comes with a 36-month warranty.
- Customer Service: We offer 24-hour quick response for any inquiries or issues you may have.
- Technical Support: Our experts are available to assist you with any technical questions or operational guidance.
- Satisfaction Guarantee: We strive for 100% customer satisfaction. If you are not satisfied with your NanoVNA-H4 or have any concerns, please do not hesitate to contact us.
For support, please reach out to the SEESII customer service team through the platform where you purchased the product or visit the official SEESII website for contact information.
