uniden'
MC 724 - 90 CHANNEL
MARINE RADIOTELEPHONE
OWNER’S MANUAL
UNIDEIM MC 724
The UNIDEN MC 724 VHP marine radio transceiver has been designed to give you a
rugged reliable instrument that will provide you with years of trouble-free service.
You are encouraged to thoroughly read this manual to acquaint yourself with the
characteristics and operation of your transceiver so that you can contribute to the
longevity of your investment.
With proper care and maintenance, your UNIDEN MC 724 will outlast your present
vessel and serve you well on board several more. The full features and flexibility
lesigned into this quality transceiver will prevent it from becoming obsolete regardloss of changes in craft or geographic locations. The unit may be mounted in any
number of convenient locations by utilizing the universal mounting bracket. All
legally available Australia, and international channels are provided. The technical
excellence of the UNIDEN MC 724 is demonstrated by the multiplicity of uses for
which it has been found acceptable by the Department of Communications.
The UNIDEN MC 724 is of all solid state design with conservatively rated rugged
components and materials compatible with the marine environment. The transceiver
utilizes gaskets, sealing rings, waterproof membranes and other sealants to effect a
-.plashproof housing for protection of the electronics.
- 1 -
IIViSTALLATfON
CAUTION: The IVIC 724 will operate only with a nominal 12 volt negative
ground battery system.
CHOOSING A LOCATION
1. Select a location that is free from spray and splash.
2. Select a location that minimizes exposure to direct sunlight {including that com
ing through windows).
3. Select a location that allows free air flow around the heatsink on the rear of the
radio,
4. Select a location well away from the ship's compass. Auxiliary speakers also
should be located away from the compass.
5. Select a location as close to the battery as possible (in order to keep battery leads
as short as possible). Direct connection to the battery is most desirable. If direct
connection cannot be made with the supplied power lead, any extension should
be made with at least #10 AWG wire.
ENGINE NOISE SUPPRESSION
Interference from the impulse noise generated by the electrical systems of engines is
sometimes a problem with radios. The MC 724 has been designed to be immune to
ignition impulse noise and alternator noise. However, in some installations it may be
necessary to take measures to further reduce the effect of noise interference. All DC
battery wires, antenna leads and accessory cables should be routed away from the
engine and engine compartments and from power cabling carrying particularly high
currents. ;
In severe cases of impulse noise interference, it may be necessary to install a noise
suppression kit that is available from your UNIDEN Dealer.
ANTENNA CONSIDERATIONS
1, Keep the antenna lead as short as possible. Long antenna leads can cause substan
cial loss of performance for both receiving and transmitting.
2. Locate your antenna as high as possible and clear from metal objects. The reliable
range of coverage is a direct function of antenna height. The general rules for
antennas are: The more gain the greater the range and, the higher above the water
line the greater the ranger.
MOUNTING CONSIDERATIONS
Keep in mind the flexibility designed into the MC 724 so that you can most con
veniently use your radio. The points which should be considered are:
1, Universal mounting bracket may be installed on either top or bottom for shelf
bulkhead, or overhead mounting,
'2. The microphone connector faces forward allowing convenient in-dash or "built-
in" installations.
- 2 -
3. The front pane) can be fully reversed to provide for optimum viewing area, operat
ing for any mounting position. [See page 7 ),
4. The EXTERNAL speaker jack may be used with an auxiliary speaker in lieu of the
built-in speaker.
5. All connections are "pIng-in" type for easy removal of the radio.
ACTUAL INSTALLATION
After carefuDy considering the various factors affecting choice of location, position
the radio (with bracket, microphone, power plug, antenna plug and any auxiliary
[)lugs installed) into the selected location to assure there is no interference with
surrounding items. Mark the location of the mounting bracket. Remove the bracket
from the radio and use it as a template to mark the holes to be drilled for the mount
ing hardware. Drill the holes and mount the bracket with hardware compatible with
the material of the mounting surface. Install the power cable (red is -f, black is
antenna and all other auxiliary cables and accessories. Install the radio into the
mounting bracket and connect all cables and accessories to the appropriate jacks and
connectors.
