|
A dipole over ground
The following shows the effect on elevation pattern for a 1/2 wave
dipole antenna over ground at various heights for perfect, very good, average, and extremely ground. The important value to note is the elevation angle for the main lobe. Generally for DX an elevation angle at or below 30 degrees is desirable and for NVIS an angle above 60 degrees. The elevation angles apply to any dipole type antenna, such as a G5RV, OCF dipole, etc. but the absolute gain values will be quite different. Also some types of dipoles have more lobes than the two of the 1/2 wave dipole; those lobes will still be elevated. Perfect V good Avg Ext poor Height gain @ elev gain @ elev gain @ elev gain @ elev 0.10 8.6 90 6.3 90 4.4 90 3.1 90 0.15 8.4 90 7.1 90 5.8 90 4.3 90 0.20 8.0 90 7.1 90 6.1 90 4.6 66 0.25 7.4 90 6.7 68 5.9 61 4.8 50 0.30 6.9 56 6.4 51 5.9 48 5.1 41 0.35 6.8 45 6.5 42 6.1 40 5.4 35 0.40 7.1 39 6.9 36 6.5 35 5.8 31 0.45 7.7 33 7.5 32 7.0 31 6.3 28 0.50 8.3 30 8.1 29 7.6 28 6.7 25 0.55 8.9 27 8.5 26 7.9 25 6.9 23 0.60 9.1 25 8.6 24 8.0 23 6.9 21 0.65 8.9 23 8.4 22 7.8 21 6.9 20 0.70 8.5 21 8.0 20 7.6 20 6.8 18 0.75 8.0 19 7.7 19 7.3 18 6.7 17 0.80 7.6 18 7.4 18 7.2 17 6.7 16 0.85 7.5 17 7.4 17 7.2 16 6.7 15 0.90 7.6 16 7.5 16 7.3 15 6.9 15 0.95 7.8 15 7.7 15 7.5 15 7.1 14 Special note: Most people understand that the results of an antenna analysis program reflect the material used to construct the antenna and the type of ground, if any, used for the analysis, are an approximation, and are not accurate to 27 decimal places. Further, most people also understand that absent them being a part of the model used for the analysis, objects in the near field of the antenna, such as, but not limited to, 20 foot prision walls, blimp hangers, skyscrapers, a deluge of biblical proportions, giant sequoia trees, hovering 2 mile wide alien spacecraft, hords of locusts, large gold deposits under the antenna, battles between Autobots and Decepticons, beached aircraft carriers, and stadium domes may well effect the actual antenna perfomance. Your mileage may vary, void where prohibited. Any spelling mistakes in this article are all entirly my fault. Any grammer errors spotted in this article were put there because I could. -- Jim Pennino |
A dipole over ground
Jerry Stuckle wrote:
snip Very good. You can cut and paste. Too bad you can't understand what you're cutting and pasting, especially how to apply it. You should see someone about getting that stick pulled out that is firmly shoved up your butt. After you do that, you can comment on the repeatable data I posted. -- Jim Pennino |
A dipole over ground
On 11/15/2014 9:17 PM, wrote:
Jerry Stuckle wrote: snip Very good. You can cut and paste. Too bad you can't understand what you're cutting and pasting, especially how to apply it. You should see someone about getting that stick pulled out that is firmly shoved up your butt. After you do that, you can comment on the repeatable data I posted. ROFLMAO! At least my head isn't there - like yours is. Sure, you can cut and paste. Too bad you can't understand what you're cutting and pasting, especially how to apply it. You've made yourself perfectly clear in multiple comments. You don't understand a thing about dipoles. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
A dipole over ground
manual calculation of a horizontal Lambda/2-dipol over perfect ground in
height of Lambda/2 www.leobaumann.de/horDipolOPG.pdf Izur Kockenhan |
A dipole over ground
Jerry Stuckle wrote:
On 11/15/2014 9:17 PM, wrote: Jerry Stuckle wrote: snip Very good. You can cut and paste. Too bad you can't understand what you're cutting and pasting, especially how to apply it. You should see someone about getting that stick pulled out that is firmly shoved up your butt. After you do that, you can comment on the repeatable data I posted. ROFLMAO! At least my head isn't there - like yours is. So where are your insightful comments on the data or is puerile drivel all you've got? snip puerile drivel -- Jim Pennino |
A dipole over ground
Izur Kockenhan wrote:
manual calculation of a horizontal Lambda/2-dipol over perfect ground in height of Lambda/2 www.leobaumann.de/horDipolOPG.pdf Izur Kockenhan The broadside nulls are missing. -- Jim Pennino |
A dipole over ground
Jim Pennino wrote:
The broadside nulls are missing. A dipol over perfect ground has no broadside nulls. A dipol in free space has alongside nulls. Pls. check out with 4NEC2. Have a nice weekend Izur Kockenhan |
A dipole over ground
On 11/16/2014 12:32 AM, wrote:
Jerry Stuckle wrote: On 11/15/2014 9:17 PM, wrote: Jerry Stuckle wrote: snip Very good. You can cut and paste. Too bad you can't understand what you're cutting and pasting, especially how to apply it. You should see someone about getting that stick pulled out that is firmly shoved up your butt. After you do that, you can comment on the repeatable data I posted. ROFLMAO! At least my head isn't there - like yours is. So where are your insightful comments on the data or is puerile drivel all you've got? snip puerile drivel I've presented proof already you're full of crap. Not that your statements need any refutation - they are among the most stoopid I've seen on usenet - and that's pretty stoopid. But I am not going to get into a technical argument with you. I don't debate the defenseless. I just let their statements stand on their own. -- ================== Remove the "x" from my email address Jerry Stuckle ================== |
A dipole over ground
On 11/15/2014 10:51 PM, Izur Kockenhan wrote:
manual calculation of a horizontal Lambda/2-dipol over perfect ground in height of Lambda/2 www.leobaumann.de/horDipolOPG.pdf Izur Kockenhan You're arguing with an idiot. He thinks the charts he copies/pastes are the last word and apply to all dipoles. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
| All times are GMT +1. The time now is 01:52 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com