To design self-resonant, single-layer chokes, starting with any length and
any diameter and number of turns of wire or coax, download program SOLNOID3.
This program will also estimate the temperature rise above ambient when a
given RF voltage is applied across it. And a lot of other features.

To make a current/choke balun, such as may be fitted between a balanced line
and a tuner, just wind 8 or 10 turns spaced turns of 18 or 20 gauge twin
speaker cable around a 1.75" or 2" diameter ferrite ring. Use HF grade
ferrite.

But best way to choke a coax feedline is to slide 10 or more ferrite hollow
cylinders over it. Space them out if you like.

For easy design of 4-to-1 impedance ratio voltage-baluns, using speaker-type
twin cable, download program TOROID.
----
=======================
Regards from Reg, G4FGQ
For Free Radio Design Software
go to http://www.g4fgq.com
=======================