🔍 Key Concepts

• HF radio receiver controls: RIT/Clarifier, squelch, main tuning • Difference between improving intelligibility vs. changing channels • When it is appropriate to advise another vessel about their transmission quality

💭 Think About

• Ask yourself: which control on an HF receiver is specifically designed to fine‑tune speech clarity when you are already on the correct channel? • Would changing to an adjacent channel keep you on the same assigned working or distress frequency, or would it put you on the wrong channel? • Does squelch mainly remove background noise when nothing is being received, or does it actually correct garbled audio on a strong signal?

✅ Before You Answer

• Identify the control whose purpose is to slightly shift receiver frequency to match the transmitter. • Confirm which option would not violate channel assignments or frequency discipline. • Decide whether the problem described sounds like tuning/offset or simply noise when no signal is present.