Uniden MC-4300 User Manual

uniden'

10 Channel
Marine Transceiver

MC-4300

with 2 Weather Channels

OWNERS MANUAL

DESCRIPTION

Your MC4300 represents the most advanced Mobile Station type radio ever designed
for use in the Inshore Boating Radio Communications Service, combined with unique
features for use on a boat, it will operate on any of the 10 frequencies designated as
citizens band channels by the Department of Communication. Your Model MC4300
features a frequency synthesizing circuit with PHASE LOCK LOOP techniques to
assure ultraprecise frequency control. This radio has been Type Accepted approved
by the D.O.C,

WARNING

The Inshore Boating Radio Communications Service is under the jurisdiction of the
Department of Communication (D.O.C.). Any adjustments or alterations which
would after the performance of the transceiver’s original D.O.C. Type Approval or
which would change the frequency determining method are strictly prohibited.
Replacement or substitution of Crystal, Transistors, 1C, Regulator Diodes or any
other part of a unique nature, with parts other than those recommended by us, may
cause violation of the technical regulations of the D.O,C. Rules.

INSTALLATION

CAUTION: The UNIDEN MC4300 will operate only with nominal 12 volt negative
ground battery system.

It is important to carefully determine the most suitable location for your UNIDEN
MC4300 on your vessel. Electrical, mechanical, and environmental considerations
must all be taken into account. You must select the optimum relationship among
these considerations.

Some of the more important external factors to consider in selecting the location of
your UNIDEN MC4300 are:

1, Select a location that is free from spray and splash.
2, Keep the battery leads as short as possible. Connection directly to the battery is

most desirable. If direct connection cannot be made with the supplied power lead,
any extension should be made with #14 AWG wire. Long extensions should use
larger wire.

3, Keep the antenna lead as short as possible. Long antenna leads can cause sub

stantial loss of performance for both receiving and transmitting.

4, Locate your antenna as high as possible and clear from metal objects. The reliable

range of coverage is a direct function of antenna height.

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5. Select a location that does not allow the radio to be subjected to direct sunlight
(including that coming through windows),

6. Select a location well away from the ship's compass. Auxiliary speakers also

should be located away from the compass,

ANTENNA

Since the maximum allowable power output of the transmitter is limited by the
D.O,C„ the antenna is a very important factor affecting transmission distance. It is
for this reason that we strongly recommend that you install only a quality antenna in
your new citizens band system.

Only a property matched antenna system will allow maximum power transfer from
the 50-ohm transmission line to the radiating element. Your Santronic dealer is
qualified to assist you in the selection of the proper antenna to meet your applica
tion requirements.

NOTE: A non shunt-fed antenna must be used for good weather channel reception.
The general rules for antennas are: The more gain the greater the range and the

higher above the water line the greater the range. Antennas should be located so as
not to be in proximity to metal objects. Antenna should not have excessively long
coaxial feed cables.

CONNECTING THE POWER CORDS

After you have carefully considered the various factors affecting your choice of
location, position the radio (with the bracket, microphone, power plug, antenna
plug, and any auxiliary plugs 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 mounting hardware. Drill the holes and mount the bracket with
hardware compatible with the material of the mounting surface. Install the power
cable (red is +, 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.

OPERATING PROCEDURE TO RECEIVE

1. Be sure that the power source, antenna and microphone are connected to the

proper connectors before going to the next steps.

2. Turn the unit ON by rotating the Volume Control clockwise,

3. Set the Channel Selector Switch to the desired channel.

4. Set the Volume Control to a comfortable listening level.

5. Listen to the background noise from the speaker. Turn the Squelch Control
slowly clockwise until the noise JUST disappears (no signal should be present).
Leave the control at this setting. The SQUELCH is now properly adjusted. The
receiver will remain quiet until a signal is actually received. Do not advance the
control too far, or some of the weaker signals will not be heard.

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