Uniden AX 144 User manual

unlden
АХ 144 CB RADIO
OWNERS MANUAL

RADIO BACK PANEL VIEW
EXTERNAL
SPEAKER
PA Jack
IMPORTANT!
The above pictorial display shows the locatio of the various accessory, a te a.
a d power réceptacles, as well as the SERIAL NUMBER.
You are urged to record your model umber a d your SERIAL NUMBER i the
spaces provided below:
Model ________________ _ ____________________________ _ _____________________
SERIAL NUMBER___________________________________________ _ ___________
- 1 -

SPECIFICATIONS
GENERAL
Cha els 40 AM, 40 LSB, 40 USB
Freque cy Ra ge 26.965 to 27.405 MHz
Freque cy Co trol Phase Locked Loop(PLL) sy thesized circuitry
Freque cy Toléra ce ±0.005%
Freque cy Stability 0.001%
Operati g Température Ra ge •10 °C to +50°C
Micropho e Plug-i type; dy amie with push-to-talk switch
a d coiled cord
I put Voltage 13.8V DC omi al, 15.9V max., 11.7V mi .
(positive or egative grou d).
Curre t Drai Tra smit: AM füll mod., 2.2A; SSB Maximum
output, 2A.
Receiver: AM & SSB with maximum audio
output, 0.6A.
Cabi et Dime sio s 7-9/32(W) x 9-5/64Ю) x 2-9/32(H)
Weight 4.5 Lbs
A te a Co ector UHF, SO-239
Semico ductors 47 tra sistors, 5 i tegrated circuits, 66 diodes
a d 6 light emitti g diodes.
Meter Illumi ated; i dicates relative power output a d
received sig al stre gth, gree receive LED.
I dicators LED display; cha el, emerge cy cha el, ТХ/
RX a d mode.
TRANSMITTER
Power Output AM,SSB Maximum Legal Output Power
Modulatio AM, high a d low level Class B
I termodulatio Distortio SSB: 3rd a d 5th order, better tha -25 dB.
7th a d 9th order, better tha -35 dB.
SSB Carrier Suppressio Better tha -55 dB
U wa ted Sideba d Better tha -50 dB
Freque cy Respo se AM a d SSB: 350 to 2500 Hz.
Output Impéda ce 52 ohms, u bala ced
SSB Filter 10.695 MHz, 8 pole mo olithic type
6 dB @4.2 kHz
60 dB @7.0 kHz
Output I dicators Meter shows relative RF output power; red
tra smit LED.
-2-

RECEIVER
Se sitivity SSB: Better tha ,25 pV for 10 dB
(S+N)/N at greater tha ’/a watt of audio
output
AM: Better tha .5pV for 10 dB
(S+N)/N at greater tha 'A watt of audio
Selectivity
Cross Modulatio
Image Rejectio
I.F. Freque cy
AM a d SSB RF Gai Co trol
Automatic Gai Co trol
output
SSB a d AM : 6 dB @ 4.2 kHz, 60 dB @ 7.0 kHz
More tha 50 dB
More tha 75 dB
AM a d SSB: 10.695 MHz
Adjustable for optimum sig al réceptio .
(AGC): Less tha 10 dB cha ge i audio output
for i puts from 10 to 500,000 microvolts.
Squelch
Noise Bla ker
Clarifier Ra ge
Audio Output Power
Freque cy Respo se
Distortio
Built-i Speaker
Exter al Speaker (Not Supplied)
Adjustable; threshold less tha .5 pV.
RF type, effective o AM a d SSB.
±1.0 kHz
3 watts i to 8 ohms
350 to 2500 Hz
Less tha 10% at 3 watts output.
16 ohms, rou d
8 ohms; disables i ter al speaker whe co 
ected.
PA SYSTEM
Power Output
Exter al Speaker for PA 3 watts i to exter al speaker.
8 ohms ( ot supplied)
- 3 -

