What circuit is used to select one of the sidebands from a balanced modulator?

1. A Carrier oscillator
2. B Filter
3. C IF amplifier
4. D RF amplifier

What output is produced by a balanced modulator?

1. A Frequency modulated RF
2. B Audio with equalized frequency response
3. C Audio extracted from the modulation signal
4. D Double-sideband modulated RF

What is one reason to use an impedance matching transformer at a transmitter output?

1. A To minimize transmitter power output
2. B To present the desired impedance to the transmitter and feed line
3. C To reduce power supply ripple
4. D To minimize radiation resistance

How is a product detector used?

1. A Used in test gear to detect spurious mixing products
2. B Used in a transmitter to perform frequency multiplication
3. C Used in an FM receiver to filter out unwanted sidebands
4. D Used in a single sideband receiver to extract the modulated signal

Which of the following is characteristic of a direct digital synthesizer (DDS)?

1. A Extremely narrow tuning range
2. B Relatively high-power output
3. C Pure sine wave output
4. D Variable output frequency with the stability of a crystal oscillator

Which of the following is an advantage of a digital signal processing (DSP) filter compared to an analog filter?

1. A A wide range of filter bandwidths and shapes can be created
2. B Fewer digital components are required
3. C Mixing products are greatly reduced
4. D The DSP filter is much more effective at VHF frequencies

What term specifies a filter's attenuation inside its passband?

1. A Insertion loss
2. B Return loss
3. C Q
4. D Ultimate rejection

Which parameter affects receiver sensitivity?

1. A Input amplifier gain
2. B Demodulator stage bandwidth
3. C Input amplifier noise figure
4. D All these choices are correct

What is the phase difference between the I and Q RF signals that software-defined radio (SDR) equipment uses for modulation and demodulation?

1. A Zero
2. B 90 degrees
3. C 180 degrees
4. D 45 degrees

What is an advantage of using I-Q modulation with software-defined radios (SDRs)?

1. A The need for high resolution analog-to-digital converters is eliminated
2. B All types of modulation can be created with appropriate processing
3. C Minimum detectible signal level is reduced
4. D Automatic conversion of the signal from digital to analog

Which of these functions is performed by software in a software-defined radio (SDR)?

1. A Filtering
2. B Detection
3. C Modulation
4. D All these choices are correct

What is the frequency above which a low-pass filter's output power is less than half the input power?

1. A Notch frequency
2. B Neper frequency
3. C Cutoff frequency
4. D Rolloff frequency

What term specifies a filter's maximum ability to reject signals outside its passband?

1. A Notch depth
2. B Rolloff
3. C Insertion loss
4. D Ultimate rejection

The bandwidth of a band-pass filter is measured between what two frequencies?

1. A Upper and lower half-power
2. B Cutoff and rolloff
3. C Pole and zero
4. D Image and harmonic