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Definition of "Keyer" |
A device that changes dc pulses to mark and space modulation for teletypewriter transmissions. A synchronizer. This term is obsolete. / A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboard in the sense that there is no board the keys are arranged in a cluster. A keyer may take the form of a single telegraph key for keying Morse code. In this use, the term to key means to turn on and off a carrier wave, typically. / Infrared radiation refers to electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers to 1 mm. This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz.Most of the thermal radiation emitted by objects near room temperature is infrared. |
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