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Roy Lewallen wrote:
Sal M. Onella wrote: Arnie Coro's website does discuss the item described. http://www.mail-archive.com/hard-cor.../msg18595.html He doesn't claim it works well (nor should he). At one point he describes burying it to stealth it. When I was moving an antenna, I had both dipole elements laying on the ground but still connected. Just for laughs, I tuned it up. I could hear a few other people but nobody could hear me. I think burying an HF antenna should be followed by a shopping trip for some writing paper and stamps. You'll need 'em. Buried antennas were seriously investigated by the military some time ago, and are probably still in use. While terribly inefficient, some can radiate enough to be useful, and invisibility can be an asset. I was told long ago that the reason NEC-4 was prohibited for export for so long was that it could be used for designing buried and therefore invisible antennas. Actually, I think it was the NEC 3 variant that first introduced buried wires, and was classified as Defense Critical Technology. "The only difference in the capabilities of these codes is that NEC-3 can model wires that are buried or penetrate from air into the ground, while NEC-2 is limited to antennas in free space or above a ground plane." from Burke's NEC validation paper published at that conference in Ankara Turkey in 1989. That paper also mentions an experimental version NEC3VLF (improving performance for electrically small antennas), NEC4X (better modeling of endcaps), NEC3I (for insulated wires), NEC-GS (ground screens), etc., all of which probably wound up in NEC4 in one way or another. A notable export controlled application of such codes is modeling wires submerged in seawater. The export controls still exist, by the way, for NEC4.. when you get a copy, don't you have to certify who the end user is? and agree to ITAR compliance, etc. https://ipo.llnl.gov/technology/soft...uments/NEC.pdf Roy Lewallen, W7EL |
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