Question

Why are very low noise figures relatively unimportant for a high frequency receiver?

a. High-frequency signals are inherently noisy
b. High-frequency signals are less susceptible to noise
c. Low noise figures improve selectivity
d. Low noise figures are always important

Answer 1

High-frequency FM radios are less impacted by noise because they only consider frequency variations for signal transmission, making very low noise figures less important.

Step-by-step explanation:

Very low noise figures are relatively unimportant for a high-frequency receiver because high-frequency signals, like those used in Frequency Modulation (FM) radio, are inherently less subject to noise from stray radio sources compared to Amplitude Modulation (AM) signals. This is due to the way FM signals encode information; FM receivers can reject noise that affects amplitude and can focus on variations in frequency, which is where the information is carried. Therefore, the noise figure, which quantifies how much noise a receiver adds to the signal, is less critical for high-frequency FM receivers since the system's design allows it to inherently deal with the noise effectively.