school for radio broadcasting

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 ..

Channel A broadcasts news for every 4 hours and channel B broadcasts news for every 6 hours. If both the channels start broadcasting news now, then after how many hours will they start broadcasting news at the same time? => 24 hours or 20 hours or 18 hours or..

Radio Carbon Dating - Radiocarbon The 1 4 C so produced is eventually converted into CO 2 , which in turn is incorporated into plants and trees by the process of photosynthesis and then finds way into animals, which eat pla..

Radiocarbon dating of historical wooden - derived objects is based on the knowledge that the cosmic ray intensity (responsible for 1 4 C production) has been practically constant for thousands of years. 1 4 C is formed in the upper atmosphere by the action of cosmic radiation on 1 4 N..

Let us now discuss the basic principles of wireless radio communications. We shall mainly concentrate on the principle of amplitude modulation and demodulatio..

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..

The bar graph shows the number of radios sold in each price range in a city. Find the total number of radios sold. => 65 or 70 or 60 or 55..

A certain radio active isotope has half - life of 20 days. If one starts with 80 kg of the isotope, then how much is left after 8 days? => 60 kg or 36 kg or 42 kg or 32 kg or 38 kg..

Radio tubes manufactured by a company are expected to have a mean lifetime of 400 hours, with a standard deviation of 30 hours. Random samples of 10 tubes were tested. It was found that 3 tubes had a lifetime of 398 hours, 5 of them had a lifetime of 410 hours and 2 had a lifetime of 400 ..