REAR PANEL CONNECTORS
(D (D @ ® ®
1. EXTERNAL SPEAKER CONNECTOR-lf it is desired to use a speaker other than
the one in the radio, a four or eight ohm speaker ecjuipped with a miniature phone
plug may be connected to this jack. The internal speaker is disabled when an.,
external speaker is used,
2. INTERCOM CONNECTOR-When using the intercom feature, a four or eight ohm
speaker with a miniature phone plug should be connected to this jack. Refer to the
section for intercom operation.
- 3 -
3. HAIL CONNECTOR--The speaker used for the hail function is plugged into this
jack. The speaker may be either four or eight ohms impedance and should be
suitable for the environment in which it is located. The plug must be a miniature
phone plug.
DC POWER CONNECTOR-Battery connections are to be made with the cable
4.
supplied to mate with this connector. Remember, red is +, black is -I The power
cord is equipped with a fuse to protect the radio. Use only a six (6) AMPERE fast
blow fuse for replacement. Wire directly to battery for best result.
ANTENNA CONNECTOB-This connector is for connection of the antenna. A
5.
type PL259 connector is required to make proper connection.
6. MEMORY SWITCH-When this switch is "ON", the microprocessor is continuous
ly energized. This retains the scan memory and programmed priority channel. The
small amount of battery drain (3mA) caused by the continuous "ON" state of the
switch is insignificant and will not cause a battery drain problem. CAUTION! If
power is supplied through the ignition switch, the memory can be lost regardless
of the position of the switch.
FRONT PANEL CONTROLS AND LCD DISPLAY
1. LIQUID CRYSTAL DISPLAY (LCD)-Provides indication of channel and
functions even in brightest sunlight,
2. MICROPHONE CONNECTOR-Receptacle for microphone connection. When
microphone is keyed, LCD displays "TX."
3. ON/OFF-VOLUME -Turns power on to radio and allows adjustment to the
desired listening level with clockwise rotation.
4. SQUELCH-Used to quiet background noise when no signal is being received.
Proper adjustment is such that the control is advanced only slightly beyond the
point where the background noise is quieted.
- 4 -
5, KEYBOARD CHANNEL SELECTOB-Selects the desired channel. LCD display
shows CH-1 through CH-88. For channels 1 through 9, first you must depress "0"
then the desired channel number. If you atternpt to enter channels 29, 75, 76 or
89, the letter "E" will flash in the LCD display. To continue normal use of the
radio, make a proper channel selection.
6, HAILER/INTERCOM PUSHBUTTON- Disables the transmitter and allows use
of an optional hailer speaker or intercom speaker (both sold separately). Jacks
clearly labeled “HAIL" and "INTERCOM" are provided on the unit's rear panel
for easy connection. To operate the hail function, first push the "HAIL” push
button, { "HAIL" will appear on the LCD display). Next speak into the
microphone while adjusting the VOLUME control. To operate the intercom
function, first push the "HAIL" pushbutton. ("HAIL" will appear on the LCD
display.) Next speak into the microphone and you will be heard through the
intercom speaker. Also persons talking into the intercom speaker will be heard
through the radio speaker. To return to transceiver operation from either the
Hail or Intercom mode, simply depress the "HAIL" pushbutton a second time.
7, INTL/USA SELECTOR-Provides for USA frequency/channel system or for
International channels. LCD displays "USA" or "INTL."
8, 1W/25W SELECTOR-Controls transmitter output power. The 1W (Watt)
position should always be used for in-port or short range communications. LCD
displays either "1W" or "25W."
9, DIM CONTROL--This control is used to adjust the brightness of the LCD and
the keyboard backlighting for night operation.
10. CHANNEL 16 PUSHBUTTON -Provides instant Channel 16 selection, overrid
ing the CHANNEL SELECTOR.
