Where did the air defense sirens come from?

May 17, 2022

The one with four "big horn speakers" is called an electro-acoustic siren. Its working principle is to convert the small audio signal into sound energy after power amplification, that is, convert electrical energy into sound energy.
The installation positions of these air defense alarm speakers are determined according to the research and analysis of relevant indicators such as topography, important targets, and population distribution. In order to ensure the relative stability of the position of the alarm and facilitate later maintenance and management, it is mainly installed on the roofs of government agencies, institutions, schools, state-owned enterprises and other units, covering important economic targets and densely populated areas. The city's civil air defense department, the district (county) civil air defense department, and the alarm set-up unit are responsible for the three-level division of labor and coordination, and each performs its own responsibilities to do a good job in the maintenance and management of the alarm.
Air Raid Speaker

The implementation of the air defense alarm speaker test sound is not only to test the organization and command ability of the civil air defense headquarters, and to test the performance and effect of the air defense alarm system, but also to improve the air defense evacuation concealment skills of the general public, understand and familiarize with the air defense alarm signal regulations, and enhance national defense. Concepts and awareness of civil air defense, do not forget history, be prepared for danger in times of peace, and the alarm bells are ringing.

It is understood that the third Saturday of September every year is the National Defense Education Day, which coincides with the anniversary of the September 18th Incident.
Air Defense Alert