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#1
June 13th 07, 02:00 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
I'm comparing elevation plots of an antenna. They have different
forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike |
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#2
June 13th 07, 02:16 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
amdx wrote:
I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR |
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#3
June 13th 07, 02:21 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
On 12 Jun, 18:16, Tom Ring wrote:
amdx wrote: I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR I would imagine he is checking for cross polarisation |
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#4
June 13th 07, 02:56 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
"Tom Ring" wrote in message . .. amdx wrote: I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR Very broadbanded. |
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#5
June 13th 07, 04:48 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
Jimmie D wrote:
I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR Very broadbanded. Ridiculous. tom K0TAR |
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#6
June 13th 07, 04:50 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
amdx wrote:
I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike Under 'Desc Options', under '2D Misc', under 'Outer Ring', you can set the gain of the outer ring to -19 dBi for both antennas. -- 73, Cecil http://www.w5dxp.com |
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#7
June 13th 07, 11:16 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
"Tom Ring" wrote in message . .. amdx wrote: I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR but 0dBi would be perfectly omnidirectional by definition. either he is reading the scale wrong or is looking at f/b ratio instead of gain, or maybe looking at depth of a null or sidelobes. |
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#8
June 13th 07, 11:56 AM
posted to rec.radio.amateur.antenna
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Help with EZNEC
In article , Tom Ring
wrote: It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR Hello, and you can just integrate a pad into the antenna feedpoint and market it as a broadband antenna - Works 2-30 MHz with no tuning required! ;-) Sincerely, and 73s from N4GG0, John Wood (Code 5550) e-mail: Naval Research Laboratory 4555 Overlook Avenue, SW Washington, DC 20375-5337 |
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#9
June 13th 07, 12:04 PM
posted to rec.radio.amateur.antenna
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Help with EZNEC
"Cecil Moore" wrote in message et... amdx wrote: I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike Under 'Desc Options', under '2D Misc', under 'Outer Ring', you can set the gain of the outer ring to -19 dBi for both antennas. -- 73, Cecil http://www.w5dxp.com Thank you Cecil, I'll give that a try. |
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#10
June 13th 07, 12:11 PM
posted to rec.radio.amateur.antenna
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Help with EZNEC
"Tom Ring" wrote in message . .. amdx wrote: I'm comparing elevation plots of an antenna. They have different forward gains, this makes it difficult to compare the lobe shape. Is there a way to equalize the gains to do a comparison? Example: I have an antenna that is -19dbi and one that is -23dbi. Can I add 4db of gain to one to make the comparison easier? Mike I am wondering what type of antenna has -19 or -23 dBi gain. I would speculate that they are quite omnidirectional, and the patterns wouldn't be significantly different. It's tough to get gain that low unintentionally. If they are commercial, could you please point me at a web site? I'd love to see why they made these. tom K0TAR I'm modeling a Flag antenna. It is a directional antenna. Small size for the low bands. Btw, this site has one that has -43dbi gain. http://taliaphoto.com/n4is/BIG_DUAL_LOOP.html I'd like to have one! Mike |
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