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Subelement ZLE
The Radio Transmitter
Section ZLE18
Transmitter Block Diagrams
In the transmitter block diagram shown, the "oscillator"
  • is variable in frequency
  • generates an audio frequency tone during tests
  • Correct Answer
    uses a crystal for good frequency stability
  • may have a calibrated dial
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In the transmitter block diagram shown, the "balanced modulator"
  • balances the high and low frequencies in the audio signal
  • Correct Answer
    performs double sideband suppressed carrier modulation
  • acts as a tone control
  • balances the standing wave ratio
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In the transmitter block diagram shown, the "filter"
  • removes mains hum from the audio signal
  • suppresses unwanted harmonics of the RF signal
  • Correct Answer
    removes one sideband from the modulated signal
  • removes the carrier component from the modulated signal
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In the transmitter block diagram shown, the "mixer"
  • adds the correct proportion of carrier to the SSB signal
  • mixes the audio and RF signals in the correct proportions
  • Correct Answer
    translates the SSB signal to the required frequency
  • mixes the two sidebands in the correct proportions
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In the transmitter block diagram shown, the "linear amplifier"
  • has all components arranged in-line
  • Correct Answer
    amplifies the modulated signal with no distortion
  • aligns the two sidebands correctly
  • removes any unwanted amplitude modulation from the signal
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In the transmitter block diagram shown, the "VFO" is
  • a voice frequency oscillator
  • a varactor fixed oscillator
  • a virtual faze oscillator
  • Correct Answer
    a variable frequency oscillator
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In the transmitter block diagram shown, the "master oscillator" produces
  • Correct Answer
    a steady signal at the required carrier frequency
  • a pulsating signal at the required carrier frequency
  • a 800 Hz signal to modulate the carrier
  • a modulated CW signal
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In the transmitter block diagram shown, the "driver buffer"
  • filters any sharp edges from the input signal
  • drives the power amplifier into saturation
  • Correct Answer
    provides isolation between the oscillator and power amplifier
  • changes the frequency of the master oscillator signal
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In the transmitter block diagram shown, the "Morse key"
  • turns the DC power to the transmitter on and off
  • Correct Answer
    allows the oscillator signal to pass only when the key is depressed
  • changes the frequency of the transmitted signal when the key is depressed
  • adds an 800 Hz audio tone to the signal when the key is depressed
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In the transmitter block diagram shown, the "power amplifier"
  • Correct Answer
    need not have linear characteristics
  • amplifies the bandwidth of its input signal
  • must be adjusted during key-up conditions
  • should be water-cooled
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In the transmitter block diagram shown, the "speech amplifier"
  • Correct Answer
    amplifies the audio signal from the microphone
  • is a spectral equalization entropy changer
  • amplifies only speech, while discriminating against background noises
  • shifts the frequency spectrum of the audio signal into the RF region
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In the transmitter block diagram shown, the "modulator"
  • is an amplitude modulator with feedback
  • is an SSB modulator with feedback
  • causes the speech waveform to gate the oscillator on and off
  • Correct Answer
    causes the speech waveform to shift the frequency of the oscillator
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In the transmitter block diagram shown, the "oscillator" is
  • an audio frequency oscillator
  • Correct Answer
    a variable frequency RF oscillator
  • a beat frequency oscillator
  • a variable frequency audio oscillator
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In the transmitter block diagram shown, the "frequency multiplier"
  • translates the frequency of the modulated signal into the RF spectrum
  • changes the frequency of the speech signal
  • Correct Answer
    produces a harmonic of the oscillator signal
  • multiplies the oscillator signal by the speech signal

The Frequency Multiplier stage is an RF amplifier with a tuned output - the output tuned to a harmonic of the input signal.

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In the transmitter block diagram shown, the "power amplifier"
  • increases the voltage of the mains to drive the antenna
  • amplifies the audio frequency component of the signal
  • amplifies the selected sideband to a suitable level
  • Correct Answer
    amplifies the RF signal to a suitable level
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The signal from an amplitude modulated transmitter consists of
  • Correct Answer
    a carrier and two sidebands
  • a carrier and one sideband
  • no carrier and two sidebands
  • no carrier and one sideband
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The signal from a frequency modulated transmitter has
  • an amplitude which varies with the modulating waveform
  • Correct Answer
    a frequency which varies with the modulating waveform
  • a single sideband which follows the modulating waveform
  • no sideband structure
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The signal from a balanced modulator consists of
  • a carrier and two sidebands
  • a carrier and one sideband
  • Correct Answer
    no carrier and two sidebands
  • no carrier and one sideband
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The signal from a CW transmitter consists of
  • a continuous, unmodulated RF waveform
  • a continuous RF waveform modulated with an 800 Hz Morse signal
  • Correct Answer
    an RF waveform which is keyed on and off to form Morse characters
  • a continuous RF waveform which changes frequency in synchronism with an applied Morse signal
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The following signal can be amplified using a non-linear amplifier
  • SSB
  • Correct Answer
    FM
  • AM
  • DSBSC
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