Balun and Choke Reference

Quick reference for ferrite core selection and winding recommendations.

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Frequency range - Low (MHz)

e.g. 1.8 for 160m band

Frequency range - High (MHz)

e.g. 2.0 for upper 160m

TX power (watts)

Continuous power rating

Duty cycle

Ferrite mix selection: 43 (low/HF), 31 (general), 77 (low freq/HF), 61 (UHF). Core size should dissipate heat; 1.25" OD typical for HF.