Sailor RT2048 VHF User manual

INSTALLATION MANUAL
SAILOR RT2048 VHF
M2048GB-0.indd iM2048GB-0.indd i 18-08-2006 14:26:3418-08-2006 14:26:34

Disclaimer
Any responsibility or liability for loss or damage in connection with the use of this product and the accompany-
ing documentation is disclaimed by Thrane & Thrane. The information in this manual is provided for information
purposes only, is subject to change without notice, may contain errors or inaccuracies, and represents no com-
mitment whatsoever by Thrane & Thrane. This agreement is governed by the laws of Denmark.
Manuals issued by Thrane & Thrane are periodically revised and updated. Anyone relying on this information
should satisfy himself/herself as to the most current version. Providers with access to Thrane & Thrane’s Ex-
tranet may obtain current copies of manuals at: http://extranet.thrane.com.
Thrane & Thrane is not responsible for the content or accuracy of any translations or reproductions, in whole or
in part, of this manual from any other source.
M2048GB-0.indd iiM2048GB-0.indd ii 18-08-2006 14:26:5118-08-2006 14:26:51

RT2048
CONTENTS
1. INTRODUCTION 1-1
1.1. GENERAL DESCRIPTION 1-2
1.2. TECHNICAL DATA 1-3
1.3. CONTROLS 1-4
1.4. PRINCIPLE OF OPERATION 1-6
2. INSTALLATION 2.1
2.1. MOUNTING POSSIBILITIES 2-2
2.2. HANDSET 2-6
2.3. MICROTELEPHONE CONNECTOR 2-6
2.4. POWER SUPPLY 2-6
2.5. POWER CONNECTOR + EXT. LOUDSPEAKER 2-7
2.6. ANTENNAS 2-7
2.7. SPECIAL OPTIONS 2-7
2.8. REAR VIEW OF VHF RT2048 2-11
2.9. STANDARD FREQUENCY TABLE 2-12
3. SERVICE 3-1
3.1. MAINTENANCE 3-1
3.2. ALIGNMENT INSTRUCTIONS 3-1
3.3. PROPOSAL FOR NECESSARY MEASURING INSTRUMENTS 3-1
3.4. TEST PROBE 3-2
3.5. ADJUSTMENT PROCEDURE 3-2
3.6. TROUBLESHOOTING 3-3
3.7. REPLACEMENT OF COMPONENTS 3-4
3.8. REPLACEMENT OF MODULES 3-4
3.9. NECESSARY ADJUSTMENTS AFTER REPLACEMENT
OF MODULE 3-4
3.10. PIN CONFIGURATIONS 3-5
4. MODULE LOCATION 4-1
4.1. MECHANICAL DISASSEMBLING RT2048 4-2
5. CIRCUIT DESCRIPTION AND SCHEMATIC DIACRAMS 5-1
5.1. KEYBOARD UNIT (MODULE 1) 5-1
5.2. INTERFACE UNIT (MODULE 2) 5-3
5.3. SYNTHESIZER UNIT (MODULE 3) 5-6
5.4.
5.5.
5.6. INTERCONNECTION CABLE DIAGRAM
6. MICROTELEPHONE INSTALLATION 6-1
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 7-1
Appendix A - ATIS OPTION (OPTIONAL)
Rx/Tx UNIT (MODULE 4) 5-12
SELCALL UNIT (MODULE 5) OPTIONAL 5-18
5-20
0820

