wavelength meter

См. также в других словарях:

• Optical power meter — in use An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. Other general purpose light power measuring devices are usually… …   Wikipedia

• 1.25-meter band — The 1.25 meter band is a portion of the VHF radio spectrum allocated for amateur radio use in ITU Region 2, comprising frequencies from 222 MHz to 225 MHz in the United States (with the addition of 219–220 MHz on a limited, secondary basis) and… …   Wikipedia

• 160-meter band — Just above the mediumwave broadcast band, 160 meters is the lowest radio frequency band allocation available to amateur radio operators in most countries. Seasoned operators often refer to 160 meters as Top Band, it is also sometimes referred to… …   Wikipedia

• Thirty Meter Telescope — The Thirty Meter Telescope (TMT) will be a ground based astronomical observatory with a 30 metre (98 foot) diameter segmented mirror capable of observations from the near ultraviolet to the mid infrared (0.31 to 28 micrometres). An adaptive… …   Wikipedia

• 80-meter band — The 80 meter or 3.5 MHz band is a core amateur radio frequency band, allocated frequencies from 3.5 to 4.0 MHz in IARU Region 2, and generally 3.5 to 3.8 or 3.9 MHz in Regions 1 and 3 respectively. The portion of the band used for voice… …   Wikipedia

• 15-meter band — In telecommunications, 15 meters is a shortwave radio band used by amateur radio operators. The band is located at 21 MHz, and almost all countries permit amateur radio activity on the entire band. The 15 meter band was opened to amateurs in the… …   Wikipedia

• International Prototype Meter — right|thumb|220px|Historical International Prototype Meter bar, made of an alloy of platinum and iridium, that was the standard from 1889 to 1960.The meter was originally defined as one ten millionth of the distance between the North Pole and the …   Wikipedia

• John L. Hall — Infobox Scientist name = John Lewis Hall birth date = birth date and age|1934|8|21 birth place = Denver, Colorado, U.S. nationality = United States field = Physics work institution = University of Colorado, JILA, NIST alma mater = Carnegie… …   Wikipedia

• Antenna (radio) — Whip antenna on car …   Wikipedia

• Metre — This article is about the unit of length. For other uses of metre or meter , see meter (disambiguation). 1 metre = SI units 100 cm 1000 mm US customary / Imperial units 3.2808 ft 39.370 in The metre (or meter), symbol m, is… …   Wikipedia

• B-Band — Ein Frequenzband bezeichnet Frequenzbereiche, also Teilbereiche des elektromagnetischen Spektrums der zur technischen Kommunikation verwendeten elektromagnetischen Wellen. Aufteilungen nach Frequenz, Wellenlänge oder Nutzung sind üblich.… …   Deutsch Wikipedia