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On Mon, 10 Oct 2005 11:33:48 +0000 (UTC), "Reg Edwards"
wrote: .... At higher frequencies there's usually enough space to erect a dipole or an inverted-L which will perform at least as well. (Ian, you could perhaps do a useful article on the subject.) .... I wrote an article on the Inverted L with a remote autotuner (designed for end-fed wires) some time ago. The configuration, it is frequency agile, very convenient when integrated with transeiver auto-tune controls, and works a treat. The most significant downside (like most Marconi, Windom, Long Wire etc configs) is from an EMR safety point of view, it has a radiator within reach of people standing on the ground. The article is at http://www.vk1od.net/InvertedL/InvertedL.htm . With the experience of using such a configuration, I reckon that a magloop with an remote autotuner designed specifically for a magloop would be a great option for people with very little space, better than Echolink! Reg, if you have an expression for the loop inductance and resistance as a function of frequency, and we could make the assumption that the coupling coil is a broadband ideal transformer with a fixed z ratio or otherwise characterise the transformation as a function of frequency, I could do a software simulation of an autotuner... be an interesting project. BTW, the tuner values in the article above are found through simulation of an automated L tuner, but the 3 variable binary searching algorithm used for performance would not work for a loop. Owen -- |
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