Sailor RM2042 User manual

S.P. RADIO A/S AALBORG DENMARK
TECHNICAL MANUAL
FOR
COMPACT VHF DSC RM2042

RM2042
9401
Service modeUser mode
INSTALLATION INFORMATION RM2042
ThisVHFDSCRM2042isdelieveredwiththeserviceswitchinpositionServiceMode.Afterprogramming
ofMMSInumbertheserviceswitchmustturnedintopositionUserMode.Pleaserefertothedrawingbelow.

RM2042
9716
CONTENTS
1 INTRODUCTION
1.1 GENERAL DESCRIPTION 1-2
1.2 TECHNICAL DATA 1-3
1.3 CONTROLS 1-4
1.4 PRINCIPLE OF OPERATION AND BLOCK DIAGRAM 1-6
2 INSTALLATION
2.1 MOUNTING POSSIBILITIES 2-1
2.2 POWER SUPPLY 2-5
2.3 HANDSET 2-5
2.4 ANTENNA 2-5
2.5 ELECTRICAL CONNECTIONS 2-6
3 SERVICE
3.1 MAINTENANCE 3-1
3.2 ALIGNMENT INSTRUCTIONS 3-1
3.3 PROPOSAL FOR NECESSARY TEST EQUIPMENT 3-2
3.4 TROUBLE SHOOTING 3-3
3.5 PERFORMANCE CHECK 3-3
3.6 ADJUSTMENT PROCEDURE 3-6
3.7 REPLACEMENT OF COMPONENTS 3-9
3.8 REPLACEMENT OF MODULES 3-9
3.9 NECESSARY ADJUSTMENTS AND CHECK AFTER REPAIR 3-10
3.10 PIN CONFIGURATIONS 3-12
4 MECHANICAL DESCRIPTION
4.1 MECHANICAL DISASSEMBLING AND UNITS LOCATION 4-1
5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS
5.1 INTERFACE (MODULE 1) PART NO. 626941 5-1
5.2 MICROPROCESSOR (MODULE 2) PART NO. 626942 5-7
5.3 RECEIVER (MODULE 3) PART NO. 626943 5-13
5.4 DISPLAY UNIT (MODULE 4) PART NO. 626944 5-23
5.6 KEYBOARD UNIT (MODULE 6) PART NO. 625636 5-27
6 MICROTELEPHONE INSTALLATION
6.1 SPECIAL INSTALLATION WITH 2 MICROTELEPHONES 6-3
6.2 SPECIAL INSTALLATION WITH 3 MICROTELEPHONES: 6-4
6.3 MECHANICAL DIMENSIONS FOR HANDSET 6-5
7 PARTS LIST

RM2042
CONTENTS
1 INTRODUCTION
1.1 GENERAL DESCRIPTION 1-2
1.2 TECHNICAL DATA 1-3
1.3 CONTROLS 1-4
1.4 PRINCIPLE OF OPERATION AND BLOCK DIAGRAM 1-6
9716

1 INTRODUCTION
The RM2042 VHF receiver modem, has been developed to fullfil the international requirements stated
by IMO, in the Global Maritime Distress and Safety System,known as GMDSS.
TheRM2042isthefirstself-containedreceiver-modemonthemarket,whichincludesaseparatereceiver
with continous watch on calling ch. 70, and a fullfeatured CLASS A modem for reception and generation
of all types of calls.
Combined with a VHF in the compact 2000 program, a complete fully automatic VHF-communication
system can be build. Furthermore the units can be combined with other compact 2000 units to form a
complete GMDSS installation.
TheRM2042combinestheIMOrequirements onsafety,withalotof userconvenientfeaturestobeused
in normal VHF-communication. And of course a high security scrambler can be combined with the
system.
This advanced communication controller uses a lot of front end technologies, including a complete new
range of components as well as the well known mechatronic design. Resulting in a high quality product,
able to withstand the harsh environmental conditions present at sea.
In spite of all the precautions taken in the design of this unit, a regular service and maintenance is
recommended, to increase unit life-time and user safety.
S.P.RadioistheEuropeanleadingmanufacturerofmaritimeradiocommunicationequipment-aposition
whichhasbeenmaintainedbymeansofconstantandextensiveproductdevelopment. Wehaveaworld-
wide network of dealers with general agencies in fifty countries. All our dealers are well-trained, and will
be able to make service on all products.
PAGE 1-1
RM2042

1 INTRODUCTION RM2042
1.1 GENERAL DESCRIPTION
RM2042 is a complete VHF receiver-modem, for digital selective calling on the VHF-channels.
RM2042 maintains a continous watch of the calling channel 70, by means of the build-in receiver.
RM2042 decodes and encodes all the messages applicable for a VHF Class A DSC-equipment, as
prescribed by international authorities.
RM2042 is intended for use, both as a part of the safety system on board, as well as a convenient
automatic calling device ship/ship, ship/shore and when implemented from land telephone
subscriber to ship.
RM2042 can be connected to the C2149 GMDSS alarm unit, for remote control of distress calls.
RM2042 has an output for an external alarm unit, indicating reception of distress calls.
RM2042 has an NMEA0183-input, for direct connection to on-board navigational equipment, giving
automatic position update in DSC calls.
RM2042 can be connected to a standard line printer for print out of received messages and other
valueable informations.
RM2042 includes as a standard, an electronic memory message bank for different kinds of calls.
RM2042 includesa userprogramable quick-callregister, notonly fornumbers, butfor completeuser
composed DSC-calls.
RM2042 includes a real-time clock with battery back-up.
RM2042 uses a fully alpha-numeric LCD-display, for read-out of all kinds of messages in plain
language.
RM2042 supplies the user with a menu-guided programming interface, making it an easy task to
compose all kinds of calls.
RM2042 can be used for channel selection on your new Compact 2000 VHF transceiver.
RM2042 is housed in a corrosion resistant metal cabinet with a green nylon finish.
RM2042 canofcoursebeusedinamanualset-up,asaDSC-encoder,providingtheconnectedVHF-
unit with key information etc.
PAGE 1-2

1 INTRODUCTION RM2042
1.2 TECHNICAL DATA
Complies with IMO, ITU, CEPT and other national requirements.
GENERAL
Operation: As CCIR Rec. 541-3
Protocol: As CCIR Rec. 493-4 as
VHF Class A equipment.
Printer Interface: Parallel Centronics.
Navigator Interface: NMEA 0183
Power Supply: 12V DC -10% to +30%
Power Consumption: Standby typ. 0.1A
Maximum 0.4A
Temperature Range: -20 C to +55 C
Dimensions: Height: 98mm
Width : 225mm
Depth : 150mm
Weight: App. 2kg.
RECEIVER WITH DECODER
Receiver frequency: 156.525MHz.
Sensitivity: Symbol error rate below
0.01 at 0.25uV pd.
Spurious radiation: Less than 2nW.
ENCODER
Modulation: 1700 Hz +- 400 Hz
1200 Baud +- 30 ppm
Output level: Adjustable between +-10 dBm
in 600 ohms balanced output.
Tx key information: Vcc or GND.
Programable encoder
output delay: 1 mSec. to 255mSecs.
PAGE 1-3

