cone of silence
Also found in: Dictionary, Acronyms, Wikipedia.
cone of silence
[′kōn əv ′sī·ləns] (navigation)
A cone-shaped region, directly over the antenna of a radio-beacon transmitter, in which no signal is detected.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
cone of silence
i. An inverted cone-shaped space directly over the aerial towers of some forms of radio beacons, in which signals are unheard or greatly reduced in volume.
ii. In some repeater installations using high-gain antennae, located above the level of average terrain, a cone of silence exists under the antennae. This zone may extend outward for several miles in all directions at ground level. This makes a nearby repeater useless.
iii. An approximately coned-shaped extent of space extending from a radar transmitting set and through which pulses are not sent because of inadequate antenna coverage.
ii. In some repeater installations using high-gain antennae, located above the level of average terrain, a cone of silence exists under the antennae. This zone may extend outward for several miles in all directions at ground level. This makes a nearby repeater useless.
iii. An approximately coned-shaped extent of space extending from a radar transmitting set and through which pulses are not sent because of inadequate antenna coverage.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved