Alpha Antenna base HF OCF Dipole system

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Overview - This base version of our OCF (off-center fed) Dipole Antenna available in either 6-40 or 10-80 meters and is uniquely built upon a newly designed balun, which is based upon the dual core 4:1 Guanella balun.

Shipping May 14, 2018.

Introduction - The Alpha Antenna 6-40 or 10-80 meter base OCF (Off Center Fed) Dipole is respectively 67 foot or 136 feet long and handles 200W PEP SSB. Both wire elements of each antenna come with wiring that is slightly longer so you can fine tune it.

Operation - The 6-40 meter version is a 67 foot long 200W PEP SSB antenna is designed for the 6, 10, 20, and 40 meter bands without a tuner. You may also need to use an external antenna tuner if your antenna is too low or not placed in an area clear of metal structures.

The 10-80 meter version is a 136 foot long 200W PEP SSB antenna is designed for the 10, 20, 40, and 80 meter bands without a tuner. You may also need to use an external antenna tuner if your antenna is too low or not placed in an area free of metal structures.

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User Guide:
User Guide

Deployment - This antenna includes the ability to adjust tuning for differing heights and surroundings, which is done by simply trimming the included extra wire from the elements. This antenna can be installed in an inverted V configuration, which changes the feedpoint impedance. It can also be deployed at the ideal height where the feed point is around 30-35 feet. Mounting the OCF antenna between 20 to 30 feet is also acceptable. Lower heights can also be used to maximize NVIS (Near Vertical Incident Skywave), which is most effectively enabled by using a tuner on some of the bands that each antenna is designed to operate on.

Technical - The OCF Alpha Match is a newly designed balun, which is based upon the dual core 4:1 Guanella balun that delivers 200 ohm impedance characteristics to radiating wire elements, while inherently minimizing common mode current. This design enables the antenna to be fed with a standard 50 ohm coax. This is not an OCF design that uses a vertical coaxial radiator and needs some type of choking resistance ("choke balun").

Analysis at 6 feet.

Higher installs drops SWR & increases performance!
Alpha Antenna OCF Dipole SWR analysis

Alpha Antenna OCF Dipole Smith Chart

OCF Alpha Match results on a 200 ohm load

SWR Analysis with Balun under 200 ohm load

R, X, & Z Analysis with Balun under 200 ohm load

Smith Chart under 200 ohm load

This product will be in stock on Monday 14 May, 2018.

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