1 INTRODUCTION RM2042
1.3 CONTROLS
123
ENT
STOP
456
78 9
0
VOL
O
F
F
.
DEG
CALL
EDIT LAST
FUNC RX
MSG
NEXT
CH
VHF
ADDR
BOOK
SAILOR COMPACT VHF DSC RM2042 S.P. RADIO DENMARK
27552
STU VWX YZ-
JKL MNO PQR
ABC DEF GHI
SEND
DIS
TRESS
F
F
O
VOL
On/off/vol turn-style knob.
FUNC Selects the function menu window, from which one of seven different functions can be
selected, such as the display control functions, printer function etc.
CH
VHF Activates the VHF channel selection mode, if connected to a VHF transceiver, with serial
interface i.e. RT 2O48.
MSG
RX Selects the received message menu, which should be used for a display readout of
messages in the memory bank.
EDIT This button is used when you want to edit the content of a stored, user composed, call
sequence, or when you want to edit the position information.
TRESS
DIS Activatedalone,thisbuttonisusedtoenterthedistresscallmenu,inwhichyoucancompose
your distress message to be transmitted.
NOTE! Activated simultaneous with the SEND-button, a distress call will be initiated.
ADDR
BOOK
Selects the user programmed address book, where you can save up to forty different
complete call sequences.
CALL
Thisbuttonisusedtoenterthecallcompositionmenu,wheretheentrywillbeeitherastation
name or a MID number. If you press Edit under this menu, the following menus will guide
you through the complete composition of a call.
SEND Thisbuttonisusedtoinitiateacalltransmission,whenacallhasbeencomposedorselected.
The unit permits the transmission by an appropriate readout to guide the user.
NOTE! Activated simultaneous with the DISTRESS-button, a distress call will be initiated.
NEXT
This button is used to select the next menu in an input sequence, and at the same time the
user accepts the content of the actual display read-out.
PAGE 1-4

1 INTRODUCTION RM2042
PAGE 1-5
LAST Thisbuttonisusedtostepbackward,tothelastselectedmenuwindowinaninputsequence.
These buttons is used to scroll between the possible choices in the actual diplayed menu.
Notethatthesebuttonsonlywillbeactive,whentheirsignsareshowninthedisplayreadout.
These buttons are used to scroll between the input fields in the actual displayed menu
window. When an input has been keyed in, and the <-button is pushed the last input will be
cleared.
ABC
1Digits 0 to 9, used for numerical input data to the unit.
These characters will be selected when the user is in a mode where the unit accepts
alphabeticcharacters. At thefirst activation thefirst character willbe displayed inthe actual
displayinputfield,atthesecondactivationthesecondcharacterwillbedisplayedetc.When
‘>’-button is activated, the displayed character is selected, and the next input field is shown
with a blinking readout.
DEG
.This button is used as a delimiter, when time data or position data are entered from the
keyboard.
STOP
ENT
This key is used to accept the displayed station data in a call composition. When the data
has been accepted it will be possible to enter a telephone number, if the entered station is
a coast station.
The enter button can also be used to accept entered keyboard inputs, when valid data has
been entered in a menu window.
DEG
.Selects the degree sign in an input sequence for position data.
STOP
ENT
Stops the build-in alarm circuits, when a distress message has been received.

