Instruction Manual
III
Simrad RD68
Fixed DSC VHF Radio
MANUAL
All manuals and user guides at all-guides.com
all-guides.com
Instruction Manual
1 GENERAL
1.1 Introduction ........................................................................... 7
1.2 Licensing ............................................................................... 8
1.3 Entering MMSI numbers ....................................................... 9
1.4 Group ID MMSI .................................................................... 10
2 OPERATION
2.1 General .................................................................................. 11
2.2 Rotary controls ...................................................................... 11
2.3 Backlighting .......................................................................... 12
2.4 Changing channels ................................................................ 12
2.4.1 Standard International channels .................................. 12
2.4.2 Auxiliary & Private channels ...................................... 13
2.5 Transmit power ...................................................................... 14
2.6 Making a DSC call ................................................................ 14
2.7 Making a Distress Alert call ................................................ 17
2.8 Receiving a DSC call ............................................................ 19
2.9 Dual Watch ............................................................................ 20
2.10 Tri-Watch ............................................................................. 21
2.11 Scan mode ............................................................................ 22
2.11.1 Inhibiting channels from scan ................................... 22
2.12 Memory Scan ...................................................................... 23
2.12.1 Add/remove channels from Memory Scan ............... 24
2.13 Priority & User channel select ............................................ 25
2.13.1 Programming the User channel ................................ 25
2.14 Viewing the call log ............................................................. 26
3 MISCELLANEOUS FUNCTIONS
3.1 Adjusting the LCD contrast ................................................... 27
3.2 Entering position and time manually .................................... 28
3.3 Entering local time ................................................................ 30
3.4 Viewing the directory ............................................................ 31
3.4.1 Adding an entry to the directory ................................. 32
3.4.2 Editing/deleting an entry ............................................. 33
3.5 Disabling the key beep .......................................................... 35
3.6 Second country mode ............................................................ 36
3.7 Speaker mute (handset models only) .................................... 36
4 INSTALLATION
4.1 VHF installation .................................................................... 37
4.2 Antenna installation .............................................................. 40
4.3 Electrical interference suppression ........................................ 42
V
All manuals and user guides at all-guides.com
5 APPENDIX
5.1 Operating procedures ............................................................. 43
5.1.1 Sending a Distress Alert .............................................. 43
5.1.2 Acknowledging and relaying a Distress Alert ............ 43
5.1.3 Cancelling a Distress Alert ......................................... 44
5.1.4 Alerting all vessels within range ................................. 44
5.1.5 Calling a coast radio station ........................................ 44
5.1.6 Making an intership call ............................................. 44
5.2 NMEA sentences received ..................................................... 44
5.3 Transmission range ................................................................ 45
5.4 Channel frequencies .............................................................. 46
5.5 Troubleshooting ..................................................................... 47
5.6 Accessories ............................................................................ 48
5.7 Technical specifications ......................................................... 48
5.8 Dimensions ............................................................................ 49
5.9 Declaration of Conformity .................................................... 50
5.10 Service & Warranty ............................................................. 51
RD68 VHF
VI
E03912 Issue 2.0
All manuals and user guides at all-guides.com
Instruction Manual
7
E03912 Issue 2.0
1 GENERAL
1.1 Introduction
The RD68 is a combined VHF radio and Class D Digital Select-
ive Calling (DSC) unit. It supports the latest GMDSS require-
ments for non-SOLAS vessels from the International Maritime
Organization (IMO). This will enable you to make digitally
selected calls, which are quicker and simpler to make than tra-
ditional voice calls using channel 16. Should a distress situation
occur, with the RD68 you can quickly raise an alert, indicating
your identity, your position, and automatically establish distress
communication on the emergency voice channel.
The RD68 is robustly constructed using a pressure die-cast alu-
minum case for effective heat dissipation, ensuring maximum
transmission performance even after many hours’ constant use.
Thank you for choosing Simrad!
If you are pleased with your VHF, we hope you will be interest-
ed in our range of marine electronic equipment, which is manu-
factured to the same high standards as the RD68. Please contact
your nearest Simrad Agent for a catalog showing our increasing
range of high tech navigational instruments, GPS, Autopilots,
Radar, Fishfinders and VHF radio sets.
Simrad operates a policy of continual development and reserves
the right to alter and improve the specification of their products
without notice.
Fig 1.1 - RD68 combined VHF & DSC
All manuals and user guides at all-guides.com
RD68 VHF
8
E03912 Issue 2.0
1.2 Licensing
Note Prior to use please check the national licensing requirements
for operators.
In the UK license applications and queries should be made to
the following authority:
Ship Radio Licencing
Radio Licencing Centre
The Post Office
PO Box 1495
Bristol BS99 3QS
Website: www.radiolicencecentre.co.uk/rlc
A set may only be operated by or under the supervision of the
holder of a Marine Radio Operator’s Certificate of Competence
and Authority to Operate. This is awarded on completion of the
Marine Short Range Certificate course administered by the Royal
Yachting Association:
Royal Yachting Association
RYA House
Ensign Way
Hamble
Southampton SO31 4YA
Website: www.rya.org.uk
Tel. 0845 345 0400
Holders of the Restricted Certificate of Competence in Radio-
telephony (which covers MF/HF SSB, etc.) do not need a sepa-
rate VHF certificate.
In all other countries, please contact your regional authority for
information.
Note North American Users – To meet FCC (Federal Communica-
tions Commission) rules on Radio Frequency Exposure, it is
recommended that the VHF antenna is mounted at least 3 m
(10 ft) away from any area accessible to any personnel on board.
If this distance is achieved by vertical separation, the antenna
must be at least 5 m (16.5 ft) above deck. This guideline applies
only to antennas not exceeding 9dBi gain.
WARNING Failure to observe these recommendations may
expose those within the MPE (maximum permit-
ted exposure) radius of 3 m (10 ft) to RF absorp-
tion levels that exceed the FCC safe limits.
All manuals and user guides at all-guides.com
Instruction Manual
9
E03912 Issue 2.0
1.3 Entering MMSI numbers
At the time of issue of your vessel’s radio license, an MMSI
(Maritime Mobile Service Identifier) must be requested. This is
a nine-digit number which must be permanently entered into the
RD68 when the radio is first set up, otherwise the DSC func-
tions cannot be accessed.
