E8A Fourier analysis; RMS measurements; average RF power and peak envelope power (PEP); analog/digital conversion

- [[E8A01]] (A)
What technique shows that a square wave is made up of a sine wave and its odd harmonics? #card
	- [[A.]] Fourier analysis
	- [[B.]] Vector analysis
	- [[C.]] Numerical analysis
	- [[D.]] Differential analysis
- [[E8A02]] (A)
Which of the following is a type of analog-to-digital conversion? #card
	- [[A.]] Successive approximation
	- [[B.]] Harmonic regeneration
	- [[C.]] Level shifting
	- [[D.]] Phase reversal
- [[E8A03]] (B)
Which of the following describes a signal in the time domain? #card
	- [[A.]] Power at intervals of phase
	- [[B.]] Amplitude at different times
	- [[C.]] Frequency at different times
	- [[D.]] Discrete impulses in time order
- [[E8A04]] (B)
What is “dither” with respect to analog-to-digital converters? #card
	- [[A.]] An abnormal condition where the converter cannot settle on a value to represent the signal
	- [[B.]] A small amount of noise added to the input signal to reduce quantization noise
	- [[C.]] An error caused by irregular quantization step size
	- [[D.]] A method of decimation by randomly skipping samples
- [[E8A05]] (D)
What is the benefit of making voltage measurements with a true-RMS calculating meter? #card
	- [[A.]] An inverse Fourier transform can be used
	- [[B.]] The signal’s RMS noise factor is also calculated
	- [[C.]] The calculated RMS value can be converted directly into phasor form
	- [[D.]] RMS is measured for both sinusoidal and non-sinusoidal signals
- [[E8A06]] (A)
What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal? #card
	- [[A.]] 2.5 to 1
	- [[B.]] 25 to 1
	- [[C.]] 1 to 1
	- [[D.]] 13 to 1
- [[E8A07]] (B)
What determines the PEP-to-average power ratio of an unprocessed single-sideband phone signal? #card
	- [[A.]] The frequency of the modulating signal
	- [[B.]] Speech characteristics
	- [[C.]] The degree of carrier suppression 
	- [[D.]] Amplifier gain
- [[E8A08]] (C)
Why are direct or flash conversion analog-to-digital converters used for a software defined radio? #card
	- [[A.]] Very low power consumption decreases frequency drift
	- [[B.]] Immunity to out-of-sequence coding reduces spurious responses
	- [[C.]] Very high speed allows digitizing high frequencies
	- [[D.]] All these choices are correct
- [[E8A09]] (D)
How many different input levels can be encoded by an analog-to-digital converter with 8-bit resolution? #card
	- [[A.]] 8
	- [[B.]] 8 multiplied by the gain of the input amplifier
	- [[C.]] 256 divided by the gain of the input amplifier
	- [[D.]] 256
- [[E8A10]] (C)
What is the purpose of a low-pass filter used at the output of a digital-to-analog converter? #card
	- [[A.]] Lower the input bandwidth to increase the effective resolution
	- [[B.]] Improve accuracy by removing out-of-sequence codes from the input
	- [[C.]] Remove spurious sampling artifacts from the output signal
	- [[D.]] All these choices are correct
- [[E8A11]] (A)
Which of the following is a measure of the quality of an analog-to-digital converter? #card
	- [[A.]] Total harmonic distortion
	- [[B.]] Peak envelope power
	- [[C.]] Reciprocal mixing
	- [[D.]] Power factor