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nuckolls.bob(at)aeroelect
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doramsey(at)gmail.com
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 Posted: Sat Nov 19, 2011 11:39 am Post subject: RAMI vs. Dorne-Margolin vs. DIY Antennas |
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So if I understand his schematic, this there is a capacitor between the BNC and the antenna on the AV-17. I am no EE, but wouldn't it make sense
that with the low energy of a multimeter that you would show no continuity between the center conductor and the antenna rod?
On Sat, Nov 19, 2011 at 1:40 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
I've posted Don's data to the website. Just to make
sure this data gets 'tags' in the Matronics archives
I offer the following links:
http://aeroelectric.com/Pictures/Antenna/Rami_AV-17_SWR_Plot.jpg
http://aeroelectric.com/Pictures/Antenna/Rami_and_D+M_Matching_Networks.jpg
It's interesting to note that the VSWR plot is below
2:1 over a large portion of the target frequency range.
Creative matching can elevate the production article
a step above the simple DIY "whisker."
Bob . . .
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loboflyer(at)gmail.com
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| Posted: Sat Nov 19, 2011 12:44 pm Post subject: RAMI vs. Dorne-Margolin vs. DIY Antennas |
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On Sat, Nov 19, 2011 at 12:37 PM, Dennis Ramsey <doramsey(at)gmail.com (doramsey(at)gmail.com)> wrote:
| Quote: | So if I understand his schematic, this there is a capacitor between the BNC and the antenna on the AV-17. I am no EE, but wouldn't it make sense
that with the low energy of a multimeter that you would show no continuity between the center conductor and the antenna rod?
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This is true. An ohmmeter would show an open circuit since a meter measures at low frequencies (DC!).
A question for the list:
Antennas that are DC coupled to ground (e.g. through an inductor) have a discharge path for charges that build up on the antenna. Clearly, Rami knows what they are doing and has a working product. How does an antenna like this bleed off static? Is the air interface more important than the electrical interface in this regard?
-Jeff-
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