22/25 ohms unbalanced to 50 Ohms unbalanced
Unlike Baluns, Unun's (unbalanced to unbalanced) provide impedance transformation for antennas that are naturally unbalanced because of their design configuration. Even though the unun's appear small is size, they are able to handle very high power (2kW continuous - matched condition) because of their excellent efficiency. This unit can be built to either 22 or 25 ohms so please make sure you select the value required when ordering. It should be noted that the manner in which ununs must be wound provides NO common mode or RF choking impedance.
This unit is excellent for matching antennas such as inverted L's and other unbalanced antennas with low feedpoint impedance. This is the low power version of the model 1235t but still fully capable of handling 2kW.
Other unun ratios are available by contacting us via the methods shown in the About Us section.
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 trifilar set configured as 1:2 unun.
|Winding Material|| 14 gauge Superior Essex Heavy build polyamideimide Allex 240 Winding Wire.
Windings are inserted into Teflon tubes increasing total breakdown to 10,000 volts.
|Power Rating||1.5 to 35 MHz - 2kW|
|Useable Frequency||1.5 to 35 MHz|
|Insertion Loss||Less than .02db|
|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%)|