JRC JMA-5312-6/6HS User manual

INSTALLATIONINSTALLATION
MANUALMANUAL
MARINE RADARMARINE RADAR
EQUIPMENTEQUIPMENT
JMA-5312-6/6HSJMA-5312-6/6HS
JMA-5322-7/9/6HSJMA-5322-7/9/6HS
JMA-5332-12JMA-5332-12
01ETM ISO 9001, ISO 14001 Certified
Printed in Japan
Marine Service Department
[phone]
[phone]
[email protected]
Telephone :
Facsimile :
e-mail :
AMSTERDAM Branch
Telephone :
Facsimile :
e-mail :
[phone]
[phone]
[email protected]
SEATTLE Branch
Telephone :
Facsimile :
e-mail :
[phone]
[phone]
[email protected]
CODE No.7ZPRD0676CODE No.7ZPRD0676
JUL. 2013 Edition 7 JRCJUL. 2013 Edition 7 JRC
Not use the asbestos
For further information,contact:
URL http://www.jrc.co.jp

CONTENTS
1. OVERVIEW
2. INSTALLATION OF THE SCANNER
2.1 SELECTING THE INSTALLATION POSITION ........................................ 2-1
2.2 INSTALLATION PROCEDURE ................................................................ 2-7
2.3 CONNECTING THE INSTALLATION CABLE NKE-2103
(JMA-5312-6/6HS).................................................................................2-11
2.4 CONNECTING THE INSTALLATION CABLE NKE-2254
(JMA-5322-7/9/6HS)............................................................................. 2-13
2.5 CONNECTING THE INSTALLATION CABLE NKE-1130
(JMA-5332-12) ..................................................................................... 2-15
3. INSTALLATION OF THE DISPLAY UNIT
3.1 SELECTING THE INSTALLATION POSITION ........................................ 3-1
3.2 INSTALLATION OF THE LCD MONITOR................................................ 3-2
3.3 INSTALLATION OF THE OPERATION UNIT .......................................... 3-3
3.4 INSTALLATION OF THE POWER CABLE (CFQ-5436).......................... 3-4
3.5 INSTALLATION OF THE CABLE (CFQ-6912) BETWEEN
THE RADAR PROCESS UNIT AND THE SCANNER ........................... 3-6
3.6 CONNECTING TO THE GPS RECEIVER................................................ 3-8
3.7 CONNECTING TO THE GPS COMPASS .............................................. 3-10
3.7.1 JLR-10 ............................................................................................... 3-10
3.7.2 JLR-20/30 .......................................................................................... 3-12
3.7.3 OTHER MAGNETIC COMPASS........................................................ 3-13
3.8 CONNECTING TO NMEA HEADING OUTPUT DEVICE....................... 3-14
3.9 CONNECTING TO THE GYRO AND ELECTROMAGNETIC LOG
(GYRO I/F UNIT SETTING) (OPTON).................................................. 3-16
3.10 CONNECTING TO THE PC PLOTTER.................................................. 3-21
3.11 CONNECTING TO OTHER NMEA DEVICES ........................................ 3-21
3.12 CONNECTING TO OTHER DEVICES ................................................... 3-22
3.13 POWER SUPPLY (NBA-5111) (OPTION) .............................................. 3-24
3.14 TARGET TRACKING (NCA-877WA/877A) (OPTION)........................... 3-25
3.15 PLOTTER CIRCUIT (NDB-34A) (OPTION) ........................................... 3-27
3.16 CONNECTING TO AIS (NQA-2103) (OPTION) ..................................... 3-29
3.17 COASTLINE ROM CARD/MEMORY CARD (OPTION) ......................... 3-33
3.18 CONNECT SLAVE MONITOR / VDR..................................................... 3-36
3.19 INTERSWITCH UNIT (NQE-3141-4A/8A) (OPTION)............................. 3-39
7ZPRD0676

3.20 INSTALLATION OF THE POWER CONTROL UNIT (NQE-3167)
(OPTION) ..............................................................................................3-41
3.20.1 CONNECTION WITH NKE-2103 (JMA-5312-6/6HS) /
NKE-2254 (JMA-5322-7/9/6HS) SCANNER UNITS.........................3-41
3.20.2 CONNECTION WITH NKE-1130 (JMA-5332-12) SCANNER UNIT...3-41
3.20.3 CONNECTION TO DISPLAY UNIT ....................................................3-42
3.20.4 EQUIPMENT CABLE END PROCESSING........................................3-42
3.21 INSTALLATION OF THE LAN CABLE (OPTION)..................................3-43
3.21.1 CONNECTION TO NDC-1417 RADAR PROCESSOR UNIT.............3-44
3.21.2 NETWORK SETTING (NETWORK)...................................................3-45
3.21.3 TRANSMIT/RECEIVE DATA SETTING (LAN PORT SETTING)........3-47
3.21.4 EQUIPMENT CABLE END PROCESSING........................................3-50
4. INITIAL SETTING
4.1 HOW TO OPEN THE SERVICEMAN MENU ............................................4-1
4.2 TUNE ADJUSTMENT ...............................................................................4-2
4.3 BEARING ADJUSTMENT ........................................................................4-4
4.4 RANGE ADJUSTMENT............................................................................4-4
4.5 NAVIGATOR SETTING (DEVICE) ............................................................4-5
4.6 SETTING OF TRUE BEARING VALUE....................................................4-5
4.7 ANTENNA HEIGHT SETTING (ANTENNA HEIGHT)...............................4-6
4.8 SETTING OF CCRP/ANTENNA/GPS ANTENNA POSITION
(CCRP SETTING) ...................................................................................4-7
4.9 COMMUNICATION PORT SETTING (COM PORT SETTING).................4-9
4.10 SECTOR BLANK SETTING (SECTOR BLANK)....................................4-12
4.11 TNI BLANK SETTING (TNI BLANK)......................................................4-13
4.12 SETTING OF BEARING PULSES FROM ANTENNA
(OUTPUT PULSE) ................................................................................4-14
4.13 SLAVE MODE SETTING (MASTER/SLAVE) .........................................4-15
4.14 LANGUAGE SETTING (LANGUAGE) ...................................................4-16
4.15 DATE TIME SETTING.............................................................................4-16
4.16 MAIN BANG SUPPRESSION ADJUSTMENT (MBS) ............................4-17
4.17 ADJUSTMENT OF PERFORMANCE MONITOR (MON) .......................4-18
4.18 MAGNET COMPASS SETTING .............................................................4-19
4.19 GPS RECEIVER SETTING.....................................................................4-20
4.20 DGPS RECEIVER SETTING ..................................................................4-24
4.21 SBAS RECEIVER SETTING ..................................................................4-26
4.22 DISPLAYING GPS RECEPTION STATUS .............................................4-28

