The call sign suffix AA shall be used in forming the collective call to which group?

The call sign suffix AA shall be used in forming the collective call to which group?

• A. all reserve stations in this district
• B. all active duty stations nationwide
• C. all commercial vessels in port
• D. all shore facilities in the district

Answer: (A)

Collective calls use a suffix attached to a station’s call sign to target a specific group of stations. The suffix AA designates all reserve stations within the district, so using this suffix addresses every reserve unit in that geographic area with a single transmission. This makes coordination for district-level tasks or emergencies efficient, since messages reach all relevant reserve stations at once instead of sent individually. Other groups, such as active-duty stations nationwide, commercial vessels in port, or shore facilities in the district, would require different group designators, not this particular suffix. So the suffix AA is specifically used for all reserve stations in the district.

Collective calls use a suffix attached to a station’s call sign to target a specific group of stations. The suffix AA designates all reserve stations within the district, so using this suffix addresses every reserve unit in that geographic area with a single transmission. This makes coordination for district-level tasks or emergencies efficient, since messages reach all relevant reserve stations at once instead of sent individually. Other groups, such as active-duty stations nationwide, commercial vessels in port, or shore facilities in the district, would require different group designators, not this particular suffix. So the suffix AA is specifically used for all reserve stations in the district.