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#11
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A dipole over ground
wrote in message ... 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. snip 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 I'm having trouble wading through the data, probably because of column headings. Let's take the first line. 0.10 Would be the height I get lost after that. Is 8.6 the gain over perfect ground, 6.3 over good, etc. What are the 90's? Wayne W5GIE/6 |
#13
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A dipole over ground
Jerry Stuckle wrote:
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 But I am not going to get into a technical argument with you. You have no technical arguments. -- Jim Pennino |
#14
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A dipole over ground
Wayne wrote:
wrote in message ... 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. snip 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 I'm having trouble wading through the data, probably because of column headings. Let's take the first line. 0.10 Would be the height I get lost after that. Is 8.6 the gain over perfect ground, 6.3 over good, etc. What are the 90's? Wayne W5GIE/6 Height is the height in wavelengths. gain is the gain of the main lobe. @ elev is the elevation angle of the main lobe; 90 means straight up. And there are three sets for perfect, very good, average, and extremely poor ground. It all lines up in ASCII; if the spacing is screwed up, you are likely viewing it as HTML. -- Jim Pennino |
#15
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A dipole over ground
Izur Kockenhan wrote:
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 Correct; the broadside pattern is flattened, not nulled, over perfect ground which doesn't show too well in the 3-D plot. -- Jim Pennino |
#16
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A dipole over ground
Jeff Liebermann wrote:
On Sat, 15 Nov 2014 21:38:10 -0000, wrote: 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. This might help: http://802.11junk.com/jeffl/antennas/horizontal-dipole/ Animated GIF of the horizontal 1/2 wave dipole over a "moderate" ground at various heights: http://802.11junk.com/jeffl/antennas/horizontal-dipole/horiz-dipole.gif There's a big problem with the GIF. I couldn't convince 4NEC2 to fix the scale on the gain plot. So, it changes in the middle of the annimation. The outer ring is +5dBi for 0.1 to 0.3 wavelengths height, and +10dBi for the others. I'll try to fix that later. NEC deck for 4NEC2: http://802.11junk.com/jeffl/antennas/horizontal-dipole/Dipole.nec Yeah, graphs are better than tables of data any day. -- Jim Pennino |
#17
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A dipole over ground
wrote in message ... Wayne wrote: wrote in message ... 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. snip 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 I'm having trouble wading through the data, probably because of column headings. Let's take the first line. 0.10 Would be the height I get lost after that. Is 8.6 the gain over perfect ground, 6.3 over good, etc. What are the 90's? Wayne W5GIE/6 # Height is the height in wavelengths. # gain is the gain of the main lobe. # @ elev is the elevation angle of the main lobe; 90 means straight up. # And there are three sets for perfect, very good, average, and extremely # poor ground. # It all lines up in ASCII; if the spacing is screwed up, you are likely # viewing it as HTML. Not using HTML, but your explanation clears it up. Thanks. |
#18
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A dipole over ground
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#19
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A dipole over ground
On 11/16/2014 1:27 PM, wrote:
Jerry Stuckle wrote: 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 But I am not going to get into a technical argument with you. You have no technical arguments. I do. But you don't understand anything more complicated than 2+2=4. I know better than to try to have an intellectual discussion with an idiot. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
#20
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A dipole over ground
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