5. MEASURES AGAINST NOISE INTERFERENCE IN THE
RADIO EQUIPMENT
5.1 SHIELD OF DEVICES.............................................................................. 5-1
5.2 INTER-UNIT CABLES.............................................................................. 5-1
5.3 INSTALLATION LOCATION .................................................................... 5-1
5.4 GROUNDING ........................................................................................... 5-1
APPENDIX
FIG.1 OUTSIDE DRAWING OF NKE-2103-6/6HS SCANNER UNIT
(JMA-5312-6/6HS)
FIG.2 OUTSIDE DRAWING OF NKE-2254-7 SCANNER UNIT (JMA-5322-7)
FIG.3 OUTSIDE DRAWING OF NKE-2254-9 SCANNER UNIT (JMA-5322-9)
FIG.4 OUTSIDE DRAWING OF NKE-2254-6HS SCANNER UNIT (JMA-5322-6HS)
FIG.5 OUTSIDE DRAWING OF NKE-1130 SCANNER UNIT (JMA-5332-12)
FIG.6 OUTSIDE DRAWING OF NWZ-173 LCD MONITOR
FIG.7 OUTSIDE DRAWING OF NWZ-173 LCD MONITOR WITH MPBC42446
STAND (OPTION)
FIG.8 OUTSIDE DRAWING OF NDC-1417 RADAR PROCESS UNIT,
FIG.9 OUTSIDE DRAWING OF NCE-5171 OPERATION UNIT
FIG.10 OUTSIDE DRAWING OF NQE-3151A JUNCTION BOX (JMA-5332-12)
FIG.11 OUTSIDE DRAWING OF NQE-3141-4A INTERSWITCH UNIT (OPTION)
FIG.12 OUTSIDE DRAWING OF NQE-3141-8A INTERSWITCH UNIT (OPTION)
FIG.13 OUTSIDE DRAWING OF NBA-5111 RECTIFIER UNIT (JMA-5312-6/6HS,
JMA-5322-7/9/6HS : OPTION, JMA-5332-12 : STANDARD)
FIG.14 OUTSIDE DRAWING OF NQE-3167 POWER CONTROL UNIT (OPTION)
FIG.15 GENERAL SYSTEM DIAGRAM OF JMA-5312-6/6HS RADAR
FIG.16 GENERAL SYSTEM DIAGRAM OF JMA-5322-7/9/6HS RADAR
FIG.17 GENERAL SYSTEM DIAGRAM OF JMA-5332-12 RADAR
FIG.18 GENERAL SYSTEM DIAGRAM OF JMA-5312-6/6HS RADAR AND
NQE-3167 POWER CONTROL UNIT (OPTION)
FIG.19 GENERAL SYSTEM DIAGRAM OF JMA-5322-7/9/6HS RADAR AND
NQE-3167 POWER CONTROL UNIT (OPTION)
FIG.20 GENERAL SYSTEM DIAGRAM OF JMA-5332-12 RADAR AND NQE-3167
POWER CONTROL UNIT (OPTION)
FIG.21 POWER SYSTEM DIAGRAM OF JMA-5312-6/6HS, JMA-5322-7/9/6HS
RADAR
FIG.22 POWER SYSTEM DIAGRAM OF JMA-5332-12 RADAR
FIG.23 INTERNAL CONNECTION DIAGRAM OF NDC-1417 RADAR PROCESS
UNIT

FIG.24 INTERNAL CONNECTION DIAGRAM OF NQA-2123 INTERFACE UNIT
FIG.25 INTERNAL CONNECTION DIAGRAM OF NCE-5171 OPERATION UNIT
FIG.26 INTERNAL CONNECTION DIAGRAM OF NWZ-173 LCD MONITOR
FIG.27 INTERNAL CONNECTION DIAGRAM OF NQE-3151A JUNCTION BOX
FIG.28 INTERNAL CONNECTION DIAGRAM OF NKE-2103 SCANNER UNIT
(JMA-5312-6/6HS)
FIG.29 INTERNAL CONNECTION DIAGRAM OF NKE-2254 SCANNER UNIT
(JMA-5322-7/9/6HS)
FIG.30 INTERNAL CONNECTION DIAGRAM OF NKE-1130 SCANNER UNIT
(100-115V) (JMA-5332-12)
FIG.31 INTERNAL CONNECTION DIAGRAM OF NKE-1130 SCANNER UNIT
(220-240V) (JMA-5332-12)
FIG.32 INTERNAL CONNECTION DIAGRAM OF NQE-3141 INTERSWITCH UNIT
(OPTION)
FIG.33 INTERCONNECTION DIAGRAMS OF JMA-5312-6/6HS RADAR
FIG.34 INTERCONNECTION DIAGRAM OF JMA-5322-7/9/6HS RADAR
FIG.35 INTERCONNECTION DIAGRAM OF JMA5332-12 RADAR
FIG.36 INTERCONNECTION DIAGRAMS OF JMA-5312-6/6HS RADAR AND
NQE-3167 POWER CONTROL UNIT (OPTION)
FIG.37 INTERCONNECTION DIAGRAM OF JMA-5322-7/9/6HS RADAR AND
NQE-3167 POWER CONTROL UNIT (OPTION)
FIG.38 INTERCONNECTION DIAGRAM OF JMA5332-12 RADAR AND NQE-3167
POWER CONTROL UNIT (OPTION)
FIG.39INTERCONNECTION DIAGRAM OF NQE-3141 INTERSWITCH UNIT
(OPTION)
FIG.40 INTERCONNECTION DIAGRAM OF SIMPLE INTERSWITCH (OPTION)

