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