Raytheon Pathfinder 1200 User manual

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Any reference to Raytheon or
RTN in this manual should be
interpreted as Raymarine.
The names Raytheon and RTN
are owned by the
Raytheon Company.

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~AYTHEO~
Mariners Pathfinder ®Radar
Model
1200
Instruction Manual

RA. \)- \0'"2.
PURPOSE
THIS MANUAL CONTAINS IMPORTANT INFORMATION OF THE INSTALLATION
OPERATION AND MAINTENANCE OF YOUR EQUIPMENT
RAYTHEON MARINE
COMPANY products are supported by a network of Authorized Service
Representatiy.e to you location you may contact the following regional centers:
Western United States Raytheon Marine Company
20410 Gramercy Place
Torrance, CA 90501
Phone: [phone]
(In CA: 800-842-3333)
Eastern United States Raytheon Marine Company
676 Island Pond Road
Manchester, NH 03103
Phone: [phone]
Europe Rayscan Copenhagen
Siljangade 6 DK2300
Copenhagen S Denmark
Phone: [phone]
Far East Raytheon Marine Sales &Service Co.
Minato-Ise Building 3-12-1
Kaigandori Naka-ku
Yokohama, Japan 231
Phone: [phone]

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HIGH VOLTAGE WARNING
Do not open any of the units when the radar is ON; high voltages within the Scanner and
Display
Unit could be fatal to anyone coming in direct contact with them.
Disconnect ship's
power from the Scanner and Display Unit before attempting env mainte-
nance; otherwise, ship's
power will be present at terminals inside the Scanner and Display Unit.
RADIATION HAZARD
Care should be taken to avoidpossible harmful effects (particularly to the eyes) of radiation
from radar transmissions.
To avoid
harmful radiation, the Display OPERA TE switch should be turned to the STBY
or OFF position when working on the Scanner. Under no circumstances should you look directly
into the antenna from a distance of less than 2feet when the radar is in operation.

CONTENTS
SECTION 1. GENERAL DESCRiPTION 1-1
1.1 INTRODUCTION 1-1
1.2 PHYSICAL DESCRiPTION 1-2
1.3 SPECIFICATIONS , " 1-4
SECTION 2. OPERATION 2-1
2.1 OPERATING CONTROLS 2-1
2.2 RANGE AND BEARING MEASUREMENTS 2-4
2.3 USING THE CONTROLS 2-5
2.4 NAVIGATION WITH THE. RADAR 2-6
2.5 FALSE ECHOES 2-9
SECTION 3. MAINTENANCE 3-1
3.1 GENERAL 3-1
3.2 SCANNER UNIT 3-1
3.3 DISPLAY UNIT 3-1
SECTION 4. INSTALLATION 4-1
4.1 PLANNING 4-1
4.2 INSTALLATION OF SCANNER UNIT 4-2
4.3 INSTALLATION OF DISPLAY UNIT 4-4
4.4 CHANGE ARRANGEMENT FOR SHIP'S MAINS INPUT 4-5
4.5 CABLE INFORMATION 4-6
4.6 INITIAL OPERATION AND CHECKOUT 4-8
SECTION 5. ADJUSTMENT AND FAULT FINDING 5-1
5.1 ADJUSTMENT 5-1
5.2 TROUBLE·SHOOTING ........................•........ 5-6
5.3 REPLACEMENT OF MAJOR COMPONENTS 5-14
SECTION 6. TECHNICAL DESCRIPTION 6-2
6.1 BLOCK DIAGRAM DESCRiPTION 6-2
6.2 SCANNER UNIT 6-9
6.3 DISPLAY UNIT 6-15
SECTION 7. PARTS LIST 7- 1

