in [K] of the source (e.g. antenna) at the input of the receiver
: = equivalent noise temperature in [K] of the receiver referred to the input of the receiver
: = bandwidth [Hz]
: = Required SNR at output [-]

The same formula can also be expressed in terms of noise factor of the receiver as

where
: = noise factor
: = input noise power
: = required SNR at output.

Because receiver sensitivity indicates how faint an input signal can be to be

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