Quiz 5

What is the use of the band pass filter in the receiver section?

• Protects the receiver

• b) Increases antenna gain

• c) Reduces noise

• d) To reduce it to an intermediate frequency

In Rf tuning, what is the first local oscillator?

• Frequency synthesizer

• Quartz oscillator

• Magnetic oscillator

• Electric oscillators

If the earth station downlink signal received is at f_S = 4.08 GHz, what first stage local-oscillator frequency f_LO is needed to achieve IF of 770 MHz?

• 3310 MHz

• 4080 MHz

• 1203 MHz

• 3250 MHz

Which of the following amplifiers is used in the transmitter substation?

• RF amplifiers

• Buffer amplifiers

• Klystron amplifier

• 1. Operational amplifiers

Which part of the transmitter subsystem modulates the baseband signal?

• Antenna

• Up converter

• Power amplifiers

• Mixer

The satellite in the earth station must be steerable even for a geosynchronous satellite.

• True

• False

In digital systems, analog signals are first digitized with PCM converters before modulation.

• True

• False

In RF tuning, _________ provides the final up conversion to the microwave frequency?

• Fixed-frequency local oscillator

• RF frequency synthesizer

• Quartz oscillator

• Magnetic oscillator

When individual up converters are used to modulate a channel, what is used to combine them into final signal?

• Microwave combiner

• Multiplexer

• Mixer

• Amplifier

What is number of transponders if the satellite uses 12 channels of frequency and frequency reuse is implemented

• 3

• 6

• 12

• 24