APPENDIX
1
1 OVERVIEW
2
2 INSTALLATION OF THE SCANNER
3
3 INSTALLATION OF THE DISPLAY UNIT
4
4 INITIAL SETTING
55 MEASURES AGAINST NOISE INTERFERENCE IN
THE RADIO EQUIPMENT
APPENDIX

SECTION 1
OVERVIEW

The proper installation of the radar equipment is critical in ensuing its effective and reliable performance as
well as facilitating maintenance and repair. Therefore, carefully install the radar equipment by following the
procedures below:
1) Install the scanner as high as possible while taking the scanner's weight into consideration.
2) It is preferable to install the display unit in the wheel house to facilitate observations.
3) The standard cable length for installing the radar JMA-5300MK2 is as shown in the table below. If
there is a need for using a cable longer than the standard length, notify JRC of it beforehand. A
cable longer than the standard length may hider performance of the radar, so give it careful
consideration when planning the installation. (The standard cable length is considered to be
sufficient for small and middle size ships for which this radar is designed.)
Standard cable length (number of cores)
JMA-5312-6/6HS 20 m (19 cores)
JMA-5322-7/9/6HS 20 m (19 cores)
JMA-5332-12 10 m (19 cores)(between the Display Unit and the Junction Unit)
20 m (14 cores)(between the Junction Unit and the Scanner Unit)
1-1

SECTION 2
INSTALLATION OF THE SCANNER
2.1 SELECTING THE INSTALLATION POSITION ........................................2-1
2.2 INSTALLATION PROCEDURE ................................................................2-7
2.3 CONNECTING THE INSTALLATION CABLE NKE-2103
(JMA-5312-6/6HS) ................................................................................2-11
2.4 CONNECTING THE INSTALLATION CABLE NKE-2254
(JMA-5322-7/9/6HS) .............................................................................2-13
2.5 CONNECTING THE INSTALLATION CABLE NKE-1130
(JMA-5332-12) ......................................................................................2-15

2-1
2.1 SELECTING THE INSTALLATION
POSITION
1) Physical selection criteria
•Install the antenna at the center of the mast on the keel line.
•If the antenna cannot be installed at the above position for some reason, the amount of
deviation must be minimized. And, reinforce the mount base and the platform and take
precautions to protect the antenna from vibration and impact at the installation position.
•To avoid the radiating section coming in contact with other installed objects while it is
rotating, ensure that there is at least 200 millimeters from the swing circle (turning radius) to
other installed objects (Fig.1). The swing circle of the JMA-5300MK2 radar's antenna is as
shown in Table 1.
Fig.1 Installation of antenna
Table 1 Swing circle
RADAR model Antenna model (length) Swing circle
JMA-5312-6/6HS NKE-2103-6/6HS (6 feet) 1910mm
JMA-5322-6HS NKE-2254-6HS (6 feet)
JMA-5322-7 NKE-2254-7 (7 feet) 2270mm
JMA-5322-9 NKE-2254-9 (9 feet) 2825mm
JMA-5332-12 NKE-1130 (12 feet) 4000mm
min-height
必要最小高さ
min-offset
オフセット最小
Over 200mm
200mm 以上
reinforcing member
補強材

