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Balun and Transformer Core Selection


Balun and Transformer Core Selection

Occasionally errors are made regarding core selection. This especially includes baluns
post 21 Nov 2019

Balun and Transformer Core Selection

Toroid & balun Links

4:1 coax balun design CALCULATOR
Here we calculate the half wave length of the matching section of the 4:1 coax balun

50 ohm single-band baluns, I0JX
The balun herein described is suitable for 50-ohm monoband antennas which can often represent a valid choice

9:1 balun
Primary winding black 30 turns,secondary winding brown 10 turns

A balun using ferrite rod, M0SCG
They simply allow a balanced item like a centre fed dipole to be fed with an unbalanced system like coax or balanced feeder open wire balanced to an unbalanced

A Cost Effective Current-mode 1:1 Balun
A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors