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"Non-dissipative Source Resistance"
On Jun 13, 12:12*pm, Richard Clark wrote:
On Sun, 13 Jun 2010 05:17:54 -0700 (PDT), Richard Fry wrote: the PA tube -- whose non-linear characteristics From Mendenhall: "VHF amplifiers often exhibit a somewhat unusual characteristic when tuning for maximum efficiency. ... If the amplifier is tuned exactly to resonance, the plate load impedance will be purely resistive and teh load line will be linear." 'Unusual'? Certainly not unexpected once one thinks about it. For a given controlled power, the minimum dissipation in the controlling device will occur when the minimum voltage occurs at the time of maximum current, and vice versa, i.e. the voltage and current in the load are in phase, or equivalently, the load impedance is resistive. I would expect this to be a fundamental characteristic, and not just for VHF amplifiers. The 60Hz folk are trying to achieve the same result as they strive for a power factor of 1. ....Keith |
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