Archive for September, 2009

Technical Topics for Wireless Mics

Friday, September 18th, 2009

This section goes into detail on some of the more technical topics relating to wireless microphones.
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Frequency Selection for Wireless Microphones

Friday, September 18th, 2009

Frequency coordination is essential to the proper function of wireless systems. Not only must channels be sufficiently spaced apart, but they must also be checked to ensure that they will not interfere with each other if the RF signals become distorted. This phenomenon, commonly referred to as \emph{Intermodulation distortion}, occurs when signals pass through nonlinear devices such as amplifiers and receiver circuits. Finally, channels must be selected to avoid television stations (both analog and digital), and also two-way radio systems operating in certain cities.
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The Big Picture – What’s in a Wireless System?

Friday, September 18th, 2009

Wireless systems consist of a number of components. Transmitters and receivers are the most obvious of these componenets, but coaxial cable (sometimes referred to as transmission line), antenna splitters, amplifiers, and antennas also contribute to wireless systems. In this section, we will discuss these components in depth.
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Introduction to Wireless Microphone Systems

Friday, September 18th, 2009

Wireless equipment is perhaps one of the most poorly understood technologies used in the theatre and broadcasting world today.  Despite their complexity, it is possible to develop an intuitive understanding of how these devices work.  The purpose of this document is to explain the fundamental behavior of wireless systems, and to apply this knowledge to the functionality of wireless microphones, wireless in-ear monitors, and similar systems commonly found in the theatre and broadcast industries.  This guide assumes that the reader is familiar with basic electrical concepts such as impedance and electrical waves.

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Antennas

Friday, September 18th, 2009

Antennas are passive electrical devices that convert electromagnetic radiation into electrical signals, and vice versa. Both transmitters and receivers require antennas to operate. Transmitters typically have small “whip” antennas mounted on them, and receivers usually have a connector on the rear to attach an external antenna. There are a number of types of antennas commonly used for wireless microphone receivers.

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