Discussion
What is the Y factor in a noise measurement?
Answer: D
Y is the measured ratio of receiver output power with a hot load and with a cold one, and from it the noise temperature of the receiver or of the antenna follows algebraically. A large Y factor means a quiet receiver and a well conditioned measurement. Gain over temperature is the station figure of merit, the split between antenna and receiver noise is what the measurement resolves, and bandwidth ratio is unrelated. One measured ratio and two known temperatures determine the unknown.
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