2015-G7C: Receivers and transmitters; filters, oscillators
Which of the following is used to process signals from the balanced modulator then send them to the mixer in some single sideband phone transmitters?
Which circuit is used to combine signals from the carrier oscillator and speech amplifier then send the result to the filter in some single sideband phone transmitters?
What circuit is used to process signals from the RF amplifier and local oscillator then send the result to the IF filter in a superheterodyne receiver?
What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in some single sideband receivers?
Which of the following is an advantage of a transceiver controlled by a direct digital synthesizer (DDS)?
Variable frequency with the stability of a crystal oscillator
Wide tuning range and no need for band switching
Relatively high power output
Relatively low power consumption
What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?
About the same
Twice the transmission line impedance
What is the simplest combination of stages that implement a superheterodyne receiver?
HF oscillator, mixer, detector
RF amplifier, detector, audio amplifier
RF amplifier, mixer, IF discriminator
HF oscillator, prescaler, audio amplifier
What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?
Which of the following is needed for a Digital Signal Processor IF filter?
All of the these choices are correct
An analog to digital converter
A digital to analog converter
A digital processor chip
How is Digital Signal Processor filtering accomplished?
By converting the signal from analog to digital and using digital processing
By using direct signal phasing
By differential spurious phasing
By converting the signal from digital to analog and taking the difference of mixing products
What is meant by the term "software defined radio" (SDR)?
A radio in which most major signal processing functions are performed by software
A radio that provides computer interface for automatic logging of band and frequency
A radio that uses crystal filters designed using software
A computer model that can simulate performance of a radio to aid in the design process
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