J band
Frequency range
|
10 - 20 GHz |
---|---|
Wavelength range
|
3 – 1.5 cm |
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) | |
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
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 R Doradus (-2.6), Arcturus (-2.2), and Aldebaran (-2.1).[4] In the J band Sirius is the 9th brightest star.
References
- ↑ NATO Joint Civil/Military Frequency Agreement (NJFA)
- ↑ Joint Radio Company
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