1 INTRODUCTION RM2042
1.4 PRINCIPLE OF OPERATION AND BLOCK DIAGRAM
RECEIVER
The RF-signal from the antenna is feed to the input amplifier circuit. Here is the initial filtering made by
meansofafixed,double tunedfilterbeforethesignalisamplifiedinthe front-endamplifier.Thisamplifier
is followed by another fixed, double tuned filter. The amplified and filtered signal is feed to the first mixer
stage.
This stage converts the received signal to the first IF frequency on 15.3 MHz. The local oscillator for
this stage is created by means of an XTAL oscillator running at 141.225MHz.
Thesignalis filtered by means of an XTAL-filter, amplified and then feed to theintegrated IF-circuit. This
circuit includes the second XTAL-oscilllator circuit running at 14.85MHz, the second mixer stage and
following limiting amplifiers and detector circuits.
The filtering on the second IF-frequency at 450kHz, is made by means of a ceramic filter.
The detected AF-signal is led through an electrical controlled switch, which is only used for loop back
testpurpose.Theoutputfromthisswitchisfilteredinthedeemphasisfilter,beforetheAFsignalselection,
where the selection between the build-in channel-70 receiver and the connected VHF radiotelephone is
performed.
TheswitchsettingoftheAFselectionisdeterminedbytheactualoperationoftheunitandsignalstrength
on Channel-70, giving full priority to the Channel-70 receiver output.
From the connected VHF-radiotelephone, the detected AF-signal is feed to a deemphasis filter and a
carrierdetectcircuit,whichprovidestheneededsignalsforthedemodulatorwhenyouareusingthepublic
call facilities.
The selected AF-signal is furthermore feed to the interface board, where it is amplified to source an
internal loudspeaker.
The FSK-modem performs the demodulation of the received FSK-signal, and the modulation of the AF-
signal for the transmitter. The circuit is controlled from the microprocessor board.
Internal power supply for the board, is generated with two regulators, one for 5V and one for 10V.
Apowerlowconditionissignaledfromthe10Vregulatortothemicroprocessorunit,tosecureacontrolled
power down sequence.
INTERFACE
This module provides the necessary connections between the modules and between the modules and
theexternallyconnectedequipment,suchaspowersupply,VHF-transceiver,telephonehandset,printer
etc.
Thisunitmustbesuppliedwith12VDC,whichcanbeprovidedeitherdirectlyfrombatteriesorfromN420,
24to12Vconverter.TheproperoperationoftheON/OFFswitchisselectedbymeansofthe12/24Vwiring
circuit.
Fuse and over/reverse-voltage protection is placed on this module as well.
The 5V power supply for internal digital boards are made on this unit.
The AF power amplifier for the loudspeaker is supplyed by its own 5V regulator and the AF comes from
the receiver module. Alarm and mute signals are generated on the microprocessor module and feed to
the amplifier chain.
Distress channel information for a connected scrambler, is buffered and level shifted, before it is feed
to the 9-pole connector.
AF output for the connected transmitter is buffered and level adjusted in different amplifiers.
When the unit is operating in an automatic system with a VHF-transceiver, is the AF output delivered
as an unbalanced signal adjusted in level to fit the microphone input sensitivity of the transceiver.
Whenthe unit is operating as a DSC-encoder isthe AF output port swiched to supply thesignalon a 600
ohm balanced output port. The level can be adjusted to 0dBM 10dB by means of a trimming
potentiometer.
When the VHF port communication switch is set for an automatic system, the serial communication link
to the transceiver will be connected to the 9 pole output connector for the VHF.
The remaining circuits on this module consists of input buffers and level shifters for the i/o links to the
microprossor. These links are used for the NMEA interface, printer interface and the interface to C2149,
remote distress unit, or a PC for programming or remote control.
PAGE 1-6

