Satellite Communications

The transmitter-receiver combination in the satellite is known as a _______

• Duplexer

• Transponder

• Repeater

• Relay

The downlink frequency is lower than the uplink frequency.

• True

• False

Satellite signals are refracted by the ionosphere.

• True

• False

Which of the following is not a satellite subsystem?

• Ground station

• Power system

• Telemetry tracking

• Communication subsystem

Which of the following is not a part of the propulsion subsystem of a satellite?

• Gyroscope

• Jet thruster

• AKM

• Fuel control system

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

• 12

• 24

Telemetry, command, and control (TC&C) subsystem allow a ground station to monitor and control conditions in the satellite.

• True

• False

Which technique uses two different antennas to reduce traffic on the same frequency?

• Spatial isolation

• Frequency reuse

• Multiplexing

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

• 3310 MHz

• 4080 MHz

• 1203 MHz

• 3250 MHz

The multiple access technique suitable only for digital transmission is

• TDMA

• FDMA