0820 Page1-1
RT2048
1. INTRODUCTION
TheRT2048VHFradiotelephonehasbeendesignedtocomplywiththeincreasingdemandsofahighlytechnological
product, which means high quality, small size, etc.
TheRT2048isfurthermoredesignedtofitintotheCompact2000moduleprogramme.
TheRT2048 can eitherbe installed andoperated as anindependent unit, orin combination withother elements of
theCompact2000programme.TheseincludeaDuplexVHFradiotelephone,acoasttelephonestationwitha400W
PEPSSBtransmitterandanSSBreceiverwithbuilt-inFMandAMbands,andascramblerwhichensurescomplete
communicationsecrecy.
The VHF RT2048 has, by means of the latest technology in casting technique, been constructed to withstand the
mostextremeconditionsexperiencedinsmall,semi-openboats.Theprintedcircuitsinside aredesignedwithahigh
degreeofcompactnessandexceptionalperformance.
In the design of this VHF radiotelephone, Thrane & Thrane have taken into account all the circumstances it will be
exposed to in day-to-day operation. However, even a product of this high quality requires regular servicing and
maintenance, and we recommend a close observance of the directions contained in the instruction book.
Thrane&ThraneisoneofEurope’sleadingproducersofmaritimeradiocommunicationequipment-apositionwhich
hasbeenmaintainedbymeansofconstantandextensive product development. We have a world-wide network of
dealerswithgeneralagenciesinfiftycountries.Allourdealersarewell-trainedandabletoserviceallThrane&Thrane
products.

1INTRODUCTION RT2048
1.1. GENERAL DESCRIPTION
VHFRT2048isanallsolidstateconstructedmicrocomputercontrolledVHFradiotelephone,intendedforship/ship
andship/shorecommunication.
VHFRT2048 can operatein both simplexand semi-duplex mode.
VHFRT2048includesall55 international and U.S. VHF marine channels, and isasstandardpreparedfor up to 10
private channels, selected as simplex or semi-duplex channels in the frequency band 154.4 -
163.75MHz.
VHF RT2048 is equipped with flexible scanning facilities or additional 30 private channels in the above mentioned
frequencyband.
VHFRT2048hasbuilt-indualwatchfacility,whichenablestheoperatortolistenoutontwochannelssimultaneously
(theselectedchannelandaprogrammablepreferencechannel-normallychannel16).
VHF RT2048 is provided with a quick select channel, normally channel 16.
VHF RT2048 is provided with continuous turn-style operation of SQ and AF level for optimum resolution.
VHFRT2048isprovidedwithapush-buttonkeyboardofferinganattractivetactilefeelingandasafefinger-guidein
the metal front. Besides, the keyboard is fitted with night-illumination of the lettering from behind.
VHFRT2048hasahighefficientLEDread-outofchannelnumberandotherindicationsforoptimumreadingunder
all conditions.
VHF RT2048 is a modern transceiver with an all synthesized frequency generation based on a single crystal.
VHF RT2048 has a built-in 12W AF power amplifier, which delivers 6W into the large built-in loudspeaker.
VHFRT2048 isfor12V DCsupply.Voltage change-overfrom24V to12ViseasilydonebythepowersupplyN420.
VHF RT2048 has an extremely low standby current consumption, typically below 100 mA.
VHF RT2048 is housed in a corrosion resistant metal cabinet with a green nylon finish.
VHF RT2048 can be delivered with a built-in selcall decoder, which will decode a selective call CA or all ships call
CQ
9403
Page1-2

1INTRODUCTION RT2048
9403 Page1-3
1.2. TECHNICAL DATA
Fulfilsthe international CEPT regulations.
GENERAL
Allinternationalmaritime VHFchannels
Privatechannels: 10, may be extended to 40
Operation: Simplexandsemi-duplex
Modulation: G3EJN(Phase)
Antennaimpedance: 50ohm
Frequencystability: +/- 10 ppm (Spec. vers. +/- 5 ppm)
Temperaturerange: -20oCto+55oC
Nominalpowersupply: 13.2VDC
Powersupplyvariation: 12V DC -10% to +30%
(withdataaccordingtointernationalstandards)
Powerconsumption: Standby = 0.1 A
Transmit = 5 A
Dimensions: Height: 98 mm
Width: 225 mm
Depth: 160 mm
Weight: 3.1 kg
RECEIVER
Frequencyrangesimplex: 154.40-159.15MHz
Frequencysemi-duplex: 159.00-163.75MHz
Sensitivity: 0.25 uV PD at 12 dB SINAD
AFoutput power: 6 Watt/4 ohm
Telephoneoutput: 0.5VRMS/200ohm
Distortion: Less than 5%
Scanning facilities: Flexiblescanningprogramme,
with possibility for all international
channelsand10privatechannels.
Accessory: Selcalldecoderaccordingto
CCIR
TRANSMITTER
Frequencyrangenormal: 154.40-159.15MHz
Frequencyrangespecial: 159.00-163.75 MHz
RFoutputpower: 25 Watt +0 to -0.5 dB
ReducedRFoutput: 0.5 to 1 Watt
Distortion: Less than 5%

