12.5 Ohms unbalanced to 50 Ohms unbalanced
This unbalanced design is excellent for matching antennas such as inverted L's, short vertical wires and other low feedpoint impedance designs. Windings for this model feature custom hand made low impedance coax to provide high power capability.
Unlike Baluns, Unun's (unbalanced to unbalanced) provide impedance transformation for antennas that are naturally unbalanced because of their configuration. Even though many unun's appear small in size, they are able to handle very high power (matched/resonant condition) because of their excellent efficiency. It should be noted that the winding design of ununs provide little to NO common mode or RF choking impedance.
Many other unun ratios are available by contacting us via the methods shown under the About Us tab.
This is a specialty wind and due to the custom nature of this unit, is not eligible for exchange or return unless there is a defect in materials or workmanship.
|Core Material|| Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
Core is coated and sealed for long term durability.
|Winding Type|| Individual core wound with coax configured as a 1:4 unun.
|Winding Material||Custom hand made low impedance coaxial cable.|
|Power Rating|| 5kW into resonant load of 12.5 ohms
|Useable Frequency||1 - 31 MHz|
|Insertion Loss||Less than 0.1db|
|Connectors|| SO-239 connectors are gold center conductor with Teflon insulation.
Studs and eyebolts are 1/4 inch.
Alternate connectors and Mounting Options are available in the Accessories section.
|Hardware||All Stainless Steel|
|Enclosure Type|| NEMA rated 4x marine grade junction box for outdoor installations.
Cover utilizes integral neoprene gasket for weatherproof integrity.
|Dimensions|| 4x4x2 inches for main body of unit
Dimensional Drawing of Standard Enclosure
|Additional Info||Very high efficiency (98-99%)|