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Question 1 of 20vxEHJ3IRc8aJzbtOUVLs

which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?

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Question 1 of 20

vxEHJ3IRc8aJzbtOUVLs

which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?

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🔍 Key Concepts

• F1B FEC mode uses frequency-shift keying (FSK) for narrow-band direct-printing (NBDP) / telex-style signals, not voice FM • Typical transmitter troubleshooting steps: visual checks, power supply verification, and signal tracing with an oscilloscope • The difference between testing frequency deviation (FM) and observing FSK keying/shift on an MF/HF digital transmitter

💭 Think About

• Ask yourself: In F1B FEC mode, what kind of modulation is actually being used on the RF carrier? Is it FM with deviation, or keyed frequency shift between mark and space? • Which test instrument and procedure is mismatched with the type of modulation used in an MF/HF F1B digital transmitter? • For each option, imagine you are a technician: would that method realistically help locate a fault in any RF transmitter, regardless of specific mode, or does one option test for the wrong characteristic entirely?

✅ Before You Answer

• Verify what F1B means in ITU emission designators (what the "1B" indicates about modulation and nature of signal). • Check which methods (visual inspection, DVM checks, oscilloscope probing) are generic, valid troubleshooting tools for almost any transmitter. • Identify which choice refers to measuring frequency deviation, and confirm whether deviation is the correct parameter for an MF/HF FSK (F1B) signal.

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Question 1 of 20vxEHJ3IRc8aJzbtOUVLs

which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?

Back

Question 1 of 20

vxEHJ3IRc8aJzbtOUVLs

which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?

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