Start using NanoVNA

What you need to work 

The following are required at a minimum.

  • NanoVNA body
  • SMA LOAD 50Ω
  • SMA Female to Female Through Connector
  • SMA Male to Male cable x 2

NanoVNA basics 

VNA (Vector Network Analyzer) measures the frequency characteristics of reflected power and passing power of a high frequency network (RF Network).

NanoVNA measures the following elements:

  • Input voltage I / Q signal
  • Reflected voltage I / Q signal
  • Pass voltage I / Q signal

From here we calculate:

  • Reflection coefficients S11
  • Transmission coefficient S21

The following items that can be calculated from these can be displayed.

  • Reflection loss
  • Passing loss
  • Complex impedance
    • resistance
    • reactance
  • SWR


NanoVNA oscillation frequency 

NanoVNA measures the reflection coefficient and transmission coefficient for 101 points in the frequency band to be measured.

The local frequency of NanoVNA is 50kHz to 300MHz. For higher frequencies, use harmonic mode. The fundamental wave is not attenuated even in harmonic mode. The usage modes for each frequency are as follows.

  • Up to 300 MHz: fundamental wave
  • 300MHz to 900MHz: 3rd harmonic
  • 900MHz to 1500MHz: 5th harmonic

Note that there is always a fundamental wave input, especially when checking the amplifier gain.

In either case, the input is converted to an intermediate frequency of 5kHz. The signal is converted from analog to digital at 48kHz sampling. Digital data is signal processed by the MCU.

To do first

Before you can use it, you must first calibrate it. First, calibrate as follows.

input method

NanoVNA has the following inputs.

  • Touch panel long tap
  • Lever switch
    • L / L long press
    • R / R long press
    • Push / Push long
  • Power slide switch

This page was translated from cho45’s NanoVNA User Guide.