Furuno FM-8800D User manual

Installation Manual
VHF RADIOTELEPHONE
FM-8800D/8800S
System Configuration .......................................................................................................................... ii
Equipment Lists ................................................................................................................................ iii
1. Mounting .....................................................................................................................................1-1
2. Connections................................................................................................................................2-1
3. Assembling console kit ...............................................................................................................3-1
PACKING LISTS.............................................................................................................................. A-1
Outline Drawings ............................................................................................................................. D-1
Interconnection DiagramS ............................................................................................................... S-1
www.furuno.co.jp

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・FURUNOAuthorizedDistributor/Dealer
9‑52Ashihara‑cho,
Nishinomiya,662‑8580,JAPAN
Telephone: +81‑(0)798‑65‑2111
Fax:
+81‑(0)798‑65‑4200
A
:
SEP
2004
.
PrintedinJapan
Allrightsreserved.
H
:
SEP
.
01,2008
Pub.No.
IME‑56420‑H
*
00014993217
*
*
00014993217
*
(
TATA
)
FM‑8800D/S
*
00014993217
*
*
00014993217
*
*00014993217*

i
SAFETY INSTRUCTIONS
WARNING
Hazardous voltage.
Can shock, burn or cause
serious injury.
Do not work inside the equip-
ment unless totally familiar
with electrical circuits.
Turn off the power at the mains switch-
board before beginning the installation.
Post a warning sign near the switch-
board to indicate that power should not
be applied while the equipment is being
installed.
Electrical shock, serious injury or fire can
result if the power is not turned off or is
applied while the equipment is being
installed.
Attach securely protective
earth to the ship's body.
The protective earth
(grounding) is required to the
AC/DC power supply unit to
prevent electrical shock.
Confirm that the power supply voltage
is compatible with the voltage rating
of the equipment.
Connection to the wrong power supply
can cause fire or equipment damage.
The voltage rating appears on the label
at the rear of the display unit.
Observe the compass safe distance to
prevent deviation of a magnetic
compass.
Standard
compass Steering
compass
1.45 m
CAUTION
FM-8800S 0.90 m
1.45 m
FM-8800D 0.95 m
0.85 m
IF-8810 0.55 m
0.75 m
IF-8820 0.50 m
1.50 m
HS-2003 0.95 m
0.40 m
HS-8800 0.30 m
1.20 m
RB-8800 0.80 m
1.50 m
RB-8810 1.00 m
(W/HS-8800)
(W/HS-8800)
0.90 m
PR-240 0.60 m
Do not approach the antenna
closer than 0.9 m (MPE by
FCC) when it is transmitting.
(MPE: Minimum Permissible Exposure)
The antenna emits radio waves
which can be harmful to the
human body.
FM-8800S
RF power density
on antenna aperture
Distance
100 W/m
2
0.11 m
10 W/m
2
0.33 m
FM-8800D
2 W/m
2
0.9 m
0.11 m
Description
required by
IEC 60945
IEC 60945
MPE by FCC
IEC 60945
IEC 60945
MPE by FCC
0.33 m
0.9 m
100 W/m
2
10 W/m
2
2 W/m
2
1.55 m
RB-8810-W
(W/HS-8810-W)
1.00 m

ii
SYSTEM CONFIGURATION
Transceiver Unit
FM-8800D
FM-8800S
Handset
HS-2003
VHF
Antenna
CH 70 RX
Antenna
AC/DC
Power Supply
Unit
PR-240
100-115/200-230 VAC
50/60 Hz, 1φ
Category of units
Antenna
All other units
Exposed to weather
Protected from weather
Category
Radio Battery
24 VDC
24 VDC
Junction
Box*
IF-8810
Printer
PP-510
PP-8800/A
External
Speaker
SEM-21Q
Wing handset
T/R AF output for VDR
MAX
2 sets
IEC61162-1 input
DSC information output
Unit
: Standard
: Optional
External alarm
Remote station
RB-
8800/8810
RB-8810-W
DMC I/F
IF-8820
MAX
4 sets
RB- 8800/8810
RB-8810-W
Distress Message Controller
DMC-5
*: Option for FM-8800S/D-N
Printer
IF+UTP-80FK
IF+UTP-58E
VHF console
RC-
8800
Omit for Russian Version
ALARM UNIT
IC-350