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DRAWINGS
Figure Title
101 GENERAL SYSTEM OF 1200 RADAR
102 OUTLINE DRAWING OF M89362 SCANNER UNIT
103 OUTLINE DRAWING OF M89361 DISPLAY UNIT
' ..
104 BLOCK DIAGRAM OF 1200 RADAR
105 INTERCONNECTIONS
OF 1200 RADAR
106 POWER SUPPLY DIAGRAM OF 1200 RADAR
107 CIRCUIT DRAWING OF M89362 SCANNER UNIT
108 INTERNAL CONNECTION OF M89361 DISPLAY UNIT
109 CIRCUIT DRAWING OF MAIN CONTROL PCB BUILT-IN
DISPLAY UNIT
110 CIRCUIT DRAWING OF CONTROL PANEL PCB BUILT-IN
DISPLAY UNIT
III CIRCUIT DRAWING OF DISPLAY ASSEMBLY BUILT-IN
DISPLAY UNIT
112 CIRCUIT DRAWING OF POWER SUPPLY PCB BUILT-IN
DISPLAY UNIT
113 ASSEMBLY DRAWING OF M89362 SCANNER UNIT
114 ASSEMBLY DRAWING OF M89361 DISPLAY UNIT

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SECTION 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
Congratulations on selecting the Raytheon Model 1200 Mariners Pathfinder Radar for
your radar navigation needs.
Whether you purchased this radar because
of its compactness or power economy,
ease
of installation, or long term reliability, one thing is certain; the moment you turn on
your 1200 you'll know you're seeing a revolutionary new concept in radar technology
at work.
Radar signals are "stored" on a 9-inch diagonal TV-type picture with chart like
clarity and detail. A single glance at your Model 1200 Display will giveyou a complete and
accurate 3600radar picture
of other vessels, bouys and land fall surrounding your vessel.
Aunique feature even allows you to "freeze" the picture for high accuracy bearing
and range measurements.
With
"one touch" range selection, recessable controls, and "Interference Rejection",
(a feature found only on bigger-radar systems) it should become apparent that human
engineering and operational simplicity have been considered foremost in the 1200's design.
We trust that you will enjoy many years
of excellent performance, reliability, and
smooth sailing with your new 1200 Radar.
1-1

1.2 PHYSICAL DESCRIPTION
1.2.1 Scanner Unit
The antenna and transceiver are combined within the 24Yz inch radome which is
made
of AES plastic and has a single-flange mounting. A small, flexible cable connects
the Scanner Unit to the Display Unit. The radome cover is secured to the scanner pan base
by four clamping bolts and provided with a rubber gasket to seal the unit from the weather
and salt spray.
1.2.2 Display Unit
The Display Unit is enclosed in a drip-proof case and can be easily mounted on top ?f
achart table, installed against a bulkhead, or hung from the overhead. All controls for
operating the 1200 Radar are located on
the front panel and positioned to easy adjustment
during day or night use. A bearing scale is illuminated around
the screen, and is used to
determined
the relative bearing to a target.
The compact transistor inverter, housed within the Display Unit, converts the ship's
mains supply (12, 24, or 32 Vdc) to the power supply voltages required by the radar system.
SCANNER UNIT
1·2

