Uniden UH077 User Manual
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UHF CB TRANSCEIVER
OWNER’S MANUAL
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UH-077
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DESCRIPTION
YourUNIDEN Model SUNDOWNER UH-077 represents the most advanced Mobile Sta
tion type radio ever designed for use in the Citizens Band Radio Service. It will operate on
any of the 40 frequencies designated as citizens band channels by the Department of
Communications. Your Model SUNDOWNER UH-077 features a frequency synthesizing
circuit with PHASE LOOK 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. Beforecompleting the form you should read the conditionsgoverning the li
censing and operation of the C.R.S. (D.O.C. brochure RB250). This brochure also
can be obtained from the D.O.C. After completing the application form, mail it with
the appropriate fee to the Superintendant Regulatory of Licensing in the State or
territory in which 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:
Channel
2
3
4
5
6
7
8
9
10
11
12
13
14
Channel Frequency
In MHz
476.425 15
476450 16
476.475 17
476.500 18
476.525
476.550
476.575
476.600
476.625
476.650
476.675
476.700
476.725
476.750
Channel
21
22 476.950
24
28
Channel Frequency
in MHz
476.775 29
476.800
476.825
19
20
23 476.975
25 477.025
26 477.050
27
476.850 32
476.375 33
476.900 34
476.925 35
477.000 38
477 075
477.100
DUPLEX OPERATING FREQUENCIES
CHANNEL RX
CHI
CH2 476.450 ”
CH3
CH4
476 425 MHz
476,475 ”
476.500 ”
477.175 MHz (CH31)
477,200
477.225
477,250
TX
" (CH32)
" (CH33)
" (CH34)
CHANNEL
- 2 —
Channel
30 477.150
31 477.175
36
37
39
40 477.400
RX TX
CH5 476,525 MHz
CH6
CH7
CHS
476,550 " 477.300
476.575 ” 477.325
476.600 ” 477.350
Channel Frequency
in MHz
477.125
477.200
477 225
477.250
477.275
477 300
477 325
477,350
477 375
477.275 MHz (CH35)
" (CH36)
" (CH37)
" (CH38)
INSTALLATION
MOBILE STATION INSTALLATION
Plan the location ot 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 in the vehicle. Theradioshouldbesecurely 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 is for this reason that
we strongly recommend that you install only a quality antenna in your new citizens band
system. You havejust 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 50ohm 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.
Forautomobile 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, consultyourdealerfor information regarding an adequate ground
ing system and prevention of electrolysis between fittings in the hull and water.
GROUND SYSTEM
Connect the red DC powercord from the tran sceiverto the positive, or (-h), battery terminal
or other convenient point and connect the black power lead to the chassisor 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 in your 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 in your 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.
-3~
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 suretheoperatorhasread and understands D,0,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 foflowing 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.
* Check to see that the transmission line (coaxial cable) is securely connected to the
ANTENNA CONNECTOR.
* Be sure that the antenna is fully extended for proper operation.
* Be sure that all transmission line (coaxial cable) connections are secure and free of
corrosion.
- 4-
CONTROLS AND THEIR FUNCTIONS
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 low impedance dynamic type.
2. MEM/SKIP SWITCH:
In the NORMAL mode; PresstheMEM/SKIPswitch to program or disable channels in
the selected scan memory.
In the GROUP SCAN mode: When scanning, press the MEM/SKIP switch toHOLDthe
channel currently being scanned. Press again to resume scanning.
In the OPEN SCAN mode: When scanning, press the MEM/SKIPswitch to SKIP over a
busy channel you do not wish to listen to.
3. SCAN SWrrCH: When this switch is pressed, the SUNDOWNER UH-077 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 ‘OUT 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:
In the 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,
— 5 —
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