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Selectivity is the ability of a receiver to respond to a desired signal, but not to undesired ones This generally means that a receiver must have a frequency window within which it is sensitive, but outside of which it is not at all sensitive This window is established by a preselector in the early RF amplification stages of the receiver and is honed to precision by a narrowband filter in a later amplifier stage Suppose you want to receive an LSB signal whose suppressed-carrier frequency is 3885 MHz The signal information is contained in a band from 3882 to 3885 MHz, a span of 3 kHz The preselector makes the receiver sensitive in a range of about plus or minus 10 percent of the signal frequency; other frequencies are attenuated This reduces the chance for a strong, out-of-band signal to impair the performance of the receiver The narrowband filter responds only to the frequencies 3882 to 3885 MHz, so that signals in adjacent channels are rejected The better this filter works, the better the adjacent channel rejection

(c) a transient (d) an avalanche (e) a clipped peak 5 Which of the following is not characteristic of an oscillator (a) Negative feedback (b) Good output-to-input coupling (c) Reasonably high transistor gain (d) Alternating current signal output (e) Usefulness as a signal generator 6 Which layer of the ionosphere exists at the lowest altitude (a) The F layer (b) The E layer (c) The D layer (d) The C layer (e) The B layer 7 The beta of a bipolar transistor is another name for its (a) current amplification factor (b) voltage amplification factor (c) power amplification factor (d) maximum amplification frequency (e) optimum amplification frequency 8 In a schematic diagram, the symbol for a PNP bipolar transistor can be recognized by (a) a broken vertical line inside the symbol circle (b) an arrow inside the symbol circle, pointing from the base toward the emitter (c) an arrow inside the symbol circle, pointing outward from the collector (d) a collector biased at a positive voltage with respect to the emitter (e) an arrow inside the symbol circle, pointing from the emitter toward the base is an 9 Fill in the blank in the following sentence to make it true: In an oscillator, expression of the extent to which the circuit maintains constant signal frequency output under variable operating conditions, and is also an expression of its overall reliability (a) sensitivity (b) drift ratio (c) gain (d) selectivity (e) stability 10 A Zener diode would most likely be found in (a) the mixer in a superheterodyne receiver (b) the PLL in a circuit for detecting FM

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( 1, 2)

The signals at a receiver input vary over several orders of magnitude If you are listening to a weak signal and a strong one comes on the same frequency, you don t want to get your eardrums damaged! But also, you want the receiver to work well if a strong signal appears at a frequency near (but not exactly on top of) the weak one Dynamic range is the ability of a receiver to maintain a fairly constant output and to keep its sensitivity in the presence of signals ranging from the very weak to the extremely strong Dynamic range is specified in decibels and is typically over 100 dB

Figure 28-3

(c) the product detector in a receiver for SSB (d) the voltage regulator in a power supply (e) the AF oscillator in an AFSK transmitter 11 When the bias in an FET stops the flow of current, the condition is called (a) forward breakover (b) cutoff (c) reverse bias (d) pinchoff (e) avalanche 12 The VA rating of a transformer is an expression of (a) the maximum frequency at which it can function (b) the type of core material it has (c) the voltage step-up or step-down ratio (d) the impedance transfer ratio (e) none of the above 13 In an N-type semiconductor, the minority carriers are (a) electrons (b) protons (c) holes (d) neutrons (e) positrons 14 A disadvantage of a half-wave rectifier is the fact that (a) the output voltage is excessive compared to that of a full-wave rectifier (b) the output current is excessive compared to that of a full-wave rectifier (c) the output waveform is harder to filter than is the case with a full-wave rectifier (d) it requires several expensive diodes, whereas a full-wave rectifier requires only a single cheap diode (e) it requires an expensive center-tapped transformer, whereas a full-wave rectifier does not need a transformer at all 15 A power gain of 30 dB is equivalent to which amplification factor (a) 0001 (b) 1 30 (c) 30 (d) 1000 (e) None of the above

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