2-2
2
•Avoid having a rope or signal flag from winding around the radiating section thereby
preventing it from rotating.
•Avoid the effects of dust and heat caused by smoke from a chimney.
•When determining the appropriate antenna height and installation location, take into
consideration the reduction of vibration, the strength of the hull and the antenna mount base,
and maintenance properties.
•Provide for maintenance space: platform, safety link, hand rail, steps, etc. The lower edge
of a radar antenna should be a minimum of 500 mm above any safety rail.
•When installing the scanner, select a location where there are the fewest structural objects in
the surrounding area so that the capability to drive the motor will not be depressed by the
non-equability wind which is likely to rotate the scanner.
2) Electrical selection criteria
•The installation height of the antenna relates to the maximum detection distance. The
higher, the better. However, if it is too high, radio wave energy greatly attenuates above the
antenna's vertical beam width (the point -3dB from the peak of the main lobe). As a result,
it is difficult to detect a close-in target. Sea clutter also increases. Determine the
installation height by taking into consideration the weight, maximum length of the cable, and
maintenance after installation.
•If the installation height of the antenna is low, it is difficult to detect a long distance target.
The ship's mast, derrick, and chimney interfere with radiating beam causing the range that
cannot be viewed on the radar display to increase.
Generally, the lowest antenna installation position is supposed to be on the A-B line shown in
Fig.2.
In the case of the JMA-5312/5322 type radar, 2θequals 20°.
In the case of the JMA-5332 type radar, 2θequals 25°. Specifically, the antenna position is
normally elevated so that the chimney and the shrine-gate type mast do not interfere with
radiating beam.
The A-B line, or L line of sight from the radar antenna to the bow of the ship should hit the
surface of the sea in not more than 500 m or twice the ship length, depending which value is
smaller, for all load and trim conditions.
JMA-5312-6/6HS/JMA-5322-7/9/6HS: θ= 10°
JMA-5332-12: θ= 12.5°
L
A
B
Fig.2 Lowest antenna installation height

2-3
•If it is considered that sufficient installation height cannot be provided when the antenna is
installed directly on the roof of the wheelhouse, use a mounting rack or radar mast (FIG.3).
Normally, when the antenna installation height is less than 2 meters from the roof of the
wheelhouse, provide a mounting rack assembled at an angle frame to install the antenna.
When the antenna installation height is 2 meters or higher from the roof of the wheelhouse,
provide a cylindrical radar mast to install the antenna. Consider the convenience of the
service staff who take care of installation, maintenance, adjustment, and repair of the
antenna by providing adequate footholds to the mounting rack and the radar mast.
Fig.3 Mounting rack and mast for the antenna
•When installing the antenna, select a location where there are the fewest structural objects in
the surrounding area so that false images which interfere with target detection will not be
generated by signal reflection from other antennas, deck structures, and cargo. Only as a
guide, note that structural objects should not exist within the range of the vertical beam
width (Fig.4).
Vertical beam width of X-band: Approx. 20°(±10.0°when the height of the radiating
section is 0°)
Vertical beam width of S-band: Approx. 25°(±12.5°when the height of the radiating
section is 0°)
Fig.4 Antenna and the surrounding structural objects
ビーム幅
Beam width
Installation Installation