1INTRODUCTION RT2048
1.3. CONTROLS
SELCALL
OFF
VOL
SQ
1
4
2
5
8
DIM
7
P
0
SHIFT
16
1W
9
6
3
1W Tx
T / R
U.S.
DELETE
SCANSCAN
ADD
SCAN
SCAN
TIME D.W.
US
VOL
OFF
Indicationof ON/OFF/VOL turn-style knoboperation.
SQ Squelch sensitivity control knob with turn-style operation.
16 Quick selection of the call and distress channel 16.
SCAN
1Digits from 1 to 0
SHIFT
Activates the functions marked in orange on the keyboard.
Whenever the keyboard is in “shift-mode” it will be
indicated by “cornerbars” in the display
1W Tx US
SHIFT
SCAN
1Selectsscanningprogramme.
SHIFT
SCAN
2
ADD Adds a channel to the scanning table.
SHIFT
SCAN
3
DELETE Deletes a channel from the scanning table.
9403
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1INTRODUCTION RT2048
SHIFT
SCAN
5
TIME Selects the scan time from 1 to 99 seconds.
The time chosen is the listening time on one of the secondary channels receiving
a signal.
SHIFT
D.W. 6Selects the dual watch facility.
SHIFT
1W 9Selects1Wreducedpoweroutput.
SHIFT
U.S. 8Selects the VHF channels used in the USA.
SHIFT
DIM 7The intensity of the LED-indicators can be controlled in four steps.
The keyboard illumination is switched on and off.
SHIFT
SELCALL
4
T / R
Tests the selcall decoder and resets the selcall decoder after a call.
SHIFT
P0
Selects the standard private channels.
READ-OUT
Channel Read-Out All international maritime channels are shown by the two digits,
Reduced Power
In harbour areas or in the close
Where two stations are close
Transmitting
is depressed, and the transmitter
US-Channels
In the USA a number of the
Whenever the handset switch
output power level has reached
an appropriate level, the "TX"
will appear.
reduced from 25W to 1W
transmissions should be with
vicinity of another vessel,
When the display shows 1W,
reduced power.
the transmitter output power is
together, this reduction can
improve communication quality.
international duplex channels
are used as simplex channels.
Ships sailing in American waters
must therefore be able to select
these channels as simplex channels.
The appearance of "US" on the
display indicates that this mode of
operation is in use.
2
9655
Selection of a standard private channel will be indicated with a P-.
when the channel has been keyed in.
1W Tx US
9403 Page1-5

