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 TM 11-5895-1847-12&P
0003 00
DESCRIPTION OF THE DSC CONTROLLER
The MF/HF DSC controller (10), located in the 9701 GMDSS console, is composed of a transceiver and an antenna.
The DSC controller provides enhanced distress calling capability. The distress call is received by every ship and coast
station monitoring the international distress frequencies. The DSC controller repeats a transmitted distress message
every four minutes until it is acknowledged. The DSC controller incorporates the GPS signal from the PLGR to insert
the vessel's position automatically into a distress message. An alarm sounds when incoming messages are received.
Unanswered calls are logged for automated call back. Routine calls can be transmitted and received between DSC
equipped vessels or Coast Earth Stations (CES). Once the call is received by the intended party an acknowledgement
is transmitted to the sender of the call leaving no doubt whether the call was received. Because each station has a
unique DSC number, only the intended party will respond to the call. All ships calling is also provided. The all ships
format is useful for initiating safety messages, such as weather reports and navigational warnings.
DESCRIPTION OF THE SERIAL PRINTER
The serial printer (11), located on the bulkhead below the PLGR, is a dot matrix printer capable of printing
240 characters per second in draft mode. The serial printer prints information received from the DSC controller.
DESCRIPTION OF THE COMMUNICATIONS PLGR
The communications PLGR (12), located on the bulkhead above the serial printer, supplies GPS position to the DSC
controller, satellite communications system and the DSC VHF/FM transceiver through the communications interface
and switchbox. 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, receives the GPS signal from the interface and
switchbox and returns the ship's position to the interface and switchbox for distribution to DSC controller, satellite
communications system and the DSC VHF/FM transceiver. The communications PLGR may be used to mark the
position of a man overboard and provide route navigation when properly programmed.
DESCRIPTION OF THE COMMUNICATIONS INTERFACE AND SWITCHBOX
The communications interface and switchbox, located on the shelf behind the 9701 GMDSS console, is an interface
between the communications PLGR, the ship's power supply and the GPS antenna. The communications interface
and switchbox is also a switchbox that turns power on or off to the communications PLGR, allowing the PLGR to be
programmed by the INMARSAT-C data terminal, and allows the operator to turn the position signal on or off to the
DSC controller, satellite communications system and the DSC VHF/FM transceiver. The communications interface
and switchbox also allows input of differential GPS data to the PLGR.
DESCRIPTION OF THE GMDSS AUTOMATIC POWER SWITCH
The GMDSS automatic power switch (13), located on the bulkhead below the 9701 GMDSS console shelf, provides
automatic switching of power for the GMDSS. Power from the GMDSS power supply and the GMDSS DC converter
are connected to the automatic power switch. The GMDSS power supply is the primary power source for the
GMDSS. In the event that the GMDSS power supply fails to produce electrical power, the automatic power switch
closes the circuit to the GMDSS power supply and opens the circuit to the GMDSS DC converter. The GMDSS will
then receive power from the Direct Current (DC) converter until power is restored from the power supply. The
automatic power switch alarm will be activated when the GMDSS is receiving power from the DC converter. One of
two alarm modes may be selected by the user: warning light and buzzer or warning light only.
DESCRIPTION OF THE GMDSS POWER SUPPLY
The GMDSS power supply (14), located below the 9701 GMDSS console shelf, receives 115 vac power from the
ship's alternating current power circuit and converts the power to 13.6 vdc. The power supply output is wired to the
GMDSS automatic power switch. The power supply furnishes power to the 9701 GMDSS console, the
communications interface and switchbox and the RT-1600/U receiver-transmitter.
0003 00 3
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