11. WATCH PUSHBUTTON (DUAL WATCH FEATURE)--Provides for automatic
monitoring of Channel 16. Push "WATCH" and LCD displays "WATCH" and
Channel 16 to show that the priority channel is Channel 16 and that the watch is
set. Now select any other legal channel and every 2 seconds the receiver will
leave the main channel and sample activity on Channel 16. If activity is found,
receiver wilt remain on Channel 16 until message is complete. Channel 16 thus
has priority over the main channel. To disable the watch function, push
"WATCH" again.
An important feature of the MC 724 is the operator's ability to change the
watch channel to any legal channel. To do this, first go to the channel desired
using the channel selector switch. Now push "WATCH PROGRAM" key.
Channel number in display will blink. Now push "WATCH". Watch is now set
and LCD display shows new priority (watch) channel.
12. SCAN FEATURE--Any number of Marine channels can be scanned by the
MC 724. First they must be entered into the memory using the "ENTER" key.
To do this, first select a channel using the channel selector and then push
"ENTER." A small horizontal bar will appear above the LCD channel display
indicating that channel is now in memory. Repeat this until all desired channels
have been entered. Now push "SCAN," The LCD display will show the scanning
action by successively lighting segments of the unit's digit. The channels selected
- 5-
will be scanned for activity at the rate of about 9 channels per second. When
conversation is found, the scanner stops and the message is received — then
scanning is resumed. Note that if "SCAN" is pushed and no channels are in
memory, "o" is shown in the LCD display to indicate that condition. The
"DELETE" key is used to reverse the process. Channels in the memory can be
removed by pushing "DELETE." When a channel is deleted, the next numerical
channel that is in the memory is displayed. If this is a channel that is also to be
deleted, then push "DELETE" again. This action can be repeated until the
memory is empty once more and "o" appears in the LCD display to indicate
there are no chaonels to scan.
The "MANUAL" key is used to stop the scanning action. It also has two other
important functions; to return to a prior channel, and to review those channels
in the memory. When "MANUAL" is pushed, the receiver first returns to
whatever channel was being monitored prior to "SCAN." Subsequent pushes on
"MANUAL" key advance the receiver through the memory channels.
If the receiver is scanning the memory channels and a message is received, the
receiver will stop and monitor this channel. If the operator would like to remain
on this channel, then either the microphone push-to-talk or the "MANUAL"
button should be depressed. The radio wiM Immediately go to manual on that
channel.
During scan, the transmitter is disabled when the receiver is not stopped on a
channel.
13. WEATHER PUSHBUTTON-Allows for direct access to any 1 of the 9 weather
channels. Depress this button, then depress any of the keyboard pushbuttons 1
through 9 to receive desired weather channel. The small "WX" indicator will
appear in the LCD Display just under the channel number (indicating weather
channel),
14. WEATHER SCAN PUSHBUTTON-Allows for automatic continuous scanning of
all 9 weather channels. Depress this button and the LCD display will show the
scanning action by successively lighting segments of the unit’s digit. The rate of
scanning is about 9 channels per second. Small "WX" indicator will appear in
LCD display (indicating weather scan). Radio will automatically lock in on the
first weather transmission available. Push WEATHER SCAN PUSHBUTTON
again and radio wilt scan to the next active weather channel.
15. COAST GUARD SCAN PUSHBUTTON-Allows for automatic continuous
scanning of all Coast Guard (USCG) channels. Works in same way as weather
scan. Small "USCG" indicator will appear in LCD display indicating Coast Guard
scan. After transmission is terminated, scanning continues.
16. TELEPHONE SCAN PUSHBUTTON-Allows for automatic continuous scanning
of all telephone channels. Works in same way as weather scan. Small telephone
handset symbol will appear in LCD display indicating telephone scan. After
transmission is terminated, scanning continues.
17. FISH SCAN PUSHBUTTON-Allows for automatic continuous scanning of some
channels commonly used for fishing. Works in same way as weather scan. Small
"Fish" indicator will appear in LCD display indicating fish scan. After trans
mission is terminated, scanning continues.
