Uniden MC 790 User Manual

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MC 790
MARINE RADIOTELEPHONE
OWNER'S MANUAL

::'.;:,',",',.>",',:," .',,'",:',UNIDEN:MC790",,:'>:" "",:" ,

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-

, ,

" "" ' ,":,~:INSTALIATI()N'" ' > "

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:

~

J. 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 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

. i

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

rlo

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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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CID

CDMicrophone Connector. . . Plug

your Microphone here.

(~) ON/OFF VOLUME Knob...

Turns power on and adjusts volume le-

vel.

\'

@ 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.

= ~=

"

CD REMOTE Speaker Connector

. . . If you desired to use anol/ler

speaker in C)ddition to the one in the un-
it, a four or eight ohm speaker equipped
with a miniature phone plug may be

conneCted to, this jack.

~ DC Power Connector. . . Battery

connections are to be made with the
cable supplied to mate with this con~

nector. Remember, red is +, black is-,
The power cord ;s equipped with a fuse
to protect the radio. Use only a Six(6)

AMPEREfast blow fuse for replacement.

@ ANT Connector. . . This connec-

tor is for connection of the antenna. A

type PL259 connector is required to

make proper connection.

Note: Tile racJio must lK' connected lCI,1

power source (or LIlt' nJ<'IIJory to fw1i ll()(}
properly. Remember nor"~o disconneCL ll"1e
power cable, or you will lose the memory.
However, when this unit is not going (0 tJe
used for a long period of time, be SUfC'10
disconnect the power cclble for safety tJe-
cause the current of less than 1mA is fee! for

memory back-up even after the radio is
OFF. (But in this case, you will lose tfle
memory.)

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;:: :'.,:~:,,",)'. ,: ':':'cARE',:ANDMINTEI\tANCE,' " , ',:~

. ",' .' ~

Your MC790 is a precision piece of elec-

tronic equipment and you should treat it
accordingly. Due to the rugged design,
very little ma,intenance is required,

however, a feJJ precautions should be
obseNed,

Ifyour radio has been accidentally subject-
ed to splay or splash you should immediate-
lywipe it down with a soft cloth dampened

with fresh water,

If the antenna has been damaged, you

should not transmit except in case of
emergency. A defective antenna may
cause damage to your radio.

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,:'KEI:;'FUNcnoi\t.'::.. :.~

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[MANU'J

['"TERl

LElETE ]

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This key turns on the Memory Scan and gives you "SCAN" on LCD, j: tile

squelch is in operation and Scan Memory Channels are programmed, Scan
starts its operation While it is on, the second digit of the channel nuf,'ber

shows movement indicating that the Scan is on.
When the radio receives a signal on a programmed channel while MC'11Orv
Scan is on, and squelch opens, it indicates its channel number and Sldy' , 0;
that channel. \X/hen the signal is gone, squelch closes and Memory Sc;m is
reaCtivated.

This key ;s used to check Memory Scan or when all the memory SCc1:1is
deleted. It is also used when "0" is flashing by mispressing the scan key
with no channel number programmed in memory scan. If you pres:; this
key in a normal operation, it shows each channel number programmccJ in
Memory Scan.

This is the key to turn on the Memory Scan Channel. Select the char1nel

you wish to program, then press the ENTER Key.i'MEM" is indicated on

the left hand of the channel number to indicate that the program is com-
pleted.

This key deletes the programmed Memory Scan Channel(s). When this key
is pressed, the lowest numbered channel in the Memory Scan is indicated
and deleted. Ifyou keep pressing it. the next lowest channel numtJcr is
ir1dicated for deletion. "0" flashes whenall the memory scan channel:; are

deleted.

Thttse keys arc used (0 progr;:HT1cll<tnnel numbers. Tlw first numl)cr you
press becomes rile first digit, and if the second digit ,~ not progr.:wirned
within 10 seconds after the first one, it returns to lhe previous channel.
When the seleCted channel number does nOt exist, "E" flashes.

