Advertisements
Advertisements
Question
In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
Solution
In sky wave mode of propagation, the frequency range of transmitting signals restricted to less than 30 MHz, because it is the maximum frequency below which the signals can be transmitted from one point to another point via reflection from the ionosphere. Above this frequency, the signals will be transmitted through the ionosphere and are not reflected back.
APPEARS IN
RELATED QUESTIONS
Write a short note on surface wave propagation of electromagnetic waves.
(i) Which mode of propagation is used by shortwave broadcast services having frequency range from a few MHz upto 30 MHz? Explain diagrammatically how long distance communication can be achieved by this mode.
(ii) Why is there an upper limit to frequency of waves used in this mode?
Derive an expression for the maximum line of sight distance between two antennas for space wave propagation.
Explain why ground wave communication mode cannot be used for long-distance communication using high frequencies
The reflected waves from an ionosphere are _____.
(a) ground waves
(b) sky waves
(c) space waves
(d) very high-frequency waves
Is it necessary for a transmitting antenna to be at the same height as that of receiving antenna for LOS communication ?
Explain with the help of a diagram how long distance communication can be achieved by ionospheric reflection of radio waves.
What is ground wave communication? On what factors does the maximum range of propagation in this mode depend?
The frequency range of 3 MHz to 30 MHz is used for ____________.
The component of the ground wave attenuated by conducting earth is ______.
