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| Subject: | LF: 8.97kHz antennas |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Tue, 16 Mar 2010 13:59:29 +0000 |
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Getting a Marconi vertical up in the sky is no mean task when 100m long and carrying a decent antenna current so I was wondering whether there is any merit in using grounded electrode pairs (as used for through-the-ground "earth mode" conduction tests) possibly fed with elevated feed wires as an alternative? Not being much of a theory man I've little idea how this would perform and what amount of the 8.97kHz energy injected into the loop thus formed would actually be radiated. Clearly stringing out a 200m long grounded electrode pair "antenna" in a big field would be considerably easier than raising a kite mounted vertical. This arrangement on a much larger scalle was used at 76Hz for Project Sanguine (to radiate a signal to submarines, deeply submerged) and papers I've read on "earth mode" caution that for military applications the through-ground path may not be secure because of the amount of energy radiated. I also recall that G0AKN used this arrangement with some success on 73kHz. Anyone know the answer? 73s Roger G3XBM -- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 |
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