1 pcs Purple-4C65 'AMIDON' Toroide core.
1.8 meter of 1.5mm enameled CU-Wire
1 pcs Chassi connector SO-259
2 pcs of chassi connectors or screws for the dipole connections

Impedance ratio........... 1:1
Frequency range...... 3-30 MHz
Power handeling........... 2KW

Readymade baluna in sutable 'nonconducting' cower

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- 1:1 Impedance ratio baluna -
Principle - The coils on an Ferrite-balun is not different from an air balun, in the layout below you see the principle.

Electrical principle scheme


Winding layout on toroid core

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- 1:4 Impedance ratio baluna -



Electrical principle scheme


Winding layout on toroid core

- Making the balun -
I start to prepare the firrite-core,- to prevent ruff edges on the cor to damage the insulation on the cu-wire, i use electrical pvc-tape. This also increase the power handeling capacity of the ready made balun. Notice also that the described baluna is 1:4 in ratio,- used for my multi-band dipole.


First i put some pvc-tape on the core with about
half of it overlapping the edge, i then cut the over-
lapping tape in slices to be able to fold it over the
core side.


Ready pvc-taped core


Core with two windings (Note! This is a 1:4 ratio balun core)


The core inside the box,- i glue it in place, an then make al the connections.
(Note! This is a 1:1 ratio core in the box)


Ready made! Just to screw it together.