J band
NATO J bandFrequency range |
10 - 20 GHz |
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Wavelength range |
3 – 1.5 cm |
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Related bands |
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J band can refer to three different regions of the electromagnetic spectrum, in the radio and near-infrared.
NATO J band
The NATO J band is the obsolete designation given to the radio frequencies from 10 to 20 GHz (equivalent to wavelengths between 3 and 1.5 cm) during the cold war period. Since 1992 frequency allocations, allotment and assignments are in line to NATO Joint Civil/Military Frequency Agreement (NJFA).[1]
However, in order to identify military radio spectrum requirements, e.g. for crises management planning, training, Electronic warfare activities, or in military operations, this system is still in use.
NATO Radio spectrum designation |
LATEST SYSTEM | | ALTERNATIVE SYSTEM |
BAND | FREQUENCY (MHz) | | BAND | FREQUENCY (MHz) |
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A | 0 – 250 | | I | 100 – 150 |
B | 250 – 500 | | G | 150 – 225 |
C | 500 – 1 000 | | P | 225 – 390 |
D | 1 000 – 2 000 | | L | 390 – 1 550 |
E | 2 000 – 3 000 | | S | 1 550 – 3 900 |
F | 3 000 – 4 000 | | C | 3 900 – 6 200 |
G | 4 000 – 6 000 | | X | 6 200 – 10 900 |
H | 6 000 – 8 000 | | K | 10 900 – 36 000 |
I | 8 000 – 10 000 | | Ku | 10 900 – 20 000 |
J | 10 000 – 20 000 | | Ka | 20 000 – 36 000 |
K | 20 000 – 40 000 | | Q | 36 000 – 46 000 |
L | 40 000 – 60 000 | | V | 46 000 – 56 000 |
M | 60 000 – 100 000 | | W | 56 000 – 100 000 |
JRC
In the United Kingdom, the term "J Band" is also used by the Joint Radio Company to refer to their VHF communications band at 139.5-140.5 and 148-149 MHz used by fuel and power industries.[2]
Infrared astronomy
Atmospheric windows in the infrared. The J band is the transmission window centred on 1.25 micrometres
In infrared astronomy, the J band refers to an atmospheric transmission window centred on 1.25 micrometres (in the near-infrared). Betelgeuse is the brightest near-IR source in the sky with a J band magnitude of -2.99.[3] The next brightest stars in the J band are Antares (-2.7), R Doradus (-2.6), Arcturus (-2.2), and Aldebaran (-2.1).[4] In the J band Sirius is the 9th brightest star.
References
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ELF 3 Hz/100 Mm 30 Hz/10 Mm
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SLF 30 Hz/10 Mm 300 Hz/1 Mm
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ULF 300 Hz/1 Mm 3 kHz/100 km
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VLF 3 kHz/100 km 30 kHz/10 km
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LF 30 kHz/10 km 300 kHz/1 km
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MF 300 kHz/1 km 3 MHz/100 m
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HF 3 MHz/100 m 30 MHz/10 m
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VHF 30 MHz/10 m 300 MHz/1 m
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UHF 300 MHz/1 m 3 GHz/100 mm
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SHF 3 GHz/100 mm 30 GHz/10 mm
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EHF 30 GHz/10 mm 300 GHz/1 mm
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THF 300 GHz/1 mm 3 THz/0.1 mm
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