Receiving system figure of merit GT

The receiving system figure of merit (G/T) describes the capability of a satellite or earth station to receive a signal. This is defined as follows:

Where

G/T is the figure of Merit measured in dB per degree Kelvin (dB/K) G is the net antenna gain up to the reference plane, which is normally the input to LNA, in dB

T is the effective noise temperature of the receiving system in degrees Kelvin. Net antenna gain

The net antenna gain is the gross gain of the antenna less the losses of all of the components making up the downlink receive chain, namely the radome loss, feed loss, directional coupler loss, wave guide loss, the band pass filter loss and transition losses. These components are illustrated in Figure 3.25.

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