Note If the boat or the RD68 are subsequently sold, the radio must be
returned to an authorized Simrad agent for the MMSI number
to be erased and the new owner’s MMSI number entered.
➞
For licensing details, please refer to section 1.2.
To enter the vessel’s MMSI number:
12:43
Rad
MMeennuu
52o16N
001
o
23E
Rx
12:43
DSC
LCD
Posn
MMoorree
52o16N
001
o
23E
Rx
12:43
DDSSCC
T/W
M/S
Scan
INT
Hi
Lite
Rx
/continued
All manuals and user guides at all-guides.com
all-guides.com
RD68 VHF
10
E03912 Issue 2.0
Note If an error is made, press to move back and edit the number.
You will be asked to confirm the number. Re-enter the MMSI
and press E.
CAUTION It is important that the MMSI entered is checked care-
fully, as it can only be entered once. To change the
MMSI number after it has been programmed, the unit
must be returned to an authorized Simrad Dealer to
erase the existing number.
1.4 Group ID MMSI
For boats that are part of a flotilla, racing fleet, or other group, a
Group ID MMSI number can also be entered while in the
MMSI entry screen by pressing softkey 4. Follow the procedure
described above to enter the Group MMSI. Unlike the vessel
MMSI number, this can be changed later by the user.
DSC
MMMMSSII
Dir
More
12:44
Ships MMSI
*********
Group MMSI
000000000
DSC
12:44
Ships MMSI
002325___
DSC
52o16N
001
o
23E
Rx
Enter the MMSI number
using the keypad.
Press E to enter
Press this key to enter
the Group ID
Press this key to enter
the MMSI number
All manuals and user guides at all-guides.com
Instruction Manual
11
E03912 Issue 2.0
2 OPERATION
2.1 General
The RD68 VHF is very simple to operate, with the controls
falling into five groups:
1. The rotary Volume (On/Off) & Squelch controls.
2. The alphanumeric keypad used to select the channel, MMSI
number, etc.
3. The dedicated controls, for commonly used functions such
as output power, Dual Watch, and channel 16 select, etc.
4. The four softkeys to the right of the display are multi-
function keys whose function changes depending on which
menu is displayed. The label showing the current function for
each softkey appears on the right side of the display (see left).
5. There is also a Distress button under a sliding cover. This
must only be used in an emergency (see section 5.1).
The radio functions are split into two main modes:
• Radio mode allows access to the standard VHF radio func-
tions, such as Tri-Watch, scanning, etc.
• DSC mode covers the digital selective calling functions.
These modes are toggled by pressing softkey 1 (labeled DSC or
RAD).
At any stage of the DSC mode menu structure, pressing the DSC
softkey will return to the DSC mode main menu. At any stage
of the DSC mode menu structure, pressing the C key will can-
cel any unconfirmed action, or step back one level in the menu
structure.
Note Some menu options will only be displayed if the relevant infor-
mation is available.
If the radio is receiving NMEA GPS data, the current Lat/Long
will be displayed when in DSC mode, and the time will be dis-
played in both Radio and DSC modes in 24-hour UTC (GMT)
format (the local time can also be entered).
2.2 Rotary controls
Switch the radio on by turning the VOLUME knob clockwise.
To increase the volume, turn the knob further clockwise. Turn
the knob fully counterclockwise to switch off.
The SQUELCH knob is used to adjust the receiver muting
threshold (squelch) level. To cut out weaker signals, increase
the squelch until the background interference noise disappears.
To receive weaker signals, decrease the squelch.
SOFTKEY LABEL SC1
SOFTKEY LABEL SC2
SOFTKEY LABEL SC3
SOFTKEY LABEL SC4
1
2
3
4
Softkeys & labels
All manuals and user guides at all-guides.com
RD68 VHF
12
E03912 Issue 2.0
2.3 Backlighting ( )
INT
Hi
LLiittee
Rx
12:40
DSC
T/W
M/S
Scan
INT
Hi
Lite
Rx
12:40
Pvt
Wx
Aux
Aux
INT
Hi
Lite
Rx
12:41
DSC
T/W
M/S
Scan
If channel selection is
not confirmed within 2
seconds (by pressing E),
the radio will revert to
the original channel
Enter the channel
number using the
numeric keypad
There are five levels of brightness – press and hold the key
to step through and release when the required level is shown.
2.4 Changing channels
2.4.1 Standard International channels
Note To select channels, the RD68 will need to be in Radio mode. If
in DSC mode, press the RAD softkey before entering the chan-
nel number.
All manuals and user guides at all-guides.com
Instruction Manual
13
E03912 Issue 2.0
2.4.2 Auxiliary & Private channels
This function is used to select channels which are not part of
the standard International channel set, for example, channels M
and M2 in the UK, or the US Wx Weather channels.
Note Standard availability of channels includes M & M2 in the UK, or
one or more of L1–L3 or F1–F3 in Scandinavia (cf. section 5.3).
INT
Hi
Lite
Rx
12:41
Pvt
Wx
Aux
Aux
INT
Hi
Lite
Rx
12:41
PPvvtt
Wx
Aux
Aux
12:42
STEP 2 (Auxiliary)
Press Aux
▲ or Aux▼ to
scroll through the available
Auxiliary channels &
press E to select
INT
Hi
Lite
Rx
Pvt
WWxx
Aux
Aux
12:42
INT
Hi
Lite
Rx
Pvt
Wx
AAuuxx
AAuuxx
STEP 2 (Weather)
Press Wx to select
Weather Ch2
STEP 1
To select an Auxiliary channel
press any numeric key –
To select a Weather or
Private channel, press the
relevant number key (e.g. 2 for
Private Ch2 or Weather Ch2 –
STEP 2 (Private)
Press Pvt to select
Private Ch2
All manuals and user guides at all-guides.com
RD68 VHF
14
E03912 Issue 2.0
2.5 Transmit power
This function allows toggling of the transmit power between
25W (Hi) and 1W (Lo) for short range transmissions, for exam-
ple, when in a marina. This preserves battery power.
12:42
DSC
T/W
M/S
Scan
12:42
DSC
T/W
M/S
Scan
INT
LLoo
Lite
Rx
INT
HHii
Lite
Rx
Note Regulations restrict some channels, such as 15 and 17, to low
power only, in which case this key will have no effect.
