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Telamon wrote:
In article , Billy Burpelson wrote: Telamon wrote: Do you understand the direct and moon reflected signals do not exist at the same time anywhere on the earth? Do -you- understand what I wrote? Do you grasp the concept? Please pay attention. Yes I understand what you wrote loser and I'm doing my best to explain that your thinking is incorrect. I'm the second person tell you this. I -never- said the direct and reflected signals would exist at the -same- time 'anywhere on earth'. I didn't say you did. I was trying to give you the bigger picture. What I -did- speculate on is that a *portion* of the echo (the echo's leading edge) will be QRM'd *right as it leaves the moon* (the first 0.75 seconds of the echo) by the trailing edge of the incident wave (its last 0.75 seconds). Therefore, either a shortened echo (due to full cancellation of the 'overlap', which is unlikely) or an echo with a distorted or weakened leading edge (more likely) will ultimately reach the earth, depending on how much out-of-phase cancellation at the moon end of the circuit occured. OK you misunderstood what I wrote, which is these EM waves can mix as you think in a antenna in the part of space where the wave going to the moon exists in the same space time as the reflected signal. Without the antenna these waves do not interact. With the antenna they do interact. Is that redundant enough for you? Logically, since no antennas exist in this area of space time your idle speculation is moot. Now you have had two people explain this to you so if this does not sink into your very dense skull give up. Let me explain something else to you O'clueless wonder and that's if you don't get it your problem not mine. A basic web search on wave propagation theory says *nothing* about needing an antenna for the signals to add or cancel. HSD gets it; RHF gets it, but you don't seem to get it. Here are a few references that may help you: from http://en.wikipedia.org/wiki/Interference Theory The principle of superposition of waves states that the resultant displacement at a point is equal to the vector sum of the displacements of different waves at that point. If a crest of a wave meets a crest of another wave at the same point then the crests interfere constructively and the resultant wave amplitude is greater. If a crest of a wave meets a trough of another wave then they interfere destructively, and the overall amplitude is decreased. [please note: it just says 'if they meet'. Nothing about needing an antenna.] Characteristics All waves have common behavior under a number of standard situations. All waves can experience the following: * Reflection - wave direction change from hitting a reflective surface * Interference - superposition of two waves that come into contact with each other (collide) [Please note it says nothing about colliding in an antenna] from http://en.wikipedia.org/wiki/Superposition_principle First version of the superposition principle * The phenomenon of interference between waves is based on the superposition principle. Waves are usually described by variations in some parameter through space and time (for example, height in a water wave, pressure in a sound wave, or the electromagnetic field in a light wave). The superposition principle says that the net variation in that parameter caused by two or more waves traversing the same space, is the sum of the variations of that parameter which would have been produced by the individual waves separately. (For waves described by vector fields, such as electromagnetic waves, the sum is a vector sum.) In some cases, the summed variation has a smaller amplitude than the component variations; this is called destructive interference. Other times, the summed variation will have a bigger amplitude than any of the components individually; this is called constructive interference. [Again, please note that -nothing- is said about requiring an antenna.] from http://antoine.frostburg.edu/chem/se...glossary.shtml Interference. Interfering. Compare with constructive interference and destructive interference. The amplitudes of waves moving into the same region of space add to produce a single resultant wave. The resulting wave can have higher or lower amplitude than the component waves. See constructive interference* and destructive interference*. [Again, please note that they refer to 'same region of space', and say nothing of requiring an antenna] Nothing in wave theory says an 'antenna' is required for interference to occur. Finally, I originated a polite, on-topic post. You responded with vulgarity, name-calling and rudeness. Hopefully, you will eventually awaken to the fact that your obnoxious behavior hurts no one but yourself and serves only to illustrate your character (or lack thereof). |
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