communications

A communication system requires a sender (transmitter), a transmission line or channel (frequency), and a receiver. What do you call a communication system that sends and receives information?

• unidirectional

• amplitude modulated

• frequency modulated

• bidirectional

What do you call the frequency range of the sidebands around a carrier frequency?

• bandwidth

• message signal

• noise

• modulated frequency

Why can random noise be reduced better in FM than in an AM?

• FM produces less noise than AM

• FM signal amplitude variations do not contain the message signal, so the amplitude can be limited

• FM signals are propagated via the ionosphere

• In FM, frequency and amplitude deviations contain the message

The number of significant sideband pairs in an FM signal is a function of what parameter?

• a. bandwidth

• b. percentage of modulation

• c. MI

• d. center frequency

For an FM signal, what does the term frequency deviation mean?

• a the center frequency plus the modulation percentage

• b. the change in frequency from the center frequency

• c. the modulation index times the center frequency

• d the message signal frequency plus or minus the center frequency

What device removes the Lower Sideband (LSB) from a Double Sideband (DSB) signal?

• limiter

• filter

• detector

• mixer

What is the function of the RF power amplifier?

• It amplifies the message signal to the AM modulator.

• It amplifies the carrier signal to the AM modulator.

• It provides the power amplification for the antenna to radiate the RF signals over long distances.

• It sets the frequency range for the antenna RF signal.

The VCO-LO, PHASE MODULATOR, QUADRATURE DETECTOR, and PHASE-LOCKED LOOP circuit blocks possess what type of signals?

• Single Sideband (SSB) signals

• Double Sideband (DSB) signals

• Amplitude Modulated (AM) signals

• angle modulated signals

What are the functions of the VCO-LO and VCO-HI circuit blocks?

• mixing and demodulation

• message signal generation

• phase modulation

• oscillator signal generation

The VCO-LO, PHASE MODULATOR, QUADRATURE DETECTOR, and PHASE-LOCKED LOOP circuit blocks possess what type of signals?

• Single Sideband (SSB) signals

• Double Sideband (DSB) signals

• Amplitude Modulated (AM) signals

• angle modulated signals