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#1
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Gaussian antenna planar form
Since in the past I noted that amateurs
preffered their antennas to be planar I thought I would force Gaussian elements to be constructed some what in line like a yagi but ofcourse spacings will go where ever they want to attain over all equilibrium. The results are as follows when striving for maximum gain. ( 14.25 Mhz) # el boom lth inches gain dbi 2 125 12.85 3 454 14.96 4 460 14.85 5 451 14.98 6 448 14.89 7 440 15.18 8 441 15.20 9 434 15.18 10 434 15.13 A gaussian has a natural good reasonable front to back so I left that out of the equation. The above did not show any variation in band width ie it stayed around 65 degrees so there is no focussing effect around which a yagi is designed As can be seen from the above, after you get a length of approx 34 feet no amount of extra elements added is going to provide more gain or change in radiated pattern and this pattern will be achieved with as little as 3 elements. A normal gaussian normally moves to a cubical volume similar to a stacked arrangement while still only requiring a single feed point so later I will take a look at that. From the above one can see that approx 15 dbi is the most that can be expected from a forced inline array with the pattern of radiation staying constant showing that max efficiency has been reached. I will leave it to others to give their take on the above listing. Art |
#2
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Gaussian antenna planar form
On 1 Jun, 08:03, art wrote:
Since in the past I noted that amateurs preffered their antennas to be planar I thought I would force Gaussian elements to be constructed some what in line like a yagi but ofcourse spacings will go where ever they want to attain over all equilibrium. The results are as follows when striving for maximum gain. ( 14.25 Mhz) # el boom lth inches gain dbi 2 125 12.85 3 454 14.96 4 460 14.85 5 451 14.98 6 448 14.89 7 440 15.18 8 441 15.20 9 434 15.18 10 434 15.13 A gaussian has a natural good reasonable front to back so I left that out of the equation. The above did not show any variation in band width ie it stayed around 65 degrees so there is no focussing effect around which a yagi is designed As can be seen from the above, after you get a length of approx 34 feet no amount of extra elements added is going to provide more gain or change in radiated pattern and this pattern will be achieved with as little as 3 elements. A normal gaussian normally moves to a cubical volume similar to a stacked arrangement while still only requiring a single feed point so later I will take a look at that.From the above one can see that approx 15 dbi is the most that can be expected from a forced inline array with the pattern of radiation staying constant showing that max efficiency has been reached. I will leave it to others to give their take on the above listing. Art Note I used the term BAND width above here I meant to say BEAM width. Consequential bandwidth changes were not noted to minimise variables. Art |
#3
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Gaussian antenna planar form
On Fri, 01 Jun 2007 08:03:09 -0700, art wrote:
From the above one can see that approx 15 dbi is the most that can be expected from a forced inline array with the pattern of radiation staying constant showing that max efficiency has been reached. I will leave it to others to give their take on the above listing. Hi Art, With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Why does a gaussian array need 10 elements to get less? 73's Richard Clark, KB7QHC |
#4
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Gaussian antenna planar form
On Fri, 01 Jun 2007 09:04:21 -0700, Richard Clark
wrote: With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Add another minute, and I could raise it to: 15.23 dBi no, no, another 15 seconds to get: 15.47 dBi Do 10 element gaussian arrays have poor efficiency? 73's Richard Clark, KB7QHC |
#5
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Gaussian antenna planar form
On 1 Jun, 09:15, Richard Clark wrote:
On Fri, 01 Jun 2007 09:04:21 -0700, Richard Clark wrote: With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Add another minute, and I could raise it to: 15.23 dBi no, no, another 15 seconds to get: 15.47 dBi Do 10 element gaussian arrays have poor efficiency? 73's Richard Clark, KB7QHC |
#6
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Gaussian antenna planar form
3 elements does sound more efficient than 10 gassians
what woud the best 10 element gain look like? On Jun 1, 10:05 am, art wrote: On 1 Jun, 09:15, Richard Clark wrote: On Fri, 01 Jun 2007 09:04:21 -0700, Richard Clark wrote: With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Add another minute, and I could raise it to: 15.23 dBi no, no, another 15 seconds to get: 15.47 dBi Do 10 element gaussian arrays have poor efficiency? 73's Richard Clark, KB7QHC- Hide quoted text - - Show quoted text - |
#7
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Gaussian antenna planar form
"Richard Clark" wrote in message ... On Fri, 01 Jun 2007 09:04:21 -0700, Richard Clark wrote: With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Add another minute, and I could raise it to: 15.23 dBi no, no, another 15 seconds to get: 15.47 dBi Do 10 element gaussian arrays have poor efficiency? 73's Richard Clark, KB7QHC Wouldnt it be nice if Art did the comparison. He could show how his gassian antenna is better than a yagi. maybe he could find a 2 element antenna his garison antenna is better than. |
#8
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Gaussian antenna planar form
Jimmy D wrote:
"Wouldn`t it be nice if Art did the comparison?" Yes. I thought a Gaussian was a 17-sided polygon. Best regards, Richard Harrison, KB5WZI |
#9
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Gaussian antenna planar form
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#10
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Gaussian antenna planar form
"Richard Clark" wrote in message ... On Fri, 01 Jun 2007 08:03:09 -0700, art wrote: From the above one can see that approx 15 dbi is the most that can be expected from a forced inline array with the pattern of radiation staying constant showing that max efficiency has been reached. I will leave it to others to give their take on the above listing. Hi Art, With 2 minutes of modeling (and using the only 3 element yagi model offered by EZNEC for FREE), I got 15.14 dBi. Why does a gaussian array need 10 elements to get less? 73's Richard Clark, KB7QHC Has there ever been a definition of a guassian array. From the best I can figure ART just claimed it otbe a bunch of random lengths mounted on a boom but every time I see a model he presents its just a mucked up yagi. Jimmie |
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