2:1 Baluns/Ununs

Hybrid 1.5:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop Antenna

CB-1.5-1-1500EB
$139.95
In stock
1
Product Details
MPN: CB-1.5-1-1500/5000EB or TS option
Country/Region of Manufacture: USA
Input ohms/Output ohms: 50 in/75 out
Frequency Range < 2:1 SWR (MHz): 1.8-61 MHz
PEP Power Rating (watts): 1.5KW or 5KW
Enclosure Size: 4"x4"x 2"(1.5KW), 6"x6"x4" (5KW)
Weight (pounds): 3 (1.5KW), 5 (5KW)
Antenna Compatability: Single Band Loop

After many requests we have created a compact, special balun for single band loop (Sky loop or Delta loop) antennas with specific dimension that present a feedpoint of 70-75 ohms. The CB-1.5-1-1500/5000 is a CUBE(TM) enclosure containing a multi-core, broadband 1.5:1 impedance transformer (50 ohm coax input to 75 ohm balanced output) in series with a 1:1 current balun for extra common mode current choking to keep RF current off the outside of the coax braid and on the antenna where it belongs. The extra choking action also means that the coax feed line will not act as a radiator causing unnecessary RF interference (RFI). Rated for full 1500 watts PEP and 450 watts CW (ICAS). 1.8Mhz – 61 MHz.

CB-1.5-1-1500/5000EB is housed in a 4” x 4” x 2” waterproof housing with SO-239 input and stainless steel eye bolts on the side for ease of connection to your wire antenna (or top studs as desired). Top eye bolt acts as an antenna hoist. Also available with top studs for post or wall mounting (Model # CB-2-1-1500/5000TS)

Loop antennas should be cut for 1005/F(MHz) in total length, where F (MHz) is the lowest frequency to be used. For 3.5MHz this equates to 288 foot perimeter (square, delta, multi-side ok). Vertiucal loops with pointy side up and longer bases and fed 1/4 wavelength down one side have a feedpoint impedance near 75 ohms for which this balun is well suited. A very good DX antenna!

For unbalanced 50 ohm input to unbalanced 75 ohm output use the CU-1.5-1500 or CU-1.5-5000.

Display Note: Product picture is 2:1 balun, 1:1 Unun but actual delivered product is CB/CU-1.5-1-1500/5000 as selected.

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2:1 (100:50) Baluns are useful between 50 ohm coax and 100 ohm balanced lines for loops, cubical quads, log periodics and other antennas where the impedance at the end of the feedline is 100 ohms (1/2 wavelength feedline).