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Total 12 documents matching your query.

1. [Towertalk] limitations of stacking (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 22 Mar 2002 09:51:56 -0500; Is there a theoretical reason why the gain resulting from stacking two HF yagis over real ground is limited to 3 dB? I have a model of two C-3Es that shows 3.5 dB increase over a single C-3E in the t; /archives//html/Towertalk/2002-03/msg00547.html (7,820 bytes)
2. [Towertalk] limitations of stacking (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Fri, 22 Mar 2002 11:54:05 -0500; I would think the change in gain would depend on the arrival angle, the heights of the two antennas and the quality of the ground (reflection losses). Where does the 3db rule of thumb come from? Rega; /archives//html/Towertalk/2002-03/msg00556.html (8,901 bytes)
3. [Towertalk] limitations of stacking (score: 1): Author: n3rr@erols.com (Bill Hider (N3RR)); Date: Fri, 22 Mar 2002 12:07:21 -0500; Pete, If I understand your question correctly, there is no limitation of 3dB gain in stacking vs non-stacking. This is because high angle radiation and other radiation that was previously *not* inclu; /archives//html/Towertalk/2002-03/msg00557.html (9,260 bytes)
4. [Towertalk] limitations of stacking (score: 1): Author: n4kg@juno.com (n4kg@juno.com); Date: Fri, 22 Mar 2002 11:54:16 -0600; two position. Are you looking at a fixed angle, or the peak response for each configuration? If you double the received energy, you gain 3 dB. It is hard to imagine how doubling the number of antenna; /archives//html/Towertalk/2002-03/msg00558.html (8,691 bytes)
5. [Towertalk] limitations of stacking (score: 1): Author: wb9uwa@gte.net (WB9UWA Jim Shaffer); Date: Fri, 22 Mar 2002 18:44:36 -0600; Hi All, It has been my observation in looking at short yagis in free space, that a yagi with an already good front to side ratio my readily be stacked with 3 db gain. If you start with a yagi with a; /archives//html/Towertalk/2002-03/msg00559.html (10,525 bytes)
6. [Towertalk] limitations of stacking (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 22 Mar 2002 20:08:13 -0500; Physical size has little to do with gain, and nothing directly to do with received energy. Gain comes from pattern interference, where the radiation from each antenna cancels more in some directions; /archives//html/Towertalk/2002-03/msg00569.html (8,845 bytes)
7. [Towertalk] limitations of stacking (score: 1): Author: k1mk@arrl.net (Michael Keane, K1MK); Date: Sun, 24 Mar 2002 15:59:31 -0500; +3 dB is the maximum array factor for a two element array: the max gain over a single array element that can be realized for an array of two identical, non-interacting radiators having uniform excita; /archives//html/Towertalk/2002-03/msg00605.html (10,751 bytes)
8. [Towertalk] limitations of stacking (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Mar 2002 01:34:54 -0500; In my opinion it is both confusing and misleading to consider "gain" occurring from decreased radiation resistance. Pattern is what controls the directive gain. For a given applied power, and a give; /archives//html/Towertalk/2002-03/msg00616.html (9,410 bytes)
9. [Towertalk] limitations of stacking (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 25 Mar 2002 13:01:36 -0800 (PST); Non sequiturs about short antennas, loading, Qs, and losses not withstanding, application of that conceptual picture to the specific problem that was presented fails to make physical sense. In this c; /archives//html/Towertalk/2002-03/msg00633.html (12,976 bytes)
10. [Towertalk] limitations of stacking (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Mar 2002 20:05:33 -0500; Really? Please explain how two identical-pattern antennas, each lossless or with the same percentage of power loss, can have different gains. Better yet, point me to a engineering reference that des; /archives//html/Towertalk/2002-03/msg00639.html (8,080 bytes)
11. [Towertalk] limitations of stacking (score: 1): Author: k1mk@alum.mit.edu (Michael Keane, K1MK); Date: Mon, 25 Mar 2002 22:19:14 -0500; Really. Is it such a radical concept? Because the two antennas would have to possess different radiative resistances. Add to that the century and a half of physics subsequent to James Clerk Maxwell t; /archives//html/Towertalk/2002-03/msg00655.html (9,244 bytes)
12. [Towertalk] limitations of stacking (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 26 Mar 2002 05:44:43 -0500; Please tell me how, with fixed efficiency, one dipole has gain over another without having a pattern change. Is this like the folklore a double Bazooka or coaxial dipole has gain, or a folded s dipo; /archives//html/Towertalk/2002-03/msg00665.html (8,371 bytes)

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