2.6 Making a DSC call
Press the DSC softkey to enter DSC mode:
12:43
DDSSCC
T/W
M/S
Scan
INT
Hi
Lite
Rx
/continued
All manuals and user guides at all-guides.com
all-guides.com
Instruction Manual
15
E03912 Issue 2.0
/continued
12:43
Rad
CCaallll
Menu
52o16N
001
o
23E
Rx
12:43
RRoouuttiinnee ttoo
Excalibur
Rx
12:43
TTyyppee
Ch16
Send
AAllll SShhiippss
SSaaffeettyy
Rx
12:43
TTyyppee
Ch16
Send
AAllll SShhiippss
UUrrggeennccyy
Rx
12:44
GGrroouupp ccaallll
000099999999999999
Rx
Type
Ch26
Send
TTyyppee
Dir
Ch26
Send
Select call type and
press Send to transmit
12:43
RRoouuttiinnee ttoo
________
Rx
12:43
RRoouuttiinnee ttoo
002325567
On Ch26
Press E to send
Use keypad to type in
MMSI number and press
E, then Send
MANUAL ENTRY
To manually enter an MMSI
number (Routine call):
SELECTING CALL TYPE
Press Type to scroll through
the different types of calls
(see also p. 16):
Only displayed if a Group
MMSI number has been
entered (see section 1.3)
Usekey to
correct any
mistakes
12:43
Waiting for
acknowledge
Rx
Stop
Press Stop to
cancel call
All manuals and user guides at all-guides.com
RD68 VHF
16
E03912 Issue 2.0
12:44
Rad
CCaallll
Menu
52o16N
001
o
23E
Rx
12:45
Reply on channel
1177
Rx
CChhaann
12:44
Routine to
Excalibur
Rx
Type
DDiirr
Ch26
Send
12:44
Routine to
Hbrmaster
Rx
Type
Dir
Ch26
SSeenndd
12:45
Routine to
Excalibur
Rx
Type
Dir
CChh2266
Send
Press Dir to scroll
through directory
entries
Press Send
to transmit
call
Press softkey 3 (ChXX) to
specify voice channel.
Voice channel can only be
specified on Routine, Safety
and Group calls (simplex only).
Urgency and Distress calls
are set to Ch16.
When making a Routine call to
a coast station (MMSI begins
with “00”), the option
to select a voice channel
is not available.
VOICE CHANNEL SELECTION
To specify which channel is to be
used in voice communication
MMSI DIRECTORY
Use the directory (see sec-
tion 3.4) to select a com-
monly used MMSI:
12:43
RRoouuttiinnee ttoo
Hbrmaster
On Ch26
Press E to send
12:43
Waiting for
acknowledge
Rx
Stop
Press Stop to
cancel call
Press Chan to scroll through a
selection of pre-programmed
channels, or type in the channel
number and press E.
All manuals and user guides at all-guides.com
Instruction Manual
17
E03912 Issue 2.0
2.7 Making a Distress Alert call
WARNING This call should only be made if the vessel is in a
genuine distress situation. It is an offense to send
a Distress Alert call if the vessel or crew are not in
grave and imminent danger (see section 5.1).
The DISTRESS button is located under a protective cover that
must be slid back before the button can be pressed. Press the
DISTRESS button to access the Distress Alert screen:
12:46
Distress Alert
52
o
16N 001o23E
12:46 UTC
Undefined
M.O.B
Fire
Flooding
Collision
Grounding
Listing
Sinking
Adrift
/continued
Pressto scroll
through distress categories
Piracy
12:46
Distress Alert
52
o
16N 001o23E
12:46 UTC
Abandoning
All manuals and user guides at all-guides.com
RD68 VHF
18
E03912 Issue 2.0
To send the call, press and hold the DISTRESS key for five
seconds. A countdown to the transmission will be displayed.
Release the key at any time during this countdown to abort the
transmission and press C to return to the main menu.
The Distress Alert transmission contains the following data:
• The vessel’s MMSI
• The vessel’s position (either from the NMEA 0183 input, or
manually entered)
• The time (from NMEA or manual)
• The nature of the distress
Note If the boat’s position and time are not being received via the
NMEA interface, then the display will allow this data to be
entered manually (refer to section 3.2 for more details).
After the Distress Alert has been sent, the RD68 will tune to
channel 16 and will automatically repeat the alert approximately
every four minutes, until either an acknowledgment is received
or C is pressed (it is not recommended that the Distress Alert is
cancelled manually by pressing C, unless you are requested to
do so by the rescue authorities).
While the Distress Alert remains active, an intermittent alarm
will continue to sound.
When an acknowledgment is received from the Rescue Co-
ordination Center, this will automatically cancel the Distress
Alert transmission. The subsequent rescue co-ordination will be
performed using the voice working channel.
12:47
DISTRESS ALERT
Sending in
5 secs
All manuals and user guides at all-guides.com
Instruction Manual
19
E03912 Issue 2.0
12:50
Sinking
OOKK
23
oo
47’N
001
oo
35’E
12:50 UTC
2.8 Receiving a DSC call
When a call is received, the RD68 will ring and the display will
show the call information.
Press Ack (for individual calls requesting acknowledgment
only) or OK to cancel and switch to the working channel. Press
Stop to cancel ring only.
12:48
Individual
AAcckk
Routine Stop
From 987654321
Ch06
12:48
Individual
AAcckk
Routine Stop
From Excalibur
Ch06
12:48
All Ships
OOKK
Safety Stop
From 987654321
Ch16
12:48
All Ships
OOKK
Urgency Stop
From 987654321
Ch16
12:50
Group call
OOKK
Routine Stop
From Excalibur
Ch06
Individual Routine call
Individual Routine call from
MMSI stored in directory
All Ships Safety call All Ships Urgency call
Group call
12:50
Distress OK
Alert
From 987654321
Ch16
Distress Alert call
Press
▼ key for more
information
All manuals and user guides at all-guides.com
all-guides.com
RD68 VHF
20
E03912 Issue 2.0
2.9 Dual Watch
Dual Watch allows the radio to scan between a selected working
channel and the priority channel (normally Ch16).
