Diagnostic guide for mis-matched baluns (what to test and what it means)
Step 1 — Identify the symptom category A) “SWR is high everywhere” Likely causes: Action: B) “SWR is reasonable, but RF in the shack / hot mic /…
HF
HF
Ferrite core selection charts
A. Which mix to use (HF-focused) Mix Best general region Typical “why” Practical guidance Mix 31 ~1–30 MHz Excellent for choking common-mode on HF; good broadband behavior Best…
How to Choose the Right Balun: 4:1 vs 9:1 vs 49:1 Explained
Baluns and ununs are often treated as interchangeable “black boxes,” but selecting the correct impedance transformation ratio is critical for efficiency, bandwidth, and feedline behavior. Choosing incorrectly can…