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lUS~NTJ

L~J

(87 AI
L_J

This key gives you international cllannels or USA channels with an indica-
tion of "INT" or "USA" on the display. When the radio is activated,
international channels are auromarieally available and by pressing the key,
it goes ro USA channels

This key gives you instant access to channel 16 and "'J6" will be indicated
on LCD when you press it.

This key gives you instant access to channe/87A and "87"will be indicated on

LCD when you press it. If channel 87A is seleCted from keyboard while op-
erating USA. channels, LCD WILL FLASH" u",

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[,w~L ]

By pressing this key, "DUAL" is indicated on the display. Every one and ci half

seconds, it monitOrs CH 16, If the receiver hearsa signal on CH ]6, it locks ontO

that channel. Wt,en the signal stops, it returns ro monitoring CH) 6 ('very

one and a half seconds. "DUAL" can be operated along with Memory Sc,m.

By pressing the "DUAL" key, it can be cancelled.

By pressing this key, the power out-put can be changed to 1Wand ir WI!Ibe
indicated on LCD. By pressing this key again, the power out-put returns (0

25W and the indication on LCD will be turned off.

NOTE:

The MC790 has a self-check function to indicate malfunCtions due to overly high
incoming nj;)jse leve/sand sudden, drastic changes of power voltage levels wllen the
unit is on. This self-check will illuminate all segments of the LCDwhen triggered. If
tllis should occur, t?urn unit off, then back on to rese[ rhe microprocessor chip. The

programmed functions will not be erased as long as the Back-up BaneI)', is functioning.

Plea'se read the Owner's Manual carefully before operating your unit.

(2) TURN UNIT OVEfi ANO CAREFULL Y

REMOVE COVER CABINET

PULL UP FROM REAR FIRST.

~NET //

(3) DISCONNECT

SPEAKER WIRES. /I/ /.

(5) REMOVE TWO SCREWS

HOLDING FRONT PANEL
TO CHASSIS.

(6)TILT FRONTPANEL.

(7) REPLACE FOUR SCREWS TO

SECURE FRONT PANEL TO
CHASSIS.

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(4) REMOVE

SPEAKER CABINET.

(1) REMOVE FOUR SCREWS

FROM SPEAKER

". CABINET.

(8) CAREFULLY REPLACE CovER CABINET BUT ON BOTTOM OF RADIO INSERT UNDER FROWi

PANEL FIRST AND THEN LOWER AT REAR OF RADIO.

(9) TURN RADIO OVER AND nr:CONN[CT SPFAKUi WIRe I FIIDS

(101 HEPOSITION SPEAKER CIIBINET ON TOP OF RADIO AND REPLACE FOUR SCHE.WS TO SECUH:.

THE HOUSING.

(11) RETIGHTEN FOUR APPEARANCE COVER SCREWS.

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Interference from the impulse noise gen-

erated by the electrical systems of engines

is sometimes a problem with radios. The
MC790 has been designed to be
essentially impeNious to ignition impulse

noise and alternator noise. However, in
some installations it may be necessary to

take measures to further reduce the effect
of no;.<;c interference. All DC t)auc(y

1}

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wires, antenna lead, and accessory cables
should be routed away from the engine
and engine compartment and from power

cabling carrying particularly high currents.

In severe cases of Lmpulse noIse interfer-
ence, it may be necessary to install a noise
suppression kit that is available from your

M':HincDCcl/er.

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CHANNEL

DESIGN

-;--_. 56.050
02 I 156.100

03 1 156.150

04 .) 56.200

05
06

07
OH
09

10

11

12
13
14
15
16

17

18

19
20
21"
22
23 157.150
24
/5 ':;7.7.50
2(, 15/.300 16I. 'lOO
27
28
60 156.025
61
62
63
64
65
66 1567.S i 156.37<;
67 156375 156.37'.> ,
68
69
70
71

n.

