This is how I checked my 49:1 unun for EFHW with NanoVNA:
73
Jon, VU2JO
On Wed, May 7, 2025 at 12:47?PM VK4CCV via groups.io <Fritzables=
[email protected]> wrote:
I purchased a H4 back about 12 ago.
Up until now, it's only been used for SWR testing, but now I want to test
the Chokes & Unun's I build.
I have watched a number of YouTube videos on how this done using S21.
I have noticed that most place a 10 dB Attenuator on the S21.
Is this really needed, or can I test without it?
Pete DU7/VK4CCV
