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Subel. ZLD
30 questions
Subelement ZLD
The Radio Receiver
Section ZLD17
Receiver Operation
The frequency stability of a receiver is its ability to
  • Correct Answer
    stay tuned to the desired signal
  • track the incoming signal as it drifts
  • provide a frequency standard
  • provide a digital readout
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The sensitivity of a receiver specifies
  • the bandwidth of the RF preamplifier
  • the stability of the oscillator
  • Correct Answer
    its ability to receive weak signals
  • its ability to reject strong signals
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Of two receivers, the one capable of receiving the weakest signal will have
  • an RF gain control
  • Correct Answer
    the least internally-generated noise
  • the loudest audio output
  • the greatest tuning range
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The figure in a receiver's specifications which indicates its sensitivity is the
  • bandwidth of the IF in kilohertz
  • audio output in watts
  • Correct Answer
    signal plus noise to noise ratio
  • number of RF amplifiers
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If two receivers are compared, the more sensitive receiver will produce
  • more than one signal
  • less signal and more noise
  • Correct Answer
    more signal and less noise
  • a steady oscillator drift
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The ability of a receiver to separate signals close in frequency is called its
  • noise figure
  • sensitivity
  • bandwidth
  • Correct Answer
    selectivity
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A receiver with high selectivity has a
  • wide bandwidth
  • wide tuning range
  • Correct Answer
    narrow bandwidth
  • narrow tuning range
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The BFO in a superhet receiver operates on a frequency nearest to that of its
  • RF amplifier
  • audio amplifier
  • local oscillator
  • Correct Answer
    IF amplifier
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To receive Morse code signals, a BFO is employed in a superhet receiver to
  • produce IF signals
  • beat with the local oscillator signal to produce sidebands
  • produce an audio tone to beat with the IF signal
  • Correct Answer
    beat with the IF signal to produce an audio tone
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The following transmission mode is usually demodulated by a product detector
  • pulse modulation
  • double sideband full carrier modulation
  • frequency modulation
  • Correct Answer
    single sideband suppressed carrier modulation
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A superhet receiver for SSB reception has an insertion oscillator to
  • Correct Answer
    replace the suppressed carrier for detection
  • phase out the unwanted sideband signal
  • reduce the passband of the IF stages
  • beat with the received carrier to produce the other sideband
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A stage in a receiver with input and output circuits tuned to the received frequency is the
  • Correct Answer
    RF amplifier
  • local oscillator
  • audio frequency amplifier
  • detector
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An RF amplifier ahead of the mixer stage in a superhet receiver
  • enables the receiver to tune a greater frequency range
  • means no BFO stage is needed
  • makes it possible to receive SSB signals
  • Correct Answer
    increases the sensitivity of the receiver
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A communication receiver may have several IF filters of different bandwidths. The operator selects one to
  • improve the S-meter readings
  • improve the receiver sensitivity
  • Correct Answer
    improve the reception of different types of signal
  • increase the noise received
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The stage in a superhet receiver with a tuneable input and fixed tuned output is the
  • RF amplifier
  • Correct Answer
    mixer stage
  • IF amplifier
  • local oscillator
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The mixer stage of a superhet receiver
  • produces spurious signals
  • Correct Answer
    produces an intermediate frequency signal
  • acts as a buffer stage
  • demodulates SSB signals
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A 7 MHz signal and a 16 MHz oscillator are applied to a mixer stage. The output will contain the input frequencies and
  • 8 and 9 MHz
  • 7 and 9 MHz
  • Correct Answer
    9 and 23 MHz
  • 3.5 and 9 MHz
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Selectivity in a superhet receiver is achieved primarily in the
  • RF amplifier
  • Mixer
  • Correct Answer
    IF amplifier
  • Audio stage
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The abbreviation AGC means
  • attenuating gain capacitor
  • Correct Answer
    automatic gain control
  • anode-grid capacitor
  • amplified grid conductance
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The AGC circuit in a receiver usually controls the
  • audio stage
  • mixer stage
  • power supply
  • Correct Answer
    RF and IF stages
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The tuning control of a superhet receiver changes the tuned frequency of the
  • audio amplifier
  • IF amplifier
  • Correct Answer
    local oscillator
  • post-detector amplifier
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A superhet receiver, with an IF at 500 kHz, is receiving a 14 MHz signal. The local oscillator frequency is
  • Correct Answer
    14.5 MHz
  • 19 MHz
  • 500 kHz
  • 28 MHz
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An audio amplifier is necessary in an AM receiver because
  • Correct Answer
    signals leaving the detector are weak
  • the carrier frequency must be replaced
  • the signal requires demodulation
  • RF signals are not heard by the human ear
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The audio output transformer in a receiver is required to
  • step up the audio gain
  • protect the loudspeaker from high currents
  • improve the audio tone
  • Correct Answer
    match the output impedance of the audio amplifier to the speaker
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If the carrier insertion oscillator is counted, then a single conversion superhet receiver has
  • one oscillator
  • Correct Answer
    two oscillators
  • three oscillators
  • four oscillators
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A superhet receiver, with a 500 kHz IF, is receiving a signal at 21.0 MHz. A strong unwanted signal at 22 MHz is interfering. The cause is
  • insufficient IF selectivity
  • the 22 MHz signal is out-of-band
  • Correct Answer
    22 MHz is the image frequency
  • insufficient RF gain
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A superhet receiver receives an incoming signal of 3540 kHz and the local oscillator produces a signal of 3995 kHz. The IF amplifier is tuned to
  • Correct Answer
    455 kHz
  • 3540 kHz
  • 3995 kHz
  • 7435 kHz
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A double conversion receiver designed for SSB reception has a carrier insertion oscillator and
  • one IF stage and one local oscillator
  • two IF stages and one local oscillator
  • Correct Answer
    two IF stages and two local oscillators
  • two IF stages and three local oscillators
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An advantage of a double conversion receiver is that it
  • does not drift off frequency
  • produces a louder audio signal
  • Correct Answer
    has improved image rejection characteristics
  • is a more sensitive receiver
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A receiver squelch circuit
  • automatically keeps the audio output at maximum level
  • Correct Answer
    silences the receiver speaker during periods of no received signal
  • provides a noisy operating environment
  • is not suitable for pocket-size receivers
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