The MF/HF transceiver produces strong AF...

Question 1 / 20QQKlDnMRVPfYR0nvLc1I

Question 1 of 20QQKlDnMRVPfYR0nvLc1I

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

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Question 1 of 20

QQKlDnMRVPfYR0nvLc1I

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

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🔍 Key Concepts

• MF/HF radiotelephone receiver signal path: RF/IF stages, detector, then AF (audio frequency) amplifier • Difference between no RF received vs. no audio out conditions • Effect of squelch and antenna/feeder line faults on what you hear in the speaker

💭 Think About

• If you have strong AF output in the speaker, what does that tell you about the condition of the AF amplifier stages? • What kind of fault would cause there to be no received signals on any frequency, but still allow you to hear loud audio noise from the speaker? • In which part of the receiver would a failure prevent RF from ever reaching the detector, even though the audio stages are fine?

✅ Before You Answer

• Confirm what "strong AF output" implies about where the fault is not located • Consider whether a completely open transmission line to the antenna would still allow you to hear any internal noise in the receiver • Distinguish carefully between failures in audio (AF) stages and failures in earlier RF/IF or power amplifier stages of the receiver

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Question 1 of 20

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

The squelch sensitivity control is set too high.

There is an open circuit in the transmission line to the antenna .

The final stage of the AF amplifier circuit has failed.

The power amplifier stage in the receiver has failed.

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Question 1 / 20QQKlDnMRVPfYR0nvLc1I

Question 1 of 20QQKlDnMRVPfYR0nvLc1I

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

Back

Question 1 of 20

QQKlDnMRVPfYR0nvLc1I

The MF/HF transceiver produces strong AF output but no signals are heard on any frequency. What is the most likely cause?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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— No credit card needed