Wireless local-area networks occupy which of the following segments?
What is microwave and SHF
100
A circuit that rejects or stops frequencies over a narrow range but allows frequencies above and below to pass is the ____________
What is band-reject filter
100
In amplitude modulation(100%), how much of the transmitted power is in the carrier?
What is two-thirds
100
Circuits that accept modulated signals and recover the original modulating information are called ______
What is demodulator
100
The measure of noise is usually expressed in terms of the _______________
What is signal to noise ratio
200
The difference between the upper and lower frequency limits of a signal or the equipment operation range is the
What is bandwidth
200
The rate of change of amplitude with frequency in a filter is the ____________
What is roll-off
200
The relationship between the amplitude of the modulating signal and the amplitude of the carrier is known as the _______________.
What is modulation index
200
The simplest and most widely used method of generating SSB signals is the _______________ .
What is filter method
200
In AM, it is particularly important that the peak value of the modulating signal be _______ the peak value of the carrier.
What is less than
300
Signals generated at frequencies above and below a carrier frequency by an amount equal to the modulating frequency are called
What is sidebands
300
When two or more stages of amplification (not in dB) are cascaded, the overall gain of the combination is the _______________ of the individual circuit gains.
What is product
300
Double-sideband suppressed carrier signals are generated by a circuit called a
What is balanced modulator
300
The 1496/1596 IC balanced modulator can work at carrier frequencies up to approximately _______________ MHz.
What is 100
300
__________________________ is a special form of a crystal filter designed to provide the exact selectivity required by a given application.
What is surface acoustic wave (SAW) filter
400
Which of the following is not a duplex type communication system?
A. telephones
B. sonar
C. telemetry
D. Internet
What is C. telemetry
400
An important characteristic of an inductor is the ratio of inductive power to resistive power referred to as its _______________ .
What is Quality Factor
400
Amplitude modulation by square waves or rectangular binary pulses is referred to as _______
What is amplitude-shift keying
400
In high-level AM, the modulator varies the voltage and power in the _________
What is final RF amplifier
400
56. In a parallel resonant circuit at resonance, impedance is_______________and current is ________________.
What is maximum, minimum
500
The _______________ region is between the highest radio frequencies and the visible portion of the electromagnetic spectrum.
What is Infrared
500
___________ also known as a Thomson filter provides the desired frequency response, but has a constant time delay in the passband.
What is Bessel
500
What is the low-level carrier called that is sometimes transmitted along with the two sidebands in DSB or in SSB?
What is pilot carrier
500
What percentage of the power can be saved for SSB if the modulation index is 90%?