DISPLA Y UNIT
1-3

Number of rings
2
2
4
4
4
4
4
1.3 SPECI FICATIONS
1.3.1 General
I) Maximum range:
2) Minimurn range:
3) Range Scales:
4) Range discrimination:
5) Range ring accuracy:
6) Bearing accuracy:
7) Cathode-ray tube:
8) Environmental conditions:
Scanner Unit:
Display Unit:
9) Power Consumption:
DC 12V:
DC 24V:
DC 32V:
10) Ship's mains voltage variation
DC 12V:
DC 24V:
DC 32V:
12 nautical miles.
Better than 32 m on 0.25 n.m.
Range Range ring interval
0.25 nm 0.125 nm
0.5 nm 0.25 nm
I nm 0.25 nm
2 nm 0.5 nm
4nm Inm
8nm 2nm
12nm 3nm
Better than 22 m.
Better than ±2.5 %
of maximum range of the scale in
use, or 22 m, whichever is the greater.
Better
than ±I degree.
9 in. tube.
Effective diameter 130 mm
Temperature
-15°C to +50°C
(under nominal
input voltage)
Humidity Up to 95 %at 35°C
Wind velocity Up to 50 mls as relative
Temperature
-lOoC to +50°C
Humidity Up to 95 %at 35°C
4.5A
2.3A
1.8A
IIV-16V
22V - 32V
28V - 42V
1.3.2 Scanner Unit
I) Dimensions: Diameter
of radome
620mm
Height 345 mm
2) Weight Approx. 9.5 kg
3) Polarization: Horizontal
4) Beam width: Horizontal 5°
Vertical 25°
5) Sidelobes: Better than
-21 dB
6) Rotation: Approx. 27 RPM
7) Drive
motor input voltage: DC 12V
8) Transmitter frequency: 9445 ±30 MHz
1-4
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17) IF amplifier:
18) Overall noise figure:
9)
10)
11)
12)
13)
14)
15)
16)
Peak power
output:
Transmitter tube:
Pulse length/Pulse
repetition frequency:
Modulator:
Dup1exer:
X'ta1 protector:
-,
Local oscillator:
Mixer:
3 kw
Magnetron (M1315)
0.l2lls/920 Hz (0.25, 0.5, 1, 2 nm)
0.5 Ils/920 Hz (4, 8, 12 nm)
Solidstate modulator driving magnetron
Circulator
Diode Limiter
Gunn Oscillator
Balanced mixer (with IN23E and 1N23ER
crystal diodes)
Center frequency 38 MHz
Bandwidth 6 MHz
Better than 10 dB
1.3.3 DISPLAY UNIT
1) Dimensions:
2) Mounting:
3) Weight:
4) Cathode-ray tube:
5) Range scales:
6) Range rings:
7) Bearing synchronizing system:
8) Tuning:
9) Bearing scale:
10) Ship's heading marker:
11) Controls:
1.3.4 Inter-Unit Cable Length
Width 310 mm
Depth
380 mm
Height 263 mm
Table, overhead or bulkhead mounting
Approx. 7.5 kg
C935 P31 (Green)
0.25,0.5,1,2,4,8,12 nautical miles
0.125,0.25,0.25,0.5, 1,2,3 nautical miles
Motor Encoder
Manual
3600scale graduated at intervals
of 10
Electrical
OPERATE (OFF-STBY-ON)
TUNE
SEA-CLUTTER
GAIN
HOLD (SW)
RAIN CLUTTER (SW)
SHM, MARKERS (SW)
IR (SW)
BRIL (SW)
RANGE (0.25, 0.5, 1, 2, 4, 8, 12)
Type of Cable Standard Length Maximum Length
Scanner-Display H-2695 I10006 10 m
20m
1-5

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SECTION 2
OPERATION
2.1 OPERATING CONTROLS
Generally the operation of the 1200 is easy and straight forward. However, the
navigator who knows the layout and understands the functions
of the various controls will
obtain
the best performance from his equipment. .
2.1.1 Layout of the Controls
Layout of the controls is shown in Figure 2-1.
READY LIGHT
OPERATE SW
(OFF-STBY-ONI
TUNE control SEA
CLUTTER control
RAIN CLUTTER SW
SHM/MARKERS SW
INTERFERENCE
REJECTER SW
CRT BRILLIANCE SW
RANGE SW
HOLD SW
FIG. 2-1 OPERATlNG CONTROLS
2.1.2 Function of the Controls
1) OPERATE (OFF-STBY-ON)
In OFF position there is no power supplied to the Scanner Unit and Display Unit.
In STBY position, power is supplied to the Scanner Unit and Display Unit, but radio
wavesare not being transmitted.
Approximately 90 seconds after switching to STBY, the READY light will glow, mean-
ing the radar is available for operation.
2-1

