How many meters is an air defense alarm, and where is the air defense alarm generally located?

There is no uniform standard, for example, in rural areas.

In wartime, communications, radio, and television systems must give priority to transmitting and issuing air defense warning signals, and auxiliary means such as whistles, horns, and bells and gongs can also be used. According to the location of the sound alarm, it is divided into fixed and mobile; According to the energy conversion mode, it is divided into electric type, electroacoustic type, pneumatic type and hand-cranked type.

Air defense warning facilities must be kept in good use, and the issuance and transmission of alarms must be fast and accurate, using a variety of means at the same time; Strengthen communication and liaison with superiors and subordinates and friendly neighbors, receive air raid intelligence information at any time, strengthen the observation of air targets, and report air raid intelligence in a timely manner; Depending on the situation and duration of the air raids, a warning signal will be issued in a timely manner.

With the increase in the suddenness of air raids, the increase in the means of strikes, and the expansion of sabotage intensity, the importance of air defense warnings is being paid more and more attention, and the requirements for the accuracy, timeliness, and continuous issuance of air defense warnings are higher, and the methods of issuing air defense warnings will also become more flexible and diverse along with the construction and improvement of communications and networks.

Hello One siren covers a range of several hundred meters, that is, one in the city center. Yesterday was 918, the alarm will last for 15 minutes, and many drivers also stopped and honked their horns, reminding the public to be prepared for danger in times of peace and not to forget the national shame. Hope.

Air defense sirens are distributed in various areas of the city, with multiple sound points. Moreover, there are two kinds of air defense sirens: fixed and mobile, and the mobile siren is mainly to install the air defense siren on the car. In addition, whistles, wired and wireless radio, television, the Internet, and bells and gongs can also be used as auxiliary equipment and means for alarms.

The sound and tone of the air raid siren is the process of going from low to high to low, and this format is so simple that it is easy to identify by non-old oaks. Since this frequency transmission is relatively stable over a long distance, it is very effective to use it as an alarm signal to transmit important information.

The number of air defense sirens installed in each city is not fixed and is determined mainly by the size of the city and the coverage of the city. The installation of an air defense alarm is based on the characteristics of sound transmission, the selection of a location at the appropriate height, the installation of an air defense alarm.

It is generally installed near the living areas of ordinary people, and some are installed on residential buildings. And these devices are just an ordinary power amplifier and a control system, which are usually in standby mode and do not work. In practice, this system mainly receives the control instructions issued by the control center and makes sounds according to the instructions.

To put it simply, there are several more sirens every day, so the number of sirens is unknown, and the world is constantly evolving, so the number is very so.

The radius is 3,000 kilometers.

The anti-aircraft alarm device is mainly composed of bass and can be transmitted over long distances. Secondly, the entire city is reticulated with air defense alarm facilities, so that the siren sound can be heard clearly in every corner of the city.

Air Raid Alarm: Sound for 6 seconds, stop for 6 seconds, repeat 15 times for 3 minutes. Those who are unable to enter underground air-defense bunkers, civil air defense projects, and air-raid bunkers should take advantage of the nearest terrain and ground objects to hide, and lie on the ground with their heads in their hands.

Dismiss alarm: Sound a long sound continuously for 3 minutes. Citizens can get out of underground air-raid bunkers, civil air defense projects, and air-raid shelters and resume normal work.

There are three types of civil air defense alarms: early warning, air raid warning, and disarming alarm. The interval between a long alarm tone and no sound is relatively long, and it is an advance alarm. The sound interval is particularly short, high and low, sounding for 6 seconds and stopping for 6 seconds, 15 consecutive cycles, three minutes, it is an air raid siren.

A particularly long sound, not interrupted in the middle, ringing continuously for three minutes, is to disarm the alarm.

The role of air defense alertsWhen hearing the advance alarm, if the public is at home, they should turn off the water, windows, and gas, carry a rescue emergency kit, and go downstairs in an orderly manner. When the air raid siren sounded, the citizens entered the civil air defense project in an orderly manner according to the evacuation plan and concealed it. When the alarm is lifted, citizens can leave the civil air defense concealment project in an orderly manner.

The air defense alarm is an important part of the city's civil defense project, and it is an alarm that sounded to remind people to evacuate from the air when the city is threatened by air raids. Air defense sirens are used not only in wartime, but also in non-war times to commemorate certain important events.

<> air defense alarm is an important part of the urban air defense project, peacetime for disaster relief and emergency reporting in the case of sudden accidents, civil air defense, is the basic means for the people at all levels to implement civil air defense command, organize personnel evacuation, is the city is threatened by air raids to remind people of air defense.

Air defense alertClassification:

According to the timing of the alarm, it can be divided into advance warning, air raid alarm and alarm lifting.

The function of the early warning signal is to inform citizens to prepare for air raids in advance in case of possible air raids on the city. The sound signal is: 36 seconds to stop for 24 seconds, repeat 3 times, 3 minutes, the main thing is to talk about the early forecast when the city has signs of air raids, prompting people to implement protection or emergency evacuation.

The function of the air raid warning signal is to inform the public to quickly take protective measures such as evacuation and shelter when the air raid is close to the sky over the city and the air raid is about to occur or has begun. The sound signal is: 6 seconds, stop for 6 seconds, repeat 15 times for a cycle, the time is 3 minutes.

There are three types of alarm signals: advance warning, air raid alarm, and disarming alarm, depending on the duration of the alarm and the length of the interval. The pre-alarm is a long sound for 36 seconds, a stop for 24 seconds, and repeated three timesLasts 3 minutes; The air raid siren is a short sound for 6 seconds, a stop call for 6 seconds, repeated 15 times, for 3 minutes; The alarm is discontinued for 3 minutes.

The whole process will be sounded in order to sound the advance alarm, air raid alarm, and release the alarm, and this is a round, and the sound is repeated three times, lasting for more than one hour.

Air defense alertIt is an important part of the urban air defense project, and is used in peacetime for disaster prevention and relief and disaster forecasting and emergency reporting in the case of sudden accidents, and is used in civil air defense in wartime, and is the basic means for the people at all levels to implement civil air defense command and organize personnel evacuation, and it is a warning to remind people of air defense when the city is threatened by air raids.