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Step 9.
We now compare the measured power delivered with the calculated power, using the power transmission coefficient, 1 – ?2. The calculated power delivered is: 100w × (1 – ?2) = 76.6w, compared to the 75w indicated by the Bird wattmeter. However, because the new load impedance is less than the original 50 ohms, and also reactive, the amplifier is now overloaded and the pi-network is detuned from resonance. Consequently, the plate current has increased from 260 to 290 ma, plate voltage has dropped to 760 v, and DC input power has increased from 208 w to 220.4 w. Points in response: 1.This is a surprising departure from reporting in the progression of the protocol. We now find current and voltage reports where formerly they were either dismissed or neglected. However, we will take these as they are reported here. 2.It appears that the calculated power and the reported power agree, this is not directly expressed, but neither these remarks are not stated as being in conflict. Given the editorialization that inhabits the protocol in general, these remarks are remarkably dry and unconnected. 3.Following, with the editorial comment that the amplifier is now overloaded, the connotation is necessarily a rejection of the thesis: output source resistance of the RF power amplifier is non-dissipative; otherwise the condition giving rise to the overload would be of no particular consequence nor interest. Rather, the cautionary should have been the amplifier is not delivering its Maximum Available Power (once again, having raised this topic early on, it is curiously missing as a rhetorical observation). The dialectic seems to have promoted the subordinate thesis while the data in the observations have destroyed it. 4.The detuned state is an untested conjecture. Its inclusion adds nothing without both a rigorous examination and explaining the speculative correlation as causation. 73's Richard Clark, KB7QHC |
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