Other Definitions
dropout (dict)
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Dropout The term "dropout" means a child who quits school before graduation. Compare pushout, a child counseled or forced out of school before graduation. The term dropout has the following meanings: 1. In a communications system, a momentary loss of signal. Note: Dropouts are usually caused by noise, propagation anomalies, or system malfunctions. 2. A failure to read properly a binary character from data storage. Note: A dropout is usually caused by a defect in the storage medium or by a malfunction of the read mechanism. 3. In magnetic tape, disk, card, or drum systems, a recorded signal with an amplitude less than a predetermined percentage of a reference signal. Source: from Federal Standard 1037C and from MIL-STD-188 Slots in a bicycle frame where the axle(wheel) is attached.
Horizontal dropouts allow adjustment of chain tension, and can accommodate a range of chain lengths or cog sizes. They are typically used by single-speeds.
Vertical dropouts necessitate another means of chain-tensioning, by a derailleur or chain tensioner A dropout is a source whose radiation disappears shortward of a given filter. Looking for dropouts is an usual method to look for high redshift galaxies.
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