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| To: | <[email protected]> |
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| Subject: | LF: Re: Ferrite Loops |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 16 Aug 2011 11:53:49 +0100 |
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Dear Tom, LF Group, what do you think about an array of many parallel mounted ferrite rods, each of them carrying only a few windigs, all windings connected in series (and then perhaps tuned) and the rods arraged in such a way that the individual apertures dont touch? Or will this lead to the dimensions of a comparable air loop ;-) ? I am sure this would work, but I think you have also identified the limitation ;-) Fundamentally, if the signal has a particular power density at the receive site, the antenna must intercept the signal from a certain aperture area in order to deliver a certain power to the receiver. So there is a limit to how small it can practically be, although the actual shape can vary to obtain the same aperture - one could make a rough comparison between the short, wide loop vs. the long, thin ferrite rod, and a long yagi vs. a broadside array of dipoles. I think an array of ferrite rods might be attractive in some circumstances - for instance, you could have numerous small rods stacked vertically, to produce a "ferrite rod vertical" with a small turning circle but a relatively large effective area. Cheers, Jim Moritz 73 de M0BMU |
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