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CIRCULAR WAVEGUIDES 643
diagram in Fig. 8 assumes that for correct Q the output of the Q model is K times as large as its input so that for correct Q the inputs of the comparator are equal. The DC error signal VQ resulting from the comparison is fed back to the Q model circuit to adjust the bias voltages appropriately, as well as to the lter. In these two interacting control loops, the frequency loop will converge independently of the Q control loop, but to converge on the correct value of Q, the frequency must be accurate. Hence, the two loops must operate together. The correct operation and convergence of the frequency and Q control scheme in Fig. 8 has been veried by experiments (see Schaumann et al. [3], Chapter 7, pp. 410
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