73
74
77
78
79
80 157.025
81 157.075
82
83
84
85 157.275

86
87

88

FREQUENCY (MHzJ

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SHIP

I

156.250 156.250 VIS

156.300 1%.300

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1'd, '100 I ',t, ,i()tJ

,j6.450 156.450

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156,500

I

156,550

I

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156.600 156.600

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156.650

I

156.700 156.700

I

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156.800

i

156.850

156.900 1%.900

I

156.950

I

157.000 161.600

I

157.050

i

157.100

i

157.200 161 ROO

157.350
I57.400 162.000

1'56.075 156.075
)56.125 )56.125

156.175

:

)56.225 )56.225

156.275

!56,425

156.475 156.475

156.525

156.575 156.575

156.625 15667.5
156,675 156.675

156.725 156.725

156.875 156.875

' 56.925

i

156.975

;

)57. 125 )57. 125

157.175 157.) 75 (oasl Guard

157.225

157.325

157.375 16/975

I

J57.425 162.025

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-

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SHORE,

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--'---- -'-'1-"--"-'" -.. --.... .,--- ---. - -,..

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156.050

'

156.100

I

156.150
)56200

I:,t, 'I',n

156.500 : Com"

156.550 Com"

156.650

!

;

156.750 Environment,l'

15(.800

156.850

156.950

157.050

157.100

157.150 Coast Guard

1(,I lJ',tJ

16/.950

156025

)56. 175

156.275

156.425 Non Com', Yes

156.525

1692

156.975 Corn"

157.025

!

157.075

161.825
16/.875

J61.925

---'-1

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TYPE

TRAFFIC

VIS

POr! Ops

Port Ops
Port Ops

S,lfciy

( ,\1,,'1

("""
(0111"&Non Corn',

f'ort Ops
Navigational
Par! Ops

S, ,fC I Y (:11111 Jq

SIdle (ontrol
Com"
Corn" Yes

Por! Ops
Coast Gu,Jrd
Coast Guarc

PIJI)I,( (or((",('
"ul,l" <'011(",1'
Pt/DI'l (0"":,/1
Public Corresp
PubliC Corresp.

Port Ops
POri Ops
Corn"

Non Corn" Yes
Non Corn" Yes
Non Corn"
Non Com"
Port Ops
Port Ops Yes
Pan Ops

Non (om" Yn

Corn"
Coast Guard
US Gov Only

Public Corresp.
Public Corresp.

Public Corresp.

Public Corresp.
Com"

SHIP

TO SHIP

........,_.h

Y(' Yrs

Ye Ye.',

Ycs

Ye:.

Yes

Y"" Ne.
Y"', Y,".
Y.."

Yes

Yes Yes

Yes Yrs
Yes
Yes YesI

Yes

RX Only

Y,.\ Y,'\

Yes Yc\

Yes Yes

i

Yes

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Yes
Yes Yes Coast Guard
Yes Y('s
Nu Y,".

tJ..

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No
No

Yes

Ycs
Ycs :

Yes Yc.s Fish
Yes
Yes

.

Yes No

Yes Yes
Yes
Yes
Ycs
Yes

No Yes
No

No

No Yes

Yes

SHIP PERMANENT

TO SHORE SCAN LIST

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Yes

Yes ','
Yes

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CO,,,,! C;IJ,!Ii!

N"I

Yes

Yes

Yes

RX Onl,'

Yes

Ycs
Yes Coast GU,'flJ

'("',

Y,",

Yes !
Yes

Yes
Yn
No
Yes Flstl
Yes Fish
No

No

Yes
Yes

Yc

Yes
Yes Coast Guard

Yes

Yes

i Yes

Yes

No

hsl1

Environment c',i

Coast GU,l((;

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fjIJ"Y I,"
Uuyl('i.
Busy Tei.
Busy Tel.

Fish

Fish

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Coast Gu<\((

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Busy Tei.

BusyTe'..
BusyTel.

Busy Tel.

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Busy Tel.

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CHANNEL I FREQUENCY {MHzJ

n !

_.'.~_E_~~GN -.-l=~---~;~~--~_.! ~~~;~ ~:.