iii
EQUIPMENT LISTS
Standard Supply
Name Type Qty Code No. Remarks
FM-8800D-E-A
FM-8800D-E-N
FM-8800D-F-A
FM-8800D-F-N
FM-8800S-E-A
FM-8800S-E-N
FM-8800S-F-A
FM-8800S-F-N
FM-8800S-R-A
1 Transceiver Unit
FM-8800S-R-N
1 —
D: Duplex
S: Simplex
E: With handset
HS-2003
F: With microphone
DM-2003-F
A: With IF-8810
N: No IF-8810
R: Russian version
FP05-05700 000-054-228
For E-type
Handset HS-2003,
Hanger FP05-05510,
Others FP05-05511
2 Accessories*
FP05-05710
1
000-054-156 For F-type
Microphone DM-2003-F
3 Junction Box IF-8810 1 — For A-type
4 Installation
Materials* CP05-09900 1 000-054-227 Power cable 05S9371,
CP05-09901
5 Spare Parts* SP05-05501 1 005-377-820
Standard Supply for VHF Console
Name Type Qty Code No. Remarks
1 VHF Console RC-8800-SN
RC-8800-DN
RC-8800-SA
RC-8800-DA
RC-8800-SB
RC-8800-DB
1—D: Duplex FM-8800D
S: Simplex DM-8800S
N: No printer
A: With printer UTP-80FK
B: With printer UTP-58E
2 Installation
Masteries* CP05-10201 1 005-371-850
FP05-05800 000-054-372 Handset HS-2003 &
Handset hanger FP05-05510
3 Accessories*
FP05-05810
1
000-010-428 HS-2003, FP05-05510,
Thermal paper TP058-30CL
*: See lists at the end of this manual.

EQUIPMENT LISTS
iv
Optional Equipment
Name Type Code No. Remarks
Flush Mount Kit OP05-102 000-054-120
Junction Box IF-8810 — W/ Screw 5x20 4 pcs.
DMC Interface IF-8820 — No use for Russian version
RB-8800-15
(W/ 1.5 m Cable)
RB-8800-20
(W/ 2 m Cable)
—
·FP05-05701*,
·Handset HS-8800,
·Hanger W/DIST. button HG-8800
RB-8810-15
(W/ 1.5 m Cable)
RB-8810-20
(W/ 2 m Cable)
—
·FP05-05511*,
·Handset HS-8800,
·Hanger HG-8810
Remote Station
RB-8810-W-15 — W/ HS-8800-W-15
HS-8800-15 000-054-230 W/ 1.5 m Cable
HS-8800-20 000-054-171 W/ 2 m Cable
HS-8800-W-15 000-054-287 Waterproof
HS-2003-15 000-054-223 W/ Cable 1.5 m
HS-2003-20 000-054-390 W/ Cable 2.0 m
HS-2003-50S 000-054-391 W/ Straight cable 5.0 m
HS-6000FZ11 000-135-072
Handset
FP05-05700 000-010-246 HS-2003-15 & Hanger
HG-8800 000-054-229 For HS-8800
HG-8810 000-054-231 For HS-8800
FP05-05510 005-951-790 For HS-2003
Handset Hanger
AP-102 000-580-019 For HS-6000FZ11
Loudspeaker SEM-21Q 000-144-917
Dynamic Mic. Set OP05-57 000-045-775
Handset HS-6000FZ5,
Receptacle RDB-VHF(B),
Hanger AP-102
Carbon Mic. Set OP05-58 000-045-776
Handset HS-6000FZ6,
Receptacle RDB-VHF,
Hanger AP-102
Handset set OP05-42 000-045-778
Handset HS-6000FZ11,
Receptacle RDB-VHF(B),
Hanger AP-102
Mic. Receptacle Box RBD-VHF (B) 000-056-094
Microphone DM-2003-F 005-377-760 For transceiver unit only
(not RB-8800), **
Printer PP-510 —
Printer Interface IF-8500 —
AC-DC Power Supply PR-240 —
AP05-00800 000-057-721
Whip antenna FAB-151D,
Mounting plate 4-310071,
Coax. Cable 5D-2V 10m,
Connector M-P-5 2 PCS
AP05-00810 000-057-722
Whip antenna RA106,
Mounting plate RA115,
Coax. Cable 05S9104 5m
AP05-00900 000-057-739 Whip antenna 396-1,
Mounting plate 4187
Antenna Material
AP05-01000 000-054-123
Whip antenna FAB-151D,
Mounting plate 4-310071,
Connector M-P-7 2 PCS
*: See lists at the end of this manual
**: Microphone DM-2003-F can be connected to transceiver unit instead of handset HS-2003. However,
in this case, any remote station is disabled.

