jotron FB-40, Руководство пользователя

Страница: 15 / 48

Doc. No.: 87634 Rev. G
jotron.com
Page 15 of 48
In addition, several geostationary satellites are equipped with a 406 MHz
transponder. These satellites are not able to locate the Tron 40VDR but will
give an early warning to the rescue forces, minimizing the time from an
emergency occurs till the rescue forces are at the site.
Each EPIRB in the system is programmed with its own unique code,
therefore, it is vital that the ships data supplied to the dealer upon
purchase or when the Tron 40VDR was obtained is correct. It is also
important that the EPIRB is registered in the database for each country.
This database is normally located in the same country where the ship is
registered.
5.3.1 Signal detection
When a Tron 40VDR is activated (manually or automatically) it transmits an
analogue signal on the 121.5 MHz frequency and digital signal on the
406.037 MHz frequency. After the Tron 40VDR is activated, the next
passing satellite will detect the transmitted signal and relay it to an antenna
at a local user terminal (LUT) ground station.
Figure 3 Illustration - signal detection