1INTRODUCTION RT2048
1.4. PRINCIPLE OF OPERATION
FREQUENCYGENERATION
All the internal frequencies are referenced to a crystal oscillator, running on 14.85 MHz.
The 14.85 MHz is divided by 4 in the REFERENCE DIVIDER, to generate a 3.7125 MHz signal, which is the input
tothePLL-referencedividerand clock-signal for the microcomputer.
Thelocal oscillator signal for the first mixerin the receiverand the transmit signal are generated ina phase-locked
loop(PLL). To generate the needed frequencies, which are specified asfollows:
139.1 MHZ < fLO1 < 148.45 MHz; 154.5 MHz < fTX NORMAL < 159.15 MHz
159.0 MHz < fTX SPECIAL << 163.75 MHz
a bandshift is performed in the VCO.
The loop reference frequency - and so the resolution - is 12.5 kHz, derived by dividing the reference divider output
with 297.
TheVCOoutputfrequencyisdivideddownto12.5kHzafterthedual-modulusprinciplewithaPRESCALERdividing
with32/33.
The phase detector output controls the CHARGE PUMPE feeding the loop filter integrator.
Ifthereisadifferenceinphase/frequencybetweentheinputstothephasedetector.Anerrorcurrentfromthecharge
pumpe will be integrated in the loop filter, producing the needed voltage for the VCO.
RECEIVER
The antenna signal is fed to the RX AMPLIFIER through the RX/TX relay.
ThebandpassfiltersaroundtheRXamplifieraretunedbymeansofcapacitordiodes,whicharecontrolledbyaDC-
voltage derived from the VCO control voltage in the PLL.
Thereceivedsignalisconvertedtothefirstintermediatefrequencyon15.3MHzintheFIRSTMIXER,usingtheVCO
signal from the RX BUFFER AMPLIFIER as local oscillator signal.
Thesignalisfilteredandamplifiedbeforedown-conversionto450kHzintheSECONDMIXER.Thecrystaloscillator
signal is used as local oscillator signal.
After filtering in the SECOND IF FILTER, the signal is amplified and detected.
The AF signal is passed through a mute switch before undergoing appropriate amplification and filtering to get the
rightfrequencyresponse.
Besides,thedetectedoutputisfilteredintheSQUELCHFILTERbeforeitisamplified,detected,andcomparedwith
a reference level to get a logical level for the microcomputer, which controls the mute circuit.
The telephone amplifier and the AF power amplifier produce the wanted output levels for the earpiece and the
loudspeaker.
TRANSMITTER
ThesignalfromthemicrophoneispassedthroughaPRE-EMPHASISnetworkbeforeappropriateamplificationand
compression in the AF AMPLIFIER COMPRESSOR.
This signal is filtered before it is fed to the VCO, where the modulation of the transmitter signal takes place.
As the VCO oscillates direct on the transmitting frequency in TX-mode, the signal only has to be amplified. This is
done in the TX BUFFER AMPLIFIER and the TX POWER AMPLIFIER.
The power supply for the TX power amplifier is regulated by a feed-back loop via the POWER SENSE circuit to
maintainconstantoutputpower level. Switching between full and reduced outputpowerlevelismade by means of
thePA-REGULATOR.
Toreducethelevelofharmoniccomponentsinthe outputsignalitispassedthroughaHARMONICFILTERbefore
it is led to the antenna via the RX-TX-RELAY.
MICROCOMPUTER
The microcomputer on the interface unit is taking care of various functions, among these the user interface, which
meansreading of the keyboard and readout to the LED-display via theDISPLAY-LATCHES.
Moreoverthecomputercalculatestheappropriatedivision figuresforthePLL,controlsthetransmitterpowerlevel,
the AF mute circuits, and reads and writes to the EEPROM’s.
When a selcall unit is installed, the microcomputer also controls the selcall switch capacitor filter.
The serial interface is only for factory production use.
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1 INTRODUCTION RT2048
Page 1-7
9403
BLOCK DIAGRAM

