radio signal transmission

Attenuation is undesirable because it reduces signal strength at the receiver. More serious, however, is distortion interference, and noise, which appear as alternations of the signal shape. Although such contaminations may occur at any point, the standard convention is to..

These are commonly used in power distribution (at low frequencies) and in communications (at high frequencies). Biodiversity is most simply defined as the variety of life and its processes. A transmission line may be defined as a device for transmitting or guiding energy from one point t..

Hz (audio-frequency range) 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 con..

There are mainly two types of synapses. Electrical and Chemical depending upon the nature of transfer of information across the synapse a) In electrical synapses, the cells are separated by a gap, the synaptic cleft of only 0.2 nm and there are specialised for rapid signal transmissi..

. The literal meaning of the modulation is "to change". In modulation, some characteristic of carrier wave is changed in accordance with the intensity (i.e., amplitude) of the signal. The resultant wave is called modulated ware or radio wave and contains the audio signal..

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 modula..

The AM radio waves which propagate from one point to another following the surface of Earth are known as ground waves or surface waves. This type of propagation is called ground wave propagation or surface wave propagation. In ground wave transmission, the intensity of the ..

. A good quality service can be continuously ensured by a global operational satellite system. Thus, communication satellites would give a valuable service in addition to the submarine cable and high frequency radio systems. Geostationary communication satellites have enabled not only nat..

The Doppler effect provides a convenient means of tracking a satellite that is emitting a radio signal of constant frequency. The frequency of the signal received on the Earth changes as the satellite is passin..