25 June, 2019

A Moxon for 6 meter

My new 6 m antenna is in the Norwegian ham radio magazine Amatørradio this month and the two first pages are shown below. The title is "A Moxon summer antenna for 6 meter". A very short version is here.

The antenna builds on the design of L. B. Cebik, W4RNL in QST June 2000 - "Having a Field Day with the Moxon Rectangle". That design can be found in the moxgen program which may be downloaded from AC6LA. My design frequency was 50.2 MHz - in order to cover the CW band and FT8 at 50.313 MHz.

The design with crossed glassfiber rods was inspired by that of Anthony Good, K3NG - "Homebrew Lightweight 6 Meter Moxon".

A Moxon is a special form of a two-element Yagi-Uda antenna with the elements bent towards each other making it only 2/3 the width. This is a two-element end-fire antenna where the Forward/Backward-ratio is near maximal, thus the Maximum gain suffers a little compared to a design optimized for gain. Another two-element array is a directional microphone. For instance a hypercardioid design has optimal gain, while a supercardioid has the best F/B-ratio. See lecture notes here from the University of Oslo for more details about this analogy.

This blog post first appeared on the LA3ZA Radio & Electronics Blog.

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