-6
REVERSING THE FRONT PANEL
dot TURN RADIO OVER AND RECONNECT SPEAKER WIRE LEADS.
UK REPOSITION SPEAKER CABINET ON TOP OF RADIO AND REPLACE FOUR
SCREWS TO SECURE THE HOUSING.
U2) RETIGHTEN FOUR APPEARANCE COVER SCREWS,
-7 ~
GENERAL
Channels
Frequency Control Method
Antenna Impedance
Speaker (Internal!
Microphone
Channel Display
DOC Approvals
Frequency Stability
Operating Temperature Range
Shock and Vibration
Dime niions
Weight
Controls
Selector Switches
Program Switches
Connectors
Frequency Range
Lights and Indicators
Standard Accessories
Supply Voltage
Standby Drain
Transmit Drain
TRANSMITTER
Power Output
Modulation
Hum and Noise Attenuation
Audio Distortion
Spurious Emissions
Output Transistor Protection
Output Power Stabilization
SPECIFICATIONS
L Transmit 55, Receive-90
PLL synehtsiaer and microprocessor
50 ohms, nominal
2.35 inch, 8 ohms
Rugged 600 ohm dynamic element with coiled cord and plug-in connector
LCD alpha numeric readout.
Type approval under Australia Department of Communications
±0.0005%
-20“Cto ±50°C
Meets or exceeds EIA standards
7-l/4”W(185mml x 9-7/8”L(250mm) x 2-174"H (58mm)
4,5 pounds
On-off/volume, squelch and dimmer controls
1W/25W, intl/USA, instant ch 16. watch, hail, scan, manual channel
selector and memory backup
: Watch program, enter and delete
: Antenna, microphone, external speaker, DC power, hail, intercom,
1 156 to 1 58 MHz transmit, 156 to 163 MHz receive
r Channel number and scan list status, TX, WX, WATCH, scan, hail, USA,
international, 25W, IW and back lighted key board,
: Plug-in microphone, mounting bracket and hardware. DC power cord,
mike hanger, spare fuse, owner's manual, warranty card
: 13.8V DC negative ground
: 1,2A at rated audio output — 0.6A squelched
: 4.5A at 25W output - 1A at 1W output
25 Of 1 watt (switch selectable)
FM, ±5 kHz deviation (FCC designator 16F3)
45 dB
Less than 5%
-70dS
Built-in
Built-in automatic level control lALC)
RECEIVER
Sensitivity
20 dS quieting
12 dS sinad
Squelch Sensitivity (ElAJ
Spurious and Image Rejection
International Rejection
Selectivity (EIA)
Audio Output Power @ 10%
Dist with 4 ohm speaker
IF Frequencies
Hum and Noise Level (EIA)
-117 dBm
-114 dBm
0.20 pV
: 75dB
: 70dB@i 0.3 pV
; 50dB @>30pV
: 35dB @300pV
: 70 dB
: 3.5 watts minimum
: lst-21.4MHz, 2nd-455kHz
: 50 dB
- 8 -
CHANNEL
DESIG
WX2
WX3
WX4
WX5
WX6
WX7 -
WX8
WX9
01 156.050
02 156.100
03 156.150
04
05 156.250
06
~ггг
ж
as
JC. 156.500
11
Ti 156.600
ж
16 156.800
±L
18 156.900
19
20 157.000
21
22 157.100
23
24
25
26
27
28
60 156.025
61
62 156.125
БЗ
64
65
66 156 325
67
"Se
JS.
Ж
72
~1T
■74
jj.
7Ё 156.925
79
30
81 157.075
82
82
84
85
36
87
88
VHF FM MARiINfE RADIOTELEPHONE
CHANNELS AND FUNCTIONS
(INTERNATIONAL CHANNEL)
FREQUENCYiMHz}
SHORE
-
-
-
-
-
-
-
156.200
156.300 156.300 Safety Yes
156.350
156 400 156.400 Com3
156.450
156.550
1 56.650
156,700
156.750
156 850 156.850
156.950
157.050 161,650
157.150 161.750
157.200
157.250 161.850 Public Corresp, No ■ Yes
157.300
157.350
157.400 162.000 Public Corresp, No Yes Susy Tel.
