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Total 20 documents matching your query.

1. [TowerTalk] Dipole gain? (score: 1): Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>; Date: Mon, 8 Dec 2014 21:45:59 -0500; Even if this is not the "right" forum i still think this is the place there I can get an answer. I was told (a long time ago) that the dipole had a 3 dB gain over the isotropic radiator maybe even a; /archives//html/Towertalk/2014-12/msg00067.html (7,646 bytes)
2. Re: [TowerTalk] Dipole gain? (score: 1): Author: Ken <wa8jxm@gmail.com>; Date: Tue, 9 Dec 2014 16:46:38 -0500; And since very few of us operate in free space, dipole gain varies all over the scale dependent on hight above ground and the angle you want to measure the gain at. I have recently seen where a dipol; /archives//html/Towertalk/2014-12/msg00077.html (8,142 bytes)
3. Re: [TowerTalk] Dipole gain? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Tue, 09 Dec 2014 13:53:48 -0800; In actuality, gain in a non rotatable antenna is a myth. OVERALL, an antenna has no gain over an isotropic radiator, it just subtracts strength is one direction and focuses it elsewhere. Thats good i; /archives//html/Towertalk/2014-12/msg00078.html (8,072 bytes)
4. Re: [TowerTalk] Dipole gain? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 09 Dec 2014 21:12:44 -0800; False. Gain for antennas is usually expressed as dBi, meaning dB referenced to an ideal isotropic radiator. Gain is not a single number (unless the antenna is isotropic) -- it varies with both vertic; /archives//html/Towertalk/2014-12/msg00090.html (9,578 bytes)
5. Re: [TowerTalk] Dipole gain? (score: 1): Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>; Date: Wed, 10 Dec 2014 08:09:49 -0400; Stacking dipoles like in the FM radio world produces significant gain of course. If the dipoles are of the same polarity and properly stacked and fed you can double your radiated power every time you; /archives//html/Towertalk/2014-12/msg00091.html (11,210 bytes)
6. [TowerTalk] Dipole gain? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 10 Dec 2014 19:32:53 -0800; False. Gain for antennas is usually expressed as dBi, meaning dB referenced to an ideal isotropic radiator. Gain is not a single number (unless the antenna is isotropic) -- it varies with both vertic; /archives//html/Towertalk/2014-12/msg00105.html (9,294 bytes)
7. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Dec 2014 09:05:28 +0000; The problem with using dBd is that a Yagi's advantage over a half-wave dipole (at the same height) can vary with height! So a dBd figure is only valid at one particular height, over one particular se; /archives//html/Towertalk/2014-12/msg00107.html (8,193 bytes)
8. Re: [TowerTalk] Dipole gain? (score: 1): Author: Stan Stockton <wa5rtg@gmail.com>; Date: Thu, 11 Dec 2014 04:30:20 -0600; If every antenna were compared to every other antenna in terms of free space gain and all in the same unit of measure (say dBI) and if the numbers for gain F/B, F/R, etc were shown as average across; /archives//html/Towertalk/2014-12/msg00108.html (10,286 bytes)
9. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Dec 2014 10:52:00 +0000; I agree that Free Space figures are probably the least ambiguous; but I'm not convinced that "averages" are very helpful! What do we mean by "average"? What's the average of two F/B ratios, one of 10; /archives//html/Towertalk/2014-12/msg00109.html (8,718 bytes)
10. Re: [TowerTalk] Dipole gain? (score: 1): Author: Stan Stockton <wa5rtg@gmail.com>; Date: Thu, 11 Dec 2014 05:35:35 -0600; I'm talking about 350 numbers averaged, for example covering the 20 meter band - not averaging two numbers like 10 and 20 dB and I'm suggesting that because an antenna can have in excess of 60 dB of; /archives//html/Towertalk/2014-12/msg00110.html (10,708 bytes)
11. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Dec 2014 11:43:29 +0000; Stan, I agree with what you say, but I'm challenging your idea of quoting an average. Let's say the F/R at 175 of the frequencies is 10db, and for the other 175 frequencies it is 20dB - what are you; /archives//html/Towertalk/2014-12/msg00112.html (10,973 bytes)
12. Re: [TowerTalk] Dipole gain? (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 11 Dec 2014 07:55:57 -0500; That's only true at relatively low heights for horizontal polarization. It can be a factor at heights below roughly one wavelength but the significance varies depending on front to side ratio of the; /archives//html/Towertalk/2014-12/msg00113.html (9,683 bytes)
13. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Dec 2014 14:03:24 +0000; Stan, I agree with what you say, but I'm challenging your idea of quoting an average. Let's say the F/R at 175 of the frequencies is 10db, and for the other 175 frequencies it is 20dB - what are you; /archives//html/Towertalk/2014-12/msg00114.html (10,645 bytes)
14. Re: [TowerTalk] Dipole gain? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Thu, 11 Dec 2014 08:26:48 -0800; On 12/11/14, 3:35 AM, Stan Stockton wrote: I'm talking about 350 numbers averaged, for example covering the 20 meter band - not averaging two numbers like 10 and 20 dB and I'm suggesting that because; /archives//html/Towertalk/2014-12/msg00119.html (11,424 bytes)
15. Re: [TowerTalk] Dipole gain? (score: 1): Author: Stan Stockton <wa5rtg@gmail.com>; Date: Thu, 11 Dec 2014 10:44:02 -0600; Steve, In your unlikely example it would be 15 dB. I think it would not be possible to design an antenna such that the F/R changed by 10 dB in one KHz on the HF bands. I certainly would not want to s; /archives//html/Towertalk/2014-12/msg00120.html (13,776 bytes)
16. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 11 Dec 2014 16:59:48 +0000; Stan, I was trying to highlight a particular issue - that averaging the dB figures themselves is a pretty meaningless exercise. In my example, the average rearward power ratio would be 12.6dB not 15d; /archives//html/Towertalk/2014-12/msg00121.html (9,609 bytes)
17. Re: [TowerTalk] Dipole gain? (score: 1): Author: Dan Maguire via TowerTalk <towertalk@contesting.com>; Date: Thu, 11 Dec 2014 14:43:32 -0800; One of the antennas described on the W8WWV page above is what Greg calls his "Benchmark Beverage". That particular model was used (with permission) as one of the AutoEZ examples. To see how the Max G; /archives//html/Towertalk/2014-12/msg00132.html (9,419 bytes)
18. Re: [TowerTalk] Dipole gain? (score: 1): Author: Dan Maguire via TowerTalk <towertalk@contesting.com>; Date: Thu, 11 Dec 2014 14:43:45 -0800; One of the antennas described on the W8WWV page above is what Greg calls his "Benchmark Beverage". That particular model was used (with permission) as one of the AutoEZ examples. To see how the Max G; /archives//html/Towertalk/2014-12/msg00133.html (9,058 bytes)
19. [TowerTalk] Dipole gain? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 19 Dec 2014 10:56:38 -0800; The problem with using dBd is that a Yagi's advantage over a half-wave dipole (at the same height) can vary with height! So a dBd figure is only valid at one particular height, over one particular se; /archives//html/Towertalk/2014-12/msg00287.html (9,235 bytes)
20. Re: [TowerTalk] Dipole gain? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 19 Dec 2014 19:18:09 +0000; Jim, If you want to use Free Space as the environment for comparison - which I whole heartedly support - simply use dBi; I never came across dBd in the whole of my professional career. What you then; /archives//html/Towertalk/2014-12/msg00288.html (8,203 bytes)

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