Q. Which of the following transponders convert the uplink signal to downlink signal using two mixers

View solution

Q. In a regenerative transponder, the signal is demodulated and modulated again before transmission.

View solution

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

View solution

Q. Why is it not possible to provide transmit function by wideband amplifier and mixer circuits?

View solution

Q. Which of the following is not true?

View solution

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

View solution

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

View solution

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

View solution

Q. In Rf tuning, what is the first local oscillator?

View solution

Q. 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?

View solution

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

View solution

Q. Which part of the transmitter subsystem modulates the baseband signal?

View solution

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

View solution

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

View solution

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

View solution

Q. What is the primary use of communication satellites?

View solution

Q. Which of the following is not a reason for redistributing TV signals through satellites rather than skywaves or spacewaves?

View solution

Q. What type of satellite TV service uses compressed data transmission to beam signals directly to every home?

View solution

Q. Which frequency band does the direct broadcast satellite system use?

View solution

Q. What technique does DSP use to double the number of channels by using helical antennas?

View solution