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

Thadde,
By accepted definition, a long wire antenna is one that is more than at least two wave lengths long at the design frequency. From that point everything is subject to availability.
To find the complex impedance of such an antenna (R +/- J), the easiest method is by measuring it with an instrument capable of telling you what those 'R' and 'J' are.
But that isn't what you asked, is it? So, how do you calculate those 'R' and 'J's? I'm sure that there are formulas that can do that. Unfortunately I can't tell you where to find them. Determining such formulas is done by taking measurements of existing antennas, tabulating the results, and then finding the equivalencies which would produce the same results (or nearly the same results).
That's would be a really huge amount of effort. And if someone else has already gone to that effort it makes sense to use their work instead of reproducing it! The best idea I can think of is to search the knowledge base of those who deal with this sort of thing, probably the 'IEEE', or less likely, the information published by the ARRL.
I wish I could help you, but I can't. Good luck!
- 'Doc

<blockquote data-quote="W5LZ" data-source="post: 371108" data-attributes="member: 129">Thadde,By accepted definition, a long wire antenna is one that is more than at least two wave lengths long at the design frequency.&nbsp; From that point everything is subject to availability.To find the complex impedance of such an antenna (R +/- J), the easiest method is by measuring it with an instrument capable of telling you what those &#039;R&#039; and &#039;J&#039; are.&nbsp; But that isn&#039;t what you asked, is it?&nbsp; So, how do you calculate those &#039;R&#039; and &#039;J&#039;s?&nbsp; I&#039;m sure that there are formulas that can do that.&nbsp; Unfortunately I can&#039;t tell you where to find them.&nbsp; Determining such formulas is done by taking measurements of existing antennas, tabulating the results, and then finding the equivalencies which would produce the same results (or nearly the same results).That&#039;s would be a really huge amount of effort.&nbsp; And if someone else has already gone to that effort it makes sense to use their work instead of reproducing it!&nbsp; The best idea I can think of is to search the knowledge base of those who deal with this sort of thing, probably the &#039;IEEE&#039;, or less likely, the information published by the ARRL.I wish I could help you, but I can&#039;t.&nbsp; Good luck!&nbsp;- &#039;Doc</blockquote>

[QUOTE="W5LZ, post: 371108, member: 129"] Thadde, By accepted definition, a long wire antenna is one that is more than at least two wave lengths long at the design frequency. From that point everything is subject to availability. To find the complex impedance of such an antenna (R +/- J), the easiest method is by measuring it with an instrument capable of telling you what those 'R' and 'J' are. But that isn't what you asked, is it? So, how do you calculate those 'R' and 'J's? I'm sure that there are formulas that can do that. Unfortunately I can't tell you where to find them. Determining such formulas is done by taking measurements of existing antennas, tabulating the results, and then finding the equivalencies which would produce the same results (or nearly the same results). That's would be a really huge amount of effort. And if someone else has already gone to that effort it makes sense to use their work instead of reproducing it! The best idea I can think of is to search the knowledge base of those who deal with this sort of thing, probably the 'IEEE', or less likely, the information published by the ARRL. I wish I could help you, but I can't. Good luck! - 'Doc [/QUOTE]

Top Bottom