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®

1725513179 - HF High Power Impedance Transformers

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.

Installation Tips

Choose a transformer rated for your maximum PEP output.
Mount with the enclosure drain-hole down for outdoor use.
For extra RFI suppression, add a feed-line choke near the station.

Need help choosing? See our Mastering Coax Feed Line Chokes, Baluns, and Ununsor contact sales@palomar-engineers.com.

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Choke and Transformer (Balun/Unun) Power Rating and Derating Guide - FREE DOWNLOAD

SKU FDL-POWER

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The high power ferrite impedance transformer series (> 1:1), configured with outputs to act as a baluns (unbalanced coax in to balanced load output) or as ununs (unbalanced coax input to unbalanced load output) are designed for demanding radio transmitter stations that run over 1,000 watts PEP or run continuous modes like AM, digital, RTTY, FM, etc. at high power levels. Radio contest operators, commercial shortwave broadcast, and industrial and commercial stations use these transformers for for a variety of balanced and unbalanced antenna loads. Baluns are typically used for balanced loads and antennas like dipoles, loops, log periodics, and direct feed yagi/beams. Ununs are used with verticals, end fed wires, horizontal dipoles, G5RV/ZS6BKW, Zepps, vertical wire beams, etc). All products are in an enclosed NEMA water resistant box with SO-239 input connector and stainless steel side/top studs with wing nuts or side and top eyebolts. The enclosure box has mounting “side feet” for attachment to a post or antenna boom using nylon ties.