Just make sure, as others have pointed out, that you don¡¯t have any other wires (power supply, USB to computer,, etc) connected to the nanoVNA.
73, Willie N1JBJ
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On Feb 17, 2022, at 10:10 AM, Jim Lux <jim@...> wrote:
On 2/17/22 5:52 AM, WB2UAQ wrote:
We're measuring impedance here. No matching transformer is needed. Just a 1:1 high common mode Z balun. From the Z's measured you determine the characteristics of the balanced transmission line OR and that includes its electrical length. Let's not over complicate things here.
Considering that the NanoVNA is smaller than a lot of HF baluns for balanced lines, I don't think you need the balun, either (until you get up to where the NanoVNA is a significant fraction of a wavelength - maybe don't use it for UHF TV twinlead.
