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Re: High impedance measurement with VNA?

 

One way might be to use a transformer. ?Minicircuits has small, inexpensive transformers in a DIP package in ratios up to 16:1 or 25:1.

1:25 CORE & WIRE Transformer, 0.02 - 30 MHz, 50? | TT25-1-X65+ | Mini-Circuits ( )
minicircuits.com ( )

( )

That will get you from 50 ohms to 1250 ohms.

End fed antennas are tricky to measure (and model), because in most cases, the outside of the feedline winds up being part of the antenna.


On Feb 26, 2025, at 06:49, Christian BARTHOD F8GHE via groups.io
<cbarthod@...> wrote:


? Hi,
Currently trying to design and tune a 1/2 end fed antenna (RF is applied
on one end), I am looking for the correct method to measure its impedance.
As this one is very high I don't know the right méthode !

The result of this measurement should allow me to create a Stub with
SimNEC to tune it.
Thanks in advance for your help

--
73 s Christian F8GHE






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