Measuring Coax loss with NanoVNA-F V2

RG58C

It’s been a while since I last posted something here. Recently, I measured the insertion loss of a couple of coaxial cables that I had using my NanoVNA.

I wanted to select a feeder cable for a 20m dipole. I had a length (almost 43m) of RG58C and a shorter length of unknown coax used by telecommunication service providers. 

And this was a good chance to see the NanoVNA in action.

Configuring NanoVNA

Results

coax-1-unknown
RG58C

See the difference in the curves. I have added markers for 40m, 20m and 2m frequencies for reference. The cable used in telecomms shows barely minimum loss even at VHF.

Just for fun, I compared the measured results of RG58C with the calculated ones using this calculator.

 

Right on the money!

 

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