Uniden PRO 640XL User Manual

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PRO 640XL

Professional Mobile CB radio

OWNER'S MANUAL

Welcome!

Tothewortdof sophisticated,miCroprocessorcontrolledCB radio communications. Your Uniden

PRO 640XL represents the most advanced mobile radio ever designed for use in the Citizens
Band Radio Service. Itwill operate on any of the 40 AM, 40 USB or 40 LSB frequencies authorized
by the Department of Transport and Communications (DOTAC). Your PRO 640 XL features a
superheterodyne circuit with PHASE LOCKED LOOP techniques to assure precise frequency
control. This radio has been type accepted and certified by the DOTAC.

WARNING

Before transmitting with your transmitter, you must obtain a Department of Transport and
Communications Citizens Band Radio
Application Form at your nearest DOTAC office. Mail the completed application form and the
appropriate fee to the Supenntendent Regulatory of licensing in the State of Territory in which
the station

will be operated.

CONNECTING THE POWER CORDS

With regard to the connection of the power cords, it may be possible or desirable
to connect the red lead (fornegative ground systems) orthe black lead (forpositive
ground systems) to the ignition switch accessory terminal so that the radio isauto-
matically turned off when the ignition switch (key) is turned off.

Alternately, the power lead may be connected to an available terminal on the fuse
block or even to a point in the wiring harness. Care must be taken, however, to
guard against a short circuit condition. When in doubt, please contact your vehi-
cle dealer for specific information about your vehicle.

(CBRS) license. Obtain a brochure and a caRS Ucense

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1. MIC GAIN - Adjusts the modulation of the mic for crisp, clear transmission.

2. ANL/NB KEY - Youcan select Noise Blankerand Automatic Noise Limi-
ter or allfilters OFF. TheANL/NB helps to reduce harsh background noise caused
by a variety of interference sources.

3. DIM KEY- The dimmer adjusts the front panel lights for optimum viewing.

4. INSTANTCH9 and 19 - Press these keysto instantly select either channel.

Press again to return to normal 40 channel operation.

5. TXand RXINDICATORS- An LEDlights to indicate when the radio istrans-
mitting or receiving.

6. MICROPHONE -The operational mode of the CB is controlled by the push-to-talk switch on

the mic. Press the switch to activate the transmitter and disable the receiver. Release the switch
to enable the receiver and disable the transmitter. When transmitting, hold the mic about 2 inches
from your mouth and speak clearly in a normal voice. The mic included with the PRO 640XL is

a detachable, Iow impedance, dynamic type.

7. S/RF/SWR METER- ThisLEDmeter shows the relative strength of the re-
ceived signal or the RFoutput and the Standing Wave Ratio of your antenna.

8. CHANNEL INDICATOR- Displays the channel currently in use.

9. CHANNELSELECTOR-This switch selects the desired channel for transmission and

reception. Allchannels, except channel 9, may be used for communications.between stations
operating under different license. Channel 9 has been reserved by the DOTAC for emergency
communications involving the immediate safety of individuals or the immediate protection of
property. Channel 9 also may be used to render assistance to a motorist. This is a DOTAC rule
and applies to all operators of CB radios.

10. CLARIFIER- Used to fine tune the receive frequency in USB/LSBmodes.

11. RF GAIN - Press this control when strong signals are present to improvesig-

nal reception sensitivity.

12. SQUELCH- The Squelch control is used to eliminate background noise dur-

ing the absence of a transmission. Turn the control fullycounterclockwise, then

slowly rotate it back, clockwise until allnoise disappears. At this setting any trans-

mission must beslightly stronger than the background noise to "BreakSquelch" or

to be heard. Further clockwise rotation will increase the threshold at which a sig-

nal will be heard. You can select any level to "Break Squelch"

Controls and Functions '"

13. VOLUME CONTROL- Rotate clockwise to turn radio on and to increase

volume.

14. SWR KEY- Press to read the Standing Wave Ratio of your antenna. The

SWRLEDwill light when the SWRkey is pressed.

15. HI CUTKEY- Press to reduce the high frequency response of the receiver.
This key can be used to help eliminate the hiss and pop of weak signal reception.

. 16. PA KEY- Press this switch to the PublicAddress mode when an external PA

speaker is connected. When the PAmode is selected, the CB radio will be dis-
abled. Adjust the PA output level by rotating the mic gain control.

17. AM/USB/LSB Switch - Thisswitch selects the operating mode of either

Amplitude Modulation, Upper Sideband, or Lower Sideband.

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Pro 640XL Front Panel

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R1. ANTENNA CONNECTOR - Thisfemale connector permits connection of
the transmission line cable male connector (Pl-259J to the transceiver.

R2. PUBLICADDRESS - An external 4 ohm 7-watt speaker must be connected
to the "PASP"jack located on the back of the unit. The speaker must be directed
away from the mic to prevent feedback.

