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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9

1/4 Wave
Refers to wavelengths of audio or electromagnetic radiation (i.e. radio waves). One quarter of a wave denotes some dimension having a relationship with a signal such that it is 25% (or 1/4) as large as the space required for the entire wave of the signal. For example, in an RF (Radio Frequency) or wireless system 1/4 wave antennas are common. A 1/4 wave (typically pronounced "Quarter Wave") antenna's length is 1/4 as long as the wavelength of the carrier frequency used by the system. There are also 1/2 wave antennas, and so on. Similar relationships exist in the field of acoustics (see WFTD Quarter Space), though they aren't usually this specific (audio systems generally have to respond to a wide range of frequencies) and it's not as common to hear things referred to in this manner.

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70-Volt System802.119-pin
     
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