RANGERNeo : field strength meter supporting EWBS
What does EWBS stand for and what does it mean?
The EWBS signal (Emergency Warning Broadcast System) is a system for warning and information that is implemented in analogue and digital broadcasting. In an emergency, devices compatible with this system automatically turn on and emit an audible warning. Then they show information in different formats, depending on the device.
September 1, 1985, NHK public broadcaster in Japan launched the EWBS system. The first real use was in 1987, to warn of tsunami. Since then it warned of natural disasters in more than 15 times. With this system the population has more time to take protective measures, avoiding the death of thousands. In 2000 the digital version of EWBS for digital satellite television (ISDB-S) was implemented and in 2003 for digital terrestrial television (ISDB-T).
In an emergency, devices compatible with this system automatically turn on and emit an audible warning
EWBS Warning System operation
The EWBS is enabled in the following cases:
- Earthquake warning / forecast (over level 3).
- Tsunami warning / forecast.
- Warnings and forecast of other natural disasters such as typhoons, floods, eruptions ...
- National emergency message from government.
In digital broadcasting, the EWBS signal is multiplexed into the transport stream of the ISDB-T/ S digital signal. The warning signal and emergency information descriptor (area code, time, etc) is in the Program Map Table.
RANGERNeo: field strength meter supporting EWBS
The signal transmitted by modulators and transmitters can be detected by RANGERNeo ISDB-T field strength meters. This feature is useful for operators and maintenance staff in order to check that signal is sent and received.
With a RANGERNeo field strength meter EWBS signal can be checked
Reception, decoding, and measurement of an ISDB-T channel with EWBS warning signal during an earthquake in the display of a RANGERNeo 2 ISDB-T / Tb field strength meter.