2-4
2
•When installing two or more scanners, scanners in close proximity should have a minimum
vertical elevation separation angle of 20 and a minimum vertical separation of 1m where
possible, so that those scanners do not enter each other's vertical beam width range.
1m (min)
20°(min)
Fig.5 Installing two or more scanners
•To avoid interference with other equipment and to prevent radio noise from generating, do
not place the VHF antenna, GPS antenna, and INMARSAT's dome within the range of the
vertical beam width.
•Keep a record of installation height data. The data is necessary for the initial setting of the
display unit.
•Minimize the blind sector, and ensure the adequate view angle so that the blind sector does
not exist in the range 22.5°from side to rear (Fig.6). Specifically, ensure a sufficient view
field in the straight front (relative bearing 000°).
•Individual blind sectors of more than 5º, or a total arc of blind sectors of more than 20º,
should not occur in the remaining arc, excluding the arc in the above condition (Fig.6).
Heading
0° direction
90°270°
22.5°
Make no blind sector.
Individual blind sectors of more than 5º, or
a total arc of blind sectors of more than 20º,
should not occur in the remaining arc.
22.5°
Fig.6 Ensuring view angle

2-5
•For radar installations with two radar systems, where possible, the antennas should be placed
in such a way as to minimize the blind sectors.
•Magnetron which has strong magnetic force is included in the antenna. Install the antenna
at least 6 meters away from nautical instruments including magnetic compasses and
chronometers.
* If there is a concern that structural objects existing within the vertical beam width may
generate false images, equip the structural objects with a radio wave absorber. (There are
two types of absorbers: broadband type having no specific resonant frequency and
narrowband type which can absorb a band with a specific frequency. Use those where
applicable.) Furthermore, it is effective to install a metal reflector, which reflects radio
waves upwardly, between the antenna and a structural object so that the radar's radio wave
will not directly come in contact with the structural object.
When the structural objects exist in the surrounding area of Scanner unit, the false echo may
appear. The sector blank function is effective to reduce the signal reflection from the
structural objects. Because it can stop transmission. Therefore, it may reduce the false
echo appearance.
Note: Because most radio wave absorbers have poor durability, some must be
replaced every year. When installing a reflector, the area to the rear of the
reflector becomes a blind sector. Therefore, minimize the size of the reflector.
When the sector blank function set to on, ensure a sufficient view field in the
straight front.
* The above procedures for selecting an antenna installation position are described based on
the radar's antenna. Comprehensively select the antenna position by considering other
antennas' installation procedure manual, hull's structure, strength of the selected position,
and vibration. About compass safe distance, refer to the instruction manual section 11.
3) Confirmation during test run
If the antenna vibrates a lot during test run, try to reduce or prevent vibration by reinforcing
the antenna mount base or using wire stays attached to the radar mast.
4) Others
•The design of the mounting platform for the scanner should take into account the vibration
requirements of resolution A.694(17) and furthermore defined by IEC 60945.
Vibration
Frequency 2 to 13.2Hz
13.2 to 100Hz
Amplitude +/-1mm +/-10%
Acceleration 7m/s2constant
•All installations should facilitate protection of equipment, including cabling, from damage.
The cables should be kept as short as possible to minimize attenuation of the signal.
•Crossing of cables should be done at right angles(90°) to minimize magnetic field coupling.

2-6
2
•Eliminating the interference on frequencies used for marine communications and navigation
due to operation of the radar. All cables of the radar are to be run away from the cables of
radio equipment. (ex. Radiotelephone. Communications receiver and direction finder,
etc.) Especially inter-wiring cables between scanner unit and display unit of the radar should
not be run parallel with the cables of radio equipment.
•Cable should not be exposed sharp bends.
•The grounding of equipment units should be carried out according to INSTALLATION OF
SCANNER UNIT.
5) After installation
After you have completed the installation work, make a installation report with your
signature and explain it to the customer, then request him to keep the report on board a ship.
The installation report is now available for download on the our Marine Service Department
website (https://www2.msd.jp).

