Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

.PUSH-PULL CIRCUIT 457the push-pull FM circuit is particularly adapted to the use of 2 capacitorsarranged for push-pull action.The combining of 2 frequency modulations is accomplished by employinga small condenser, one side of which is connected across theoscillator coil and the other across the discriminator coil. The commoncenter plate is grounded. If the center grounded plate is moved ineither one of 2 directions, the frequency shifts of the oscillator andthe discriminator circuits will be in opposite directions to each other resultingin push-pull action. Such a circuit is shown in Figure 5. In thiscircuit, coil (L x ) and one half of the push-pull condenser (Cj), togetherc 26SF7POWDERED IRON COREUwJ/£?