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Gold Prospecting
Do It Yourself (DIY) Projects
HF radio antenna - DIY
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<blockquote data-quote="Greenhornet_au" data-source="post: 617230" data-attributes="member: 8767"><p>Okay.. Mr. BigL</p><p></p><p>So a full wave at 27mhz is @11m, half wave is 5.5m, therefore a half wave Dipole 27mhz is 5.5m per side of the feed in point (center). Total of 11m ?</p><p></p><p>Clearly this is a 'wide antenna' and would need to hang horizontally, if there were no very tall trees around to hang it vertically at least "a half wave length" off of the ground, or would that be a full wave length in this case ?</p><p></p><p>If horizontal I assume it best be as high as possible?</p><p>.</p><p>.</p><p>LOL, I can see my girls having fun with their slingshot...err, BAIT throwers (fishing rods at hand) <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p>Lobbing sinkers with cord attached.</p><p>.</p><p>.</p><p>The UHF, 1/4 wave, I'm all good with that.</p><p>I assume that the 'driven' element is best to have something with a low resistance, like copper or brass.</p><p></p><p>That is a nice page.</p><p><a href="https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/" target="_blank">https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/</a></p><p></p><p> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Greenhornet_au, post: 617230, member: 8767"] Okay.. Mr. BigL So a full wave at 27mhz is @11m, half wave is 5.5m, therefore a half wave Dipole 27mhz is 5.5m per side of the feed in point (center). Total of 11m ? Clearly this is a 'wide antenna' and would need to hang horizontally, if there were no very tall trees around to hang it vertically at least "a half wave length" off of the ground, or would that be a full wave length in this case ? If horizontal I assume it best be as high as possible? . . LOL, I can see my girls having fun with their slingshot...err, BAIT throwers (fishing rods at hand) ;) Lobbing sinkers with cord attached. . . The UHF, 1/4 wave, I'm all good with that. I assume that the 'driven' element is best to have something with a low resistance, like copper or brass. That is a nice page. [url]https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/[/url] :) [/QUOTE]
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Gold Prospecting
Do It Yourself (DIY) Projects
HF radio antenna - DIY
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