Excerpt from Some Experiments With Coupled High Frequency Circuits
Very little experimental data has been given on the relative magnitudes of the currents in coupled circuits under different conditions of coupling. Fischer 1 has shown that, when a cir cuit containing a spark ... gap is coupled to a second oscillatory circuit and this second circuit in turn very loosely coupled to a third circuit containing a thermoelement, the current in the third circuit shows a well-marked maximum for a given degree of coupling between the first and second circuits, the current in the third circuit decreasing when the coupling between the first and second is either increased or decreased from this most favor able value. A very remarkable fact brought out in this paper is that for small degrees of damping the best results are to be obtained when the mutual inductance between the first and sec ond circuits is extremely small. The reason for this behavior of high-frequency transformers with damped oscillations can be easily qualitatively explained by considering the reaction of the circuit receiving the energy on the circuit from which the energy is received. As the coupling between the two is increased the receiving circuit tends to draw a greater amount of energy out of the sending circuit, and hence acts as an increasing resistance introduced into the sending circuit, increasing its damping and decreasing the amplitude of the oscillations. It appears desir able that further quantitative data on this subject should be given and it is with this object that the present work has been taken up.
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