secondary frequency

См. также в других словарях:

• Secondary frequency standard — In telecommunications, a secondary frequency standard is a frequency standard that does not have inherent accuracy, and therefore must be calibrated against a primary frequency standard. Secondary standards include crystal oscillators and… …   Wikipedia

• secondary frequency standard — antrinis dažnio standartas statusas T sritis automatika atitikmenys: angl. secondary frequency standard vok. Sekundärfrequenzstandard, m rus. вторичный стандарт частоты, m pranc. étalon secondaire de fréquence, m …   Automatikos terminų žodynas

• secondary frequency standard — antrinis dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. secondary frequency standard vok. Sekundärfrequenznormal, n rus. вторичный эталон частоты, m pranc. étalon secondaire de fréquence, m …   Radioelektronikos terminų žodynas

• Secondary surveillance radar — SSR antenna of Deutsche Flugsicherung at Neubrandenburg, in Mecklenburg/Western Pomerania Secondary surveillance radar (SSR)[1] is a radar system used in air traffic control (ATC), that not only detects an …   Wikipedia

• Frequency standard — A frequency standard is a stable oscillator used for frequency calibration or reference. A frequency standard generates a fundamental frequency with a high degree of accuracy and precision. Harmonics of this fundamental frequency are used to… …   Wikipedia

• Secondary source — In library and information science, historiography and other areas of scholarship, a secondary source [ [http://www.lib.umd.edu/guides/primary sources.html Primary, Secondary and Tertiary Sources, UM Libraries] ] [… …   Wikipedia

• Secondary characters in Calvin and Hobbes — Bill Watterson s comic strip Calvin and Hobbes features a wide range of secondary characters. These range from his fellow students at school to monsters and aliens from Calvin s vivid imagination. Contents 1 Calvin s family 1.1 Calvin s father… …   Wikipedia

• Secondary neoplasm — A secondary neoplasm refers to any of a class of cancerous tumors that are either metastatic offshoots of a primary tumor, or apparently unrelated tumors that increase in frequency following certain cancer treatments, including chemotherapy or… …   Wikipedia

• guard frequency — An emergency VHF/UHF (very high frequency/ultrahigh frequency) channel monitored as a secondary frequency by all air and ground stations in a geographical area. The guard frequencies 121.5, 243 and 406 MHz are reserved around the world and are… …   Aviation dictionary

• Low-frequency oscillation — The term low frequency oscillation (LFO) is an audio signal usually below 20 Hz which creates a pulsating rhythm rather than an audible tone. LFO predominantly refers to an audio technique specifically used in the production of electronic music.… …   Wikipedia

• Aircraft emergency frequency — The aircraft emergency frequency (also known as guard) is a frequency used on the aircraft radio band reserved for emergency communications for aircraft in distress. The frequencies are 121.5 MHz for civilian, also known as International Air… …   Wikipedia