Uniden MC 790 User Manual

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MC 790
MARINE RADIOTELEPHONE
OWNER'S MANUAL

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The UNIDEN MC790 VHF marineradio

transceiver has been designed to give you

a rugged reliable instrument that will pro-

videyou with years of trouble-free se Nice,

signed into this quality transceiver will

prevent itfrom becoming obsolete regard-

less of changes in craft or geographic
locations. The unit may be mounted in
any number of convenient locations by

You are encouraged to thoroughly read
this manual to acquaint yourself with the

characteristicsand operation of your tran-

sceiver so that you can contribute to the
longevity of your investment.

With proper care and maintenance, Y0ur

UN/DEN MC790 will outlast your present
vessel andseNe you well on, board several
more. The full feCltures and flexibility de-

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utilizing the universal mounting bracket.

The UNIDEN MC790 isof allsolid state

design with conseNatively rated rugged
componepts and materials compatible

with the marine environment. The trans-
ceiver utilizes a number ofgaskets, sealing

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

for protection of the electronics.

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CAUTION: The MC790 will operate only with nominal J2 volt negative ground
battery systems,

It is important to carefully determine the

most suitable location foryour MC790on

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 MC790 so that you can most conveni-

ently use your radio. Features which
should be considered are:

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J. Universal mounting bracket may be

installed on either top or bottom of

shelf, bulkhead, or overhead mount-

ing.

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2, The microphone connector faces for-

ward allowing convenient in-dash or

"built-in" installations.

3, The front panel can be fully reversedto

provide for optimum viewing and

operating forany mounting position.

4, The REMOTE speaker jack may be

used with an auxiliary speaker,

All

connections are "plug-in" type for

easy removal of the radio.

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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. '

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Someof the more important external fac-

tors to consider in selecting the location
of your MC790 are:

1. Select

2. Keep the battery leads as short as pos-

supplied r power lead, any extension

3. Keep the antenna lead as short as pos-

4. Locate your antenna as high as possi-

5.

a location that is free from spray

and splash.

sible. Connection directly to the
battery is most desirable. If direct

connection cannot be made with the
should be made with # 10 AWG wire.

Long extensions should use larger
wire.

sible. Long antenna leclcJsCZlrlcause
substantial loss of performance for
both receiving and transmitting.

ble and clear from metal objects. The

reliable range of coverage is a direct
function of antenna height.

Select a location that does not allow

the radio to be subjeCted to direct sun-

light (including that coming through

windows).

The general rules for antennas are The
more g~j/n the greater the range and, the

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higher above the water line the greater
the range. Antennas should be located so
as not to be in proximity to metal or'wets.

Antennas should not have excc~..::.ively

long coaxial feed cab/cs.

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7. Select a location well away frorn the
ship's compass. Auxiliary speakers also

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should be located away from the com-

pass,

After you have cc!refl1l1y consicJerc(j the

various factors affecting your choice of

location, position the radio (wi(i! the

bracket, microphone, power iJlug,

antenna plug and any auxiliary plugs

installed) into the selected location to

assure, there is no interference with sur-

rounding items. Mark the location of the

mounting bracket.

Remby~ ,the bracket fror:n the racJio and

use itas a template to mark the hole') to

be drilled for the mounting rlc!rc!wcIre.
Drill the holes and mount the br,]cket

with hardware compatible with the mate-
rial of the mounting ~urface. fnst;l:1 the
power cable (red f~ +, black 1\ -I,

antenna and all other auxiliarycables and

accessories.

Install the radio into the mounting

bracket and connect all cables an(j (~cces-

sories to the apprf)priate jacks and
connecrors.

6. SeleCt a location that allows free air
flow around the heat sink on the rear

of the radio.

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CDMicrophone Connector. . . Plug

your Microphone here.

(~) ON/OFF VOLUME Knob...

Turns power on and adjusts volume le-

vel.

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@ SQUELCH Knob. . . Used to sil-

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

just past ttle point where background

noise stops.

C£'DIM Control. . . Adjusts the brigh-

tnesS' of both LCD and the keyboard
back lighting for night operation.

(~ Key Board. . . Selects the desired

channel. LCD display shows CH-]
through CH-88. Forchannels ] through
9, firstyou must depress "0" then the de;-
sired channel number. Ifyou attempt to
enter CH. 75, 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.