Timeline for Ground plane reflects RF or brings it to ground
Current License: CC BY-SA 4.0
15 events
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| May 20, 2021 at 22:09 | comment | added | Phil Frost - W8II | See ham.stackexchange.com/questions/10173/… for an idea of what most people mean when they say "balanced". It sounds like by "balanced" you mean what is often called "differential-mode current". I've heard this usage elsewhere, but it's confusing, and probably why this question is being asked. | |
| May 20, 2021 at 21:46 | comment | added | Mike Waters | Respectfully, you are very much mistaken. @PhilFrost-W8II (an expert on this) and I disagree. | |
| May 20, 2021 at 21:35 | comment | added | Mike Waters | Dragging a counterpoise on which band, and what kind? | |
| May 20, 2021 at 4:18 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 20, 2021 at 0:57 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 20, 2021 at 0:48 | comment | added | hotpaw2 | Over a solid conductive ground plane, a vertical monopole appears to be balanced by a virtual mirror image below the ground plane, the image created by what is seen in the far field as a reflection of the EM field off of the ground plane, created by the summed symmetry of currents induced in the ground plane. | |
| May 20, 2021 at 0:42 | comment | added | hotpaw2 | One function of a large radial field is to approximate a (hopefully mostly) reflecting surface, and to capacitively and/or electrically couple to the ground which partially approximates an even larger (but more lossy) reflective surface. A single counterpose is too small to do either of the above well, so is usually modeled as a radiating element rather than a simple reflector, thus is often configured or tuned for some desired pattern and/or feed impedance. | |
| May 20, 2021 at 0:30 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 20, 2021 at 0:25 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 20, 2021 at 0:17 | comment | added | hotpaw2 | Conservation of charge and the fact that all magnetic lines of force form closed loops. No magnetic monopoles. No charge appearing at any point on any antenna without a balancing opposite change in charge somewhere else in the universe. If a negative charge appears at the tip of your vertical antenna for a few dozen nanoseconds, your lawn might have loaned the system a few electrons. Thus balanced. | |
| May 19, 2021 at 20:40 | comment | added | Phil Frost - W8II | I think you need to define what "balanced" means before you claim all antennas are balanced. Absent some other definition of the term, most people would say a vertical is unbalanced. | |
| May 19, 2021 at 20:21 | comment | added | Engineer999 | Thanks for your reply. Then there's the talk of using a counterpoise wire. Does this have the same effect as using radials? | |
| May 19, 2021 at 20:07 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 19, 2021 at 20:00 | history | edited | hotpaw2 | CC BY-SA 4.0 |
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| May 19, 2021 at 19:54 | history | answered | hotpaw2 | CC BY-SA 4.0 |