Uniden Sundowner UH-077 Owner's Manual

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UHF CB TRANSCEIVER

OWNER'S MANUAL

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UH-O77 U U GS. IDUPIICAI1051 -

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DESCRIPTION

Your UNIDENModel SUNDOWNER UH-O77represents the most advanced Mobile Sta-
tion type radio ever designed for use in the Citizens Band Radio Service. Itwilloperate on

any of the 40 frequencies designated as citizens band channels by the Department of
Communications. Your Model SUNDOWNER UH-O77features a frequency synthesizing
circuit with PHASE LOCK LOOP techniques to assure ultraprecise Frequency control.
This radio has been Type Accepted and Type Certified by the D.O.C.

WARNING

Before transmitting with your transceiver, you must obtain a Department of Com-

munications (D.O.C.) Citizens Radio Licence. Obtain an application form from the

D.O.C.Beforecompletingtheformyoushouldreadtheconditionsgoverningtheli-

censingand operationoftheC.R.S. (D.O.C. brochure RB250). This brochure also

can be obtainedfromthe D.O.C.Aftercompletingtheapplicationform,mailitwith

theappropriate fee to the Superintendant Regulatoryof Licensingin theStateor
territory"inwhich the station will be operated.

CHANNEL INFORMATION

This radio has been designed to provide high level performance in the Citizens Band Radio
Service, which is comprised of the following frequency assignments:

DUPLEX OPERATING FREQUENCIES

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Channel

Channel Frequency

Channel

Channel Frequency

Channel

Channel Frequency

in MHz in MHz

inMHz

1

476.425

15

476.775

29 477.125

2

476.450 16 476.800

30 477.150

3

476.475 17 476.825

31 477.175

4

476.500

18

476.850

32 477.200

5 476.525

19 476.875 33

477.225

6 476.550

20 476.900

34

477.250

7 476.575

21 476.925

35

477.275

8

476.600 22

476.950

36

477.300

9

476.625 23

476.975

37

477.325

10 476.650

24 477.000 38

477.350

11

476.675

25

477.025

39

477.375

12

476.700 26

477.050

40

477.400

13

476.725

27

477.075

14

476.750

28 477.100

CHANNEL RX

TX

CH1

476.425 MHz

477.175 MHz (CH31)

CH2 476.450"

477.200

.. (CH32)

CH3 476.475"

477.225

.. (CH33)

CH4

476.500"

477.250

.. (CH34)

CHANNEL

RX

TX

CH5

476.525 MHz

477.275 MHz (CH35)

CH6

476.550

"

477.300

.. (CH36)

CH7 476.575

"

477.325

.. (CH37)

CH8

476.600

"

477.350

.. (CH38)

INSTALLATION

MOBILE STATION INSTALLATION

Plan the location of the transceiver and microphone bracket before starting the installa-

tion. Select a location that is convenient for operation and does not interfere with the driver
or passenger inthe vehicle. The radio should be securely fastened to some solid face, us-

ing the mounting bracket and self-tapping screws which are provided.

MOBILE STATION 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 isfor this reason that

we strongly recommend that you install only a quality antenna in your new citizens band
system. You have just purchased a superior transceiver. Don't diminish its performance
by installing an inferior antenna.

Only a properly matched antenna system will allow maximum power transferfrom the 50-
ohm transmission line to the radiating element. Your Uniden dealer is qualified to assist
you in the selection of the proper antenna to meet your application requirements.

For automobile installation, the whip antenna may be used with good effect. The most effi-
cient and practical installation is a full quarter wave whip antenna mounted on the rear

deck or fender top midway between the rear window and bumper.
A short "loaded" whip antenna is more convenient to install on your automobile, although

the efficiency is less than a full quarter wave whip antenna.

For marine installation, consult your dealerfor information regarding an adequate ground-
ing system and prevention of electrolysis between fittings in the hull and water.

GROUND SYSTEM

Connect the red DC power cord from the transceiver to the positive, or (+), battery terminal
or other convenient point and connect the black power lead to the chassis or vehicle frame,
or (-) battery terminal.

