Quote:
Originally Posted by WM6
It is simple, if you have L-meter (inductance meter).
You need to wind 10 (or better 20 or 30) testing turns of wire (diameter about 0.3 or so) on ferrite rod antenna you have.
Then measure inductance.
Par example:
If you wound 30 testing turns and then measured inductance is 15mH, then you calculate total turns this way:
30 / 15 = 2
This mean that you need 2 of turns to get 1mH.
To get 50mH you need 50x2(turns)=100 (turns).
So you need 100 turns in total on your ferrite rod to get 50mH ferrite cored antenna.
Ferrite cored transmitter antenna is not the best solution for TX, air cored antenna is better. Of course it depend of what you need and what you try to build. If you need "shielded" (i.e. mounted in a tin can) antenna (to radiate in one direction) ferrite core antenna can be better solution than air core.
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tank you very much dear freind