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guard band

noun, Radio.
an unassigned range of radio frequencies either just above or just below the band of frequencies required for the signal transmitted by a broadcasting station. It helps to prevent interference in receivers between signals from different stations.
Origin of guard band
1955-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for guard-band

guard band

a space left vacant between two radio frequency bands, or between two tracks on a magnetic tape recording, to avoid mutual interference
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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