G4NSJ – NanoVNA Nano VNA antenna analyser

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This is my NanoVNA or Nano VNA H4. Its an antenna analyser, amongst many other things. And it’s incredible. After checking all my aerials, I decided to find out what else the VNA could do.

The NanoVNA is pictured below along with a few of the adaptors I bought separately.

Pictured below is a small box I made up for connecting to both VNA ports. At the frequencies I’m interested in, medium wave to 30MHz, the length of the crock clip leads won’t affect the test results. If I were to check VHF, UHF and higher, the lead length would come into play and give me false readings. Patch leads connect the female SMA ports to the VNA.

NanoVNA Test Lead Box

Below are a few non-technical videos of my NanoVNA in action. I say non-technical because I wanted to explain the basic operation of the unit to newcomers to the hobby. Too many people are frighten off by in-depth theory and mathematics when all that is needed to get started is a simplified explanation. Further learning can come later. The first video concerns SWR and antenna resonance. The second video deals with tuned circuits. The third video shows test results from a common mode choke. The fourth video explains how to set up and use both ports on the VNA for measurement.

SWR and Aerial Resonance.

Tuned Circuits.

Common Mode Chokes and Coax.


Link to article by Steve Hunt here.

How to set up and use CH0 and CH1.

Common Mode Chokes.

My FT240-31 ferrite ring has arrived. I’ve wound 8 turns of RG8X Mini8 coax on the ring to form a common mode choke to cover the HF spectrum. I’ve checked the results on my NanoVNA… see video above. Below is the coax wound on the ferrite ring. The box was rather small so it was a bit of a squeeze.

 

The NanoVNA as a signal generator.

I keep discovering more secrets hidden within the NanoVNA. It can be used as a basic signal generator! I’m not sure that this discovery warrants a video, but I’ll give it some thought.

The NanoVNA and crystal filters.

I’ve been checking a 1.6MHz USB I.F. quartz crystal filter with the NanoVNA. Again, I’m not sure that this discovery warrants a video, but I’ll give it some thought.

Maybe I should make a video combing the NanoVNA as a signal generator and checking the crystal filter.

NanoVNA Settings Notes.

The notes below take you through the setup procedure for checking SWR and aerial resonance and tuned circuits and quartz crystal frequencies. I’ll soon be adding another video dealing with checking quartz crystals.

TO CHECK AERIAL SWR – port CH0

TO CHECK RESONANCE OF TUNED CIRCUITS, COMMON MODE CHOKES AND QUARTZ XTAL fx – Ports Ch0 and CH1

Menu Menu
Trace Trace
Trace yellow SWR Trace blue Logmag
Back Back
Format Format
SWR Logmag
Back Back
Stimulus Stimulus
Enter start fx Enter start fx
Enter stop fx Enter stop fx
Back Back
Cal Cal
Reset Reset
Calibrate CH0 Calibrate CH0
Open Open
Short Short
Load Load
Done Isolate (load to CH1)
Save to location Thru (connect ports together)
Connect Ant Done
Marker Save to location
Search Marker
Minimum Search
Reading shows resonant fx and SWR Minimum
Reading shows resonant fx of tuned circuit or crystal