MM0704, Lesson 1
Uses of Parallel Resonant Circuits. Since the parallel resonant circuit has a high impedance, it is often useful for
rejecting undesired frequencies. An example is the wave trap, figure 1-11, which is used to reject an undesired signal
from a receiver. It consists of a parallel resonant circuit in series with the antenna of the receiver and tuned to the
interfering frequency.
Figure 1-11. Parallel Resonant Circuit Used as Wave Trap.
Another function of the parallel resonant circuit is that of determining the frequency of operation of radio and radar
transmitters. The parallel resonant circuit lends itself very well to vacuum tube generators, which have a high internal
Table 1-1. Comparison of Series and Parallel Resonance.
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