A general technique for interference filtering

With one exception, the radiation and leakage
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from a signal generator can be held below specified limits. Exception exists in the loop consisting of the signal generator power cord, the power main, the ground connection of the signal generator, and the signal generator itself. Signals passing through the line filter are resonated in this loop and these signals can only be reduced by mismatch or by reduction of the maximum power available. Since the nature of the loop is unpredictable, a mismatch that will hold in every case cannot be provided. A limit on the maximum power available holds in every case. This maximum available power theoretically can be measured and the limit which it should not exceed can readily be found. The load drawing maximum power from a three terminal network is found and the theory of measuring this maximum available power is developed herein. Also indicated are how a limit can be set on maximum available power and how a simple LC filter fails to provide reliable mismatch.