5:1 Baluns/Ununs

5:1 CUBE™ Unun – Model CU-5-1500 (50:250 Ohm, 1.8-61 MHz, 1.5KW PEP)

Application. For traveling wave, end fed or portable 20-31 foot vertical antennas the 5:1 unun makes a good transformer for converting 50 ohm coax to a 250 ohm feed point. If you use the antenna on multiple bands, the feed point impedance may not always be 250 ohms and use of the unun at high (>350 ohms) or low (<100 ohms) will require reduced power input or the unun may have its power ratings exceeded and damage to the unun may occur. The (5:1 conversion ratio will change for loads other than 250 ohms unbalanced.

Typical application:

CU 5 1500 antenna - 5:1 Baluns/Ununs

Also available as a balanced output – CB-5-1500

1725513113 - 5:1 Baluns/Ununs
+3

Hybrid 6:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5KW/5KW PEP

CB-6-1-1500
$149.95
In stock
1
Product Details
MPN: CB-6-1-1500EB or TS option, 1.5KW or 5KW option
Country/Region of Manufacture: USA
Input ohms/Output ohms: 50 in/100 out
Frequency Range < 2:1 SWR (MHz): 1.8-61 MHz
PEP Power Rating (watts): 1.5KW/5KW
Enclosure Size: 4"x4"x 2"(1.5KW), (6"x6"x4" 5KW)
Weight (pounds): 3 or 5 # for 5KW
Antenna Compatability: Off Center Fed


The CB-6-1-1500 is a CUBE(TM) enclosure containing a multi-core, broadband 6:1 impedance transformer (50 ohm coax input to 300 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-6-1-1500EB 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. Top eye bolt acts as an antenna hoist. Also available with top studs for post or wall mounting (Model # CB-6-1-1500TS). CB-6-5000EB or TS is housed in a 6" x 6" x 4" water proof enclosure.

Balun is often used for OCF antennas installed at higher distances over ground


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