"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
OMNIDIRECTIONAL ANTENNA: An antenna that radiates equally in all directions (nondirectional). An antenna whose radiation pattern shows equal radiation in all horizontal directions. See also the Antenna Manufacturers page, or the Antenna Dictionary page.
OPERATIONAL CONSTRAINTS: Limitations on operating procedures in order to prevent interference between missile systems on a ship or between missile systems in a formation of ships under operational conditions. These limitations
consist of such things as limited frequency bands or channels in which the radars may be tuned, limited sectors of space into
which radar beams may be pointed, limits on minimum spacing between ships, limits on what codes may be used by radars and missiles on each ship, and limits on minimum interval between firing of certain missiles.
ORANGE-PEEL PARABOLOID: A section of a complete circular paraboloid that is narrow in the
horizontal plane and wide in the vertical plane.
Oscillation: A periodic, repetitive motion or set of values (voltage, current, velocity). [Oscillator Manufacturers]
OSCILLATORS: Devices which generate a frequency. See also Backward Wave, Dielectrically Stabilized Oscillator, Hyperabrupt Varactor Oscillator, Magnetron Oscillator, Varactor Tuned Oscillator, and YIG tuned oscillator. [Oscillator Comparison Table]
OSCILLATOR, LOCAL: See Local Oscillator Frequency.
