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Keith Dysart wrote:
You used your tool to attempt to show that the reflected power is dissipated in Rs. The tool proves that the reflected average power is dissipated in Rs because it has no where else to go. If instantaneous reflected power were relevant, why don't we read about it in any of the technical textbooks under the wave reflection model? I did a finer grained analysis using instantaneous power to show that it is not. My tool is known not to work for instantaneous power and was never intended to work for instantaneous power. So your argument is just a straw man diversion. Eugene Hecht explains why average power density (irradiance) must used instead of instantaneous power. "Furthermore, since the power arriving cannot be measured instantaneously, the detector must integrate the energy flux over some finite time, 'T'. If the quantity to be measured is the net energy per unit area received, it depends on 'T' and is therefore of limited utility. If however, the 'T' is now divided out, a highly practical quantity results, one that corresponds to the average energy per unit area per unit time, namely 'I'." 'I' is the irradiance (*AVERAGE* power density). The use of averages in analysis can be misleading. The misuse of a tool, designed to be used only with averages, can be even more misleading. When you measure an open-circuit using a DC ohm-meter on a dipole, are you really going to argue that the DC ohm-meter is not working properly? That's exactly what you are arguing here. When one misuses a tool, as you are doing, one will get invalid results. There's no mystery about that at all. You are saying that the energy model, designed to be used with average powers, does not work for instantaneous values. When you try to use it for instantaneous values, you are committing a well understood error. Why do you insist on committing that error? 5. ______________________________________________. Now you have got the issue. Since the reflected power is not dissipated in Rs, the answer must be one of 1 to 5. 5. is probably the best choice. Until you fill in the blank for number 5, you are just firing blanks. :-) Exactly what laws of physics are you intending to violate with your explanation? And that is why it became necessary to rethink the nature of energy in reflected waves. Nope, it's not. Reflected waves obey the laws of superposition and reflection physics. That's all you need to understand. Now new laws of physics or logical diversions required. -- 73, Cecil http://www.w5dxp.com |
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