The AGC function of an MF/HF receiver is...

Question 1 / 270705mRslYxBNNY6Fn6w9xnb

Question 1 of 270705mRslYxBNNY6Fn6w9xnb

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

Question 1 of 27070

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

🔍 Key Concepts

• AGC (Automatic Gain Control) purpose in a receiver and which stage it acts on • Signal path in a superheterodyne MF/HF receiver: RF → mixer/local oscillator → IF → detector → audio • What each component does: BFO, VCO, audio amplifier, and variable RF/IF gain stages

💭 Think About

• Ask yourself: At what point in the receiver chain does AGC typically sense signal strength and control gain? RF/IF stages, detector, or audio? • Which of the listed circuits would, if it failed, MOST directly prevent the receiver from automatically adjusting gain as signal strength changes? • Consider what symptoms you’d see if only the audio amplifier failed versus if the AGC control element in an RF/IF gain stage failed.

✅ Before You Answer

• Be clear on the definition and function of AGC: it automatically adjusts receiver gain to maintain relatively constant output despite varying input signal levels. • Match each answer choice with the stage of the receiver it belongs to (RF/IF, oscillator/mixer, audio) and ask: which one is normally tied into the AGC control line? • Verify which component’s failure would specifically stop automatic gain control, but might still allow manual gain/volume control to work.

Question 1 of 27070

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

The B.F.O. circuit has failed.

The Voltage controlled Oscillator is inoperative.

The audio amplifier is defective.

Failure of a variable gain amplifier in the RF stage .

Question 1 / 270705mRslYxBNNY6Fn6w9xnb

Question 1 of 270705mRslYxBNNY6Fn6w9xnb

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?

Back

Question 1 of 27070

The AGC function of an MF/HF receiver is inoperative. What is the most likely cause?