A. 24 V B. 48 V C. 96 V D. 120 V
226. What circuit recovers the original modulating information from an AM signal?
227. What is the most commonly used amplitude demodulator?
228. What circuit generates the upper and lower sidebands and suppresses the carrier?
A. Amplitude modulator B. Diode detector C. Class C amplifier D. Balanced modulator
229. _________ is a widely used balanced modulator.
230. In a diode ring modulator, the diodes act like
231. The output of a balanced modulator is
A. AM B. FM
232. The principal circuit in the popular 1496/1596 IC balanced modulator is a
233. The most commonly used filter in SSB generators uses
A. LC networks B. Mechanical resonators C. Crystals
234. In the phasing method of SSB generation, one sideband is canceled out due to
235. A balanced modulator used to demodulate a SSB signal is call a/an
236. Frequency translation is done with a circuit called a
B. Multiplier
C. Divider
D. Mixer 237. Mixing for frequency conversion is the same as A. Rectification B. AM C. Linear summing D. Filtering 238. Which of the following is not a major advantage of FM over AM? A. Greater efficiency B. Noise immunity C. Capture effect D. Lower complexity and cost
239. The primary disadvantage of FM is its
B. Excessive use of spectrum space C. Noise susceptibility D. Lower efficiency 240. Noise is primarily
C. Random level shifts D. Random frequency variations 241. The receiver circuit that rids FM of noise is the
C. Limiter D. Low-pass filter
242. The AM signals generated at a low level may only be amplified by what type of amplifier?