2-7
2.2 INSTALLATION PROCEDURE
1) Precautions for transporting and storing the antenna
•An scanner is a heavy load. Be very careful about handling it.
•Do not allow the scanner fall on its side while it is stored or being installed.
•Do not apply rope to the scanner in the way that squeezes or deforms the radiating section.
•When hoisting the scanner by a crane, do not hoist it by attaching a belt or a rope only to the
scanner's radiating section as shown in Fig.7.
•When lifting the S-band scanner（Fig.8）:
When lifting the scanner with the radiator by a crane, attach a rope (or belt/wire) to four
hoisting eyebolts attached to the scanner's chassis, and then lift the scanner so that a
protector attached on the radiator will be located between the rope and radiator.
Use suitable rope in length so that the distance from the crane's hook to the hoisting
eyebolts will be 2.5m or more.
Use the protector attached on the radiator in factory, an additional protector should be not
used. Because excessive protector will cause damage to the radiator's radome. After
installation of the scanner, remove the protector from the radiator.
If the lifting rope is attached to the scanner's support section located at the bottom of the
radiator, a load is imposed to the joint between the radiator and the chassis, then this will
cause damage.
On lifting the scanner, if the lifting rope (or belt/wire) is short, or a protector is not used, it
will scratch the radiator's radome.
And then, if a thick protector on the radome is used, it causes damage to the radome.
•When lifting the X-band scanner（Fig.9）:
Wrap a cloth around the scanner's support section located at the bottom of the radiator, and
then attach a belt to it to lift the scanner.
Fig.7 Improper way to hoist
Fig.8 S-band
Top view
Front view
Protector should be located between the rope and the radiator
（Protector is attached on the radiator in factory）
2．5ｍor more
側面図
Hook
Scanner's support section
（Do not use here for hoisting）Attach a rope to
four hoisting eyebolts

2-8
2
Fig.9 X-band
2) Installation procedures
a) Maintain a flat level surface on which to install the antenna.
•Use sufficiently thick steel material and reinforcement material for the antenna's
installation surface (mount base) to reduce vibration and impact. Keep the mount base
flat and smooth.
•If there is a partial gap between the mount base and the antenna chassis's legs, work on
the installation surface so that it becomes flat and smooth. If a gap exists and the
antenna is tightly clamped, the chassis will distort and become damaged by vibration.
b) Avoid using vibration-proof rubber and resin
•Do not insert an elastic body, such as vibration-proof rubber or resin, between the mount
base and the antenna chassis' legs. If rubber or resin is inserted, the amplitude of
vibration increases, resulting in the possibility of damage to the antenna. Furthermore,
if installation bolts become loose due to deterioration of rubber or resin, the antenna
may be damaged or fall from its mount.
3) Installation and clamping method
a) Installation direction
•Installation should be done so that the cable gland is oriented toward the stern.
b) Bolts, nuts and tightening torque to be used
•Use stainless steel bolts for the antenna and uniformly tighten all of the bolts using
double nuts for each bolt so that the antenna will not become loose (Table 2).
•Although the length of the bolt will differ according to the thickness of the mount base,
use a bolt long enough so that more than 4 millimeters of thread protrudes beyond the
double nuts after the double nuts have been tightened.
Table 2 Length of antenna mounting bolts and tightening torque
RADAR model Scanner Unit
Thickness of
Mount Base
(mm)
Bolt Torque (N-m)
JMA-5312-6/6HS NKE-2103-6/6HS 12 M10×55(mm)
SUS304 40
JMA-5322-7/9/6HS NKE-2254-7/9/6HS
JMA-5332-12 NKE-1130 19
M12×65(mm)
SUS304 65
Wrap a cloth

2-9
c) Use of washer and corrosion-resistant measures
•At the location where a bolt's head or nut comes in contact with the antenna chassis' legs
and the mount base, insert a plain washer which fits the bolt; and, at the location where
the nut comes in contact with the plain washer, insert a spring washer, and then securely
tighten the nuts (Fig.10).
•To prevent corrosion due to the contacts between different metals, such as the antenna
chassis' legs, installation surface, bolts, nuts, etc., cover the bolt's head and nuts with
sealant (Fig.10).
Fig.10 Use of washer and corrosion-resistant measures