0 I I 156.050 i 160.650 ! VTS

02 : 156. I00 ! 160.700 : Pan Ops

03 i 156.150 i 160.750 . Pan Ops
04

i 156.200 : 160.800 '

05 '156.250! 160.B50 I VTS
0(, 1

(Jt I',{,'!';n i If,n'I',() (,,","

011 ",(,'100 I ",{, '100 ((JIII',

09 ,. '

10 156.500 156500; Corn',

11 I 156.550 i 156550 Corn'l
12 I 156,600 i )56.600 Pon Ops

13
14 156.700
J5 I 156.750 156.750 Envlronmenta'

16 I 156.BOO 1 15(JfiOO i S;.dr'ly Cllllne)

17

1~ 156.900 i 161.500 , Corn"

19 '

20 157.000 16 1.600 : Port Ops

21 157.050! 161.650 ; Coast Guard

22 157.100! 161.700 : CoastGuard

23 157.150

74 IS7.l00 1{,lnOO! f'ul)l,rCC)r(('~,p
/~, ,~,//')() '

l() '~{)O(J
27 157.:150 161.950! Public Corresp.

28
60 156025
61 : 156.075 160.675

62 1156125 1160.725
63 I

64 ,156.225 I 160.825

65 ! 156.275 I 160.875
66 i "'156.325 I 160925

67

68 i 156.425 I 156.425

69 I 156.475

70 ! - ,156.525

71 156.575 I 156.575

72 156.625 i 156.625

73 156.675 i 156.675

74

77 156.875 '

713

79 I 156.975 I 161.575

80 I 157.025 I 161.625

81 I 157.075

82 : 157.125 161.725

83 i 157.175 I 161.775

84 157.225 I 161.825

85 157.275

86 157.325 161.925

87

87A 157.375 I 157.375

88 157.425: 162.025

1')6.300 ~ 156.300 ' ~dtcty

1

' 156.450

I

1 156.650 i 156.650 Navigational

1

156.850 i 156.850 StdtC Control

I

156.950 I 161.550 ,Corn"

I

157.400 I 162.000 : Public Corrc>sp.

I

156.175 ! 160.775

1

~ 156.375 I 156.375

156.725 : 156.725

I

,156,925 161.525

I

.,.

]57.375 i 161.975

I

156.450 Corn" & Non Cam',

I

156.700 . Port Ops

I

161.750 i Coast Guard

I

I{,III',(J : 1""J"',(O"""p

I

161.')()O ! 1"UIJlic(orrc',p.

I

160.625 '

I

156.475

I

156.875

I

]61.675

I

161.875

I

' Pan Ops

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i

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I

; Pon Ops

i Pon Op~

i Com'l

Non Com'l
Non Corn"
Non Corn"
Non Corn"
Non Corn"

Pon Ops
Port Ops
Pan Ops
Non Corn"
Corn"
Corn',
COi1st Guard

US Gov Only
Coast Guard

Public Corresp.
Public Corresp.
Public Corresp.
Public Corresp.

Corn"

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TYPE

TRAFFIC

... .-. --- on. _. -0--'

SHIP i SHIP I PERMANENT

TO SHIP: TO SHORE I SCAN LIST

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! I

Yes I ¥es !

Yes I Yes i
Yes i Yes i
YesI: Yes

Ycs Yes
Ye~ No

Y"', Y'""!

¥n : Nu i

Yes Yes: Fisll

Yes : Yes !
Ycs

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Yes I Yes
Yes i Yes
Yes i Yes

Yes! Yes Environmental
Yc~ Yes

Yes Yes I

Yes I Yes;

Yes" Yes i

Yes Yes
Yes Yes.
Yes Yes!

Ye~ Yes i

No Yes I

NrJ Yc\ I
No , Yes I
No ! Yes
No i Yes

Yes
Yes
Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

YC's
Yes
Yes

Yes

Yes
Yes
Yes
No

j

No

i

No

,

I

,
!
I

Yes No

! .

Yes

Yes
Yes
No

Yes
Yes

No
Yes

1>10

Yes
Yes
No
Yes

Yes

Yes

Yes.