INTRODUCTION
UNIDEN has combi ed superb workma ship a d modem Styli g with the very la
test state-of-art circuitry to bri g you the ew AX 144 Citize s Ba d Tra sceiver.
It has bee especially desig ed to give you maximum performa ce a d reliability.
Vour AX 144 is completely factory alig ed a d quality assura ce tested.
To obtai the maximum be efit a d pleasure from your AX 144 please read very
carefully the co te ts of this ma uał before attempti g to i stall or operate the
tra sceiver.
FEATURES
• ALL SOLID STATE: IC a d Tra sistorized co structio , with low curre t drai ,
for a lo g, trouble-free life.
• FULL 40-CHANNEL OPERATION: PLL freque cy, Sy thesizer circuitry allows
tra smissio a d réceptio o ail 40-cha els o AM, USB a d LSB without the
purchase of a y additio al crystals.
• LARGE LED CHANNEL DISPLAY: Cha el umber is displayed by use of LED
(light emitti g diode) display for ease of cha el sélectio .
• CLEAN SIGNAL: Tra smitter audio processi g circuitry produces a clea sig al
with maximum legal modulatio , for best ra ge.
• QUIET RECEPTION: Effective squelch a d automatic oise limiter a d a RF
oise bla ker for superior quieti g.
• EFFECTIVE AGC: Receiver amplified automatic gai co trol (AGC) reduces the
effect of différe ces i received sig al stre gths. No distracti g "blasti g" a d
“ fadi g" of sig ais.
• AN EFFICIENT TRANSMITTER: Provides maximum legal output power to the
a te a.
• PUBLIC ADDRESS FUNCTION: Useful for pagi g a d a ou ceme ts.
• TRICOLOR LED MODE INDICATOR: Gree for AM mode, Yellow for USB
mode a d Red for LSB mode.
• EMERGENCY CH 9 SWITCH: This switch e ebles you to select emerge cy
cha el (CH 9) regardless of the cha el selector switch setti g.
- 4 -

CHANNEL INFORMATION
Cha el Cha el Freque cy
i MHz Cha el Cha el Freque cy
i MHz
1 26.965 21 27.215
2 26.975 22 27.225
3 26.985 23 27.255
427.005 24 27.235
5 27.015 25 27.245
6 27.025 26 27.265
7 27.035 27 27.275
8 27.055 28 27.285
927.065 29 27.295
10 27.075 30 27.305
11 27.085 31 27.315
12 27.105 32 27.325
13 27.115 33 27.335
14 27.125 34 27.345
15 27.135 35 27.355
16 27.155 36 27.365
17 27.165 37 27.375
18 27.175 38 27.385
19 27.185 39 27.395
20 27 205 40 27.405
To i sure that you obtai the maximum performa ce from this radio, please read
carefully the followi g descriptio s a d operati g i structio s.
NOTE: This radio has bee desig ed for operatio i the 11 meter Citize s Ba d
Radio Service. It uses a freque cy sy thesizi g circuit with Phase Locked
Loop(PLL) tech iques to provide crystal co trolled tra smit a d receive
operatio o all 40 Cha els. The PLL circuitry assures ultraprecise
freque cy co trol. It is desig ed to meet the Departme t of Commu
icatio requireme ts applicable to equipme t operati g i the Citize s
Ba d Radio Service, a d is ot to be used for a y other purpose. MS 312 of
the D.O.C. régulatio s defi es operatio i this service, a d you are required
to read a d u dersta d these régulatio s prior to operati g this equipme t.
-5-

INSTALLATION
Locatio
Pla the locatio of the tra sceiver a d micropho e bracket betöre starti g the
i stallatio . Select a locatio that is co ve ie t for operatio a d does ot i terfère
with the driver or passe ger i the vehicle. I automobiles, the tra sceiver is usually
mou ted to the dash pa el with the micropho e bracket beside it.
Mou ti g a d Co ectio
This radio is supplied with a u iversal mou ti g bracket. The tra sceiver is held i
the bracket by the two thumb screws supplied. permitti g adjustme t to the most
co ve ie t a gle. The bracket must be mou ted with the machi e screws supplied.
The mou ti g surface must be mecha ically stro g. Proceed as follows to mou t the
tra sceiver:
1. After you hâve determi ed the most co ve ie t locatio i your vehicle, hold the
radio with mou ti g bracket i the exact locatio desired. If othi g i terfères
with mou ti g it i the desired positio , remove the mou ti g bracket bolts.
Before drilli g the holes, make sure othi g will i terfère with the i stallatio of
the mou ti g bolts.
2. Co ect the a te a cable plug to the sta dard réceptacle o the rear pa el. Most
CB a te as are termi ated with a type PL-259 plug which mates with the
réceptacle o the rear pa el.
3. Co ect the DC power i put wire with the fuse (red) to +12V DC. This wire
exte ds from a plug which co ects to the rear pa el. I automobile i stallatio s,
+ 12V DC is usually obtai ed from the accessory co tact o the ig itio switch.
- 6 -

