Q2Principle of Electronic Communication
Question
2 marks
Q.2. Define 'Gain' and 'Attenuation' in the context of a communication system. [2]
Answer
Gain is the ratio of output signal power (or voltage) to input signal power (or voltage) for an active device such as an amplifier, expressed in dB as 10*log10(Pout/Pin), representing signal strengthening. Attenuation is the reduction in signal power as it passes through a passive medium (cable, connector, free space), expressed as a positive dB loss value, representing signal weakening.