A-law algorithm - Revision history

en>Flyer22: Reverted 1 good faith edit by 181.158.97.205 using STiki

2014-12-06T04:59:31Z

Reverted 1 good faith edit by 181.158.97.205 using STiki

← Older revision		Revision as of 06:59, 6 December 2014
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	~~In [[telecommunication]], '''antenna noise temperature''' is the temperature~~ of a ~~hypothetical resistor at~~ the ~~input of an ideal [[signal noise\|noise]]-free receiver~~ that ~~would generate the same [[output]] [[noise power]] per unit [[Bandwidth (~~signal ~~processing)\|bandwidth]] as that at~~ the ~~[[antenna (radio)\|antenna]] output at a specified [[frequency]]~~.

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	*[[Galactic radiation]]
	*Earth heating
	*[[The sun]]
	*Electrical devices
	*The antenna itself

	~~Galactic noise is high below 1000 MHz~~. ~~At around 150 MHz, it is approximately 1000K~~. ~~At 2500 MHz, it has leveled off to around 10K~~.

	~~Earth~~ has ~~an accepted standard temperature~~ of ~~290K~~.

	The ~~level~~ of ~~the sun's contribution depends on the solar flux. It is given by~~

	~~:<math>T_A=3~~.~~468F{{\lambda}^2}10^{G/10}~~<~~/math~~>

	~~:where~~ <~~math~~>~~F</math> is~~ the ~~solar flux,~~

	:~~<math>\lambda<~~/~~math> is the wavelength,~~

	:~~and <math>G</math> is the gain~~ of the ~~antenna~~ in ~~decibels~~.

	~~The antenna [[noise temperature]] depends on antenna [[coupling (electronics)\|coupling]]~~ to ~~all noise sources in its environment as well as on noise generated within the antenna. That is, in a directional antenna, the portion of the noise source that the antenna~~'s ~~main and side lobes intersect contribute proportionally.~~

	~~For example,~~ a ~~satellite antenna may not receive noise contribution from the earth in its main lobe, but sidelobes will contribute a portion of the 290K earth noise to its overall noise temperature~~.

	~~==See also==~~
	*[~~[Noise Temperature]]~~
	*[[Federal Standard 1037C]]
	*[[MIL-STD-188]]

	~~==References==~~
	~~{{reflist}}~~
	~~{{cite book \| title = The Arrl Uhf~~/~~Microwave Experimenter's Manual \| publisher~~ = ~~American Radio Relay League \| location~~ = ~~Newington \| year~~ = ~~1990 \| isbn~~ = 0~~-87259-312-6 }}~~

	==~~External links==~~

	~~[[Category~~:~~Temperature~~]]
	[~~[Category~~:~~Noise]~~]

75.144.252.226: /* External links */

2013-08-14T20:48:41Z

External links

← Older revision		Revision as of 22:48, 14 August 2013
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			In [[telecommunication]], '''antenna noise temperature''' is the temperature of a hypothetical resistor at the input of an ideal [[signal noise\|noise]]-free receiver that would generate the same [[output]] [[noise power]] per unit [[Bandwidth (signal processing)\|bandwidth]] as that at the [[antenna (radio)\|antenna]] output at a specified [[frequency]].

			Antenna noise temperature has contributions from several sources:
			*[[Galactic radiation]]
			*Earth heating
			*[[The sun]]
			*Electrical devices
			*The antenna itself

			Galactic noise is high below 1000 MHz. At around 150 MHz, it is approximately 1000K. At 2500 MHz, it has leveled off to around 10K.

			Earth has an accepted standard temperature of 290K.

			The level of the sun's contribution depends on the solar flux. It is given by

			:<math>T_A=3.468F{{\lambda}^2}10^{G/10}</math>

			:where <math>F</math> is the solar flux,

			:<math>\lambda</math> is the wavelength,

			:and <math>G</math> is the gain of the antenna in decibels.

			The antenna [[noise temperature]] depends on antenna [[coupling (electronics)\|coupling]] to all noise sources in its environment as well as on noise generated within the antenna. That is, in a directional antenna, the portion of the noise source that the antenna's main and side lobes intersect contribute proportionally.

			For example, a satellite antenna may not receive noise contribution from the earth in its main lobe, but sidelobes will contribute a portion of the 290K earth noise to its overall noise temperature.

			==See also==
			*[[Noise Temperature]]
			*[[Federal Standard 1037C]]
			*[[MIL-STD-188]]

			==References==
			{{reflist}}
			{{cite book \| title = The Arrl Uhf/Microwave Experimenter's Manual \| publisher = American Radio Relay League \| location = Newington \| year = 1990 \| isbn = 0-87259-312-6 }}

			==External links==

			[[Category:Temperature]]
			[[Category:Noise]]

en>Abdul raja: fixed disamb link

2012-01-04T03:50:09Z

fixed disamb link

New page

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