Note Normal VHF functions will not be available when in Dual Watch
mode. To change channel or transmit, press 16, D/W,or C to
exit Dual Watch. DSC functions can still be accessed by press-
ing DSC; however, sending a DSC call will automatically can-
cel Dual Watch.
12:52
DSC
T/W
M/S
Scan
12:52
DSC
INT
Hi
CChh1166
DD//WW
12:52
DSC
INT
Hi
CChh1166
DD//WW
INT
Hi
Lite
Rx
The RD68 will monitor the working channel and the priority channel sequentially
Press the D/W key
12:52
DSC
T/W
M/S
Scan
Select a working channel
INT
Hi
Lite
Rx
All manuals and user guides at all-guides.com
Instruction Manual
21
E03912 Issue 2.0
2.10 Tri-Watch
Tri-Watch operates on the same principle as Dual Watch, but
this function scans between the working channel, priority chan-
nel, and the User channel. For more information on the User
channel and how it is specified, please refer to section 2.13.
12:53
12:53
DSC
Adv
INT
Hi
CChh1166
TT//WW
12:53
DSC
Adv
INT
Hi
CChh1166
TT//WW
12:53
DSC
Adv
INT
Hi
CChh1166
TT//WW
INT
Hi
Lite
Rx
Select a working channel
and press the T/W key
DSC
TT//WW
M/S
Scan
12:54
DSC
AAddvv
INT
Hi
CChh1166
TT//WW
Pressing Adv will manually
advance the scan onto the next
channel in the sequence
Note
As with Dual Watch, normal VHF functions will not be available
when in Tri-Watch mode. Exit Tri-Watch by pressing 16 or C.
All manuals and user guides at all-guides.com
RD68 VHF
22
E03912 Issue 2.0
2.11 Scan mode
The Scan function cycles the RD68 sequentially through each
enabled channel, pausing when a signal is detected.
12:54
DSC
T/W
M/S
SSccaann
INT
Hi
Lite
Rx
12:54
DSC
Inh
Adv
INT
Hi
Lite
SSccaann
Press Adv to manually
advance to the next channel in
the scan sequence
Note While in Scan mode, normal VHF functions are not available.
To exit Scan mode, press C or 16.
2.11.1 Inhibiting channels from scan
In some areas the Scan function may repeatedly lock on a chan-
nel at each cycle, for example, if it is transmitting a carrier sig-
nal. Rather than pressing Adv each cycle, selected channels
may be inhibited from the scan cycle.
1. While in Scan mode
2. In VHF mode
12:55
DSC
IInnhh
Adv
INT
SSccaann
IInnhh
Scan
12:55
DSC
T/W
M/S
SSccaann
INT
SSccaann
IInnhh
Rx
Press
and hold
Select channel to be
inhibited, then press and
hold Scan (double beep)
All manuals and user guides at all-guides.com
Instruction Manual
23
E03912 Issue 2.0
To re-enable an inhibited channel into the scan cycle, repeat
sequence 2:
Select channel to be enabled
then press and hold Scan
(double beep)
12:55
DSC
T/W
M/S
SSccaann
INT
SSccaann
EEnnaa
Rx
Press and
hold
2.12 Memory Scan
Like the Scan function, Memory Scan will cycle sequentially
through the channels, but only those which have been pre-
selected.
➞
Refer to the next subsection 2.12.1 for more information on
preselecting Memory Scan channels.
12:55
DSC
T/W
MM//SS
Scan
INT
Hi
Lite
Rx
12:56
DSC
Adv
Del
INT
Hi
Lite
MM//SS
Press Adv to manually
advance to the next channel in
the Memory Scan sequence
Note While in Memory Scan mode, normal VHF functions are not
available. To exit Memory Scan mode, press C or 16.
All manuals and user guides at all-guides.com
RD68 VHF
24
E03912 Issue 2.0
2.12.1 Add/remove channels from
Memory Scan
To add a channel to the Memory Scan cycle:
12:57
DSC
T/W
M/S
Scan
Select the required
channel
INT
Hi
Lite
Rx
1. While in Memory Scan mode
2. In VHF mode
12:57
DSC
Adv
DDeell
INT
MM//SS
DDeell
M/S
12:57
DSC
T/W
MM//SS
Scan
INT
MM//SS
DDeell
Rx
Press
and hold
Select channel to be
deleted, then press and
hold M/S (double beep)
12:57
DSC
T/W
MM//SS
Scan
INT
MM//SS
SSeell
Rx
Press
and hold
Press and hold M/S
(double beep)
To delete a pre-selected channel from the Memory Scan cycle:
All manuals and user guides at all-guides.com
all-guides.com
Instruction Manual
25
E03912 Issue 2.0
2.13 Priority & User channel select
The priority channel (usually Ch16, depending on the configura-
tion of the RD68) can be accessed immediately by pressing 16.
This will cancel any function currently in operation.
The User channel is a programmable priority channel which is
accessed by pressing 16 twice:
12:57
DSC
T/W
M/S
Scan
Press 16 twice
INT
Hi
Lite
Rx
2.13.1 Programming the User channel
12:58
DSC
T/W
M/S
Scan
INT
Hi
UUsseerr
Rx
12:58
DSC
TT//WW
M/S
Scan
INT
Hi
Lite
Rx
12:58
DSC
T/W
M/S
Scan
INT
UUsseerr
SSeell
M/S
Select the required channel
Press and hold T/W
(double beep)
Press
and hold
All manuals and user guides at all-guides.com
RD68 VHF
26
E03912 Issue 2.0
2.14 Viewing the call log
The last 16 incoming DSC calls are logged by the RD68 and
can be viewed later (this function will not be displayed if no
calls have been received).
