What frequency is the EAS alarm?

The Emergency Alert System (EAS) in the United States uses a variety of frequencies for transmitting emergency alerts to the public. The specific frequency depends on the type of communication method being used within the EAS system.

1. Broadcast Radio and TV Stations:

  - EAS messages are typically transmitted to the public through broadcast radio and TV stations. These stations operate within designated frequency bands. For example, AM radio stations generally operate in the frequency range of 540 kHz to 1700 kHz, while FM radio stations operate in the range of 88 MHz to 108 MHz. VHF and UHF TV stations operate at various frequency bands.

2. NOAA Weather Radio:

  - The National Oceanic and Atmospheric Administration (NOAA) Weather Radio is another component of the EAS. NOAA Weather Radio broadcasts weather information, including emergency alerts. The frequencies used by NOAA Weather Radio stations are in the VHF band (162.400 MHz to 162.550 MHz).

3. Wireless Emergency Alerts (WEA):

  - WEA, also known as Wireless Emergency Alerts, is a part of the EAS that delivers emergency alerts to mobile devices. WEA messages are sent via cell broadcast technology, and the specific frequency is not publicly disclosed. Instead, it is broadcast on a dedicated channel within the wireless carrier's network.

It's important to note that the EAS operates using a combination of broadcast, cable, satellite, and wireless communication methods. The frequencies used may vary depending on the specific medium through which the emergency alert is being transmitted. The EAS is designed to ensure that emergency messages reach the public through multiple communication channels, increasing the likelihood that people receive timely and accurate information during emergencies.