RF Demo Kit NanoVNA VNA Test Board Instruction Manual

1. Introduction

The DEEPELEC RF Demo Kit is a specialized test board designed for learning and experimenting with Vector Network Analyzers (VNAs), such as the NanoVNA. It features 18 different RF circuits, allowing users to explore various RF phenomena including RLC circuits, filters, attenuators, and basic calibration standards (short, open, load, thru). This manual provides detailed instructions for setting up and operating the kit to maximize your learning experience.

2. Package Contents

Please verify that all items listed below are included in your package:

• 1 x RF Demo Kit PCB (10x10cm)
• 2 x SMA U.FL/IPX to SMA Male Connector RG178 Pigtail Cables (20CM)

3. Setup Instructions

To begin using your RF Demo Kit, follow these steps to connect it to your NanoVNA:

1. Ensure your NanoVNA is powered off before making any connections.
2. Identify the two SMA U.FL/IPX to SMA Male Connector RG178 Pigtail Cables.
3. Connect the U.FL/IPX end of each cable to the corresponding U.FL/IPX connectors on the RF Demo Kit PCB for the desired circuit.
4. Connect the SMA Male end of the cables to the NanoVNA's PORT 1 and PORT 2 (or CH0 and CH1) connectors. Ensure connections are finger-tight to avoid damage.
5. Power on your NanoVNA.
6. Perform a calibration on your NanoVNA using appropriate calibration standards (Short, Open, Load, Thru) if necessary, or use the corresponding circuits on the demo kit for learning calibration principles.

4. Operating Instructions: Exploring the 18 Circuits

The RF Demo Kit provides 18 distinct circuits for various RF measurements. For each circuit, connect your NanoVNA as shown in the examples and configure the VNA with the suggested parameters to observe the circuit's characteristics.

Circuit Overview

Smith Chart Reference

Individual Circuit Tests

• Circuit 1: RLC Series-parallel circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=600MHz

  

• Circuit 2: RLC Series-parallel circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=600MHz

  

• Circuit 3: 33 ohm Resistance
  Display: S11 Smith Chart & SWR
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 4: 75 ohm Resistance
  Display: S11 Smith Chart & SWR
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 5: BSF Ceramic Notch, Centre Freq = 6.5MHz
  Display: S21 LOGMAG
  Parameters: START=5.5MHz, STOP=7.5MHz

  

• Circuit 6: BPF Ceramic Filter, Centre Freq = 10.7MHz
  Display: S21 LOGMAG
  Parameters: START=9.7MHz, STOP=11.7MHz

  

• Circuit 7: RC series circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=300MHz

  

• Circuit 8: LC series circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=600MHz

  

• Circuit 9: Single capacitance
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=300MHz

  

• Circuit 10: Single inductance
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=30MHz

  

• Circuit 11: Homemade low-pass filter, 3dB bandwidth 400MHz
  Display: S21 LOGMAG
  Parameters: START=100MHz, STOP=600MHz, SCALE=2dB

  

• Circuit 12: Homemade high-pass filter, 3dB bandwidth 500MHz
  Display: S21 LOGMAG
  Parameters: START=1MHz, STOP=1000MHz, SCALE=10dB

  

• Circuit 13: Short Circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 14: Open Circuit
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 15: 50 ohm Circuit (Load)
  Display: S11 Smith Chart
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 16: Through Circuit
  Display: S21 LOGMAG
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 17: 10dB attenuation circuit
  Display: S21 LOGMAG
  Parameters: START=50kHz, STOP=1000MHz

  

• Circuit 18: 3dB attenuation circuit
  Display: S21 LOGMAG
  Parameters: START=50kHz, STOP=1000MHz

  

For additional tutorials and detailed explanations, please refer to the official DEEPELEC RF Demo Kit tutorial page: deepelec.com/rf-demo-kit/

5. Specifications

6. Maintenance

To ensure the longevity and proper functioning of your RF Demo Kit, please observe the following maintenance guidelines:

• Handling: Always handle the PCB by its edges to avoid touching the components or traces, which can introduce oils or dirt.
• Cleaning: If necessary, gently clean the PCB surface with a soft, dry cloth. For stubborn dirt, use isopropyl alcohol and a cotton swab, ensuring the board is completely dry before use.
• Storage: Store the kit in a dry, dust-free environment, preferably in an anti-static bag or container, to prevent damage from static discharge or environmental factors.
• Connections: Be gentle when connecting and disconnecting the SMA cables to prevent damage to the connectors on both the PCB and your NanoVNA.

7. Troubleshooting

If you encounter issues while using your RF Demo Kit, consider the following common troubleshooting steps:

• No Signal/Incorrect Readings:
  • Check all cable connections to ensure they are secure and correctly attached to the NanoVNA ports and the desired circuit on the demo board.
  • Verify that your NanoVNA is properly calibrated for the frequency range you are testing.
  • Ensure the NanoVNA's display settings (e.g., S11, S21, LOGMAG, Smith Chart) match the recommended settings for the circuit you are testing.
  • Inspect the pigtail cables for any visible damage or kinks.
• Physical Damage:
  • Visually inspect the PCB for any bent pins, loose components, or damaged traces.

8. User Tips

• Start with Calibration: Always perform a proper calibration on your NanoVNA before taking measurements, especially when changing frequency ranges or cable setups.
• Experiment with Parameters: Don't hesitate to adjust the START/STOP frequencies and SCALE settings on your NanoVNA to get a clearer view of the circuit's characteristics.
• Document Your Findings: Keep a log of your measurements and observations for each circuit. This will help reinforce your understanding of RF principles.
• Explore Online Resources: The NanoVNA community is vast. Search for online forums, videos, and tutorials to deepen your knowledge and find advanced testing techniques.

9. Warranty and Support

For any questions, technical support, or warranty inquiries regarding your DEEPELEC RF Demo Kit, please contact the seller or manufacturer directly through the platform where the product was purchased. Ensure you have your purchase details readily available for faster assistance.