Define the following as applied to radio receivers. Noise figure Adjacent channel ratio Band with

Noise figure:
The noise figure of a receiver is a measure of its sensitivity and is expressed in decibels (dB). It is defined as the ratio of the signal-to-noise ratio (SNR) at the input of the receiver to the SNR at the output. The lower the noise figure, the more sensitive the receiver.

Adjacent channel ratio:
The adjacent channel ratio of a receiver is a measure of its ability to reject unwanted signals from adjacent channels. It is expressed in dB and is defined as the ratio of the desired signal level to the level of the unwanted signal in the adjacent channel. The higher the adjacent channel ratio, the better the receiver's ability to reject unwanted signals.

Band width:
The bandwidth of a receiver is the range of frequencies that it can receive. It is expressed in hertz (Hz) and is defined as the difference between the upper and lower cutoff frequencies of the receiver. The wider the bandwidth, the more channels the receiver can receive.