A ground receiver station is receiving a signal at 5 MHz, transmitted from a ground transmitter at a distance of 200 km. Considering the surface wave propagation, what is the approximate height of the transmitting antenna required for efficient communication if the earth's radius is 6400 km?
96 m
192 m
384 m
768 m
Related Questions
The characteristic impedance parallel line wire is
Z₀ = (138/√εᵣ) log₁₀(D/2d)
Z₀ = (276/√εᵣ) log₁₀(2D/d)
Z₀ = (138/√εᵣ) log₁₀(2D/d)
Z₀ = (276/√εᵣ) log₁₀(D/2d)
A receiver reconstructs the original message after propagation through the channel.
May be true
May be false
May be true or false
Is certainly true
Major parts of a communication system are
Transmitter and receiver
Receiver and communication channel
Transmitter and communication channel
Transmitter, receiver and communication channel
Basically, a communication system is a
system for transmitting information
device used for sending messages
method of encoding data
collection of interconnected networks
A laser is a coherent source it contains
Many wavelength
Uncoordinated waves of particular wavelength
Coordinated waves of many wavelength
Coordinated waves of particular wavelength
The bit rate for a signal, which has a sampling rate of 8 kHz and where 16 quantisation levels have been used is
32000 bits/s
16000 bits/s
64000 bits/s
72000 bits/s
The characteristic impedance of free space is
120π Ω
377 Ω
√3/2 Ω
300 Ω
When is the modulation frequency in frequency modulation, the modulation index is proportional to
A message signal of frequency 10 kHz and peak voltage 10 V is used to modulate a carrier wave of frequency 1 MHz and peak voltage 20 V. If the modulation index is 0.5, what is the peak voltage of the upper sideband?
2.5 V
5 V
10 V
20 V
In ruby laser, the stimulated emission is due to transition from
Ground state to excited state
Metastable state to ground state
Excited state to metastable state
Ground state to metastable state
