Transmitters: Definition

The word “transmitter,” in the context of The Perham Collection, refers to a class of electronic devices that generate radio frequency (RF) energy containing useful information intended, for example, for radio or TV delivery to remote listeners or clients.

These devices are generally composed of electronic components like vacuum tubes, transistors, integrated circuits and other passive components that act in unison to produce RF energy from a direct current (DC) power supply. They can be thought of as “converters” of DC to RF energy. Power levels run from 0.1 watt (cordless phone) to 1,000,000 watts for the largest TV stations.

Typically, a low-level signal is produced by equipment in a studio environment. This signal is encoded (modulated) with the desired voice, music, data or video program material. It is then amplified to a high-level signal by the transmitter and applied to an antenna for broadcast through the atmosphere to various receivers operated by the listeners.

We all enjoy and take for granted the many types of transmitted information such as cell-phones, AM and FM radio, international internet (via satellite) and TV.