HF Impedance Transformer Kits

1032773009 - HF Impedance Transformer Kits
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50:300 (6:1) CUBE™ Balun, 1-61 MHz, 1.5/3KW (choose top stud/eyebolt/power rating)

Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/Off Center Fed Dipole Transformers
SKU CB-6-1500TS
$109.95
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50:300 (6:1) CUBE™ Balun, 1-61 MHz, 1.5/3KW (choose top stud/eyebolt/power rating)
Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/Off Center Fed Dipole Transformers
Product Details
MPN: CB-6-1500,CB-6-3000
Input ohms/Output ohms: 50 in, 300 out
Frequency Range < 2:1 SWR (MHz): 1-61
PEP Power Rating (watts): 1500/3000
Weight (pounds): 1500=2#, 3000=4 #

1500/3000 Watt 6:1 CUBE Balun™ – Model CB-6-1500/3000

Model CB-6-1500/3000 is a 6:1 (300:50) balun housed in a NEMA enclosure box (1.5KW in 4″ x 4″ x 2″, 3KW in 6" x 6" x 4") with two top studs capable of input power levels up to 1.5KW PEP watts when used with a matched load. The 6:1 ratio takes 50 ohms input and matches to 300 ohms balanced output from 1-61 MHz with SWR < 1.5:1 under matched load conditions. A great balun for windoms, OCF antennas >60 feet over ground, Hertz and folded dipole antennas, T2FD etc. 8 core, Use “EB” version with side eye bolts for wire attachments for OCF dipole use.

Typical SWR and impedance transformation from 1-61 MHZ shown below:

CB 6 1500 Graph png - HF Impedance Transformer Kits

This transformer requires a feed line choke to isolate the coax feed line from the antenna. A coax noise filter is also recommended.

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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.