Uniden MC 790 User Manual

Aniden

MC 790
MARINE RADIOTELEPHONE
OWNER’S MANUAL

UNIDEN MC790

The UNIDEN MC790 VHP marine radio
transceiver has been designed to give you
a rugged reliable instrument that will pro
vide 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 tran
sceiver so that you can contribute to the
longevity of your investment.

With proper care and maintenance, your
UNIDEN MC790 will outlast your present
vessel and serve you well on board several
more. The full features and ilexibilitv de

signed into this quality transceiver will
prevent it from becoming obsolete regard
less of changes in craft or geographic
locations. The unit may be mounted in
any number of convenient locations by
utilizing the universal mounting bracket.

The UNIDEN MC790 is of all solid state
design with conservatively rated rugged
componepts and materials compatible
with the marine environment. The trans
ceiver utilizes a number of gaskets, sealing

rings,, waterproof membranes, and other
sealants to effect a splash proof housing

for protection of the electronics.

INSTALLATION

CAUTION: The iVlC790 will operate only with nominal

battery systems.

'2 volt negative ground

It is important to carefully determine the

most suitable location for your MC790 on
your vessel. Electrical, mechanical, and
environmental considerations must all be

taken into account. You must select the

optimum relationship among these con

siderations.

Keep in mind the flexibility designed into

the fVlC790 so that you can most conveni

ently use your radio. Features which

should be considered are;

n

], Universal mounting bracket may be

installed on either top or bottom of
shelf, bulkhead, or overhead mount
ing.

2. The microphone connector faces for
ward allowing convenient in-dash or
"built-in" installations.

3. The front panel can be fully reversed ro
provide for optimum viewing and
operating for any mounting position.

‘f. The REMOTE speaker jack may be

used with an auxiliary speaker.

All connections are "plug-in" type for
easy removal of the radio.

I I

A variety of antennas is available from a

number of quality suppliers. It is recom

mended you draw upon the advice of

your Marine Dealer in determining a

suitable antenna for your vessel and
range, requirements.

CHOOSING A tOCATfON

The general rules, for antennas are: The
more gain the greker 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 olyccts.

Antennas should not have exccs.sively

long coaxial feed cables.

Some of the more important external fac

tors to consider in selecting the location

of your MC790 are:

1. Select a location that is free from spray
and splash.

2. Keep the battery leads as short as pos
sible. 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 #10 AWG wire.

Long extensions should use larger

wire. '

3. Keep the antenna lead as short as pos
sible. Long antenna leads cati cause
substantial loss of performance for
both receiving and transmitting,

4. Locate your antenna as high as possi
ble and clear from metal objects. The
reliable range of coverage is a direct
function of antenna height.

5. Select a location that does not allow
the radio to be subjected to direct sun
light (including that coming through

windows).

I

7, Select a location well away from the

ship's compass. Auxiliary speakers also
should be located away from the com
pass.

After you have carefully considereo the

various factors affecting your choice of
location, position the radio (witii the
bracket, microphone, power plug,
antenna plug and any auxiliary plugs
installed) into the selected location to
assure, there is no interference witf? sur
rounding items. Mark the location of the
mounting bracket.

Remove the bracket from the radio and
use it as a template lo mark the hrjie.s to

be drilled for the moutiting iiardware.
Drill the holes and mount the bracket

with hardware compatible with the mate

rial of the mounting surface. Install the
power cable (red ly -t-, black is —),
antenna and all other auxiliary cables and
accessories.

Install the radio into the mounting

bracket and connect all cables and acces
sories to the appcopriate jacks and
connectors.

6. Select a location that allows free air

flow around the heat sink on the rear
of the radio.

C0MT1I015 AND INDICATORS

(V) Microphone Connector , , . Plug

your Microphone here.

(2.1 ON/OFF VOLUME Knob . . .

Turns power on snd adjusts volume le

vel. ■

c

® SQUELCH Knob . . . Used to sil

ence the backoround noise when no
signal is being received. Turn the knob

just past the point where background

noise siHps.

vi;' DIM Control . . . Adjusts the brigh

tness of both LCD and the keyboard
backlighting for night operation.

Key Bo.nrd . . . Selects the desired
channel, LCD display shows CH-1

through CH-88, Forchannels 1 through

9, first you must depress "0'’then the de
sired channel number. Ifyou attempt to
enter CH, 76 and channels other

than VHF marine channels, which are
Ch. 29 - 59, and 89 - 99, the letter ”E"
will flash in the LCD display and also

"70" will flash when Ch. 70 is selected

for transmit on international channels.

To continue normal use of the radio,

make a proper channel selection,

® LCD . . . Provides indication of chan

nel and function even in brightest sun
light.