2. INSTALLATION
Before installation of a SAILOR VHF RT2048 the following points must be observed:
1. Which facilities have to be enabled?
Selcall, private channels, US-mode, dual watch, scanning facilities, etc. The procedure how to enable the
facilitiesisdescribedinthemanual:INSTRUCTIONSFORIDENTITYANDSERVICEPROGRAMMINGOF
SAILOR VHF RT2048.
This manual will only be delivered to dealers and general agents, where it must be at the disposal of trained
service people in the service workshop.
2. In what way the VHF RT2048 has to be installed?
In the section MOUNTING POSSIBILITIES, the installation of VHF RT2048 is described either as an
independent unit or in combination with the other elements of the Compact 2000 programme.
3. Handset.
Installation of handset, see the section HANDSET.
4. External loudspeaker.
An external loudspeaker 4-8 ohm/6W can be connected to the power connector J1, pin 1 and 6, see the
section POWER CONNECTOR + EXT. LOUDSPEAKER.
5. Special options:
Remote alarm for selcall, AF to information decoder, AUX I and AUX II information, etc. are available, see
the section SPECIAL OPTIONS
9346 Page 2-1
RT2048

2 INSTALLATION RT2048
2.1. MOUNTING POSSIBILITIES
TheVHFRT2048cabinetisdesignedinamodulecalledamini1/4box.Forthismodulewecansupplyawidevariety
of installation brackets etc. which will be described below. We have made a drawing including dimensions and
drilling plan for each type and we kindly ask you to look at the drawing for the type in question.
H2077 MULTI-PURPOSE MOUNTING BRACKET
This mounting bracket is as standard delivered together with RT2048. It permits a wide variety of installation
possibilities such as tabletop, bulkhead or deckhead. It is easy to remove the set by unscrewing the two buttons
of H2077.
H2077
25572 25571
Weight:
Mounting kit H2077: 0.4 kg
VHF RT2048: 3.2 kg
25668
9346
Page 2-2
182
52max. 65 *max. 60 **max. 96 252
139
25572
290
o

2 INSTALLATION RT2048
H2067MOUNTING BRACKETFORTABLETOP, BULKEHADOR DECKHEADMOUNTINGFOR MINI1/4 BOX
This mounting bracket is used when RT2048 is to be mounted next to other SAILOR units in the Compact 2000
programme mounted in H2055 mounting brackets. For example when installing the RT2048 next to the scrambler
CRY2001 it is possible to tilt both units in the same angle.
H2067
25574 25573
25575
Weight:
Mounting kit H2067: 0.5 kg
VHF RT2048: 3.2 kg
25659A
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2 INSTALLATION RT2048
9346
Page 2-4
H2057 ANGLE HINGES FOR TABLETOP, BULKHEAD OR DECKHEAD MOUNTING FOR MINI 1/4 BOX
H2057 is designed for stationary installation. It offers a lot of mounting possibilities using the different holes in the
angle hinges when tilting the VHF.
H2057
25534 25530
25531A 25531
25669
25533
* Dimensions when using a right-angled VHF plug.
** Dimensions when using a standard VHF plug.
Weight: Mounting kit H2057: 0.4 kg
VHF RT2048: 3.2 kg 25670

9346 Page 2-5
H2063 CONSOLE MOUNTING KIT FOR 1/4 BOX
This mounting kit is used for console flush mounting of 1/4 box and mini 1/4 box.
Free distance must be kept to allow free air circulation, ambient temperature max. 40o C.
H2063
25663
Weight:
Mounting kit H2063: 1.0 kg
VHF RT2048: 3.2 kg
24703
25657
2 INSTALLATION RT2048

2 INSTALLATION RT2048
2.2. HANDSET
ThehandsetcanbeplacedanywhereneartheVHFset.Thecableisfive-coredandconnectedtotherear
of the VHF through a 9-pole Sub-D connector.
Installation of the cable, see the drawings of the mounting brackets. The cable grommet must be placed
in the most convenient groove in the mounting bracket.
If more than one handset is needed, please see the section SPECIAL INSTALLATION WITH 2 OR 3
MICROTELEPHONES.
2.3. MICROTELEPHONE CONNECTOR
Pin No. 1 Telephone
Pin No. 2 GND
Pin No. 3 GND
Pin No. 4 Mic
Pin No. 5 Key
Pin No. 6 Spare
Pin No. 7 Distress CRY*
Pin No. 8 “Serial input”
25666 Pin No. 9 +13V internal
* only active when option board pcb is installed.
2.4. POWER SUPPLY
The standard power supply for RT2048 is 12V DC. For 24V DC supply an external power supply N420
(a 24V DC to 13.2V DC serial regulator) can be used.
For 110V AC, 127V AC, 220V AC, or 237V AC operation an external power supply N163S must be used
together with N420.
Page 2-6 9346
25664
25665

