Advanced Qualification · A-006 Receivers · A-006-003-001
What is meant by the noise floor of a receiver?
- A The amount of noise generated by the RF receiver local oscillator
- B The weakest signal that can be detected above the receiver internal noise
- C The weakest signal that can be detected under noisy atmospheric conditions
- D The minimum level of noise that will overload the receiver RF amplifier stage
Correct answer: B — The weakest signal that can be detected above the receiver internal noise. From the official ISED question bank, verified word for word.
Why
The noise floor is the baseline level of static created inside the receiver itself, so the weakest signal you can hear must be stronger than this internal hum to be understood. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.