HF Impedance Transformer Kits

50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KW

SKU CB-2.25-1500TS
$109.95
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Output Connector
Power rating (PEP)
Input Connector
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50:112 (2.25:1) CUBE™ Balun 3-30 MHz, 1.5KW/3KW/5KW
Product Details
Country/Region of Manufacture: USA
Type: BALUN
Input ohms/Output ohms: 50
Frequency Range < 2:1 SWR (MHz): 3-30
PEP Power Rating (watts): 1500/3000/5000
Enclosure Size: 4" x 4" x 2" (1.5KW), 4" x 4" x 4" (3KW/5KW)
Weight (pounds): 3
Antenna Compatability: loops, quads, 112 ohm input antennas

High Power rated at 1.5KW/3KW/5KW (option) PEP (FT8 mode at 1.5KW)

Broad frequency range of 3-30 MHz for < 2:1 SWR into matched load

Compact 4" x 4" x 2" (1.5KW) or 4" x 4" x 4" (3KW/5KW) light weight weatherproof enclosure

Quick, easy deployment with either halyard hoist and side eyebolts or to stud outputs (all 1/4" stainless hardware)

Choice of BALUN (balanced outputs) or UNUN (unbalanced output and ground)

Model CB-2.25-1500, 3000, 5000 is a 2.25:1 (112:50 ohm) multi-core balun used to translate a 50 ohm input to 112 ohms at RF power levels up to 5000 watts PEP when used with a matched load such as single band delta loop, quad or loop skywire. This assembled balun features a multi-core configuration for increased power handling and flatter frequency response to over 30 MHz. With a matched 112 ohm load the SWR over the frequency range is very consistent from 3-30 MHz and SWR is less than 2:1 over the range allowing easy tuning by most radio internal antenna tuners or an external tuner.

These impedance transformer kits have been designed for the Do-It-Yourself (DIY) enthusiast and Instructor workshops on baluns and ununs for antenna matching and RFI use.

The impedance transformers are classified in ratios of 2:1 (100:50 ohm) to 16:1 (800:50 ohm).  The outputs can be configured as balanced (Balun) or as unbalanced (unun) with respect to the inputs which are considered all unbalanced coax at 50 ohms.  All impedance transformers are designed for 1.8-31 MHz unless otherwise specified.