What technique does DSP use to double the number of channels by using helical antennas?(a) Spatial isolation(b) Frequency reuse(c) Multiplexing(d) Modulation

What technique does DSP use to double the number of channels by using

1.	What technique does DSP use to double the number of channels by using helical antennas?(a) Spatial isolation(b) Frequency reuse(c) Multiplexing(d) Modulation
Answer» Correct option is (b) Frequency reuse The explanation is: The digital signal is transmitted from the satellite to the receivers using circular polarization. The DBS satellites have right-hand and left-hand circularly polarized (RHCP and LHCP) helical antennas. By transmitting both polarities of signal, frequency reuse can be incorporated to double the channel capacity.

Discussion

No Comment Found

Related InterviewSolutions

What is the spectral separation between each satellite L1 signal in the GLONASS?(a) 50kHz(b) 2MHz(c) 1240MHz(d) 562.5kHz
What are the frequency channels that GLONASS use for normal operation?(a) i=-7 to +4(b) i=+5 to +12(c) i=-7 to +12(d) i=-2 to +7
Sculling errors occur when rotation and acceleration are combined.(a) True(b) FalseI have been asked this question by my school teacher while I was bunking the class.The origin of the question is Strap Down and Gimballed Inertial Navigation Systems topic in portion Satellite Radio Navigation & Inertial Navigation of Avionics
The input, output and spin axes of a gyro are always perpendicular to each other.(a) True(b) FalseThis question was addressed to me in exam.This interesting question is from Gyroscopes topic in portion Satellite Radio Navigation & Inertial Navigation of Avionics
What is the basic principle under which MEMS gyro work?(a) Sagnag effect(b) Coriolis effect(c) Angular momentum conservation(d) Mass conservation
Which of the following is false with respect to gimballed platform?(a) Orients the accelerometers into a coordinate frame relative to Earth(b) Euler angles are not easily readable from the gimbals(c) Protect the instruments from large angular motion(d) Protection from vibration, temperature and magnetic effects.
Which of the following factors affect the ability of a stable element to remain non-rotating relative to space?(a) Drift rate of the reference gyro(b) Accuracy of gyro torquer(c) Linear motion of the vehicle(d) Orthogonality of the components on the platform
Which of the following antennas produce a vertical radiation pattern?(a) Dipole antenna(b) Yagi antenna(c) Marconi antenna(d) Hertz antenna
Which of the following cause multi path signals?(a) Low transmission power(b) Ground reflection(c) Low frequency transmission(d) High frequency transmission
What is the number of beams that a Doppler radar uses?(a) 4(b) 2(c) 1(d) 3

What technique does DSP use to double the number of channels by using helical antennas?(a) Spatial isolation(b) Frequency reuse(c) Multiplexing(d) Modulation

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment