2182 kHz is the international radiotelephone distress frequency. It is also used for a calling channel. The authorized mode of emission is H3E (single-sideband full carrier). A3E (double-sideband full carrier) is only authorized for equipment:
• GMDSS (Global Maritime Distress and Safety System) implementation and how it affected older vs. newer radio equipment • Differences between H3E (single-sideband full carrier) and A3E (double-sideband full carrier) emissions on MF distress/calling frequencies • Regulatory treatment of existing/legacy equipment versus equipment manufactured after new standards take effect
• Think about what type or age of equipment regulators are most likely to "grandfather" or allow to continue using A3E on 2182 kHz. • Ask yourself: did GMDSS standards tighten or relax the allowed emission types for newly built radiotelephone equipment on distress/calling channels? • Which option best reflects a common regulatory pattern: stricter rules for new equipment, and special allowances for certain older sets?
• Verify which emission (H3E or A3E) is stated as the standard for 2182 kHz in current regulations/guidance. • Check if there is any reference in your study materials to grandfathered MF radiotelephone equipment around the time GMDSS came into force. • Confirm whether any option suggests use only for distress/safety versus a rule based on the date of construction/sale of the equipment.
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