There is a region between 1GHz and 10GHz where the temperature will be lowest. This region is called as microwave window or space window.

The figure of parameter G/T0 is called as receiver sensitivity.

A non regenerative repeaters can be used with many different modulation formats. It only amplifies and re transmits the message received.

Noise figure is a parameter that represents the noisiness of a two port network or device such as an amplifier, compared with a reference noise.

The principal advantage of regenerative repeaters over non regenerative repeaters is that the uplink is decoupled from the downlink so that the uplink noise is not transmitted on the downlink.

The region between 1GHz and 10GHz is called as space window or atmospheric window. Here the temperature will be the lowest. This region is used for satellite communication and deep-space communication.

Satellite repeaters re transmit the message received. It regenerates, demodulates and reconstitutes the digital information embedded in the received waveform.

Noise figure relates the SNR of the input to SNR of the output. It measures the SNR degradation caused by the network.

AM-to-AM conversion is a phenomenon common to non linear devices and it undergoes a non linear transformation and results in amplitude variation.

When two networks are connected in series, the composite noise figure can be written as F1+(F2-1)/G1.