Uniden MC 724 User Manual
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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.
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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.
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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.
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