2 INSTALLATION RT2048
2.5. POWER CONNECTOR + EXT. LOUDSPEAKER
VIEW FROM MOUNTING SIDE
Pin No. 1 Ext. loudspeaker
Pin No. 2 Ext. mute*
Pin No. 3 +12V power supply
Pin No. 4 on/off for 24V supply
Pin No. 5 -12V power supply
Pin No. 6 Ext. loudspeaker
24914
* only active when option board pcb is installed.
Ifnecessarya4-8ohm/6WexternalloudspeakercanbeconnectedtopinNo.1andpinNo.6inthepowerconnector
J01 (observe that there is DC voltage on both wires).
External loudspeakers SAILOR H2054 and H2074 are available.
2.6. ANTENNAS
All common 50 ohm antennas, which cover the used frequency range with a reasonable standing wave ratio,
maximum 1.5, are available.
The antenna is connected to the set by means of a 50 ohm coaxial cable with low loss, e.g. RG213U. At the cable
end a PL259 plug is mounted.
The antenna must be placed as high and clear as possible. The horizontal distance to metal parts must be at least
one metre.
Thrane & Thrane has an antenna of the necessary specifications available. The mentioned antenna is character-
ized by small external dimensions. For further particulars see special brochure VHF AERIALS.
2.7. SPECIAL OPTIONS
With a small modification in RT2048 the following options are available:
1. K-switch function (used on river boats in Germany). Can be enabled by means
of the identity programming. US-button is changed to K-switch.
2. With DISTRESS OPTION installed
Part no. 625661
a. Distress output to CRY2001/2002.
3. With SELCALL OPTION installed
Part no. 625660
a. SELCALL RELAY, when the selcall has accepted a CQ or an individual call signal, the selcall
relay will turn on and short circuit two wires, which can be used for remote alarm.
Max. contact load: 100V AC/24V DC - 2A.
b. AF TO INFORMATION DECODER, the circuit giving AF signals to the information decoder
is turned on when the set has accepted a CQ or an individual call signal. The circuit is turned
on/off by the microprocessor.
0820 Page 2-7

2 INSTALLATION RT2048
4. With AUX INTERFACE OPTION installed
Part no. 625473
(AUX1, AUX2 and MUTE functions) (Distress and Selcall functions are also mounted).
a. AUX2, when information on certain channels is wanted, i.e. controlling a watch keeping
receiver, the AUX2 information can be used, a relay is controlled from the microprocessor.
Max. contact load: 100V AC/24V DC - 2A.
b. AUX1, when function code in Prom 1 is enabled, AUX1 is free programmable on all
international channels (“0” or “1”).
Standard programming on international channels is “0”.
Max. contact load: 100V AC/24V DC-2A.
c. MUTE, makes it possible to mute AF power amplifier from external equipment.
Activated by a make function between pin 5 and pin 8 in P1 on option board.
5. With BUS INTERRUPT OPTION installed
Part no. 626945
This module is used for interface to VHF DSC RM2042.
6. With ATIS OPTION installed
Part no. 728665
The module 628652 is used for interface to ATIS module 626707, which is mounted on this PCB.
ForcircuitdescriptionandprogrammingofATISoptionpleaserefertoAppendixA-ATISOPTION
25662A
COMPONENT LOCATION FOR SPECIAL OPTIONS MODULES
VALID FOR 625661 / 625660 / 625473
Seen from component side Seen from component side
with upper side tracks. with lower side tracks.
PCB rev. 25473
0820
Page 2-8