The MF/HF receiver fails to produce any AF...

Question 1 / 27070QtAET4jPxFxA3dl6o4hK

Question 1 of 27070QtAET4jPxFxA3dl6o4hK

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?

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Question 1 of 27070

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?

🔍 Key Concepts

• Relationship between ohmmeter readings and speaker coil condition • Difference between faults in RF/IF stages and audio (AF) output components • How a shorted load vs open or low-gain amplifier would appear in resistance measurements

💭 Think About

• What does a near zero ohms reading across speaker leads tell you about the physical condition of the speaker coil? • If the RF or AF amplifier stages failed but the speaker itself were healthy, what resistance would you expect to see across the speaker leads? • Which option specifically describes a component whose DC resistance you can directly measure across the speaker leads with an ohmmeter?

✅ Before You Answer

• Confirm what a normal speaker voice coil resistance typically measures (a few ohms, not open and not exactly zero). • Check which answer choices refer to something that would be seen directly at the speaker terminals with an ohmmeter. • Eliminate choices that refer to signal amplification issues rather than a physical short visible as near-zero resistance.

Question 1 of 27070

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?

The 3 - 30 MHz amplifier stage has failed.

The speaker is shorted out.

Excess negative feedback is reducing AF gain.

The audio amplifier stage has failed.

Question 1 / 27070QtAET4jPxFxA3dl6o4hK

Question 1 of 27070QtAET4jPxFxA3dl6o4hK

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?

Back

Question 1 of 27070

The MF/HF receiver fails to produce any AF output. An ohmmeter reading is near zero between speaker leads. What is the most likely cause?