EQUIPMENT LISTS
v
Name Type Code No. Remarks
AP05-01100 000-054-224
Whip antenna 150M-W2VN,
Coax. Cable 5D-2V 10m,
Connector M-P-5 2 PCS
AP05-01200 000-054-232
Whip antenna FAB-151D,
Mounting plate 4-310071,
Coax. Cable 5D-2V 10m,
Connector M-P-5 & M-P-7
Antenna Material
AP05-01210 000-054-233
Whip antenna FAB-151D,
Mounting plate 4-310071,
Coax. Cable 5D-2V 20m,
Connector M-P-5 & M-P-7
05S0309 *10M* 000-106-043 10m
05S0309 *20M* 000-106-044 20m
05S0309 *30M* 000-106-046 30m
05S0309 *40M* 000-106-047 40m
Signal Cable
05S0309 *50M* 000-106-048 50m
000-111-680 5m
000-120-792 10m
000-120-793 15m
000-120-794 20m
Twisted Cable CO-SPEVV-SB-C
0.2x2P
000-120-214 30m
RC-8800-N-75BG -
Without Printer
RC-8800-A-75BG -
With Printer UTP-80FK
VHF Console Kit
RC-8800-B -
With Printer UTP-58E
PP-8800
Printer PP-8800A - W/ power cable
Emergency lamp EMG-1T 000-138-378 For rack console, cable attached
Cable 05S9509-L500 000-168-955-10 For handset extension

EQUIPMENT LISTS
vi

1-1
1. MOUNTING
Transceiver Unit
General mounting considerations
Determine the mounting location for the transceiver unit considering operator convenience,
proximity to the power source and the ground location. Keep these and the following points
in mind when selecting a mounting location.
• Locate the unit in a place free of water spray and water splash.
• Keep the unit out of direct sunlight because of heat that can build up inside the unit.
• Leave a little slack in cables to allow a service technician to move the radio from its usual
location with the cables connected. This lets him make tuning and other adjustments on a
“live” set.
• Do not install the unit where flammable gases are stored.
• Select a well-ventilated area.
• Ensure the mounting location is strong enough to support the weight of the unit (approx. 6
kg) under the condition of continued vibration normally encountered aboard the vessel. If
necessary, reinforce the mounting area with a doubling plate or lining block.
• Leave sufficient space at the sides and rear of the unit for maintenance and service
purposes and to provide for circulation of cooling air. See outlines drawings at the back of
this manual.
• For flush mounting, select a location where the LCD can be easily viewed.
• The transceiver unit will affect a magnetic compass if placed too near the compass.
Observe the compass safe distance to prevent deviation of a magnetic compass,
referring to page “ i ”.
Note: Take great care not to press the DISTRESS switch during the installation. If you
accidentally press the switch, immediately turn off the equipment and contact
appropriate authority by telephone.

1. MOUNTING
1-2
Overview of mounting methods
Overhead
Flush Mount
Tabletop
Bulkhead
Keep pressed for 4 s in case of DISTRESS.
The alert is transmitted with steady lighting.
PQRS
GHI
IntCom
*
7
4
1
WXYZ
MNO
PRINT
DW
#
0
HI/L0
TUV
JKL
ACK
SCAN
8
5
9
6
ENT
FILE
MENU
DEFABC
23
CH16 DISTRESS
MSG
CALL SHIFT
LOG
CANCEL
ALM STOP
USA
INTL
TEST
Keep pressed for 4 s in case of DISTRESS.
The alert is transmitted with steady lighting.
PQRS
GHI
IntCom
*
7
4
1
WXYZ
MNO
PRINT
DW
#
0
HI/L0
TUV
JKL
ACK
SCAN
8
5
9
6
ENT
FILE
MENU
DEFABC
23
CH16 DISTRESS
MSG
CALL
SHIFT LOG
CANCEL
ALM STOP
USA
INTL
TEST
Keep pressed for 4 s in case of DISTRESS.
The alert is transmitted with steady lighting.
PQRS
GHI
IntCom
*
7
4
1
WXYZ
MNO
PRINT
DW
#
0
HI/L0
TUV
JKL
ACK
SCAN
8
5
9
6
ENT
FILE
MENU
DEFABC
23
CH16 DISTRESS
MSG
CALL
SHIFT LOG
CANCEL
ALM STOP
USA
INTL
TEST
Overview of mounting methods

