Which of the following conditions could...

Question 1 / 27070NGH9kjhCXUfBiXlDEKz7

Question 1 of 27070NGH9kjhCXUfBiXlDEKz7

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?

Question 1 of 27070

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?

🔍 Key Concepts

• MF/HF transmitter power path from RF power amplifier to the antenna • Effect of SWR (Standing Wave Ratio) on RF output delivered to the antenna system • Purpose and behavior of a dummy load compared with a real antenna

💭 Think About

• Trace where in the system the RF power is measured in this question: inside the transmitter stages, or actually delivered to the antenna system? • Ask yourself which option represents a normal condition sometimes used in a radio room, rather than an internal failure, that would still result in very low radiated RF. • Which of these conditions would safely absorb most of the RF power without radiating it, and thus appear as "very low RF output" from the perspective of the antenna system?

✅ Before You Answer

• Clarify whether "very low RF output" refers to output from the final RF stage, or RF actually going to the antenna/air. • Review what a high SWR does to transmitter output power and how many modern radios respond to it (e.g., fold‑back power). • Recall the primary function of a dummy load and how it affects radiated RF compared to indicated transmitter power.

Question 1 of 27070

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?

Failure of a voltage controlled oscillator in the IF amplifier stage.

A high Standing Wave Ratio ( SWR ) in the antenna system .

The connection of a transceiver is connected to a "Dummy Load" antenna.

Failure of a SSB bandpass filter in the stage preceding the RF amplifier.

Question 1 / 27070NGH9kjhCXUfBiXlDEKz7

Question 1 of 27070NGH9kjhCXUfBiXlDEKz7

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?

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Question 1 of 27070

Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?