d. limiter and discriminator.
3. The oscillator type of squelch circuit is preferred to other types of squelch
circuits in a portable, battery-operated FM receiver because
a. the squelch level is relatively independent of the supply voltage.
b. the circuit needs no adjustment when the battery becomes weak.
c. fewer stages are required to establish the squelch level.
d. the drain upon the battery is negligible.
4. If block V in figure 4-5 represents a ratio detector in the FM receiver,
block IV represents
a. a limiter.
b. an IF amplifier.
c. a squelch circuit.
d. a locked oscillator.