Dual Core 4:1 Current Balun 5kW 1 - 54MHz #4115
|Manufacturer: Balun Designs|
This is a balun originally designed by Guanella and subsequently improved by Dr. Jerry Sevick (W2FMI). By utilizing Thermaleze wire inserted in teflon tubes, Dr. Sevick was able to substantially increase the breakdown voltage between both conductors and windings while maintaining the required 100 ohm characteristic impedance. The dual cores also provide excellent choking impedance and feedline isolation. Consequently, this balun is a good choice if you have RFI problems or RF in your shack due to imbalanced ladder line.
All testing done with an AIM-4170c Network Analyzer and precision 200 ohm load
If one or both legs of your antenna will be installed over or close to (< 20 feet) your house, a large structure (garage, barn, etc) or near (< 30 feet) a metal roof/structure and you will run 700+ watts, DO NOT use this 4115 balun. The interaction/coupling of the antenna with the structure and or metal will create excessive flux in one core and subsequent damage to the balun. Instead use the Model 4114 which utilizes a single stacked core designed to handle the imbalance caused by any interaction or coupling.
| 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
|| Individual cores wound with single wire pair as 1:1 current balun.
Cores are then cross connected to create 4:1 current balun.
| Winding Material
|| Bifilar windings of 14 gauge Heavy build polyamideimide Allex 240 Winding Wire.
Windings are inserted into Teflon tubes increasing total breakdown to 10,000 volts.
| Power Rating
|| 1 to 35 MHz - 5kW, 7kW intermittent. 35 to 54 MHz - 4kW.
All ratings based on resonant load. High SWR will reduce power handling ability.
|Useable Frequency|| 1 to 54 MHz
| Insertion Loss
|| Less than .02db
|| SO-239 connectors are silver plated with Teflon insulation.
Studs and eyebolts are 1/4 inch.
Alternate connectors and Mounting Options are available in the Accessories section.
||All Stainless Steel|
| Enclosure Type
|| NEMA rated 4x marine grade junction box for outdoor installations.
Cover utilizes integral neoprene gasket for weatherproof integrity.
|| 4x4x2 inches for main body of unit
| Additional Info
|| Very high efficiency (98-99%).