User's Manual

13
www.jotron.com www.jotron.com
85525_UM_60S/GPS_ J
No emergency signal is transmitted during the self-test.
The battery of the EPIRB will last for at least 48 hours from activation of the
EPIRB.
1.2 SYSTEM DESCRIPTION
The Cospas-Sarsat system was introduced in 1982 as a worldwide search and
rescue system with the help of satellites covering the earth’s surface. Since the
introduction of the system more than 28000 persons have been rescued by
the Cospas-Sarsat system (2009). Currently the system consists of 5 functional
satellites in a polar orbit constellation, these satellites cover the entire earth’s
surface and receive the emergency signal from the 406 MHz transmitter within
the Tron 60S/GPS, more polar orbiting satellites will be available in the future,
giving a faster location and rescue time.
In addition several geostationary satellites are equipped with a 406 MHz tran-
sponder, these satellites are not able to locate the Tron 60S/GPS but will give
an early warning to the rescue forces, minimising the time from an emergency
occurs till the rescue forces are at the site.
Each emergency EPIRB in the system is programmed with its own unique code,
therefore it is vital that the ships data that is given to the dealer you obtained
your Tron 60S/GPS, is correct. It is also important that your EPIRB is registered
in the database for each country. This database is normally located in the same
country that the ship is registered.
1.2.1 SIGNAL DETECTION
When the Tron 60S/GPS is activated
(manually or automatically) it trans-
mits on the frequencies 121.5 MHz and
406.037 MHz. An analogue signal is
emitted on 121.5 MHz and a digital
signal is transmitted on 406.037 MHz.
After the Tron 60S/GPS is activated,
the next passing satellite will detect the
transmitted signal and relay it to an antenna at a ground station, called LUT.
The International Cospas-Sarsat System has ceased satellite processing of
121.5/243 MHz beacons from 1 February 2009.