The MF/HF transceiver fails to produce AF...

Question 1 / 20Lxv7wrWShB1dOvmnhRS3

Question 1 of 20Lxv7wrWShB1dOvmnhRS3

The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. What is the most likely cause?

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Question 1 of 20

Lxv7wrWShB1dOvmnhRS3

The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. What is the most likely cause?

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🔍 Key Concepts

• MF/HF transmitter and receiver signal paths (difference between transmit (TX) and audio output (AF)) • Function of the Push-To-Talk (PTT) circuit in a microphone • What a failure in the AF (audio frequency) amplifier would do to sound in the speaker

💭 Think About

• If the TX light is on, what does that tell you about whether the radio thinks it is transmitting or receiving? • What happens to the audio path and the speaker when the PTT circuit is activated continuously (stuck in transmit)? • Which fault would most directly stop you from hearing received audio, while still letting the set power up and indicate TX?

✅ Before You Answer

• Confirm whether continuous transmit would mute or disable the receiver’s AF output to the speaker • Consider whether a shorted speaker would still allow any indication on the radio’s display and TX light • Think about whether a power supply crowbar would let the radio remain powered with TX illuminated

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Question 1 of 20

The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. What is the most likely cause?

The speaker is shorted out.

A shorted Push-To-Talk circuit in the microphone .

A "crowbar" circuit in the power supply has engaged.

The final stage of the AF amplifier circuit has failed.

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Question 1 / 20Lxv7wrWShB1dOvmnhRS3

Question 1 of 20Lxv7wrWShB1dOvmnhRS3

The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. What is the most likely cause?

Back

Question 1 of 20

Lxv7wrWShB1dOvmnhRS3

The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. 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?

Quick actions

— No credit card needed