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.