20-meter band - definizione. Che cos'è 20-meter band
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Cosa (chi) è 20-meter band - definizione


20-meter band         
AMATEUR RADIO FREQUENCY BAND
20 meters; 20 meter band; 20m; 20m band; 20 meter
The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14.000 MHz to 14.
630-meter band         
  • Regions with an amateur radio allocation near 500 kHz in early 2011. Dark blue indicates official allocations based on WRC-12. Light blue indicates official allocations that are outside the WRC-12 frequencies (e.g. Norway). Green indicates experimental allocations. Operation is prohibited in red regions.
AMATEUR RADIO FREQUENCY BAND
600-meter band; 630-meter amateur radio band; 600-meter amateur band; 600-meter band (amateur radio); 630m band; 600-meter amateur radio band
The 630-meter (or 600-meter) amateur radio band is a frequency band allocated by the International Telecommunication Union (ITU) to amateur radio operators, and it ranges from 472–479 kHz, or equivalently 625.9–635.
exposure meter         
  • CdS]] [[photoresistor]], in opening at left.
  • Analog handheld light meter - Gossen Lunasix 3 (in US: Luna Pro S); available from 1961 to 1977
  • HortiPower spectrum meter to measure Photon Flux Density (light for plants)
  • Kodalux
  • Leica IIIC with Voigtlander VC Meter II
  • Leudi extinction meter
  • Metrophot
  • Sekonic Twinmate L208
  • Sekonic<br />L-358 Flash Master<br />A handheld digital light meter showing an exposure of 1/200th at an aperture of f/11, at ISO 100. The light sensor is on top, under the white diffusing hemisphere.
  • Tessina Meter
  • Voigtlander VC Meter
DEVICE FOR MEASURING LUMINOSITY
Exposure Meter; Posemeter; Light Meter; Luxmeter; Exposure meter; Lightmeter; Lux meter; CdS meter; Light metering; Light-metering
¦ noun Photography a light meter.