156.075 160.675
156.175 160.775
156.225
156.275 160,875 Port Ops
156.375 156.375 Com'l Yes No
156.425
156.475
156.525 156,525 Non Com3 Yes No Fish
156.575
156.625 156,625 Non Com'l Yes No Fish
156.675
156.725
156.875 156.875 Port Ops
156.976 161.575 Com'l Yes Yes
157.025
157.125
157.175 161.775 Coast Guard
157.225
157.275 161,875 Public Corresp.
157.325
157.375
157,425 162.025
162,550
162,400 NOAA Weather
162.475 NOAA Weather
162,425
162 450 NOAA Weather
162,500
162.525
161.550 Can. Weather
161.775 Can. Weather
160.650 VTS
160.700
160.750 Port Ops
150.800 Port Ops
160.850
160.950
156.450 Com3 Si Non Com3 Yes Yes Fish
156.500
156.550 Com3 Yis Yes
156.600 .
156.650 Navigati ori el
156.700 Port Ops Yes Yes
156.750 Environ men tal Yes Environmental
156.800 Safety CaMing
161.500
161,550
161.600
161.700 Coast Guard
161.800 Public Corresp. No, Yes Busy Tel.
161.900 Public Corresp.
161.950 Public Corresp,
160.625
160.725
160.825
160,925 Port Ops
156,425
156.475 Non Com3
156.575
156.675
156.725
161.525
161,625
161.675
161,725
161.825
161.925
161.975
TYPE
TRAFFIC
NOAA Wcaihcr
NOAA Weather
NOAA Weather
NOAA Weather RX Only
Port Ops
VTS
Com'l
Com3 Yes
Port Ops
State Control
Com3
Com3 Yes Yes
Port Ops
Coast Goard
Coast Guard
Non Com3 Yes Yes Fish
SHIP
TO SHIP
RX Only
RX Only
RX Only
RX Only
RX Only
RX Only
RX Only
RX Only
Yes
Yes
Yes
Yes
Yes Yes
Yes Yes
Yes No
TO SHORE
RX Only Weather
RX Only
RX Only
RX Only Weather
RX Only
RX Only
RX Only
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes Yes
Yes
Yes
Yes Yes
Yes Yes
No Yci
No
Yes
Yes Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes Susy Tel.
Yes
Yes
SHIP
RX Only Weather
RX Only
permanent
SCAN LISTSHIP
Weather
Weather
Weather
Weather
Weather
'Weather
Susy Tel.
Busy Tel.
Fish
Non Com3 Yes Yes Fish
Port Ops Yes Yes
Pori Ops
Non Com3
Com'l
Coast Guard
US Gov Only
Public Corresp. No Yes Busy Tel.
Public Corresp.
Public Corresp,
Com3 Yes No
Yes Yes
Yes
Yes Yes
Yes
Yes Yes Coast Guard
Yes Yes
Yes Yes
No
No Yes Busy Tel.
No Yes Busy Tel,
No
Yes
Coast Guard
Yes Busy Tel.
Busy Tel.
- 9
CARE AND MAINTENANCE
Your MC 724 is a precision piece of electronic equipment and you should treat it
accordingly. Due to the rugged design, very little maintenance is required, however, a
few precautions should be observed.
If your radio has been accidentally subjected to spray or splash, you should im
mediately wipe it down with a soft cloth dampened with fresh water.
If the antenna has been damaged, you should not transmit except in the case of
emergency. A defective antenna may cause damage to your radio.
You arc responsible for the continued FCC technical compliance of your radio.
You are urged to arrange for periodic performance checks with your UNIDEN
Marine Dealer.
SERVICE
Should you find it desirable or necessary to have service performed on your MC 724,
you are urged to contact the UNIDEN Dealer from whom you made your purchase.
