Question 6A612

A survival craft equipped with a non-portable radiotelegraph installation needs a simple, robust antenna system capable of effective distress communication across a range of MF/HF frequencies. The **single wire inverted L antenna** is specified because it is a practical, effective design for emergency use. Its configuration allows for maximum practicable length and height on a small vessel, optimizing radiation efficiency for the lower MF/HF distress frequencies without requiring complex tuning. This design prioritizes reliability and ease of deployment under emergency conditions. **A) The minimum lifeboat antenna requirement is an HF half-wave dipole capable of efficiently tuning distress frequencies:** This is incorrect. A half-wave dipole is highly resonant at a specific frequency, making it unsuitable for the broad range of distress frequencies without complex and unreliable tuning mechanisms. **C) The antenna must be tested at least once during each voyage and a minimum of once a week on longer voyages:** This describes maintenance requirements, not the type or design of the antenna itself. **D) The antenna must be located a minimum of 8 meters above the waterline to insure the safety of passengers:** This is incorrect. While height improves performance, an arbitrary 8-meter minimum is often impractical or impossible on many survival craft. The primary concern is communication effectiveness, and "maximum practicable height" is the realistic requirement.