Yes
Yes
Yes
Yes

Yes

Yes

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f3IJ\Y Tel.
I3IJ\Y Tel.
Busy Tcl.
Busy Tel.
Busy Tel.

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Fish
Fish

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' Fish

Fish

/

Fish

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I Coast Guard

I CoastGuard 1

I Busy Tel. !

Busy Tel. I
8usy Tel. I
Busy Te/.

Busy Tel. I

CAUTION: OPERATION ON CHANNELS] 5 AND] 7 HAS BEEN ELECTRONICALLY
RESTRICTED TO LOW POWER TO PROTECT CH, 16, THE DISTRESS FREQUENCY.

~ . I

- ,"'.."" '. .""'.,"-.'..,.,,':"';; ...;,~:;,~;,,;:,:.,,~,~.., "'::">:'."'~>:':\~

SPECIFI

"""'

'-"I,' <;,',::' ..:::~:: "":':::.",,:'~/~,jV:.'::'

IONS

""":"""" "'.,:;,,(, . ::,":,":';:":~'.if...:',

GENERAL

Channels

Frequency Control

: Transmit55

Receive 80

: PLLsynthesizer

Method

Antenna Impedance

Speaker'
Microphone

Channel Display
Frequency Stability

Operating Tempera-
ture Range

Shock and Vibration
Size

Weight

Controls

Connectors
Frequency Range

Lights and Indicators: Channel Number, ITXI , 25W, IW, USA, 1NT, DUAL,

Standard Accessories: Plug-in microphone, mounting bracket and hardware,

Supply Voltage.

TRANSMITfER
Power Output

Power Requirement

Modulation

! Hum and Noise

Attenuation
Audio Distortion

Spurious Emission

Output Transistor
Protection

Output Power
Stabilization

: ~Oohms, nominal
: 2.85 inch, 8 ohms

: Rugged 600 ohms dynamic element with coiled cord

and plug-in connector

:L.c.D
. :to.001%
: :t 20°C to + 50°C

: Meets or exceeds EIAstandards, RS] 52B and RS204C

: 7-1/4"W (185m/m) x 9-5/8"L (245m/m) x 2-1/4"H

(58m/m)

: 1.6 kg

: On-Off/Volume, Squelch & Dimmer controls, ;KeyBoard

: Antenna, microphone, remote speaker. DC power

: J56 to J58 MHz transmit

156 to J63 MHz receive

SCAN, MEM, Backlight Key Board & LCD,

DC power cord, mike hanger, spare fuse, owner's
manual

: J3.8V DC negative ground

.

: 25 or I watt (keypad selectable)
: 25 watts output: 5.0A ~I 13.8V DC

I wan output: I.OA ~I' 13,8V DC
: FM, :t 5 kHz deviation
: 40 dB

: Less than 5% with 3 kHz deviatjon with] 000 Hz

modulating frequency

: -70 dB
: Built-in

: Built-in automatic level control (ALC)

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SPECIFIt'ATIONS:' ':~~'"

RECEIVER

Sensitivity

Threshold Squelch

Sensitivity

Tight Squelch

Sensitivity
Spurious Response

Attenuation

Image Response

Attenuation

Intermodulation

Attenuation
Adjacent Channel

Rejection Selectivity

Audio Output Power: 3.5 watts minimum at J0% distortidQ at } kHz modula-

Power Requirement - : O.6A ((11I3.8V DC squelC[led

IF Frequencies

Hum and Noise Level: -50 dB (EIA method)

: 0.35,.uV for 12 dB SINAD

0.50pV for 20 dB SIN

: 0.20pV (EIA method) -

: 2.01-lV (EIA method)

: 75 dB

: 75 dB

: 65 dB (~1112 dB SINAD

: 70 dB (EIA method)

: ::t7.5kHz (a,6 dB down

::t 15 kHz ((I 60 dB down

tion and::!: 3.5 kHz deviation (4 ohm speaker)

J.2A ((pI3.8V DC at r~Hcd audio output

": Jst-c-21.4MHz .

2nd- 455 kHz

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