He, or any other UNIDEN dealer is able to provide you with complete service
performed by well qualified personnel.
If you require service that is within the terms of your warranty, you should present
the validated WARRANTY CARD to your dealer to authenticate your claim. Your
WARRANTY CARD is your passport to easy service. This card is to be completed by
your dealer at the time of purchase. Other suitable documents which clearly establish
ownership and date of purchase may be used in lieu of the WARRANTY CARD.
If you find it inconvenient to have service performed by your local UNIDEN Marine
Dealer, you may also obtain service from the Eactory Service Station. If you require
factory service, please pack your radio in a suitable container which wifi provide
adequate protection, enclose a note describing the problem, and a copy of your
validated WARRANTY CARD, or other proof-of-purchase documents and return
(transportation prepaid) to:
Santronic Agencies Pty, Ltd.
13 Garema Circuit, Kingsgrove
Phone 758 1522
P.O. Box 12, Kingsgrove, NSW 2208
If the service you require is not within the terms of the warranty, you should specifi
cally include written authorization to proceed with service and to agree to appro
priate charges.
- 10 -
uniden
12 MONTHS FULL WARRANTY
WARRANTOR. SANTRONIC AGENCIES PTY. LTD. 13 Garema Circuit,
Kirgsgrove MSW 2208 r^SANTRONIC"!.
ELEMENTS OF WARRANTY. SANTRONIC warrants, for the duration of this
warranty,, its UNfDEN Marine Product to t>e free from defects in materials and
craftsmanship with only the limitation or exclusions set out below.
WARRANTY DURATION, This Warranty shall terminate and be of no further effect
One i1) year after the date of original purchase of the Product or at the time the
Product is la) damaged or not maintained as reasonable and necessary, (b) modified,
id improperly installed, (d) is repaired by someone other Warrantor for a defect or
rnalfkinction covered by this Warranty, or {ej used in a manner or purpose for which
the Product was not mtended.
PARTS COVERED, This Warranty covers all components of the Products,
STATEMENT OF REMEDY. In the event that the Product does not conform to this
Warranty at any time while this Warranty is effective. Warrantor will repair the defect
and return It to you prepaid, without charge for parts, service, or any other costs
incurred by Warrantor or its representatives in connection with the performance of
this Warranty. In addition, if the Product contains a defect or malfunction which is
not repaired after a reasonable number of attempts by Warrantor to repair the
Product, the Product or defective component will at our discretion, wiJI be replace
without charge, when the defective product is delivered to the warrantor at 13
Garema Circuit Kingsgrove NSW 2206 free and dear of aM liens and encumbrances,
please note that while the Product will be remedied under this Warranty without
charge. THIS WARRANTY DOES NOT COVER OR PROVIDE FOR THE REIM
BURSEMENT OR PAYMENT OF INCIDENTAL OR CONSEQUENTIAL
DAMAGES,
Some states do not allow this exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you.
PROCEDURE^ FOR OBTAINING PERFORMANCE OF WARRANTY. Ir the event
that the Product does not conform to this Warranty, the Product should be shipped
prepaid to Warrantor at 13 Garema Circuits Kingsgrove NSW 220S* THE ORIGINAL
OR COPY OF THE SALES RECEIPT OR OTHER VALID EVIDENCE OF THE
DATE OF THE ORIGINAL PURCHASE MUST ACCOMPANY THIS PRODUCT.
LEGAL REMEDIES. This Warranty gives ycxj specific legal rights, and you may also
have other rights which vary from state to state.
UTSN01774DZ
Sanironic )
AGENCIES PTY. LTD,
13 GAREMA CIRCUIT, KINGSGROVE
PHONE 758 1522, TELEX AA73170
P.O, Box 12, Kingsgrove, NSW 220B
BRISBANE: 3/12 RANDALL ST
SLACKS CREEK, OLD 4127
PHONE 07 290 1188
©Copyright 1984 Uniden Corporation Printed in Taiwan
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