This preve ts the set bei g left o accide tally whe the driver leaves the car a d
also permits operati g the radio without the e gi e ru i g. You ca locate the
accessory co tact o most ig itio switches by traci g the power wire from the
AM broadcast receiver i the car.
Note: See grou d co ectio u der GENERAL INFORMATION for more detail.
4. Co ect the black wire to grou d. This is usually the chassis of the car. A y co -
ve ie t locatio with good electrical co tact may be used. (remove pai t).
5. Mou t the micropho e ha ger o the side of the u it or ear the u it, usi g two
screws supplied. Whe mou ti g i ап automobile, place the ha ger o the dash
so the micropho e is easily accessible.
GENERAL INFORMATION
GROUND CONNECTION
This radio may be i stalled a d used i a y 12V DC egative or positive grou d
system vehicle. Most ew U.S. a d foreig madę cars or smali trucks use a egative
grou d system while some older cars a d some ewer large trucks may use a positive
grou d system.
1. Negative grou d system: Co ect the Red power lead from the radio to the
positive or (+) battery termi al or other co ve ie t poi t, a d co ect the Black
power lead to the chassis or vehicle frame or (-) battery termi al.
2. Positive grou d system: I the case of positive grou d system, co ect the Black
power lead from the radio to the egative or (-) battery termi al or other
co ve ie t poi t, a d co ect the Red power lead to the chassis or vehicle frame
or (+) battery termi al.
ANTENNA
This radio is desig ed to operate i to a 52 ohm CITIZENS RADIO a te a. Best
results will be obtai ed from your tra sceiver if you use a good a te a, properly
i stalled. (Refer to the a te a i stallatio i structio s i cluded with your a te a.)
A vertically polarized quarter-wavele gth whip a te a provides the most reliable
operatio a d greater ra ge. The shorter loaded-type whip a te as are more at
tractive, compact a d adéquate for applicatio s where the maximum possible dis
ta ce is ot required. Also, the loaded whip a te as do ot prese t the Problems of
height imposed by the full quarter-wavele gth whip.
- 7 -

Mobile whip a te as utilize the metal body of the vehicle as a grou d pla e. Whe
mou ted o a cor er of the vehicle, they are slightly directio al, i the directio of
the body of the vehicle. For all practical purposes, however, the radiatio patter is
o -directio al. A slight directio al characteristic will be observed o ly at extreme
dista ces. A sta dard a te a co ector (Type SO 239) is provided o the
tra sceiver for easy co ectio to a sta dard PL-259 cable termi atio .
Whe i stalled i a boat, the tra sceiver will perform most efficie tly whe
a te a used has bee specifically desig ed for mari e applicatio s.
Before i stalli g the tra sceiver i a boat, co sult your dealer for i formatio
regardi g a adéquate grou di g system a d préve tio of electrolysis betwee fitt
i gs i the hüll a d water.
BASE STATION OPERATION
То operate the tra sceiver from your home or office, usi g regulär house curre t as
the power source, you will require a separate power supply capable of supplyi g 2.5
amps at a 13.8V DC output with a omi al i put voltage of 120 volts AC, 50/60Hz.
Simply co ect the red (+) a d black (-) leads of the tra sceiver to the correspo d-
i g DC termi ais of the power supply.
NOTE: Do ot attempt to operate this tra sceiver by co ecti g directly to 117V
AC. Whe AC power supply is used with the tra sceiver for base statio
operatio a y Citize s Ba d beam, dipole, grou d pla e or vertical a te a
may be used. A grou d pla e vertical a te a will provide the most u iform
horizo tal coverage.
REMOTE SPEAKER
The exter al speaker jack (EXT. SPKR) o the rear pa el is used for remote receiver
mo itori g. The exter al speaker should hâve 8 ohms impéda ce. Whe the exter al
speaker is plugged i , the i ter ai speaker is disco ected.
PUBLIC ADDRESS
A exter al 8 ohm 4-watt speaker must be co ected to the (PA SPKR) jack located
o the rear pa el whe the tra sceiver is used as a public address system. The speaker
should be directed away from the micropho e to preve t acoustic feedback. Physical
séparatio or isolatio of the micropho e a d speaker is importa t whe operati g
the PA at high output levels.
- 8 -

