In Practice

摘要

There are several different ways to measure receiver sensitivity, but you can quite easily convert between them using a calculator. Receiver manufacturers, Peter Hart, G3SJX, and ARRL's QST magazine all use a system based on injecting a weak carrier signal into the receiver input, and measuring the signaloise ratio at the audio output. What comes out at audio is a combination of: 1. the single sine-wave that you get by tuning-in a carrier on an SSB receiver 2. receiver noise 3. distortion - mainly harmonics of the sine-wave.