Frequency Band

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Frequency Band [[/a>|/a> ]]</dt>
A continuous range of frequencies extending between two limiting frequencies. </dd>
''Specific frequency bands used in radio and radar are often designated by names, numbers, or letters. The band designations as decided upon by the Atlantic City Radio Convention of 1947 and later modified by Comite Consultatif International Radio (CCIR) Recommendation No. 142 in 1953 were:

' <tbody> </tbody>

Band number	Frequency range		Metric subdivision waves	Atlanctic City frequency subdivision
	kc
4	3-	30	Myriametric	Very-low	VLF
5	30-	300	Kilometric	Low	LF
6	300-	3,000	Hectometric	Medium	MF
7	3,000-	30,000	Decametric	High	HF
	mc
8	30-	300	Metric	Very-high	VHF
9	300-	3,000	Decimetric	Ultra-high	UHF
10	3,000-	30,000	Centimetric	Super-high	SHF
11	30,000-	300,000	Millimetric	Extremely high	EHF
12	300,000-	3,000,000	Decimillimetric	--	--

'Note that band N extends from

0.3*10<math>^N</math> to 3*10<math>^N</math> cycles; thus band 4 designates the frequency range 0.3*10⁴ to 3*10⁴ cycles. The upper limit is included in each band; the lower limit is excluded. '</dd>
'Description of bands by means of adjectives is arbitrary and the CCIR recommend that it be discontinued. '</dd>
'The designation ELF, extremely low frequency, has recently been proposed for the band extending from 3 kilocycles down to 1 cycle per second. These frequencies have been used for years in the study of lightning and associated phenomena and may be useful in communicating with spacecraft. '</dd>
'The frequency bands used by radar (radar frequency bands) were first designated by letters for military secrecy. Those designations were:

' <tbody> </tbody>

Frequency band	Approximate frequency range, gigacycles	Approximate wavelength range, centimeters
P-band	0.225 to 0.39	140 to 76.9
L-band	0.39 to 1.55	76.9 to 19.3
S-band	1.55 to 5.20	19.3 to 5.77
X-band	5.20 to 10.90	5.77 to 2.75
K-band	10.90 to 36.00	2.75 to 0.834
Q-band	36.00 to 46.00	0.834 to 0.652
V-band	46.00 to 56.00	0.652 to 0.536

'The C-band, 3.9 to 6.2 gigacycles,

overlaps the S- and X-bands. These letter designations have no official sanction. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use