OPERATING INSTRUCTIONS
The АХ 144 opérâtes o 40 AM cha els, 40 Upper Side Ba d cha els a d 40
Lower Side Ba d cha els.
Whe you receive the SSB sig al i the proper mode, audio Sou d may be either
too high pitched or low pitched, i dicati g that your receiver may ot be tu ed to
the exact same freque cy as the tra smitter to which it is liste i g. The AX 144 is
equipped with a Clarifier. By tu i g the Clarifier, you ca slightly cha ge the
freque cy of the receiver, so you get a ormal to e.
M 'PF GAIN CONTROL DIGITAL LED CH9 INDICATOR
MODE SELECTOR
OPERATING CONTROLS
Your AX 144 , designed for ease of operation, is provided with the following
operating Controls:
1. OFF/ON VOLUME: To tur the tra sceiver o , rotate the co trol clockwise
past cl ick. То tur the tra sceiver off, rotate the co trol cou terclockwise past
click. Rotate the co trol clockwise for a comfortable audio volume level.
2. CHANNEL SELECTOR: This switch is used to select a y o e of the 40
Citize s Ba d cha els. Cha el 9 has bee reserved by the D.O.C. for
emerge cy commu icatio s i volvi g the immédiate safety of life of i dividuals
or immédiate protectio of property. Cha el 9 may also be used to re der
assista ce to a motorist.
3. MODE SELECTOR: This switch selects AM, USB or LSB mode of operatio .
This selector cha ges the mode of operatio of both tra smitter a d receiver
simulta eously.
Set the selector to the mode o which you wish to commu icate. For easier
ide tificatio of the mode, LED mode i dicator is provided i three differe t
colors, gree for AM, yellow for USB, a d red for LSB.
- 9 -

4. SQUELCH: The squelch co trol is ormally set to a positio which just
élimi âtes u desired backgrou d oise with o sig al prese t. With the audio
volume adjusted to a satisfactory level, rotate the Squelch co trol clockwise to
the poi t where the sou d from the speaker is eut off. I this positio , there will
be o sou d from the speaker u til a sig al is received. I order to hear weak
sig ais, it may be ecessary to rotate the Squelch co trol cou terclockwise,
allowi g some backgrou d oise to be heard.
5. CLARIFIER: The clarifier is ormally set to the ce ter positio . This feature
has several uses a d ca greatly e ha ce receiver operatio . If a receive sig al
is slightly off freque cy, this co trol ca be operated to optimize the receive
sig al. This co trol is primarily i te ded to tu e i SSB sig ais, but, it may be
also used to optimize the AM sig al.
6. MIKE GAIN: This co trol is used to adjust, as required, micropho e i put
se sitivity for optimum amou t of modulatio i tra smit UNIDEN's citize 's
ba d tra sceivers hâve bee desig ed to permit the user to attai levels of
modulatio up to 100% depe di g o the setti g of the micropho e gai
co trol, usi g the micropho e provided with the u it. UNIDEN's automatic
compressio a d peak limiti g circuits assure maximum modualtio with mi i
mum distortio .
7. DIMMER SWITCH: This switch is used to adjust the bright ess of the LED
cha el display a d the meter. DIM positio reduces bright ess.
8. CH9 SWITCH: This switch is for use whe emerge cy commu icatio is eeded
o the emerge cy cha el CH9. Pressi g the CH9 switch activâtes CH9
regardless of the positio of the cha el selector switch. Whe CH9 switch is
pressed, the cha el display is bla ked a d the CH9 i dicator is activated.
9. PA-СВ SWITCH: This co trol e gages the PA fu ctio . The PA fu ctio should
ot be used u less a exter al speaker is co ected. I the CB positio , the PA
fu ctio is disabled a d the radio will tra smit a d receive o the selected
cha el.
10. NB/ANL SWITCH: Whe the switch is placed i the NB/ANL positio , both of
RF Noise Bla ker a d Automatic Noise Limiter circuits are activated. The
NB is very effective for répétitive impulse oise such as ig itio oise. The
ANL reduces a oyi g hash-type oises.
11. RF GAIN: This co trol is used primarily to optimize réceptio i stro g sig al
areas. Gai is reduced by cou terclockwise rotatio of the co trol.
- 10 -

1. S/RF METER: This meter displays relative tra smitter RF output power whe
tra smitti g, a d i put sig al stre gth whe receivi g. The meter is illumi ated
whe power is o , the illumi atio сап be adjusted by the DIMMER switch for
optimum bright ess.
2. TX/RX INDICATOR: The TX/RX light i the upper right cor er of the fro t
pa el lights i red color whe the micropho e butto is pressed a d tra smitter
is i operatio . It lights i gree color whe the micropho e butto is released
a d the receiver is i operatio .
PRESS TO TALK MICROPHONE
The receiver a d tra smitter are co trolled by the press-to-talk switch o the
micropho e. Press the switch a d the tra smitter is activated. Release the switch
to receive. Whe tra smitti g, hołd the micropho e about three i ches from your
mouth a d speak at a ormal voice level.
RECEIVE OPERATING PROCEDURE
1. Place the CB-РА switch i CB positio .
2. Tur the set o by tur i g the VOLUME CONTROL clockwise, past click.
NOTE: Micropho e must be plugged i for receiver to operate.
3. Set the VOLUME CONTROL to a comfortable level.
4. Set the Mode Selector Switch to the desired mode.
5. Liste to the backgrou d oise from the speaker. Tur the SQUELCH
CONTROL slowly clockwise, u til the oise just disappears. The Squelch is ow
properly adjusted. The receiver will remai quiet u til a sig al is received. Do
ot adva ce the co trol too far, or some of the weaker sig ais will ot be heard.
6. Set the Cha el Selector to the desired cha el.
7. Adjust the CLARIFIER to clearly receive SSB or AM sig ais.
TRANSMIT OPERATING PROCEDURE
1. Select the desired cha el of tra smissio .
2. If the cha el is elear, depress the push-to-talk switch o the micropho e a d
speak i a ormal voice.
INDICATOR FUNCTION
- 11 -

