Volume 2 STQ Flashcards
What component converts audio signal into radio signal?
A transmitter
What communications component radiates energy into space?
An antenna
What communication component converts modulated radio signal into audio signal?
A receiver
What communication component carries radio frequency power from antenna to receiver?
Transmission lines
What communication component carries radio signal from a transmitter to an antenna?
Transmission lines
What does a transmitter require for success?
The ability to produce a stable carrier frequency and amplitude without creating undesirable by products, such as noise, harmonics, and spurious outputs
What modulation component consists of only one sideband?
Single Sideband
What modulation type is used for systems incorporating time-division multiplexing?
Phase modulation
In what type of modulation is the phase of the frequency shifted?
Phase shift keying
In what type of modulation does the amplitude of the carrier vary at the audio rate?
Amplitude modulation
What type of modulation is commonly used in radio teletype applications?
Frequency shift keying
In what type of modulation is the frequency of the carrier wave varied?
Frequency modulation
What are the five functions of a communication receiver?
Reception, selection, detection, amplification, and reproduction
What are selectivity and sensitivity?
Sensitivity is the quality of a receiver’s ability to sense and reproduce a radio signal of low power, and selectivity is a receiver’s ability to select a single frequency band from a spectrum of frequencies. A receiver with high selectivity can receive a signal closely spaced on the frequency spectrum with other signals.
The transmitting antenna radiates energy into space in the form of what type of wave?
An electromagnetic wave
