Transmitters

Abstract

An electromagnetic signal picked up by an antenna is fed into a receiver. The ideal receiver rejects all unwanted noise including other signals. It does not add any noise or interference to the desired signal. The signal is converted, regardless of form or format, to fit the characteristics required by the detection scheme in the signal processor, which in turn feeds an intelligible user interface (Figure 12.1). The unit must require no new processes, materials, or devices not readily available. This ideal receiver adds no weight, size, or cost to the overall system. In addition, it requires no power source and generates no heat. It has an infinite operating lifetime in any environment, and will never be obsolete. It will be flexible, fitting all past, present, and future requirements. It will not require any maintenance, and will be transparent to the user, who will not need to know anything about it in order to use it. It will be fabricated in an “environmentally friendly” manner, visually pleasing to all who see it, and when the user is finally finished with this ideal receiver, he will be able to recycle it in such a way that the environment is improved rather than harmed. Above all else, this ideal receiver must be wanted by consumers in very large quantities, and it must be extremely profitable to produce. Fortunately, nobody really expects to achieve all of these “ideal” characteristics, at least not yet! However, each of these characteristics must be addressed by the engineering design team in order to produce the best product for the application at hand.