What is the significance of tone and volume in 900 code transmissions?

• A. To ensure messages sound urgent.
• B. To fill airtime without distortion.
• C. To ensure transmission is legible and authoritative while avoiding distortion.
• D. To impress listeners with formality.

Answer: (C)

The main idea is that tone and volume determine how clearly a radio message is heard and how professional it sounds. In 900 code transmissions, messages are brief and rely on precise words, so a steady, confident tone helps convey authority and reduces the chance that instructions are misinterpreted. Volume control is crucial too: it must be high enough to be heard over noise but not so loud that the signal clips or distorts, which would garble the message. When both are set correctly, the transmission comes through as legible and authoritative while avoiding distortion. Urgency, filling airtime, or excessive formality aren’t the primary goals; the priority is clear, reliable communication.