AN 08-10-112 BC-348-J,N,Q Radio Receiver (maintenance)

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14 can be replaced by an equivalent circuit using an ideal transformer (Fig. 15a). Since an ideal transformer has no self-inductance, the inductances and coupling factor, k, must be added to the ideal transformer. The final circuit topology is shown in Fig. 15b). Looking toward the right through the ideal transformer, the circuit values in Fig. 13 fm2 Double-tuned transformer response. 14 L11 C1 C2 L22 RL Real transformer with resonating capacitances. 15 (a) Alternate equivalent circuit with ideal transformer and (b) final equivalent circuit.

4, which provides a design procedure for the tapped C matching circuit. Similar expressions could be found for a tapped inductor transforming circuit, but such a circuit is typically less useful because high Q inductors are more difficult to obtain than capacitors. 9 PARALLEL DOUBLE-TUNED TRANSFORMER Each of the above described T, π, or tapped C matching circuits provide some control over the bandwidth. Where precise control over the bandwidth is required, a double-tuned circuit allows controlling bandwidth by specifying two different frequencies where maximum transmission occurs.

12). 14) However, for narrow bandwidths, the arithmetic mean of the two 3-dB frequencies can be used with small error. 4 UNLOADED Q In real physical reactive elements there are always some resistive losses. The loss in a capacitor or an inductor can be described in terms of its Q. For example, if a lossy inductor is placed in parallel with a lossless capacitor, the Q of the resulting parallel circuit is said to be the circuit Q of the inductor. 16) Similarly, for a lossy capacitor, its resistive component could be expressed in terms of the capacitor Qcap.

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