G / T
G / T , short for English gain-to-noise temperature , in English mostly as reception quality denotes the ratio is off gain G and noise temperature T a receiving device . The unit is 1 / K . If the ratio is given in decibels , it is called dB / K; this term is a closed expression, not a quotient of dB and K.
The reception quality summarizes the quality of the reception chain, including the reception antenna and intermediate amplifier .
G / T is proportional to the carrier-to-noise ratio C / N :
With
- Boltzmann's constant
- Bandwidth B
- Free space attenuation F
- Transmission power
- Antenna gain of the transmitter.
Example: A receiver has an antenna gain of and a noise temperature Then the ratio is
literature
- Jürgen Detlefsen, Uwe Siart: Basics of high frequency technology . 2nd, expanded edition. Oldenbourg, Munich et al. 2006, ISBN 3-486-57866-9 ( limited preview in the Google book search).