radio broadcasting systems

Communication Systems..

) cannot be efficiently radiated and do not propagate well in space. (ii) Simultaneous transmission of different signals by different transmitters would lead to confusion at the receiver. In order to solve these problems; we need to devise methods to convert or translate the audio signals to the ..

Importance of Radio Waves in Modern Communication - Radio waves are electromagnetic waves of wavelength 10 - 3 m and higher. Their frequency range is from a few kHz to nearly a few hundred MHz. The propagation of radio waves through the atmosphere is relevant in all mo..

Elements of a Communication System..

3. A radio station broadcasts on a frequency of 980 kHz (kilohertz). What is the electromagnetic radiation broadcasted by the radio statio..

(the portion of the atmosphere closest to the ground). Frequencies below the HF range travel around the curvature of the Earth, sometimes right around the globe. These ground waves, or surface waves as they are called, are one of the two original means of beyond- the- horizon propagation. All ..

is contamination by extraneous signals from human sources, other transmitters, power lines and machinery, switching circuits, etc. Interference occurs most often in radio systems whose receiving antennas usually intercept several signals at the same time. Radio-freque..

The frequency of the radiation emitted is = 980 kHz = 980 x 10 3 Hz = 980 x 10 3 s - 1 c = 3.0 x 10 8 ms - 1 The radio station broadcasts electromagnetic radiation of wavelength = 306m 4. Name the different types of radiations present in the electromagnetic spectrum ..

Need for Frequency Modulation - (i) Various electrical machines and noises cause amplitude disturbance in the transmission of amplitude-modulated wave. This makes the reception noisy. So, there is a need for different type of modulation, which can reduce the noise factor. Frequency modulation (FM) ..