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Friis formula or Friis's formula (sometimes Friis' formula), named after Danish-American electrical engineer Harald T. Friis, is either of two formulas used in telecommunications engineering to calculate the signal-to-noise ratio of a multistage amplifier. One relates to noise factor while the other relates to noise temperature.
The Friis transmission formula is used in telecommunications engineering, equating the power at the terminals of a receive antenna as the product of power density of the incident wave and the effective aperture of the receiving antenna under idealized conditions given another antenna some distance away transmitting a known amount of power. [1]
Download QR code; Print/export Download as PDF; Printable version; In other projects ... Friis formulas for noise; Friis transmission equation
The noise power from a simple load is equal to kTB, where k is the Boltzmann constant, T is the absolute temperature of the load (for example a resistor), and B is the measurement bandwidth. This makes the noise figure a useful figure of merit for terrestrial systems, where the antenna effective temperature is usually near the standard 290 K ...
The noise factor (a linear term) is more often expressed as the noise figure (in decibels) using the conversion: = The noise figure can also be seen as the decrease in signal-to-noise ratio (SNR) caused by passing a signal through a system if the original signal had a noise temperature of 290 K. This is a common way of expressing the noise ...
Harald Trap Friis (22 February 1893 – 15 June 1976), who published as H. T. Friis, was a Danish-American radio engineer whose work at Bell Laboratories included pioneering contributions to radio propagation, radio astronomy, and radar. [1]
Printable sheet music primarily for singers and voice teachers—most downloadable. Emphasis on standard classical and traditional repertoire. IPA transcriptions available for every German, French, Italian and Latin song in the index. Supplementary information on more than 250 songs. ART SONG CENTRAL: The Ashford Sheet Music Collection
Yes, that is exactly right. Bingo! They absolutely cannot specify a Friis noise-figure. They can, however, specify its effective input noise temperature--which is the only information the IEEE's "noise-figure" carries. So, on the one hand, they CANNOT specify a Friis noise-figure, but on the other hand, they CAN specify an IEEE noise-figure. Hmmm.
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