The antenna noise temperature depends on antenna coupling to all noise sources in its environment as well as on noise generated within the antenna.
12.
The stock LNBs fitted to typical BUDs will usually need to be replaced with one of a lower noise temperature to receive digital broadcasts.
13.
Note that one can only speak of the noise temperature of a component or source whose impedance has a substantial ( and measurable ) resistive component.
14.
However in many cases the input source's noise temperature is much higher, such as an antenna at lower frequencies where atmospheric noise dominates.
15.
The x-intercept of the line is equal to the negative of the amplifier noise temperature-" T amp " in kelvin.
16.
The amplifier noise temperature can also be determined from the y-intercept, which is equal to " T amp " multiplied by the gain.
17.
Noise temperature is generally a function of frequency, unlike that of an ideal resistor which is simply equal to the actual temperature of the resistor at all frequencies.
18.
Any gain-degrading factors which raise side lobes have a two-fold effect, in that they contribute to system noise temperature in addition to reducing gain.
19.
Speaking of noise temperature therefore offers a fair comparison between components having different impedances rather than specifying the noise voltage and qualifying that number by mentioning the component's resistance.
20.
He developed the niobium bar gravitational wave detector NIOBE, which achieved the lowest observed noise temperature participated in worldwide collaboration that set the best limit on the burst events in 2001.
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