Beware of cheap underperforming clones

As of 2022 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

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calibration questions

Anne Ranch 2022/12/13 05:04

I have no yet study the manuals , especially on subject of calibration , so this may be premature to ask.
I have my nanoVNA calibrated WITHOUT the coax I am using to access my test antennas.

It works as expected with my 28MHz dipole and UNKNOWN length of RG6  cable connecting it.

Just for drill - I like to calibrate this setup INCLUDING the RG6.

I have some calibration  files saved ,but have not open them.

Assuming they are "humanly readable"  - is there a specific value I should look for / at to see how it changes
AFTERWARD  the RG6 is added to the equation ?

Or  - is there a  display , in nanoVNASaver , I could use for comparison ?


Michael Brun 2022/12/14 03:38

if you calibrate the unit using the PC software, and then save the calibration, a .cal file will materialize.   The file is merely a text file that can then be opened for viewing.  I did this first time this past weekend.  If you are using a NanoVNA equipped with an SD card and firmware that supports its use, you may be able to save a custom calibration and then open the resulting file to view its contents.

I just recently upgraded the firmware on my H4 with the latest from DiSlord and I observed the SD menu options.   I do not have an SD in mine so I have not tested this new feature.

cbrabandt 2022/12/14 08:21

Hi Anne,

I'm new to VNAs and I am certain that there are far more knowledgeable sources of help here but this video helped me to understand calibration using port extension:

After calibrating at the VNA, if you want to calibrate WITH the RG6, you'll need to at least adjust the port extension setting with the trace (phase trace is useful) produced with the end of the cable left open.

To properly calibrate for different adapters and connectivities, I pretty quickly realized after watching the above video that a set of calibration standards in other than SMA would be helpful, but usually not essential for my purposes.

Cal  AD8Q

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