Download PDF by Robert E. Collin: Antennas and Radiowave Propagation (Mcgraw Hill Series in

By Robert E. Collin

ISBN-10: 0070118086

ISBN-13: 9780070118089

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A high pressure is normally associated with warm weather, especially in summer. Under these conditions the hot air rises and cold air comes in to replace it. This accentuates the density gradient normally present and the change in refractive index occurring as a result of this can be very sharp. Other weather conditions can also bring about similar increases in the change of refractive index. Cold weather fronts can have the same effect. Here a mass of warm air and a mass of w ww. c o m Radio Waves and Propagation 29 cold air meet.

But to understand this deficiency, you must first understand the limitation of the AM design that uses a half-wave rectifier at the receiver. At transmission from the source, the AM signal modulation process generates two copies of the information (voice or music) plus the carrier. For example, consider an AM radio station that broadcasts at a carrier frequency of 900 kHz. The transmission might be modulated by a 1000-Hz (1-kHz) signal or tone. 5). The modulation frequencies are also known as the upper and lower sideband frequencies, respectively.

Those received signals are then filtered from all surrounding signals and noise and amplified prior to a process known as demodulation, which removes the desired information from the radio waves that carried it. These three steps—filtering, amplification and demodulation—detail the overall process. , designing the physical RF receiver printed-circuit board (PCB)) depends upon the type, complexity, and quantity of the data being transmitted. For example, designing an RF front end to handle a simple amplitude-modulated (AM) signal requires far less effort and hardware (and even software) than building an RF front end for the latest third-generation (3G) mobile telecommunications handset.

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Antennas and Radiowave Propagation (Mcgraw Hill Series in Electrical and Computer Engineering) by Robert E. Collin


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