SELCALL

SELCALL (Selective Calling) is a special Squelch System which quiets your receiver until

it receives an Encoded signal from another set which matches the one installed inyour set.

This means your set will remain quiet and not receive idle chit chat or other signals until the
station you want to hear calls.

SELCALL is not initially installed inyour set (each one has to be individually programmed)
but may be purchased as an option.

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 OFF/VOLUME Control clockwise.

3. Set the CHANNEL SELECTOR switch to the desired channel.

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4. Set the OFF/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 re-

main quiet until a signal is actually received. Do not advance the control too far, or

some of the weaker signals will not be heard.

OPERATING PROCEDURE TO TRANSMIT

CAUTION -

The transceiver Voltage Standing Wave Ratio (V.S.W.R.) measurement must be
performed prior to the use of the transmitter. A V.S.W.R. ratio in excess of 2:1 may
damage the transmitter.

1. Be sure the operator has read and understands D.G.C. Rules and Regulations prior to
operating the transmitter.

2. Select the desired channel.

3. If the channel is clear, depress the PRESS-TO' TALK switch on the microphone and
speak in a normal voice.

PREVENTIVE MAINTENANCE

At six to twelve month intervals, the following system checks should be made:

1. Check Standing Wave Ratio (SWR).

2. Inspect all electrical connections to ensure that they are tight.

3. Inspect antenna coaxial cable for wear or breaks on shielding.

4. Inspect all screws and other mounting hardware for tightness.

OPERATOR TROUBLESHOOTING

Should the unit malfunction or not perform properly, the operator should perform the
procedures indicated below:

1. If the transceiver is completely inoperative.
* Check the power cord and fuse.

2. If trouble is experienced with receiving.
* Check OFF/VOLUME control setting.
* Be sure SQUELCH is adjusted properly. Is the radio over-squelched?
* Check to see that the radio is switched to an operational mode.

3. If trouble is experienced with transmitting.

* Checktoseethatthetransmissionline(coaxialcable)issecurelyconnectedtothe

ANTENNACONNECTOR.

* Be sure that the antenna isfully extended for proper operation.
* Besurethatalltransmissionline(coaxialcable)connectionsaresecureandfreeof

corrosion.

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1

2

1. PRESS- TO-TALK MICROPHONE: The receive and transmit are controlled by the

PRESS- TO-TALK switch on the microphone. Press the switch on the microphone to
activate the transmitter; release the switch to receive. When transmitting, hold the

microphone two inches from the mouth and speak clearly in a normal voice. The mic-
rophone provided with your radio is detachable Iow impedance dynamic type.

2. MEM/SKIP SWITCH:
Inthe NORMAL mode: Press the MEM/SKIP switch to program or disable channels in

the selected scan memory.

Inthe GROUP SCAN mode: When scanning, press the MEM/SKIP switch to HOLD the
channel currently being scanned. Press again to resume scanning.

in the OPEN SCAN mode: When scanning, press the MEM/SKIP switch to SKIP over a

busy channel you do not wish to listen to.

3. SCAN SWITCH: When this switch is pressed, the SUNDOWNER UH-O77 will scan any
channels programmed in the selected Scan mode.

NOTE: The radio will not Scan if the selected Scan memory has not been programmed.

4. OPEN SCAN/GROUP SCAN SELECT SWITCH: This switch is used to select the re-
quired Scan mode. When this switch is'IN', the radio is able to scan in the OPEN SCAN

mode.
Press this switch 'our to scan in the GROUP SCAN mode.

5. DUPLEX INDICATOR: When the channel indicated by the CHANNEL INDICATOR
and Duplex memory is programmed, this LED is turned on.

6. TX INDICATOR: This LED indicates red while transmitting.

7. TONE CALL INDICATOR:
Inthe GROUP SCAN mode & NORMAL mode: When a signal has been received on the

PRIORITY channel this LED will be on.
When a SELCALL module is installed: While receiving TONE SIGNAL, this LED will be

on.

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