12:58
52o16N
001
o
23E
Rx
12:58
DSC
BBaacckk
Individual
Routine
From
987654321
12:59
DSC
BBaacckk
Next
All Ships
Safety
From
987654321
Rad
Call
LLoogg
Menu
12:59
DSC
Back
Next
Distress
Alert
From
987654321
12:59
DSC
Back
Next
Sinking
23
oo
47’N
001
oo
35’E
12:50 UTC
The most recent
call is shown first
Press ▼ to view any
extra information
All manuals and user guides at all-guides.com
Instruction Manual
27
E03912 Issue 2.0
3 MISCELLANEOUS FUNCTIONS
3.1 Adjusting the LCD contrast
13:00
52o16N
001
o
23E
Rx
13:00
DSC
LLCCDD
Posn
More
13:00
DSC
Rad
Call
Log
MMeennuu
Press ▲ and ▼ keys to
adjust contrast:
max = +7
min = –8
Press DSC to return to
main menu or C to cancel
52o16N
001
o
23E
Rx
Contrast
+2
Rx
All manuals and user guides at all-guides.com
RD68 VHF
28
E03912 Issue 2.0
3.2 Entering position and time manually
The boat’s position and the time (transmitted as part of a Dis-
tress Alert call) would normally be given by an interfaced GPS.
If this is not available, the information can be manually entered:
No position
available
Rx
DSC
LCD
PPoossnn
More
DSC
PPoossnn
UTC
99o99
999
o
99
88:88 UTC
Rad
Call
Log
MMeennuu
DSC
UTC
-
o
--+
---
o
--+
88:88 UTC
13:02
NN
S
52o16
---
o
--+
88:88 UTC
If no GPS information is
being received, the clock is not
shown and the display shows
“No position available”
Enter Lat and Long
using the keypad
Press N or S for
Latitude
No position
available
Rx
/continued
All manuals and user guides at all-guides.com
Instruction Manual
29
E03912 Issue 2.0
Note The display will now show the manual Lat and Long when in
DSC mode, but the clock display will not be shown (this is only
available if NMEA position and time data is being received).
Note This option will not be available if position and time data is
being received via the NMEA input.
DSC
Posn
52o16N
001
o
23E
13:02 UTC
52o16N
001
o
23E
-:-- UTC
52o16N
001
o
23
88:88 UTC
EE
W
Press E or W for Longitude
reference from meridian
Press E (Enter) key to confirm
position and select time
Enter UTC time
(24-hour format)
using keypad and
press E to confirm
DSC
Posn
UTC
52
o
16N
001
o
23E
13:02 UTC
Rad
PPoossnn
POSITION
IS OVER
4 HOURS
OLD
If this option is used, the
RD68 will request that
the position and time be
updated regularly
All manuals and user guides at all-guides.com
all-guides.com
RD68 VHF
30
E03912 Issue 2.0
3.3 Entering local time
When a GPS is connected to the RD68 via the NMEA interface,
the display will show the UTC (GMT) time in the top right-
hand corner. This can be changed to the local time if required:
52o16N
150
o
23E
Rx
DSC
LCD
Posn
MMoorree
Rad
Call
Log
MMeennuu
52o16N
150
o
23E
Rx
52o16N
150
o
23E
Rx
DSC
Beep
TTiimmee
DSC
MMSI
Dir
MMoorree
52o16N
150
o
23E
Rx
13:03
13:03
13:03
13:03
DSC
13:03
Use arrow keys to
adjust to local time and
press DSC to return to
main menu
/continued
Adjust
local time
Rx
All manuals and user guides at all-guides.com
Instruction Manual
31
E03912 Issue 2.0
3.4 Viewing the directory
The directory allows up to 16 MMSI numbers to be stored in
the RD68’s memory. These can then be recalled when making
an Individual Routine call:
52o16N
150
o
23E
Rx
Rad
Call
Log
MMeennuu
18:03
The display will now
show local time
The main directory
screen shows the num-
ber of directory entries
52o16N
150
o
23E
Rx
DSC
LCD
Posn
MMoorree
Rad
Call
Log
MMeennuu
52o16N
150
o
23E
Rx
52o16N
150
o
23E
Rx
DSC
VViieeww
Add
DSC
MMSI
DDiirr
More
Directory
Used 04/16
18:03
18:04
18:04
18:04
/continued
All manuals and user guides at all-guides.com
RD68 VHF
32
E03912 Issue 2.0
3.4.1 Adding an entry to the directory
Directory
01
Excalibur
002321167
DSC
Back
Next
Edit
DSC
NNeexxtt
Edit
Directory
02
Saucy Sue
002320588
18:04
18:04
Enter name using the keypad (10 chars max) -
Press E to confirm name -
Enter MMSI number, then
press E to save entry to directory
DSC
View
AAdddd
Directory
Used 04/16
18:05
DSC
Name:
_________
18:05
DSC
Name:
Sea Mist
MMSI:
________
18:06
All manuals and user guides at all-guides.com
Instruction Manual
33
E03912 Issue 2.0
3.4.2 Editing/deleting an entry
To edit an existing entry:
The main directory
screen shows the
number of entries
DSC
VViieeww
Add
Directory
Used 05/16
18:06
Directory
01
Excalibur
002321167
DSC
Del
DSC
Next
EEddiitt
Directory
01
Excalibur
002321167
18:06
18:06
DSC
Name:
Ba _______
MMSI:
002321167
18:06
DSC
Name:
Excalibur
MMSI:
00 ______
18:06
Re-enter the MMSI
using the keypad.
Press E to enter
Edit MMSI number
Re-enter the name
using the keypad.
Press E to enter
Edit Name
All manuals and user guides at all-guides.com
RD68 VHF
34
E03912 Issue 2.0
To delete an entry from the directory:
DSC
VViieeww
Add
Directory
Used 05/16
18:06
Directory
01
Excalibur
002321167
DSC
DDeell
DSC
Next
EEddiitt
Directory
01
Excalibur
002321167
18:07
18:07
DSC
No
YYeess
Directory
Delete ?
Excalibur
002321167
18:07
All manuals and user guides at all-guides.com
all-guides.com
Instruction Manual
35
E03912 Issue 2.0
3.5 Disabling the key beep
All key presses on the RD68 are normally confirmed by a
“beep” – this feature can be disabled:
52o16N
150
o
23E
Rx
DSC
LCD
Posn
MMoorree
Rad
Call
Log
MMeennuu
52o16N
150
o
23E
Rx
52o16N
150
o
23E
Rx
DSC
BBeeeepp
Time
DSC
MMSI
Dir
MMoorree
52o16N
150
o
23E
Rx
18:07
18:07
18:07
18:07
To re-enable the key beep, repeat the above key sequence.