WARNING
Operatio of this equipme t requires a valid statio lice se issued by the Depart
me t of Commu icatio Do ot tra smit with your equipme t u til you hâve
a lice se.
- 12 -

MAINTENANCE AND ADJUSTMENT
This tra sceiver is especially desig ed for the e viro me t e cou tered i mobile
i stallatio s. The use of all solid state circuitry a d its light weight resuit i high
reliability. Should failure occur, however, replace parts o ly with ide tical parts. Do
ot substitute.
- 13 -

CIRCUIT DIAGRAM FOR AX144
UTUA07524TA Pri ted i The Philippi es
J {___.

uniden
12 MONTHS FULL WARRANTY
WARRANTOR: UNIDEN AUSTRALIA PTY. LTD. 345 Princes Highway, Rockdale,
N.S.W. 2216 ("UNIDEN"|.
ELEMENTS OF WARRANTY. Uniden Australia warrants, for the duration of this war-
ranty, its UNIDEN CB Product to be free fro defects in aterials and crafts anship
with only the li itation or exclusions set out below.
WARRANTY DURATION. This warranty shall ter inate and be of no further effect
One (1 ) year after the date of original purchase of the Product or at the ti e the Pro
duct is (a) da aged or not aintained as reasonable and necessary, (b) odified, (c)
i properly installed, (d) is repaired by so eone other Warrantor for a defect or al
function covered by this Warranty, or (e) used in a anner or purpose for which the
Product was not intended.
PARTS COVERED. This Warranty covers ail co ponents of the Products.
STATEMENT OF REMEDY. In the event that the Product does not confor to this
Warranty at any ti e while this Warranty is effective, Warrantor will repair the defect
and return it to you prepaid, without charge for parts, service, or any other costs in-
curred by Warrantor or its représentatives in connection with the perfor ance of this
Warranty. In addition, if the Product contains a defect or alfunction which is not re-
pairad after a reasonable nu ber of atte pts by Warrantor to repair the Product, the
Product or defective co ponent will at our discrétion, will be replaced without
charge, when the defective product is delivered to the warrantor at 345 Princes High
way, Rockdale. N.S.W. 2216free and elear of ail liens and encu brances. Please note
that while the Product will be re edied under this Warranty without charge. THIS
WARRANTY DOES NOT COVER OR PROVIDE FOR THE REIMBURSEMENT OR PAY
MENT OF INCIDENTAL OR CONSEQUENTIAL DAMAGES.
So e States do not allow this exclusion or li itation of incidental or consequenlial da
ages, so the above li itation or exclusion ay not apply to you.
PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY: In the event that
the Product does not confor to this Warranty, the Product should be shipped pre
paid, to Warrantor at 345 Princes Highway, Rockdale, N.S.W. 2216. THE ORIGINAL
OR COPY OF THE SALES RECEIPT OR OTHER VALID EVIDENCE OF THE DATE OF THE
ORIGINAL PURCHASE MUST ACCOMPANY THIS PRODUCT.
LEGAL REMEDIES: This Warranty gives you specific legal rights, and you ay also
hâve other rights which vary fro state to state
uniden
Australia Pty. Ltd.
HEAD OFFICE:
345 Pri ces Highway, Rockdale, N.S.W. 2216
Pho e: 599 3355
Fax: [phone]
BRISBANE
3/12 Randall Street, Slacks Creek,
Old. 4127
Phone [phone]
Fax [phone]
PERTH
23 Geddes Street, Balcatta,
W.A. 6021
Phone [phone]
Fax [phone]
MELBOURNE & TASMANIA
446-448 Bell Street, East Preston,
VIC. 3072
Phone [phone]
Fax [phone]
ADELAIDE
72-74 Halifax Street, Adelaide
S.A. 5000
Phone [phone]
Fax [phone]
Pri ted i the Philippi es
UTUA01524TC © Copyright 1992 Uniden Corporation