Table of Contents
What do you mean by noise temperature?
The noise temperature is the temperature of a resistor that has noise power equal to that of the device or circuit. Specifically, the noise temperature is defined by T = N/kB, where N is the noise power within bandwidth B, and k = 1.38 × 10-23J K-1 is Boltzmann’s constant.
Why is g/t important?
The antenna gain to noise temperature ratio is a figure of merit to indicate the performance of the earth station antenna and the low noise amplifier in relation to sensitivity in receiving downlink carrier from the satellite.
What is G T value?
Antenna gain-to-noise-temperature (G/T) is a figure of merit in the characterization of antenna performance, where G is the antenna gain in decibels at the receive frequency, and T is the equivalent noise temperature of the receiving system in kelvins.
What is the difference between noise figure and noise temperature?
The noise figure number, displayed in decibels (dB), represents the performance by which an amplifier or RF receiver can be measured. Noise temperature is a representation of noise in terms of the temperature required to produce an equivalent amount of Johnson-Nyquist Noise.
What is the noise temperature of the LNA?
For example, LNAs with a noise figure range of 1.010 to 1.014 (ratio) are more conveniently characterized with a noise temperature range of 3 to 4 kelvins.
What is the meaning of VSAT?
very small aperture terminal
A very small aperture terminal (VSAT) is a small-sized earth station used in the transmit/receive of data, voice and video signals over a satellite communication network, excluding broadcast television.
What is RF noise?
Noise in RF systems can generally be regarded as any RF energy that is not the desired signal. Two terms commonly used to describe RF noise are Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). EMI is random, broadband noise whereas RFI is narrowband noise broadcast at specific frequencies.