Note The key beep will be disabled on all first level functions. Second
level functions which are accessed by pressing and holding a
key (e.g. setting the User channel or adding a channel to the
Memory Scan cycle) will still be audibly confirmed by a double
beep – this cannot be disabled.
All manuals and user guides at all-guides.com
RD68 VHF
36
E03912 Issue 2.0
3.6 Second country mode
In countries where it is permitted, the RD68 can operate on a
secondary set of channels, such as the USA channels:
Note Channel sets available will depend on programming. Please
enquire with your national licensing authority for details of
permitted channel sets in your country (see also section 5.4).
Note The radio will revert to the International channel set when it is
switched off.
3.7 Speaker mute (handset models only)
On radios fitted with a handset, lifting the handset from the cra-
dle will normally mute the loudspeaker. However, this can be
disabled, so that the loudspeaker will remain on when the hand-
set is lifted, and incoming transmissions will be heard both in
the handset earpiece and the loudspeaker.
Radio switched off
Turn radio on
18:07
DSC
T/W
M/S
Scan
UUSSAA
M/S
Sel
Rx
Press and hold
To restore speaker muting, repeat the above procedure.
Turn radio on
Press and
hold
Radio switched off
All manuals and user guides at all-guides.com
Instruction Manual
37
E03912 Issue 2.0
4 INSTALLATION
4.1 VHF installation
The radio should be sited so that engine noise and vibration or
other background noise do not make it difficult for the operator
to hear.
Although the RD68 radio is waterproof when flush mounted, it
is recommended that it is not installed where it will be exposed
to continuous direct sunlight, as this will eventually damage the
LCD display.
As microphones and loudspeakers contain powerful magnets,
the radio should not be installed within 1 m (3 ft 3 in) of any
compasses, whether magnetic or electronic.
The fins on the back of the case act as a heatsink to dissipate
heat generated by the set when in use, which maintains the high
efficiency of the radio. The free circulation of air is essential –
when mounting the radio in an enclosed space, ensure that the
space is vented.
The VHF is supplied with a reversible mounting bracket. This
can be used to mount the VHF on the chart table or on an over-
head bulkhead (Fig 4.1). The bracket is fixed in place using four
No. 10 x 3/4 in screws (supplied). Before installing, ensure that
there is at least 88 mm (3.5 in) vertical clearance and 100 mm
(3.9 in) horizontal clearance behind the bracket to allow the
radio to fit (Fig 4.2).
Fig 4.1 - Standard mounting options
Desktop mounting
Overhead mounting
Fig 4.2 - Minimum clearance required
100 mm (3.9 in)
88 mm (3.5 in)
All manuals and user guides at all-guides.com
RD68 VHF
38
E03912 Issue 2.0
The radio is fixed to the bracket using a simple clamp arrange-
ment. The peg on the left side of the radio is slotted into the
hole in the bracket. The clamp on the right side of the radio can
then be slid into the slotted aperture on the bracket and tight-
ened to hold the radio firmly in place (Fig 4.3). The rake angle
of the radio can be adjusted by slackening the clamp.
1. Fit locating peg (left side) into hole in bracket
2. Slide locking clamp (right) into slot in bracket
3. Tighten clamp
Fig 4.3 - Fixing the VHF to the bracket
1
2
3
An alternative mounting method is to use the flush mounting kit
(FMB1000:BK, supplied separately). This allows the radio to
be neatly installed inside a bulkhead, so that only the fascia of
the radio is visible.
➞
For more details of this and other accessories available,
please refer to section 5.6.
All manuals and user guides at all-guides.com
Instruction Manual
39
E03912 Issue 2.0
The RD68 has five electrical connections – the handset/fistmike
socket is on the front panel below the LCD display (Fig 4.4A).
The other four are situated on the back of the case: the antenna
socket is on the left (Fig 4.4B); DC power is supplied to the set
via a two-core flying lead (Fig 4.4C); the NMEA input connec-
tions (Fig 4.4D) allow a GPS to be interfaced, below which is a
3.5 mm jack socket for an optional extension speaker (Fig 4.4E)
– this is covered by a weather plug when not in use.
The VHF requires a 12V DC supply to operate and is supplied
with a power lead which incorporates an in-line 7.5 Amp fuse.
This lead should be connected to the vessel’s power supply,
keeping the cable runs as short as possible. Although the radio
draws very little current when receiving, a heavier current is
drawn when transmitting, which may result in a voltage drop if
long cable runs of inadequate core diameter are used. If the sup-
plied power lead is not long enough, an extension of up to 3 m
(10 ft) can be made using at least 2.5 mm
2
(13 AWG) wire.
The red wire is positive and black is negative. If polarity is
accidentally reversed, the set is protected, but the fuse will blow.
Ensure that it is replaced with a fuse of the correct 7.5Amp rat-
ing. The radio is designed to be easily removable for storage or
security, so leave an adequate length of cable to ease disconnec-
tion. The flying lead from the rear of the radio can then be
plugged into the power supply lead. Note, that the configuration
of the plug prevents incorrect connection.
A - Handset / Fistmike
B - Antenna
C - 12V DC
E - Extension
speaker
Fig 4.4 - External connections
D - NMEA
All manuals and user guides at all-guides.com
all-guides.com
RD68 VHF
40
E03912 Issue 2.0
The antenna is connected to the radio using a standard PL259-
type connector as fitted to most marine antennas. If fitting to an
existing antenna, check that the contacts are not corroded before
connecting, as this will affect the quality of the signal. Ensure
that the retaining collar of the antenna plug is securely tightened
to prevent accidental disconnection.
For NMEA interfacing to an external navigation source (e.g. a
GPS, Loran or chartplotter) the RD68 is supplied with a 1 m
cable assembly which plugs into the lead at the back of the
radio. The other end is connected to the navigator as follows:
Wire color Navigator connections:
Red NMEA OUT Data (+)
Blue NMEA OUT Common (-)
Fig 4.5 - Linking to navigation source
Red -
Data Out
Blue -
Common
Note If the navigator does not have a dedicated NMEA common ter-
minal, the blue wire should be connected to the 0 V terminal of
the navigator.
The extension speaker socket takes a standard 3.5 mm jack plug.
The speaker used must have a minimum impedance of 8Ω.
