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On Mon, 26 Mar 2007 19:56:02 GMT, Walter Maxwell
wrote: I call this condition 1. It exhibits a mismatch and it exhibits the probability of the reflected energy being absorbed by the source to the degree of the phase relationships. Richard, although it exhibits a mismatch, and thus detunes the source, the probability of the reflected energy being absorbed by the source is zero. The additional power dissipated in the source is due to lowered impedance of the network resulting from off-resonance operation, thus increasing the plate current. The reflected energy does not enter the network, but only results in a decrease in the power delivered relative to that when the reactance in the load is cancelled by correct retuning of the source network. Hi Walt, Examples of separable energies in lines abound. We needn't have to go into circulators, isolators, directional couplers (the real ones, not the Bruene variety) and the rest, which all exhibit classic separation to achieve many design goals. Hence, it follows that reverse energy is real. The longer you pour energy into a mismatch, the longer it will reflect it back. Longer brings time into the discussion and hence power. Power is directly correlateable to heat. Now, the amount of heat is directly correlateable to phase relations. If they are aligned at one of the cardinal points, heat will drive up. If they are aligned at the other cardinal point (180 degrees away) heat will fall. Heat is positive proof of resistance. Being hot or cold is sensation, not heat per se. That is, if the source cools, this is not proof of the source not exhibiting a source resistance - phase does not create nor diminish resistance. Or to put it another way, source resistance is not a function of phase. There is a continuum of phase relationships expressed in angles between 0 and 360. Half will tend to heat, half will tend to cool. Energy is dissipated for the full 360 degrees. When that reverse energy arrives by transmission line, it sees a load. Complex as it is, it must resolve to find itself within this continuum of response. Examples of plate incandescence or arcing are not trivial parlor tricks. You can force the situation with a lumped equivalent, but a lumped equivalent will not prove any invalidity of the transmission line model it replaces (which, on the face of it, is an ironic appeal). This can be simply proven in that a lumped equivalent does not exhibit ALL the characteristics of energy storage in a long line. Some (others than you, Walt) may be tempted to trot out the ghosts in the TV line proof. That is certainly one characteristic that a lumped equivalent can never exhibit (and yet the equivalent acts like the line to an amazing degree for many considerations). No, I won't delve into the endless debate about transient vs. steady state. This is an argument about as insipid as can be offered (by others than you, Walt) as if it made any difference. Rather, a resonant line will exhibit identical properties of resonance at harmonics - a lumped equivalent will not. It is quite obvious that a lumped equivalent is not wholly equivalent, except for a highly constrained example. To say (by others than you, Walt) it supports a general solution that invalidates the line's reality is as absurd a notion as any that are trotted around the track here. In short, if a line exhibits itself as a source of energy for any example, no equivalent can negate that physical truth in a proof for other use. Hence, it follows that: 1. reflected energy is real and consequential; 2. sources exhibit resistance to energy flow; 3. 1 & 2 combine by their phase to result in a change of heat - dissipation; 4. the operator of either a tube or transistorized rig can adjust the phase of 1 through the intermediary of tuning (or conjugating); 5. absolutely no intervention impacts 2, except by degree; 6. successful/unsuccessful intervention still proves 3. 73's Richard Clark, KB7QHC |
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