CUBE Impedance Transformers (<1:1, 1:1, >1:1)

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CUBE™ Impedance Transformers

Match your antenna with precision — wide-range baluns & ununs from Palomar Engineers®

Overview

The CUBE™ series impedance transformers from Palomar Engineers® provide reliable broadband matching between 50 Ω feed lines and a variety of antenna loads. Ratios from 1:1 to 16:1 cover dipoles, loops, ladder-line systems, off center fed, end-fed, BBTD and TTFD antennas.

Each transformer features stainless-steel hardware, weather-resistant NEMA enclosures, and heavy-duty windings for continuous HF operation (up to 5 kW PEP, model-dependent). Built and tested in the USA — continuing Palomar’s 65-year tradition of RF excellence.

Why Matching Matters

Reduces SWR and maximizes RF transfer efficiency.
Prevents unwanted common-mode currents and RFI on feed lines.
Improves tuner performance and overall station reliability.

Quick-Selection Guide

Choose the right transformer ratio based on your antenna type or impedance range.

Antenna Type / Scenario	Typical Load (Ω)	Matching Ratio (Output:Input)	Suggested CUBE™ Model	Notes
Standard 50 Ω Dipole	≈ 50-75	1:1	CUBE™ 1:1 Balun	Ideal for balanced antennas — basic isolation.
Multi-Band Full Wave Loop or Off Center Fed Dipole (200 Ω)	≈ 200	4:1+1:1	CUBE™ 4:1 Balun + 1:1 Choke Hybrid	Use for 200 Ω balanced feed to 50 Ω coax and suppress common mode current on coax
Ladder-Line Fed Windom (450 Ω)	≈ 450	9:1	CUBE™ 9:1 Balun	For higher-Z ladder-line loads.
End-Fed Non-Resonant Long Wire Antenna	≈ 400-500	9:1	CUBE™ 9:1 Unun	Classic end-fed matching — wideband HF coverage.
End Fed Resonant Antenna (~200 Ω)	≈ 200	4:1	CUBE™ 4:1 Unun	Raises low impedance to match 50 Ω feed line.
BBTD, T2FD (450 or 1000 Ω) Balanced	100–112	9:1+1:1 or 16:1+1:1 Hybrid	CUBE™ 9:1+1:1 or 16:1+1"1 Balun	For custom feed systems and high SWR margins.