1. MOUNTING
1-3
Mounting procedure for tabletop, overhead and bulkhead mounting
1. Using the hanger as a template, mark fixing holes in the mounting location.
2. Fix the hanger to the mounting location with self-tapping screws and washers (supplied).
(For added support, use nuts, bolts and washers instead of self-tapping screws.)
3. Screw the knob bolts with washers into the transceiver unit.
4. Set the transceiver unit to the hanger and tighten knob bolts.
265 251
110
Keep pressed for 4 s in case of DISTRESS.
The alert is transmitted with steady lighting.
VOL/PWR
OFF AUTO
HANDSET
SQL
PQRS
GHI
IntCom
*
7
4
1
WXYZ
MNO
PRINT
DW
#
0
HI/L0
TUV
JKL
ACK
SCAN
8
5
9
6
ENT
FILE
MENU
DEFABC
23
CH16 DISTRESS
MSG
CALL
SHIFT LOG
CANCEL
ALM STOP
USA
INTL
TEST
CH
ALARM
ＰＵＳＨ  ＴＯ  ＥＮＴＥＲ
Keep pressed for 4 s in case of DISTRESS.
The alert is transmitted with steady lighting.
VOL/PWR
OFF AUTO
HANDSET
SQL
PQRS
GHI
IntCom
*
7
4
1
WXYZ
MNO
PRINT
DW
#
0
HI/L0
TUV
JKL
ACK
SCAN
8
5
9
6
ENT
FILE
MENU
DEFABC
23
CH16 DISTRESS
MSG
CALL
SHIFT LOG
CANCEL
ALM STOP
USA
INTL
TEST
CH
ALARM
ＰＵＳＨ  ＴＯ  ＥＮＴＥＲ
100 100
• All dimensions in millimeters.
• Leave sufficient space at the sides and rear of the unit to provide easy access for
maintenance and service.
Mounting dimensions for tabletop, overhead and bulkhead mounting

1. MOUNTING
1-4
Mounting procedure for flush mount (option)
Requires optional flush mount kit OP05-102 (Code No. 000-054-120). Prepare a cutout in
the mounting location whose dimensions are as shown in the figure below.
Flush mount kit OP05-102
Name Type Code No. Qty
1 Mounting plate 05-093-1211 100-323-160 1
2 Self-tapping screw 5x20 000-802-081 4
3 Hex screw M8x16 000-882-075 2
Pilot holes (4 pcs.)
122 0.5
±
30 1
±
277 0.5
±
280 1
±
260 1
±
105 1
±
251 244
#150
20
14 27
Mounting dimensions for flush mount
VHF Antenna
The antenna requirements
Any good quality antenna meeting the requirements shown below may be used. A high-gain
antenna is preferable.
• Frequency range: 155 to 164 MHz
• Impedance: 50 ohms
• Polarization: Vertical
• Handling power: 30 W/ min
• Quality: Able to withstand marine environment
Mounting considerations
• The antenna should be well separated from nearby antennas, masts, and other interfering
objects.
• The higher the antenna is mounted above the horizon, the further the communications
range.
Mounting procedure
The basic mounting procedure for antennas supplied by FURUNO is as follows, however
consult appropriate outline drawing for details.
1. Fasten the antenna bracket to the stanchion.
2. Set the antenna to the antenna bracket and tighten bolts.
3. Screw the coaxial cable plug into the antenna.