2-2
In ON position, (with the READY light glowing) the system is transmitting, and
any echoes from targets received are amplified and displayed on
your screen.
2) RANGE
The seven RANGE switches select the scale which you wish the radar to display.
The range selected automatically determines
the proper number and calibrated
distance between the range rings and the proper transmission pulse length as shown
in Table 2-1.
TABLE 2-1 RELATION OF RANGE, RINGS AND PULSE LENGTH
Range Range Rings Interval Number of Rings Pulse Length
(nm) (nml
(~s)
0.25 0.125 20.12
0.5 0.25 2 0.12
I I 0.25 4 0.12
20.5 4 0.12
4I40.5
82 4 0.5
12 340.5
3) TUNE
The TUNE control allows you to maximize target echoes by "fine" tuning of the
local oscillator which is located in
the Scanner Unit.
4) GAIN
The GAIN control varies the amplification in the receiver, and thus the strength of
echoes as they will appear on the screen.
5) SEA CLUTTER
The SEA CLUTTER control reduces the gain level at short range only.
6) RAIN CLUTTER
The primary use of RAIN CLUTTER is to break up the returns from rain or snow
thus allowing weaker targets to become visible.
7) SHM MARKERS (SHM, MARKERS - SHM - MARKERS - OFF)
The SHM MARKERS switch is a four position switch which selects the SHM, markers,
both or none for the display.
8) CRT BRIL
The CRT BRI LLiANCE controls 4 levels of the screen brightness.
9) IR
The IR switch turns the interference rejecter "on" to eliminate interference from
other ship radars.
10) HOLD
The HOLD switch is used to temporarily "freeze" the picture on the screen to assist
the operator in determining bearing and ranges. Pushing the HOLD switch stops the
transmission
of RF power releasing the switch restores normal operation.
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2.1.3 Operating Procedure
TO SWITCH ON
To switch on the radar, proceed as follows:
1) Set the OPERATE switch to STBY.
2) After READY light glows (approximately 90 seconds), set the OPERATE switch to
ON.
3) Set the CRT BRI LLiANCE switch so as to obtain desired brightness
of the screen.
4) Set''range scale to the 4, 8 or 12 mile range.
5) Assure
that RAIN CLUTTER, the IR switch, and SEA CLUTTER are OFF.
6) Adjust
GAIN control to produce a light background speckle screen.
7) Adjust
TUNING control for maximum echoes on the screen. If there is no target
available (that is, in the open sea) adjust
TUNING for the maximum strength of
sea clutter.
8) Push RANGE switch
of the scale you wish to cover.
9) RAIN CLUTTER if necessary, STC as necessary.
10)
If necessary, press IR to reduce radar interference. When the radar is no longer re-
quired, set the OPERATE switch to OFF. If you want to keep the radar in a state
of
immediate readiness, the OPERATE switch should be set to STBY position.
2-3

2.2 RANGE AND BEARING MEASUREMENTS (See Figure 2-2)
The picture on the screen shows a plan view of the position of targets around your
vessel. In effect
your ship is at the center of the screen and targets are presented in polar
coordinates (or map-like) throughout 360 degrees. The display is referred to as the PPI
(Plan Position Indicator).
2.2.1 Range Measurement
To measure a target's range proceed as follows:
I) Note the range scale in use and the distance between rings.
2) Count the number
of rings between the center of the screen and the target, and visually
estimate the distance between the inner edge
of the target and inner edge of the nearest
ring.
2.2.2 Bearing Measurement
Using bearing scale engraved on the screen filter, read the bearing where the radial line
passes through the center
of the target. The reading you obtain will show the targets re-
lative bearing in degrees.
2-4
SHIP's HEADING MARKER
28
27~H----+-----l---+---o---*--+----t---+~
RANGE RINGS
26
FIG. 2-2 RANGE AND BEARING MEASUREMENTS
o
TARGET
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