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By Martin Gandoff (Auth.)

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Mathematically,it is said to represent a sine wave. The horizontal axis represents time and the variation in time is shown by the height of the curve above or below the horizontal axis. This kind of trace or wave is often called an analogue signal. The maximum vertical level (A) is called the amplitude of the wave. With a waveform like this, the element that repeats is called a cycle and the frequency of the wave (or signal) is that specified by the number of cycles in one second. 4 A typical speech waveform .

Industry, are called 'smart' because they can do 'lots of clever things'. As part of their ability to The largest market at present seems to be in the autodial/autoanswer, they can respond to a series 9600-19,200 range. e. are starting to fall off because of the reduction in programmed. Unlike other types of modem, price of the high-speed ranges. There seem to be where options are selected with 'dip' switches, the about 250 companies offering modems in the UK, Hayes AT autodials commands set them by including IAL, Data Communications, Dynatech software.

In addition, as we have seen, to carry enormous numbers of channels, we need very wide For high-power work, the waveguide itself can frequency bands and even when dealing with the theoretically be extended to form the antenna on VHF (very high frequency) FM radio band the rooftop. It is drawn out to form a horn shape (80-110 MHz), there may not be sufficient which by its design concentrates the signal, capacity. thereby eliminating the need for a dish. ) There has been an increasing use made of microwave, which is a form of radio at a much Being of such a high frequency, line-of-sight higher frequency still (1000s of MHz).

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