1. MOUNTING
1-5
CH70 RX Antenna
The antenna should be well separated from nearby antennas, masts, and other interfering
objects.
The mounting procedure is the same as that for the VHF antenna, however consult
appropriate outline drawing for details.
Handset Hanger
The handset hanger can be mounted at the left side of the transceiver unit. The mounting
location should provide easy access to front panel controls while operating the handset.
Also, the length of the standard handset cable is 50 cm, so locate the handset hanger within
50 cm of the unit. (Longer cables are available optionally.)
Power Supply (option)
For Convention vessels, both AC and DC power must be fed to the FM-8800D/8800S, via
an AC-DC power supply. When AC input fails, DC power is supplied. FURUNO can supply
an AC-DC power supply unit, the PR-240.
Mounting considerations
When selecting a mounting location, keep in mind the following points.
• Select a location which provides adequate ventilation.
• The location must be clean and dry.
• The mounting location must be able to support the weight of the unit (14.5 kg) under the
continued conditions of vibration normally encountered aboard the vessel. If necessary,
reinforce the mounting location.
• The PR-240 will affect a magnetic compass if it is placed to near the compass. Observe
the compass safe distance to prevent deviation of a magnetic compass, referring to page
“ i ”.
Mounting
Refer to outline drawing.

1. MOUNTING
1-6
Printer (option)
Printer PP-510
To mount the printer, refer to the printer outline drawing at the back of this manual.
1. Select a flat surface.
2. Fix the mounting base to the mounting location with four screws (supplied).
3. Lay the printer on the top of the mounting base and fasten it with the mounting fixtures
(two at each side and one at rear).
Mounting Fixture
Mounting Fixture
Mounting Dimensions 300 (H) x 396 (W) mm
Mounting of Printer PP-510
Printer PP-8800
The printer PP-8800 is flush-mounted in a panel. Refer to the outline drawing at the back of
this manual.
1. Make a cutout of 208(w) x 118(h) mm.
2. Set the printer and fix it with four self-tapping screws (4x16).
Printer Interface (option)
The printer interface IF-8500 is required for the printer PP-510 which is commonly used with
the FM-8800D/S and other MF/HF radio communication equipment. To mount the unit, see
the outline drawing at the back of this manual.
External Loudspeaker (option)
The external loudspeaker can be installed on a tabletop, the overhead or a bulkhead.
Fasten the loudspeaker to the mounting location with self-tapping screws, or nuts, bolts and
washers. For mounting dimensions, see the outline drawing at the back of this manual.

1. MOUNTING
1-7
Junction box IF-8810/ DMC interface IF-8820
Note: DMC interface IF-8820 is not used for Russian version.
To install the remote box RB-8800/RB-8810, wing handset, etc., the junction box IF-8810 is
required. Install the junction box near the transceiver unit. Approx. 3 m cable is preattached
to the junction box to connect to the transceiver unit.
To connect Furuno’s distress message controller DMC-5, the DMC interface IF-8820
(option) is required.
1. Open the cover.
2. Mount the unit with four self-tapping screws (5x20).
Fixing holes 5mm dia.
240
100 Note: This plug is not
fitted in IF-8820.
Mounting the junction box/DMC interface

1. MOUNTING
1-8
Remote station RB-8800/RB-8810 (option)
Up to four remote stations can be connected in a daisy chain.
Note: For the remote station RB-8800, there are two method of cable entry: bottom-side
entry and rear-side entry. For rear-side entry, make one or two holes of more than 12
mm diameter. For last station in the daisy chain, just one cable entry hole is needed.
1. Remove screws on the handset hanger (four for RB-8800, six for RB-8810).
2. Remove upper chassis of the hanger.
3. Mount the base of the hanger to a bulkhead with self-tapping screws 4x20 (four for
RB-8800), or 4x16 (two for RB-8810).
4. After connecting cables, assemble the remote station.
5. For RB-8800, attach blind seals on the screws.
Cable entry
Cable entry
(Rear)
77
#150
40 63
40 0.5
±
φ
4- 4.5
140 0.5
±
33
HS-8800
HG-8800
VOLUME
DISTRESS
12
φ
12
φ
20 30
40 0.5
±
Handset
Handset hanger
Screws 4 pcs.
Attach blind seal
on the screws. Cover of handset hanger
Nameplate
Cable entry
(Bottom)
Fixing holes
Remote station RB-8800
HS-8800
HG-8810
12,
φ
Hanger Hanger mounting base
(77)
57
Handset
Hanger
Cable entry
#150 (208)
65
208
Nameplate
φ
2- 4.5
Fixing hole
145 0.5
±
22
Cable entry
42
Remote station RB-8810

