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#1
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Gain vs boom length
It is said that the gain of a Yagi-Uda is directly dependent on the boom
length. And that there is little difference between a 2 element Yagi and a 3 element Yagi. Consider a 2 element beam. What if there is no metallic boom? Does the boom length then refer to the element spacing? Then does a wider spacing between the elements mean more gain? Thanks. |
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Gain vs boom length
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#4
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Gain vs boom length
On 8/25/2019 2:56 PM, John S wrote:
On 8/25/2019 9:40 AM, Ralph Mowery wrote: In article , says... It is said that the gain of a Yagi-Uda is directly dependent on the boom length. And that there is little difference between a 2 element Yagi and a 3 element Yagi. Consider a 2 element beam. What if there is no metallic boom? Does the boom length then refer to the element spacing? Then does a wider spacing between the elements mean more gain? Thanks. There is an optimun spacing for the elements, or numberof elements per boom length. What the boom is made of makes no difference in the gain provided it is taken into account of for the length of the elements. For wider spacing equal more gain, just think of a 2 meter 2 element beam.Â* If you space the 2 elements out to 15 feet it will be almost no difference in just a simple dipole. Chruscraft made 11 element beams on a boom that was too short.Â* They had very little gain compaired to what they should have.Â* It would have been better for them to use about 6 to 8 elements. Thanks, Ralph. All you say makes perfect sense to me. So, rather than boom length we should talk about proper element spacing between elements? Oops! That was worded badly. I should have written: So, rather than boom length we should talk about proper spacing between elements? |
#5
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Gain vs boom length
On Sun, 25 Aug 2019 14:59:51 -0500, John S wrote:
On 8/25/2019 2:56 PM, John S wrote: On 8/25/2019 9:40 AM, Ralph Mowery wrote: In article , says... It is said that the gain of a Yagi-Uda is directly dependent on the boom length. And that there is little difference between a 2 element Yagi and a 3 element Yagi. Consider a 2 element beam. What if there is no metallic boom? Does the boom length then refer to the element spacing? Then does a wider spacing between the elements mean more gain? There is an optimun spacing for the elements, or numberof elements per boom length. What the boom is made of makes no difference in the gain provided it is taken into account of for the length of the elements. For wider spacing equal more gain, just think of a 2 meter 2 element beam.Â* If you space the 2 elements out to 15 feet it will be almost no difference in just a simple dipole. Chruscraft made 11 element beams on a boom that was too short.Â* They had very little gain compaired to what they should have.Â* It would have been better for them to use about 6 to 8 elements. Thanks, Ralph. All you say makes perfect sense to me. So, rather than boom length we should talk about proper element spacing between elements? Oops! That was worded badly. I should have written: So, rather than boom length we should talk about proper spacing between elements? ... _optimum_ spacing ... Web search for "eznec". 73 Jonesy -- Marvin L Jones | W3DHJ | W3DHJ | https://W3DHJ.net/ Pueblo, Colorado | @ | Jonesy | __ linux FreeBSD 38.238N 104.547W | jonz.net | DM78rf | 73 SKi |
#6
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Gain vs boom length
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