4.2 Antenna installation
The most important factor in the performance of the radio will
be the quality and positioning of the antenna. Most recorded
problems with VHF radios are related to poor antenna siting,
faulty cabling, poor quality cable joints, and low voltage supply.
Even a VHF as highly advanced as the RD68 cannot compen-
sate for these factors. Therefore, when replacing an existing
VHF installation, it is important that the antenna is thoroughly
checked for any faults or damage before use.
As the range of VHF signals are governed by line of sight (see
section 5.3), the antenna should be placed as high as possible,
while remaining clear of any metallic objects that could influ-
ence the resonance of the antenna.
All manuals and user guides at all-guides.com
Instruction Manual
41
E03912 Issue 2.0
The most popular antennas for marine use are 1 m (3 ft 3 in)
long. On sailboats these are usually mounted on the masthead,
where the length of the antenna keeps it clear from the naviga-
tion lights and windvanes, etc. This type of antenna can also be
mounted on the cockpit roof or garage of power boats.
Longer whip antennas are recommended for larger boats – these
radiate the same total power as smaller antennas, but concen-
trate it into a narrower beam, which is advantageous on a tall
mast at extreme range where concentrating the available power
into a narrow horizontal beam becomes more important.
However, if the antenna is not vertical when transmitting, the
beam will be angled either too high or too low (Fig 4.6).
Fig 4.7 - Effect of heel on range of 1 m marine antennas
Fig 4.6 - Effect of heel on range of longer whip antennas
Here the wider beam of the shorter antenna will be more uni-
versally effective, although the signal will be weaker (Fig 4.7).
Therefore, for vessels with a large heel angle (small sailboats) a
short masthead antenna would be a better choice. Your local
agent should be able to provide specific advice on antenna
choice for the vessel it is to be fitted to.
WARNING The antenna coaxial cable and any connectors
used must be rated at 50 Ω. Under no circum-
stances should standard domestic TV cable and
connectors be used. Incorrectly rated cabling and
connectors could result in power not reaching the
antenna, but power could also be reflected back
into the radio, damaging it in the process.
All manuals and user guides at all-guides.com
RD68 VHF
42
E03912 Issue 2.0
The quality of any connections and integrity of the cable (with-
out breaks in the sheathing) will directly affect the performance
of the radio. Poor soldering or corrosion of the terminals can im-
pair performance. We recommend that screw or crimp terminal-
type connectors are not used for any through-deck fittings – a
good quality waterproof solder terminal connector will be less
susceptible to poor connection due to corrosion of the contacts.
Note If the RD68 detects a problem with the antenna or antenna con-
nections, the display will show ANT when the PTT key is press-
ed. To avoid possible damage to the radio the antenna should
be checked immediately for any damage or poor connection.
4.3 Electrical interference suppression
Interference generated by the alternator of the engine may occa-
sionally cause problems. The RD68 has been designed to mini-
mize the effects of outside interference. However, precautions
should still be taken – route the power supply and antenna
cables away from the engine compartment. The cable run should
not be down the same trunking as other cables carrying high
current. The antenna cable should also be kept separate from the
radio’s power cable.
Engines with spark ignition—and also some refrigerators—
should be fitted with suppressors. Your local agent should be
able to give advice on this, and also supply suppression kits
where necessary.
All manuals and user guides at all-guides.com
Instruction Manual
43
E03912 Issue 2.0
5 APPENDIX
5.1 Operating procedures
The following operating procedure summary has been proposed
by the UK Maritime and Coastguard Agency. It is not exhaus-
tive and should not be regarded as a replacement for informa-
tion provided by the proper two-day VHF/DSC training course
required for all UK VHF license holders.
5.1.1 Sending a Distress Alert
1. Send a Distress Alert call (see section 2.7).
2. Wait approx. 15 seconds for a DSC acknowledgment from
the Coastguard or a ship station.
3. On receipt of a DSC acknowledgment, or after about 15
seconds, transmit the following distress call on channel 16:
“Mayday, Mayday, Mayday”
“This is (name of vessel, repeat three times)”
“Mayday (MMSI number and name of vessel or callsign –
Position – Nature of distress – No. of persons on board)”
“I require immediate assistance”
“Over.”
If the vessel is not in grave and imminent danger, an All Ships
Urgency call followed by a spoken “Pan Pan” or a routine call
to the nearest Coastguard station may be more appropriate.
WARNING It is a prosecutable offense to initiate a Distress
Alert call for any other reason than that the ves-
sel and/or crew is in grave and imminent danger.
5.1.2 Acknowledging and relaying a
Distress Alert
When a DSC Distress Alert is received, an audible alarm will
sound. Immediately cease any transmission that may interfere
with distress traffic and continue a watch on channel 16.
If there is no DSC acknowledgment from a coast station or ship,
after a short interval acknowledge by voice on channel 16:
“Mayday (MMSI of vessel in distress, repeat three times)”
“This is (name of own vessel, repeat three times)”
“Received Mayday (state the assistance you can give)”
“Over.”
A similar response should be given to a distress relay, using the
words “Mayday Relay” instead of “Mayday”.
All manuals and user guides at all-guides.com
RD68 VHF
44
E03912 Issue 2.0
5.1.3 Cancelling a Distress Alert
If a DSC Distress Alert is sent accidentally, cancel it immediate-
ly on the RD68 by pressing the C button to prevent repeats, then
make the following announcement on channel 16:
“This is (name of vessel, callsign, MMSI)”
“Cancel DSC Alert sent (date & time UTC)”
“Over.”
DO NOT simply cancel the DSC alert without verbally cancel-
ing it as well, otherwise the rescue authorities will not be aware
that this is a false alarm.
5.1.4 Alerting all vessels within range
If the vessel is outside of coast radio range and needs to issue a
safety warning to all vessels within radio range, transmit an All
Ships Safety call by DSC. After about 15 seconds transmit on
channel 16 the safety call and message as follows:
“Securité, Securité, Securité”
“All stations (or called station – repeat three times)”
“This is (MMSI and name or callsign of own vessel –
repeat text of safety message) – Over.”
5.1.5 Calling a coast radio station
Enter the MMSI of the station into the RD68, either manually,
or from the directory. When the call is acknowledged, the work-
ing channel for voice communication will be indicated and the
RD68 will automatically switch to that channel. Make a voice
call as normal.