1. MOUNTING
1-9
Outdoor mounting of waterproof-type remote station RB-8810-W
Remote station RB-8810-W (with waterproof-type handset HS-8800-W) can be mounted
outdoors if it is set in a waterproof box. The hanger should be coated as directed below with
silicone sealant for waterproofing.
Note 1:Be sure to use a waterproof box to mount the RB-8810-W outdoors. The
waterproofing category of the RB-8810-W is IEC60529 IP56, however this should
be protected from the weather (IEC 60945).
Note 2:Before sealing with silicone sealant (for waterproofing), do the termination setting
(only for termination device, see page 2-7), connect cables and conduct the
performance test. After sealing, do not open the handset hanger.
1. Fix the mounting base with self-tapping screws. Coat exposed part of these screws with
silicone sealant.
2. Attach the cable from the transceiver unit or junction box. Coat cable around cable
entrance with silicone sealant.
3. Fix the cover of the handset hanger. Coat junction between mounting base and cover
with silicone sealant.
2. Coat all around the cable
at cable entry.
3. Coat all around
the junction.
Note: Confirm that plastic washers are
in screw holes before fixing cover.
1. Coat self-tapping screws.

1. MOUNTING
1-10
VHF console
Install the rack console where the equipment can be easily operated, checked and serviced.
Consult with shipyard personnel and ship's officer-in-charge to determine best location. The
location must satisfy the following points:
• Select a location where controls can be easily operated.
• Select a location where shock and vibration are minimal.
• Locate the console away from water splash and rain.
• The temperature and humidity of the location should be both stable and moderate.
Fixing
1. Ask shipyard personnel to tighten six M5 nuts or six M5 bolts to the fixing holes (on the
wall), referring to the outline drawing at the back of this manual.
2. Detach the cover assembly from the console.
3. Hang VHF console on bolts.
4. Screw the console with the bolts or nuts tightly.
5. Attach the cover assembly to the console.
Note: When you connect wires as soon as attaching console, refer to paragragh 2-10.
6. Attach the handset hanger with two screws.
7. To attach the optional emergency lamp, connect the cable to the terminal board, and
then attach the lamp to the console. Refer to the interconnection diagram and out line
drawing.
(371)
(371)
330
250
298 ± 0.5
170 ± 0.5
145
170 ± 0.5
480
30
40
190
75°
40
(500)
30
(266)
#50
EMG-1T
EMERGENCY LAMP
HANDSET HANGER
CABLE ENTRY
(REAR)
FIXING HOLES
TERMINAL BOARD

2-1
2. CONNECTIONS
Overview
The figure below shows where to connect various equipment at the rear of the transceiver
unit.
EXT SP
Connects external
loudspeaker.
ANT
Connects antenna.
CH70 RX ANT
Connects DSC
antenna here.
24VDC
Connects power
cable.
PRINTER
Connects printer
PP-510.
Ground terminal.
IEC61162-1 (NMEA)/REMOTE
Connects junction box IF-8810.
FM-8800D/8800S, rear view
Connection of Power Supply
Convention vessels, 100/220 VAC ship’s mains
Convention vessels must supply both AC and DC power to the FM-8800D/8800S, via an
AC-DC power supply unit. Both AC and DC are supplied by the AC-DC power supply unit,
and when AC input fails DC power is activated.
Connect the radio battery to the DC IN terminal on the PR-240. Connect the AC ship’s
mains to the AC IN terminal on the PR-240.
Radio battery (24 VDC)
Attach the connector supplied to the power cable and plug it into the 24VDC connector at
the rear of the transceiver unit. Connect the wire ends to the radio battery line.

2. CONNECTIONS
2-2
Connection of VHF Antenna
The VHF antenna is connected to the transceiver unit with a 50 ohm coaxial cable, type
5D-2V. Be sure to leave some slack in the cable for future service and maintenance.
Lay the coaxial cable and attach an M-type plug to the cable (if necessary) as follows.
1. Remove the sheath by 20 mm.
2. Bare 13 mm of the center conductor. Trim braided shield by 5 mm and tin.
3. Slide coupling ring onto cable.
4. Screw the plug assembly on the cable.
5. Solder plug assembly to braided shield through solder holes. Solder contact sleeve to
conductor.
6. Screw coupling ring into plug assembly.
7. Screw the plug into the ANT connector at the rear of the transceiver unit.
How to attach the M-type plug to the coaxial cable