79 lines
2.7 KiB
Markdown
79 lines
2.7 KiB
Markdown
T7A – Station equipment: receivers, transceivers, transmitter amplifiers, receive amplifiers, transverters; Basic radio circuit concepts and terminology: sensitivity, selectivity, mixers, oscillators, PTT, modulation
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- [[T7A01]] (B)
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Which term describes the ability of a receiver to detect the presence of a signal? #card
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- A. Linearity
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- B. Sensitivity
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- C. Selectivity
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- D. Total Harmonic Distortion
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- [[T7A02]] (A)
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What is a transceiver? #card
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- A. A device that combines a receiver and transmitter
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- B. A device for matching feed line impedance to 50 ohms
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- C. A device for automatically sending and decoding Morse code
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- D. A device for converting receiver and transmitter frequencies to another band
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- [[T7A03]] (B)
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Which of the following is used to convert a signal from one frequency to another? #card
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- A. Phase splitter
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- B. Mixer
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- C. Inverter
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- D. Amplifier
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- [[T7A04]] (C)
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Which term describes the ability of a receiver to discriminate between multiple signals? #card
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- A. Discrimination ratio
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- B. Sensitivity
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- C. Selectivity
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- D. Harmonic distortion
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- [[T7A05]] (D)
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What is the name of a circuit that generates a signal at a specific frequency? #card
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- A. Reactance modulator
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- B. Phase modulator
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- C. Low-pass filter
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- D. Oscillator
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- [[T7A06]] (C)
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What device converts the RF input and output of a transceiver to another band? #card
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- A. High-pass filter
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- B. Low-pass filter
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- C. Transverter
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- D. Phase converter
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- [[T7A07]] (B)
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What is the function of a transceiver’s PTT input? #card
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- A. Input for a key used to send CW
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- B. Switches transceiver from receive to transmit when grounded
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- C. Provides a transmit tuning tone when grounded
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- D. Input for a preamplifier tuning tone
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- [[T7A08]] (C)
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Which of the following describes combining speech with an RF carrier signal? #card
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- A. Impedance matching
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- B. Oscillation
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- C. Modulation
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- D. Low-pass filtering
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- [[T7A09]] (B)
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What is the function of the SSB/CW-FM switch on a VHF power amplifier? #card
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- A. Change the mode of the transmitted signal
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- B. Set the amplifier for proper operation in the selected mode
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- C. Change the frequency range of the amplifier to operate in the proper segment of the band
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- D. Reduce the received signal noise
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- [[T7A10]] (B)
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What device increases the transmitted output power from a transceiver? #card
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- A. A voltage divider
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- B. An RF power amplifier
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- C. An impedance network
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- D. All these choices are correct
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- [[T7A11]] (A)
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Where is an RF preamplifier installed? #card
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- A. Between the antenna and receiver
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- B. At the output of the transmitter power amplifier
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- C. Between the transmitter and the antenna tuner
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- D. At the output of the receiver audio amplifier
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