Overview

COMTEK Jerry Sevick W2FMI Series Current Baluns

COMTEK Jerry Sevick W2FMI Series Current Baluns were inspired by the writing of Jerry Sevick, as published in his book "Understanding, Building, and Using Baluns and Ununs" also available from DX Engineering.

COMTEK baluns are value-engineered for maximum performance at a reasonable cost. They provide a superb, efficient transition between unbalanced coax and balanced antennas.

COMTEK Baluns feature:

* Jerry Sevick design with modern improvements from DX Engineering's in-depth balun research and development
* Unique high-voltage compensating capacitors for unequaled SWR bandwidth
* Outstanding ferrite-mix coated toroid core with special design to accommodate close coupling without excessive stress
* Exceptionally high and consistent common mode impedance across the specified bandwidth, which provides isolation where it is needed most
* Special wire size selection and Teflon-insulated wire sleeves provide exact impedance matching and superb insulation, unlike common Thermaleze wire
* Typical insertion loss is less than 0.2 dB
* Power handling on HF is 3 kW CW and 5 kW SSB on single core models, 5 kW CW and 7 kW SSB on dual core models
* May be used to 54 MHz with reduced ratings
* Gasketed SO-239 connectors are silver plated and have Teflon insulation
* Sealed in a weatherproof 4 in. x 4 in. x 2 in. NEMA box
* Stainless steel hardware

Note: Polarity markings on baluns are used for matching phase on balanced antennas when stacking beams for a phased array. Also, the positive terminal should be connected to a vertical element or Inverted-L and the negative terminal goes to the radials. For most regular applications on one antenna, including beams, dipoles and most wire antennas, balun polarity doesn't matter.

The best Amateur Radio baluns in the world are from DX Engineering. That includes COMTEK Jerry Sevick W2FMI Series Current Baluns!

Documentation

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