FT240-43 Torroid, Can I use my NanoVNA to meassure my several torroids
to be sure that I have the correct ones for HF UNUN?
any info is welcome
Hello
Unun means nothing. You should know that the nature of the material of the torus is of great importance if you make a choke (self) with it. If you made a RUTHROFF transformer, it is much less important.
To test the torus, a self must be made. To measure the characteristics, enough turns are needed to cover the *entire* torus. My measurements were failing when I didn't do that. Count the number of coils carefully, you will need this number later. It is the number of wires visible inside the torus that counts; a wire that passes straight is counted as a turn.
You will thus be able to measure, with the NanoVNA, a self (?H) according to the frequency etc. You will be able to calculate the Al and you will be able to calculate the ?r which will allow you to check the nature of the material.
It is not at all an easy thing to do.
73
--
F1AMM
Fran?ois
De la part de Kurt Heernaert
Envoy¨¦ : mercredi 21 juin 2023 21:32
