noise temperature การใช้

• One relates to noise factor while the other relates to noise temperature.
• Thus the noise temperature is proportional to the power spectral density of the noise, P / B.
• This particular design had very low sidelobes, and thus made very low receiving system noise temperatures possible.
• Plot used in the Y-factor method for determining the gain and noise temperature of an amplifier.
• Typical receiver noise temperatures at 115.3 GHz are 65-70 K single sideband ( SSB ).
• The antenna noise temperature T _ { ant } gives the noise power seen at the output of the antenna.
• The low-noise quality of an LNB is expressed as the noise figure ( or sometimes noise temperature ).
• Thus it doesn't make sense to talk about the noise temperature of a capacitor or of a voltage source.
• The noise temperature of the receiver circuitry T _ { sys } represents noise generated by noisy components inside the receiver.
• The whole system noise temperature looking at cold sky ( 2.7 kelvins in the microwave band ) was 17 kelvins.
• The antenna noise temperature depends on antenna coupling to all noise sources in its environment as well as on noise generated within the antenna.
• The stock LNBs fitted to typical BUDs will usually need to be replaced with one of a lower noise temperature to receive digital broadcasts.
• Note that one can only speak of the noise temperature of a component or source whose impedance has a substantial ( and measurable ) resistive component.
• However in many cases the input source's noise temperature is much higher, such as an antenna at lower frequencies where atmospheric noise dominates.
• The x-intercept of the line is equal to the negative of the amplifier noise temperature-" T amp " in kelvin.
• The amplifier noise temperature can also be determined from the y-intercept, which is equal to " T amp " multiplied by the gain.
• 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.
• 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.
• 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.
• 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.