Question 1 of 270702haR0hyWlJShbwIesz62

Which of the following conditions indicate the proper operation of a 150 Watt MF/HF transmitter in the F1B ARQ mode?

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Question 1 of 27070
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Q

Which of the following conditions indicate the proper operation of a 150 Watt MF/HF transmitter in the F1B ARQ mode?

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🔍 Key Concepts

• MF/HF NBDP (Narrow Band Direct Printing) operation and how F1B telex signals are keyed • Difference between a constant carrier and a keyed data signal on an RF power meter • What ARQ (Automatic Repeat reQuest) means for how often the transmitter actually sends RF

💭 Think About

• Think about whether an F1B ARQ telex signal is a steady unchanging carrier, or a rapid series of keyed mark/space tones that come and go with the data. • Ask yourself what the RF power meter on the transmitter actually measures: is it average RF during keying, or does it show full power only when the transmitter is keyed on? • Consider what would happen to the RF power indication when no characters are being sent in ARQ mode versus during active data bursts.

✅ Before You Answer

• Verify whether a properly operating F1B ARQ transmission should look like a solid carrier or a pulsed/variable signal on the RF power meter. • Check if an "S" meter normally reads your own transmitted power, or if it reads received signal strength instead. • Confirm that a 150 W MF/HF NBDP transmitter, when keyed with digital data, will have an RF output that is related to keying activity (data bursts), not necessarily a flat, unchanging power level.