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#1
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EZNEC model of sleeve antenna
Thank you to whoever provided the coordinates for the model of this antenna.
I wrote them down and entered them when I saw them in your posting but the original email has been automatically removed from the folder in my email client. There has been a lot of discussion and side issues raised from my original post but I am grateful for you taking the time to provide the information for me. I am a novice with regard to antenna theory and have no previous experience with antenna modeling. Your post has given me a good starting point. I entered the coordinates and (beside initially selecting wavelengths instead of inches) the model ran fine. I was then able to scale it up to the frequency of interest (920 MHz) and now I am playing with the sleeve diameter, sleeve length and radiator length to observe how these are effecting radiation pattern and SWR. There was also mention of a book regarding basic antenna modeling, my next step will be to purchase a good book to help me understand the process and limitations etc. Thanks again Regards David Huisman |
#2
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On Tue, 11 Oct 2005 23:15:51 GMT, David wrote:
I was then able to scale it up to the frequency of interest (920 MHz) and now I am playing with the sleeve diameter, sleeve length and radiator length to observe how these are effecting radiation pattern and SWR. Hi David, Also take care to scale the conductor size too. At your intended frequency, and to achieve parity with the 100MHz results, this is very much demanded. 73's Richard Clark, KB7QHC |
#3
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"David" wrote in message
... Thank you to whoever provided the coordinates for the model of this antenna. I wrote them down and entered them when I saw them in your posting but the original email has been automatically removed from the folder in my email client. There has been a lot of discussion and side issues raised from my original post but I am grateful for you taking the time to provide the information for me. I am a novice with regard to antenna theory and have no previous experience with antenna modeling. Your post has given me a good starting point. I entered the coordinates and (beside initially selecting wavelengths instead of inches) the model ran fine. I was then able to scale it up to the frequency of interest (920 MHz) and now I am playing with the sleeve diameter, sleeve length and radiator length to observe how these are effecting radiation pattern and SWR. There was also mention of a book regarding basic antenna modeling, my next step will be to purchase a good book to help me understand the process and limitations etc. Thanks again Regards David Huisman I recommend Cebik's book from www.nittany-scientific.com. The ARRL modeling course is probably similar, since Cebik was also involved in its development. Regards, Frank |
#4
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On Wed, 12 Oct 2005 13:35:55 GMT, "Frank"
wrote: I recommend Cebik's book from www.nittany-scientific.com. The ARRL modeling course is probably similar, since Cebik was also involved in its development. I have both. In my opinion, the ARRL's modeling course book would a better choice for those starting out in modeling. That isn't meant that is limited. Anyone who finishes the course should have an excellent understand of modeling and able to knowledgeably make complex models using programs such as EZNEC or NecWinPlus+. Nittany's book would be a better choice for those who prefer using NEC card input formats. 73, Danny, K6MHE |
#5
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Dan Richardson wrote in message
... On Wed, 12 Oct 2005 13:35:55 GMT, "Frank" wrote: I recommend Cebik's book from www.nittany-scientific.com. The ARRL modeling course is probably similar, since Cebik was also involved in its development. I have both. In my opinion, the ARRL's modeling course book would a better choice for those starting out in modeling. That isn't meant that is limited. Anyone who finishes the course should have an excellent understand of modeling and able to knowledgeably make complex models using programs such as EZNEC or NecWinPlus+. Nittany's book would be a better choice for those who prefer using NEC card input formats. 73, Danny, K6MHE Good point. I should have mentioned that the book deals almost exclusively with NEC card input formats. 73, Frank |
#6
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EZNEC model of sleeve antenna
Sorry I missed this -- I've been out of the country and generally unable
to access the newsgroups. But it looks like it got resolved satisfactorily. Anyone with a specific question about EZNEC modeling is welcome and encouraged to contact me directly (after making an honest effort at finding the answer in the manual, of course). Roy Lewallen, W7EL |
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