6-160 Meter Alpha OCF Dipole Antenna options

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OCF Dipole options

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Overview - This is the Alpha Antenna 6-40 Meter OCF (off-center fed) Dipole.

Very popular! So there’s a bit of a back log.
Next production run will be ready to ship 4/16/2018.
Pre-order now to be at the front of the line.

Introduction - Our engineers are proud to bring you a portable antenna in a revolutionary housing that is both beautiful and functional.

Operation - This 67 foot (44.5x22.5) long 200W PEP SSB antenna is designed for the 6, 10, 20, and 40 meter bands without a tuner. This is not an OCF design that uses a vertical coaxial radiator and needs some type of choking resistance ("choke balun"). You may also need to use an external antenna tuner if your antenna is installed over a poor ground or not placed in a clear area.

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. (Note - The 6-40M OCF SWR antenna analysis below was taken at a height of six feet, to show the worst SWR readings you should expect. Mounting the 6-40M OCF SWR antenna between 20 to 40 feet is acceptable and will result in lower SWR readings.

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.

6-40M OCF antenna analysis at 6 feet

6-40M OCF SWR antenna analysis

6-40M OCF 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


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