5.1.6 Making an intership call
Enter the vessel’s MMSI into the RD68, either manually, or
from the directory. Before sending the call, enter the intership
channel to be used for subsequent communication. When the
alarm sounds on the called vessel, its operator should acknowl-
edge by DSC, then respond by voice on the selected channel.
If the MMSI number of the vessel is not known, call as now on
channel 16. If no response is received, call on channel 13 (this
is the GMDSS bridge-to-bridge communication channel).
5.2 NMEA sentences received
The following NMEA0183 sentences are processed by the
RD68 in order to transmit the boat’s position when a Distress
Alert is initiated:
NMEA version 2.0 – GGA, GLL, RMC.
All manuals and user guides at all-guides.com
all-guides.com
Instruction Manual
45
E03912 Issue 2.0
5.3 Transmission range
Because VHF signals travel in a straight line and are not reflect-
ed back off the ionosphere as lower frequency signals are, the
range of VHF signals is limited to ‘line of sight’, beyond which
other vessels pass behind the curve of the Earth.
Therefore, the range will increase greatly the higher above sea
level the antenna is positioned, as Fig 5.1 illustrates (assuming
maximum transmission power is used):
The typical ship-to-ship range of a fixed VHF radio, such as the
RD68, with a masthead antenna will be approximately 20 km
(12 miles). This will increase as height above sea level increas-
es, or if the other radio user’s antenna is at a greater height –
note, that the range between the yacht with the antenna mounted
on a 9 m (30 ft) mast and the shore station increases to 46–53 km
(29–33 miles).
Fig 5.1 - VHF transmission range
All manuals and user guides at all-guides.com
RD68 VHF
46
E03912 Issue 2.0
5.4 Channel frequencies
Note Ch 0 will only be made available in the UK to Coastguard
users with written authorization.
Channel 70 is the designated Digital Selective Calling (DSC)
channel and may not be used for voice transmissions.
All manuals and user guides at all-guides.com
Instruction Manual
47
E03912 Issue 2.0
5.5 Troubleshooting
Symptom Possible Cause Remedy
Unit will not switch on * Faulty connection to power * Check power connection
* Fuse has blown * Replace fuse and check
power supply current
Scan or Memory Scan is * Noise on the channel is holding * Increase squelch level
locking on a channel the scan * Inhibit channel from scan
without a signal (see section 2.11.1)
Dual Watch not being * Priority channel selected * Select a working channel
entered * Handset off cradle * Replace handset
Cannot change channel * Dual Watch (D/W) engaged * Exit Dual Watch
Certain channels are * Some channels are restricted * Consult your national
not obtainable and not programmed depending authority for permitted
on country of purchase channels in your region
Will not transmit * Scanning or D/W function active * Exit D/W or Scan
Will not transmit on 25W * Low voltage when full transmit- * Check power supply
but OK on 1W ting current is drawn
* Some channels are restricted to * Consult your national
low power transmission only authority
Transmissions persistently * Damaged antenna * Replace antenna
weak /display flashes * Antenna cable broken * Replace cable
ANT * Poor contact * Check antenna sockets &
through-deck connector
These simple checks should be carried out before seeking tech-
nical assistance and may save time and expense. Before con-
tacting your servicing agent, please obtain the radio’s serial
number. The software iteration should also be quoted – this is
shown in the large digits on the display for 2 seconds after the
radio is turned on and should be written in the box below for
future reference.
RADIO SERIAL No. SOFTWARE ITERATION
All manuals and user guides at all-guides.com
RD68 VHF
48
E03912 Issue 2.0
5.6 Accessories
The following accessories are available from your Simrad
Technical Dealer. Please quote the relevant part number when
ordering.
THS5
Spare telephone handset
FTM5
Spare fistmike
LS60
Waterproof loudspeaker
FMB1000:BK
Flush Mount Kit
5.7 Technical specifications
Power supply . . . . . . . . . . . . . . . . . . . 12 V DC (10.8 V–15.5 V DC)
Channel capability . . . . . . . . . . . . . . . . . . . 55 international channels
. . . . . . . . . . . . . . . . . . . . . . . . 1–28, 60–88 simplex & semi-duplex
. . . . . . . . . . . . . . . . . . . . . UK: includes M (previously 37) and M2
. . . . . . . . . . USA: includes 0, 29, 89, 75, 76, Wx1–10 receive only.
. . . . . . . . . . Scandinavia: leisure or fishing channels as appropriate.
. . . . . . . . . . . . . . . . . . . . . . . Canada: Canadian and USA channels.
Private channels . . . . . . . . . . . . . . . . . . . Up to 16 private channels*
External speaker impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8Ω
*Contact your local Simrad Technical Dealer for further details.
Transmit
Frequency range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155–163 MHz
Power output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Watt or 25 Watts
Current consumption . . . . . . . . . . . . . 5.5A (25 Watts), 1.3A (1Watt)
Harmonic and spurious emissions . . . . . . . . . . . . . . . . . . < 0.25 µW
Hum/noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -40 dB
Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5 kHz
Receive
Audio output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Watts
Current consumption . . . . . . 600 mA (Full volume, illumination on)
. . . . . . . . . . . . . . . . . . . 220 mA (Fully squelched, illumination off)
Sensitivity . . . . . . . . . . . . . . . . . . . . < 0.5 µV emf for 20 dB SINAD
Harmonic and spurious emissions . . . . . . . . . . . . . . . . . . . . < -2 nW
Hum/noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -40 dB
Adjacent channel selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
Intermodulation rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB
Environmental
VHF Radio . . . . . . . . . . . . . Waterproof to IP66 when flush mounted
Fistmike/telephone handset . . . . . . . . . . . . . . . . . Waterproof to IP67
All manuals and user guides at all-guides.com
Instruction Manual
49
E03912 Issue 2.0
5.8 Dimensions
185 mm (7.4 in)
158 mm (6.2 in)
66 mm (2.6 in)
22 mm (0.9 in)
47 mm (1.8 in)
55mm (2.2 in)
79 mm (3.1 in)
213 mm (8.4 in)
54 mm (2.2 in)
70 mm (2.8 in)
All manuals and user guides at all-guides.com
all-guides.com
Loading...