1 INTRODUCTION RM2042
MICROPROCESSOR
The microprocessor module contains as the central unit, the microprocessor IC, a fast 16 bit type, with
its external program memory and RAM circuits.
The microprocessor clock-signal is derived from an 8 MHz XTAL-oscillator.
Thenon-volatilememoryconsistofasingle8kByteEEPROM,wherethereceivedmessagesandinternal
programable settings are stored.
As the microcomputer operates with an asyncroneous bus-configuration, some external control logic
isneeded togenerate theappropriate interruptsignals etc.This blockincludes theresetcircuitry aswell.
Addressselectionoftheindividualperipheraldevicesisdonebymeansofa4to16lineaddressdecoder.
The answer back from these circuits to the microprocessor, is done via the uP control logic.
The time division on the microprocessor is partially determined by the outputs from the programable
timers, and partially by the real time clock circuit.
The real time clock circuit is operating with an external XTAL at 32.768kHz, and has a separate primary
battery back-up, to preserve the time settings of the equipment.
The reference clock for the FSK decoder and encoder, is derived from a 4.9152MHz XTAL oscillator,
which among others are devided down to a 1200Hz signal.
Communication with the FSK-modem is done via an USART.
Theprinterinterfaceismadebymeansofastandardi/oportcircuit,placedontheinterfacemodule,while
the strobe pulse needed for the printer is generated by a few gates on this module.
Theserialcommunicationwithexternalequipment,isexecutedviathreeUSART’splacedontheinterface
module.
Ani/oport circuit,is usedfor theinterfacebetween themicroprocessor andthe differentsinglebit control
signals. The same circuit is used when the keyboard matrix are scanned.
Thismoduleincludes,aswell,the+5Vto-5Vvoltageconverter,theoutputofwhichisusedonthedisplay
module for the LCD-display.
The voltage for the keyboard light, for night illumination, are also turned on and off on this module.
The switch S1 is used in service.
DISPLAY UNIT
The display unit consist of two circuit boards.
One board connected directly to the microprocessor module. Which includes a D/A converter to control
the DC-amplifiers for viewing angel control and display backlight control, and a socket for connection
to the display module.
The display is a standard dot-matrix LCD-display module, which includes the necessary drivers and
parallel communication circuits.
Power on/off switch and AF-volume potentiometer is mounted on this unit as well.
ThisunithasbeendevelopedtobeusedinRM2150/51aswell,theidentityprogrammingneededismade
by means of a jumper on P5.
KEYBOARD
The keyboard module is a standard module for the 2100-series of products. It consist of a 4x7 keybord
matrix, and light emitting diodes used for night illumination of the keyboard.
PAGE 1-7

1 INTRODUCTION RM2042
PAGE 1-9
BLOCK DIAGRAM RM2042
amp.
Rx
Keyboard
matrix
backlight
Keyboard
Display
backlight
contrrol
View angel
LCD
Display
module.
+5V
control
First
mixer
Buffer
amp.
osc.
1’st local
141.225 MHz
amp.
15.3MHz
IF-filter & & osc.
2’d Mixer AF-detect
Limit amp.
RF-level det.
2’d IF-
450kHz
filter Detect
Carrier
Modulation
det. logic. FSK modem.
Rx-AF
filter-6dB/oct.
AF-filter
gen.
Power fail
+10V reg.
+5V reg.
reset
Power
failure
reg.
+5V12V/24V
Wiring circ.
Fuse/rev.
voltage switch
port conn.
VHF-
Ext.alarm.
ch.inforn.
Distress
VHF-
serial com.
AF-amp
w.mute.
Tx-AF
amps. NMEA data intf.
Printf. Intf.
&C2149/
PC intf.
XTAL
8.000MHz
osc.
PROM
memory EPROM memory
RAM
memory
4.9152 MHz
XTAL osc.
&
I/O
ports
divider
int.f.
commuc.
Modem uP.
unit. decoder select
Cicuit
gen.
pulse
strobe
Printer uP
control
logic.
w.reset
Program
able
timers
32.76kHz
clock
Real time
converter
VoltageKeyboard
light on/off
Power con.
P3 J1
Handset VHF
P2 PRINTER J4 J3
C2149/PC NMEA
J2
+5V
1
2
4
9
259
216
7
1 1
11
3
2
31
11
1
1
2
13
2
1
2
+5V
12
6
+5V
1
+10V
28
14.850MHz
+5VVcc
VOL ON/OFF
S1
P5
2
Carrier
Detect
logic.
AF-Switch
Control
-6 dB/oct.
AF-filter
filter
Tx-AF
protection
11
2
3
1
2
I/O-Ports
27502
RECEIVER
(MODULE 3)
(MODULE 1)
INTERFACE
(MODULE 6)
KEYBOARD
DISPLAY UNIT
(MODULE 4)
(MODULE 2)
MICROPROCESSOR
+
-

RM2042
CONTENTS
2 INSTALLATION
2.1 MOUNTING POSSIBILITIES 2-1
2.2 POWER SUPPLY 2-5
2.3 HANDSET 2-5
2.4 ANTENNA 2-5
2.5 ELECTRICAL CONNECTIONS 2-6
9716