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This causes the theoretical maximum efficiency to be higher than 50%.
Thanks for explaining this. The 50% number assumes a centered Q point and sine waves with a resistive load. I thought perhaps you were thinking of a class B, but this helps.
I believe you have the correct image of the SSTRAN output network. The collector current is supplied though a choke coil. As modified for a base coil antenna, there is a capacitor from collector to ground. From what I understand from Phil’s descripton, the system is tuned so that the antenna circuit presents an R + jX load with the jX of the coil providing the inductance for the impedance transforming ell network. This implies that the base coil inductance and the antenna capacitance do not operate exactly at resonance, rather off resonance just enough to provide the proper inductance in the network. This is my understanding and if not correct I hope not to mislead anyone.
I tried my efficiency tests on the SSTRAN before I understood this. Maybe it is time to try it again. I’ll dust off the old roller-inductor. I also had good results (compared to actual measurements) with an Electronic Workbench (R) simulation. I’ll try that first.