R3. EXTERNAL SPEAKER - The "EXT.SP."jack isused for remote monitoring.
The external speaker should have a 4 ohm impedance and be rated at least 7

watts. When an external speaker is connected, the internal speaker is disabled.

R4. POWERCONNECTOR -This connector allows you to connect the power to the PRO 640XL

with the power connecting cable.

Pro 640XL Rear Panel

Mobile Installation

Plan the location ofthe radioand microphone bracket before starting installation.
Select a location that isconvenient for operation and does not interfere with the

driveror passenger in the vehicle. The radio should be securely fastened to a solid
surface using the mounting bracket and self-tapping screws which are provided.

MOBILE ANTENNA

Since the maximum allowable power output of the transceiver is limited by the DOT AC, 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 CB radio system. You have
purchased a superior quality transceiver.. Don't diminish its performance by installing an inferior

antenna.

Only a properly matched antenna system will allow maximum power transfer from the SO-ohm
transmission line to the radiating element. We recommend that you use a SWR meter when

installing your antenna. Set your PRO 640XL to channel 20 and make adjustments to the antenna
until the meter shows SWR = 1. Your local 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 efficient 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 fullquarter wave whip antenna.
For marine installation, consult your dealer for information regarding an adequate grounding

systemand prevention of electrolysis between fittings on the hull and water.

GROUND INFORMA nON

Most newer cars and small trucks use a negative ground system, while some older
cars and some newer, larger trucks may use a positive ground system. A negative
ground system isgenerally identified bythe "-" battery terminal being connected to
the vehicle motor block, but ifyou cannot determine the polarity of your vehicle,
consult your vehicle dealer for information.

NOTE: This radio may be installed and used in any 12-volt DC negative
or positive ground system.

NEGATIVE GROUND SYSTEM

Ifyou are operating on a negative ground system, connect the red DC power cord
from the radio to the positive "+" battery terminal or other convenient point and

connect the black power lead to the chassis orvehicle frame, or the negative "-"
terminal of the battery.

POSITIVE GROUND SYSTEM

Ifyou are operating on a positive ground system, connect the black DC power
cord fromthe radio to the negative "-" battery terminal or other convenient point

and connect the red power lead to the chassis orvehicle frame, or the positive "+"
terminal of the battery.

0 erating.Procedure .

TO RECEIVE

1. Be sure that the power source, antenna and microphone are properly

connected.

2. ~urn the unit on by rotating the Volume control clockwise.

3. S~t the channel selector switch to the desired channel.

4. Set the Volume control to a comfortable listening level.

5. listen to the background noise from the speaker. Turn the Squelch control
clockwise until the noise disappears (no signal should be present). leave the con-
trol at this setting. The squelch is now properly set. The receiverwill remain quiet

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

weaker signals will not be heard.

6. Ifthe transmission you are hearing has annoying high frequency distortion try
activating the Hi Cut feature.

TO TRANSMIT

1. Be sure the operator has read and understands DOTAC rules and regulations priorto operating
the transmitter.

2. Select the desired channel for transmission.

3. Ifthe channeOs clear, depress the push-to-talk switch on the side ofthe microphone and speak

CAUTION: The transceiver Voltage Standing Wave Ratio (VS.W.R.)measure-
ment 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. Please check your SWRreading fre-
quently by pressing the SWRkey.

PREVENTIVE MAINTENANCE

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

1. Check the Standing Wave Ratio (V.S.W.R.)

2. Inspect all electrical connections

3. Inspect antenna coaxial cable for wear

4. Inspect all screws and other mounting hardware

Memo

Troubleshooti ng

Ifyour PRO 640XL is not performing up to your expectations, please try these simple steps. Ifyou

still cannot get satisfactory results after reading this manual and following the trouble shooting
steps, please call Uniden Australia Pty. Ltd. at [phone].

Trouble Check

Unit will not turn on.
No power.

1. Check power cord and all

connections.

2. Check power cord fuse.

3. Check vehicle electrical system.

Poor reception

Weak transmission

'fyou determine that se Niceisnecessary contact your localdealer or pack the unit
in its original carton. Send it along with a brief, concise description of the prob-
lem, your name, address, phone number, and a copy of the original purchase re-
ceipt to the address listed in the warranty.

1. Check and adjust Squelch

2. Check antenna system and cable, connec-
tors.

3. Check operation mode of the radio.

1. Check antenna system and cable, connec-
tors.

2. Check antenna grounding.

3. Check for corrosion on connectors.

SERVICING YOUR CB

Technical information, diagrams and charts will be provided upon request. It is the user's
responsibility to see that this radio is operating at all times in accordance with the DOTAC Citizens

Band Radio Service regulations. We highly recommend that you consult a qualified radiotele-
phone technician for service and alignment of this radio. When ordering parts, it is important to
specify the correct model number and serial number of this radio.

