- L band
NATO L band
IEEE L band
IEEEL band (20-cm radarlong-band) is a portion of the microwaveband of the electromagnetic spectrumranging roughly from 1 to 2 GHz. [cite web
url = http://emandpplabs.nscee.edu/cool/temporary/doors/electrospectrum/spectrum.htm
title = The Electromagnetic Spectrum and the Color Light Spectrum] [cite web
url = http://www.geocities.com/dtmcbride/tech/em-spectrum.html
title = Electromagnetic Frequency Spectrum
| first = Donald | last = McBride | date = 2006-03-01] It is used by some
communications satellites, and for some terrestrial Eureka 147 digital audio broadcasting(DAB). The amateur radioservice also has an allocation between 1240 and 1300 MHz. The L Band refers to the frequency range of 950 MHz to 1450 MHz. It is the result of the downconversion of the received downlink satellite signals (C or Ku) by the LNB (Low Noise Block converter).
United Statesand overseas territories, the L band is held by the military for telemetry, thereby forcing digital radioto in-band on-channel(IBOC) solutions. DAB is typically done in the 1452–1492-MHz range as in most of the world, but other countries also use VHF and UHF bands.
Global Positioning Systemcarriers are in the L band, centered at 1176.45 MHz (L5), 1227.60 MHz (L2), 1381.05 MHz (L3), and 1575.42 MHz (L1) frequencies.
Galileo Navigation Systemuses the L-band similarly to GPS.
GLONASSSystem uses the L-band similarly to GPS.
mobile phones operate at 800–900 and 1800–1900 MHz. Iridium (satellite)phones use frequencies between 1610 and 1625MHz to communicate with the satellites
Digital Audio Broadcasting (Earth Orbital)
WorldSpace satellite radiobroadcasts in the 1467–1492 MHz L sub-band.
DAB L band usage
The following blocks are used for T-DAB (terrestrial) broadcasts:
The following blocks are used for S-DAB (satellite) broadcasts:Note: Canada uses slightly different central frequencies for L-band DAB while in many European countries DAB is limited part of Band III due to television and mobile two way radio using the rest.
Physics issues relating to band use
The band also contains the hyperfine transition of neutral hydrogen (the
hydrogen line), which is of great astronomical interest as a means of imaging the normally invisible neutral atomic hydrogen in interstellar space. Consequently parts of the L-band are protected radio astronomyallocations world-wide.
Optical communications L band
"L band" is also used in
optical communicationsto refer to the wavelength range 1565 nm to 1625 nm.
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