| Tweet |
Custom Search
|
|
|
||
 0003 00
TM 11-5895-1847-12&P
DESCRIPTION OF THE GMDSS DC CONVERTER
The GMDSS DC converter (15), located below the 9701 GMDSS console shelf, receives 24 vdc power from the
ship's GMDSS emergency batteries and converts the power to 13.6 volts direct current (vdc). The DC converter is
wired to the GMDSS automatic power switch. The DC converter furnishes power to the 9701 GMDSS console, the
communications interface and switchbox and the RT-1600/U receiver-transmitter in the event that the GMDSS power
supply fails to produce power.
DESCRIPTION OF THE GMDSS JUNCTION BOX
The GMDSS junction box (16) is located below the serial printer. The GMDSS junction box contains a terminal
block to interface power received from the automatic power switch to power cables for the communications interface
and switchbox and the 9701 GMDSS console.
DESCRIPTION OF THE NAVIGATION PLGR
The navigation PLGR (17), located next to the chart table on the starboard side of the pilothouse, supplies GPS
position for navigation. The PLGR receives GPS data from the GPS antenna located on the mast. A PLGR interface
cable receives power for the PLGR from the interface and switchbox and receives the GPS signal from the interface
and switchbox. The navigation PLGR may be used to mark the position of a man overboard and provide route
navigation when properly programmed.
DESCRIPTION OF THE NAVIGATION INTERFACE AND SWITCHBOX
The navigation interface and switchbox (18), located next to the chart table on the starboard side of the pilothouse, is
the interface between the navigation PLGR, the ship's power supply and the GPS antenna. The navigation interface
and switchbox is also a switchbox which turns power on or off to the navigation PLGR and allows the PLGR to be
programmed using a data terminal for route navigation. The navigation interface and switchbox also allows input of
differential GPS data to the PLGR.
DESCRIPTION OF THE NAVIGATION DC JUNCTION BOX
The navigation DC junction box (19) is located below the NAVTEX receiver. The junction box is used to attach the
NAVTEX and navigation interface and switchbox power cables to the navigation power supply power cable.
DESCRIPTION OF THE NAVIGATIONAL TELEX (NAVTEX) RECEIVER
The NAVTEX receiver (20) is located on the starboard side of the pilothouse below the weather facsimile. The
NAVTEX receiver is a narrow band radio teletype system for sending, by frequency shift keying, text messages
expressed in a seven unit code. The NAVTEX transmitter transmits a nine control character header code ahead of the
main message so that the receiver can identify the station, message type and serial number automatically. For
automatic identification of messages, each message starts with nine control characters, called a header code. The first
five characters are always ZCZC_. The latter four characters of the header code indicate origin, category and serial
number of the message. The NAVTEX receiver selectively acquires stations and types of messages specified by the
operator. Message types A (navigational warnings), B (meteorological warnings) and C (ice reports) cannot be
switched off by the operator. Message type D (Search and Rescue (SAR) information) will be printed immediately,
the NAVTEX alarm buzzer will sound and the SAR warning Light Emitting Diode (LED) will light. When an
abnormal character is received due to noise interference it will be printed as an asterisk. A message having serial
number "00" (emergency message) will be reprinted. Message types A, B, D and L, or serial number "00" from
rejected stations will be printed. Message type D will be printed up to 2,000 characters regardless of character error
rate. The NAVTEX receiver may be preset to stop printing when the error rate is above thirty-three percent.
0003 00 4
|
||
|
||
