What is the purpose of a notch filter in an HF receiver?
AnswerTo reduce interference from carriers in the receiver passband.
A notch filter removes a narrow slice of audio or IF spectrum, making a steady interfering carrier much less objectionable.
RF PREP // FCC AMATEUR RADIO
G4 · Amateur Radio Practices
General · correct answers only, in question-pool order.
How does a noise blanker reduce impulse noise?
AnswerBy reducing receiver gain during a noise pulse.
A noise blanker detects short high-amplitude impulses and suppresses the receiver briefly during those events.