87 lines
3.4 KiB
Markdown
87 lines
3.4 KiB
Markdown
G7C – Transceiver design; filters; oscillators; digital signal processing (DSP)
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- [[G7C01]] (B)
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What circuit is used to select one of the sidebands from a balanced modulator? #card
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- A. Carrier oscillator
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- B. Filter
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- C. IF amplifier
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- D. RF amplifier
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- [[G7C02]] (D)
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What output is produced by a balanced modulator? #card
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- A. Frequency modulated RF
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- B. Audio with equalized frequency response
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- C. Audio extracted from the modulation signal
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- D. Double-sideband modulated RF
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- [[G7C03]] (B)
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What is one reason to use an impedance matching transformer at a transmitter output? #card
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- A. To minimize transmitter power output
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- B. To present the desired impedance to the transmitter and feed line
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- C. To reduce power supply ripple
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- D. To minimize radiation resistance
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- [[G7C04]] (D)
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How is a product detector used? #card
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- A. Used in test gear to detect spurious mixing products
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- B. Used in transmitter to perform frequency multiplication
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- C. Used in an FM receiver to filter out unwanted sidebands
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- D. Used in a single sideband receiver to extract the modulated signal
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- [[G7C05]] (D)
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Which of the following is characteristic of a direct digital synthesizer (DDS)? #card
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- A. Extremely narrow tuning range
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- B. Relatively high-power output
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- C. Pure sine wave output
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- D. Variable output frequency with the stability of a crystal oscillator
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- [[G7C06]] (A)
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Which of the following is an advantage of a digital signal processing (DSP) filter compared to an analog filter? #card
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- A. A wide range of filter bandwidths and shapes can be created
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- B. Fewer digital components are required
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- C. Mixing products are greatly reduced
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- D. The DSP filter is much more effective at VHF frequencies
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- [[G7C07]] (A)
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What term specifies a filter’s attenuation inside its passband? #card
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- A. Insertion loss
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- B. Return loss
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- C. Q
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- D. Ultimate rejection
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- [[G7C08]] (D)
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Which parameter affects receiver sensitivity? #card
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- A. Input amplifier gain
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- B. Demodulator stage bandwidth
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- C. Input amplifier noise figure
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- D. All these choices are correct
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- [[G7C09]] (B)
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What is the phase difference between the I and Q RF signals that software-defined radio (SDR) equipment uses for modulation and demodulation? #card
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- A. Zero
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- B. 90 degrees
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- C. 180 degrees
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- D. 45 degrees
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- [[G7C10]] (B)
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What is an advantage of using I-Q modulation with software-defined radios (SDRs)? #card
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- A. The need for high resolution analog-to-digital converters is eliminated
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- B. All types of modulation can be created with appropriate processing
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- C. Minimum detectible signal level is reduced
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- D. Automatic conversion of the signal from digital to analog
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- [[G7C11]] (D)
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Which of these functions is performed by software in a software-defined radio (SDR)? #card
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- A. Filtering
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- B. Detection
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- C. Modulation
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- D. All these choices are correct
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- [[G7C12]] (C)
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What is the frequency above which a low-pass filter’s output power is less than half the input power? #card
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- A. Notch frequency
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- B. Neper frequency
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- C. Cutoff frequency
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- D. Rolloff frequency
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- [[G7C13]] (D)
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What term specifies a filter’s maximum ability to reject signals outside its passband? #card
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- A. Notch depth
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- B. Rolloff
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- C. Insertion loss
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- D. Ultimate rejection
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- [[G7C14]] (A)
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The bandwidth of a band-pass filter is measured between what two frequencies? #card
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- A. Upper and lower half-power
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- B. Cutoff and rolloff
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- C. Pole and zero
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- D. Image and harmonic
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