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How does sky propagation differ from line-of-sight propagation?
Wiki User
∙ 13y ago
Electromagnetic waves - radio waves - propagate through the air and vacuum by altering the electro-magnetic (EM) properties of space. They will be reflected whenever the EM properties of the space change. Incoming radiation from the sun partly ionizes some of the air molecules in the upper atmosphere and, for some frequencies, this will reflect (or refract) the EM signal.
This allows the EM signal to be reflected over long distances - even around the world - multiple hops. This effect is only true for HF radio - frequencies up to 10MHz or so. And varies naturally, day and night.
A related phenomenon affecting the upper atmosphere, is that incoming meteorites may give temporary ionization tracks. These have been used for burst transmissions but are not suitable for broadcast communications.
Higher frequencies, 100 MHz or so, use line - of - sight transmission, for these high frequencies are not affected by the ionized layers.
Wiki User
∙ 13y ago
Sky propagation involves radio waves reflecting off the Earth's ionosphere to reach a receiver beyond the horizon, whereas line-of-sight propagation involves radio waves traveling in a straight path from the transmitter to the receiver without any obstacles in between. Sky propagation is typically used for long-distance communications, while line-of-sight propagation is more commonly used for shorter distances.
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How does natural vegetative propagation differ from artificial vegetative propagation?
bla bla bla
What is the different modes of the radio wave propagation?
Ground wave, sky wave and space wave propagation
What is skywave propagation?
the propagation in which transmission and receiving of signals takesplace through the sky waves which having the lower frequency
What are the applications of sky wave propagation?
what do you think (question mark)
What is in the sky starting with a c can differ in sizeshape and color?
Clouds
How do available stars differ from other stars in the sky?
The available ones are above the horizon in a dark sky. The other ones are unavailable.
Why do short wave broadcast services use sky wave propagation?
They can bounce (be deflected) by the ionosphere to (possibly) circle the globe. Other frequencies are limited to line of sight.
Definition of guided unguided media?
The unguided media is the wireless media. It simply transports electromagnetic waves without using any physical conductor. Signals are normally broadcast through the air and thus are available to any one who has the device capable of receiving them. Unguided signals can be travelled from source to the destination in several ways. These ways include ground propagation, sky propagation and line of sight propagation.
What type of propagation is used in telephone communication?
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When was Propagation - album - created?
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Electromagnetic waves differ from each other in?
wavelength & frequency (but remember frequency is only a derivative of wavelength for any given propagation velocity) 'Amplitude' also varies (bigger waves!)
What is advantage of using this type of propagation?
propagation is the type of how the plant reproduce
