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Open Sleeve Dipole, Tribander Plus

Tribander Plus? Plus what? Friends with benefits maybe?

Back in 2002 or so, references to the “open sleeve dipole” sparked a curiosity in the topic. Very few web references were available back then(in the internet dark ages). The article that initially tweaked the curiosity was N6LF’s article “A Wideband 80-m Dipole”, which built upon an earlier article by K9AY from 1995. The open sleeve idea is also mentioned by Bill Orr, W6SAI. Current ARRL Antenna books have information on this topic in Chapter 10, but that was not available in 2002. Not much else, but there are a few engineering references going back at least as far as 1945. None of which were readily available a decade ago. Time marches…..

Recently Joel Hallas, W1ZR, ran a couple of articles on the subject in QST. This article on adding 6m to a tribander duplicated an idea I had myself, although I was more interested in the possibility of easily adding 17m to a tribander. W1ZR uses the term favored by K9AY, the “coupled-resonator”, from K9AY’s article “The Coupled-Resonator Principle: A Flexible Method for Multiband Antennas” in the ARRL Antenna Compendium #5. K9AY’s “coupled-resonator” terminology is more precise and accurate as a general description of the principle for amateur uses. Yet my own fuzzy gray matter remains wed to the term “open-sleeve”, which is really an example of the general principle in a narrow usage.

More references are available today: NQ6K with a well written treatment used as a sloper, and DK7ZB […]

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