Please refer to the WARNING information on the nrst page of th,s manuat

Specifications

Channels:
Frequency Range:
Frequency Control:

Frequency Tolerance:
Operating Temp.:
Microphone:
Input Voltage:

Current Drain:
Size:

Weight:

Antenna Connector:

LEDMeter:

TRANSMITTER

Power Output:
Freq. Response:
Output Impedance:

RECEIVER

Sensitivity:
Selectivity:

Image Rejection:
I.F.Frequency:
RFGain Control:

Automatic Gain:

Noise Blanker:

Squelch:
Audio Output Power:

Freq. Response:
Distortion:

Internal Speaker:
External Speaker:
PASystem:

40 AM, 40 USB,40 LSB

26.965 to 27.405 MHz
Phase Locked Loop (PLL)synthesizer

:t 0.005%

- lQoCto +50°C
Plug in type: dynamic

13.8 VDC nom. (+ or - ground)

TX:full mod., 3.0A
RX:with max audio output, 1.2A
67/8" W x 8 1/4" 0 x 2"H

3 lb. 2 oz.
UHF, SO-239
Indicates relative RFoutput and received sig-
nal strength and standing wave ratio.

AMmaximumof4W --

SSB maximum of 12W PEP

300 - 2,500 Hz

50 ohms, unbalanced

AM 0.5#V

SSB0.25#V for 10dB (S+ N)/N typical
6dB @7KHz,70dB @10KHztypical

75 dB typical

10.695 MHz

Selectable attenuator for optimum reception

(AGC):less than 10dBchange in audio out-

put for inputs from 10 to 50,000 microvolts

RFtype

Adjustable; threshold less than 1#V

7 watts max. into 4 ohms
300 to 3,000 Hz

less than 10%@5 watts, @1,000Hz
4 ohms, 7 watts round
(not supplied) 4 ohms
7 watts in external 4 ohm speaker

Memo

WARRANTY

Uniden PRO640XL CB Radio Australian 2 Year Warranty.

(Accessories are covered for 90 days only).
Note: Please keep your sales docket as it provides evidence of warranty.
WARRANTOR: Uniden Australia Pty. Ltd.

ELEMENTS OF WARRANTY: Uniden warrants to the original retail owner for the duration of

this warranty. Its PRO 640XL CB Radio (hereinafter referred to as the Product), to be free
from defects in materials and aaftsmanship with only the limitations or exclusions set out

below.
WARRANTY DURATION: This warranty to the original user only shall terminate and be of

no further effect Two (2) Years after the date-of original retail sale. This warranty will be
deemed invalid if the product Is (A) Damaged or not maintained asreasonable and necessary,

(B) Modified, altered, or used as part of any conversion kits, subassemblies, or any configu-
rations not sold by Uniden, (C) improperly installed, (D) Repaired by someone other than an
authorised Uniden Repair Agentfor a defect or malfunction covered by this warranty, (E) Used
in conjunction with any equipment or parts or as partof a system not manufactured by Uniden,
(F) Installed, programmed or serviced by anyone other than an authorised Uniden Repair
Agent, (G) Where the Serial Number label of the product has been removed or damaged
beyond recognition.

PARTS COVERED: This warranty covers for 2 years; the Transceiver and Microphone only.
All accessories, (Leads, Brackets, Clips, Screws etc), are covered for 90 days only.

STATEMENT OF REMEDY: In the event that the product does not conform to this warranty

at any time while this warranty is in effect, the warrantor will at its discretion, _repairthe defect
or replace the product and return it to you without charge for parts or service. THIS
WARRANTY DOES NOT COVER OR PROVIDE FOR THE REIMBURSEMENT OR PAY.

MENT OF INCIDENTAL OR CONSEQUENTIAL DAMAGES.

WARRANTY CARD: If a warranty card had been included with this product then please fill

it in and return it to uswithin 14 days of purchase. Your name and the serial number of the
product will then be registered in our database and this will help us to process your claim with
greater speed and efficiency should you require warranty service.

PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY. In the event that the
Product does not conform to this warranty, the Product should be shipped or delivered freight

pre-paid, with evidence of original purchase, (egIa copy of the sales docket), to the warrantor

at:

UNIDEN AUSTRAUA PTY LTD .SERVICE DIVISION

345 Princes Highway, Rockdale, Sydney. NSW 2216.

Customers in other States should ship or deliver the Product

freight pre-paid to their nearest Uniden Authorised Repair Centre.

(ContactUniden for the nearest Warranty Agent to you).

UTUAO1551CC e Copyright 1992 Uniden Australia Pty. Lttf.

Ph [phone] Fx [phone]

Adelaide (08) .365 2588 Brisbane [phone]

Melbourne [phone] Perth [phone]

Pri"nted in the Philippines