You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Turbo T, you can use copper wire, but supporting the wire can be an issue. You can also use conduit, copper, or aluminum, but to some degree the diameter of the material will control the resonance, albeit this antenna should show a very wide bandwidth. The problem with using horizontal radials on a 1/4 wavelength radiator is the match will not be very good showing very low resistance and a high SWR. If you angle the radials down to 40* degrees or less you will get a much better match.

Here is a model of the idea you have in mind. The pattern is not too bad, but check out the last page, the "Source Data" and you will see the resistance will likely be very close to 18 ohms at the feed point, showing about 2.8:1 SWR and that is not too good. This model is at 32' feet high with a mast attached, and if you change the height the match will also change a bit.

[ATTACH]5079[/ATTACH]

<blockquote data-quote="Marconi" data-source="post: 297246" data-attributes="member: 903">Turbo T, you can use copper wire, but supporting the wire can be an issue. You can also use conduit, copper, or aluminum, but to some degree the diameter of the material will control the resonance, albeit this antenna should show a very wide bandwidth. The problem with using horizontal radials on a 1/4 wavelength radiator is the match will not be very good showing very low resistance and a high SWR. If you angle the radials down to 40* degrees or less you will get a much better match.&nbsp;Here is a model of the idea you have in mind. The pattern is not too bad, but check out the last page, the &quot;Source Data&quot; and you will see the resistance will likely be very close to 18 ohms at the feed point, showing about 2.8:1 SWR and that is not too good. This model is at 32&#039; feet high with a mast attached, and if you change the height the match will also change a bit.&nbsp;[ATTACH]5079[/ATTACH]</blockquote>

[QUOTE="Marconi, post: 297246, member: 903"] Turbo T, you can use copper wire, but supporting the wire can be an issue. You can also use conduit, copper, or aluminum, but to some degree the diameter of the material will control the resonance, albeit this antenna should show a very wide bandwidth. The problem with using horizontal radials on a 1/4 wavelength radiator is the match will not be very good showing very low resistance and a high SWR. If you angle the radials down to 40* degrees or less you will get a much better match. Here is a model of the idea you have in mind. The pattern is not too bad, but check out the last page, the "Source Data" and you will see the resistance will likely be very close to 18 ohms at the feed point, showing about 2.8:1 SWR and that is not too good. This model is at 32' feet high with a mast attached, and if you change the height the match will also change a bit. [ATTACH]5079.vB[/ATTACH] [/QUOTE]

Top Bottom