12:1 Baluns/Ununs

50:600 (12:1) CUBE™ Ladder line to Coax Balun, 1.8-31 MHz, 1.5/5 KW, Top Stud, Eyebolts Option

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Product Details
MPN: CB-12-1500 (1.5KW PEP) or CB-12-5000 (5KW PEP)
Type: Current Balun
Input ohms/Output ohms: 50/600
Frequency Range < 2:1 SWR (MHz): 1.8-31
PEP Power Rating (watts): 1500/3000
Input Connector: SO239 or N
Output Connector(s): Studs or Eyebolts
Hardware Type: Stainless Steel - 1/4"

CB-12-1500/5000 in 4 x 4 x 2 inch NEMA enclosure, SO-239/N Connector input, top studs/side eyebolts

1.5KW or 3KW PEP BALUN using special multi-core ferrite topology for increased power output. Enclosure mounting feet on sides, choice of “N”(specify if needed) or SO-239 (default) input connectors

Purpose. This impedance transformer is set up as a balun (unbalanced coax to balanced 600 ohm output) and is designed to convert from coaxial cable to ladder line up to 3KW PEP from 1.8 to 31 MHz. It provides conversion from unbalanced coax to balanced ladder line and gives a 12:1 impedance step-down to reduce impedance seen by the coax, allowing the tuner to easily match the antenna.

This impedance transformer consists of multiple cores of ferrite configured as a true current balun giving well balanced currents into each output terminal over a large range and providing a 12:1 step down for 600 ohm loads. The 12:1 conversion ratios give input connector impedance of 50 ohms nominal which yield SWR’s under 2:1 easily managed by most antenna tuners.

Consider using this balun primarily where brute force, high power capability is needed over a range of output impedances such as a multi-band Zepp or rhombic ladder line fed antenna.

This product is NOT designed to be used with unbalanced outputs – use our 12:1 Unun’s for unbalanced output requirements.

For best results use a feed line choke on the coax input to suppress common mode currents.

All 12:1 baluns are custom made to order so please allow 2-3 weeks for manufacturing.

Photo Note: EB and TS products shown are labeled 1KW, but 1.5KW/5KW are in identical enclosures with appropriate labels.

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12:1 Baluns are useful between 600-650 ohm balanced loads the impedance at the  end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic,  T2FD and traveling wave antennas.

12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna.  Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.