Excellent broadband balun that can be used anywhere there is a need to transform 75 ohms balanced to 50 ohms unbalanced. Its most common use is at the feedpoint of monoband dipoles that have an impedance of 72-75 ohms. This is a two stage unit with a 75 ohm 1:1 current balun wound on the large toroid to generate high levels of RF choking impedance and conversion of the signal from balanced to unbalanced . The output of the balun is then fed into a 1.5:1 unun for impedance reduction to a 50 ohm unbalanced feedline.
|Core Material|| Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth.
Cores are coated and sealed for long term durability.
|Winding Type|| Two separate windings. Large toroid is 1:1 balun designed at 75 ohms impedance.
Winding is 14 gauge Thermaleze wire inserted in teflon tubes.
Small core is trifilar wind of thermaleze wire creating a 1.5:1 Unun providing the impedance
transformation from 75 ohms to 50 ohms unbalanced.
|Winding Material|| Essex heavy build polyamideimide Allex 240 Winding Wire
Standard wall Teflon tubing.
|Power Rating|| 1.5 to 35 MHz - 3kW
All ratings based on resonant load. High SWR will reduce power handling ability.
|Useable Frequency||1.5 to 31 MHz|
|Insertion Loss||Less than .03 db|
|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.
Will not heat up or saturate at like many of the "less expensive" designs.