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Mobile  whip  antennas  utilize  the  metal  body  of  the  vehicle  as  a  ground  plane.  When 

mounted  on  a  corner  of  the  vehicle,  they  are  slightly  directional,  in  the  direction  of 

the  body  of  the  vehicle.  For  all  practical  purposes,  however,  the  radiation  pattern  is 

non-directional.  A  slight  directional  characteristic  w ill  be  observed  only  at  extreme 

distances.  A  standard  antenna  connector  (Type  SO  239)  is  provided  on  the 
transceiver  for  easy  connection  to  a standard  PL-259 cable  termination.

When  installed  in  a  boat,  the  transceiver  w ill  perform  most  efficiently  when 
antenna  used  has  been  specifically  designed  for  marine  applications.

Before  installing  the  transceiver  in  a  boat,  consult  your  dealer  for  information 

regarding  an  adéquate  grounding  system  and  prévention  of  electrolysis  between  f i t t ­
ings  in  the  hüll  and  water.

BASE  STATION  OPERATION

То  operate  the  transceiver  from   your  home  or  office,  using  regulär  house current  as 

the  power  source,  you  w ill  require  a  separate  power  supply  capable  of  supplying  2.5 
amps  at  a  13.8V  DC  output  with  a nominal  input  voltage  of  120 volts  AC,  50/60Hz. 

Simply  connect  the  red  (+)  and  black  (-)  leads  of  the  transceiver  to  the correspond- 
ing  DC terminais  of  the  power  supply.

NOTE:  Do  not  attempt  to  operate  this  transceiver  by  connecting  directly  to  117V 

AC.  When  AC  power  supply  is  used  with  the  transceiver  for  base  station 

operation  any  Citizens  Band  beam,  dipole,  ground  plane or  vertical  antenna 

may  be  used.  A ground  plane  vertical  antenna  w ill  provide  the  most  uniform 

horizontal  coverage.

REMOTE  SPEAKER

The  external  speaker  jack  (EXT.  SPKR)  on  the  rear panel  is  used  for  remote  receiver 

monitoring.  The  external  speaker  should  hâve  8 ohms  impédance.  When  the  external 

speaker  is plugged  in,  the  internai  speaker  is  disconnected.

PUBLIC  ADDRESS

An  external  8  ohm  4-watt speaker  must  be connected  to  the  (PA SPKR)  jack  located 

on  the  rear  panel  when  the  transceiver  is  used  as  a  public address system.  The speaker 

should  be  directed  away  from   the  microphone  to  prevent  acoustic  feedback.  Physical 
séparation  or  isolation  of  the  microphone  and  speaker  is  important  when  operating 
the  PA  at  high  output  levels.

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Summary of Contents for AX 144

Page 1: ...unlden 144 CB RADIO OWNERS MANUAL...

Page 2: ...ious accessory antenna and power r ceptacles as well as the SERIAL NUMBER You are urged to record your model number and your SERIAL NUMBER in the spaces provided below Model________________ __________...

Page 3: ...Connector UHF SO 239 Semiconductors 47 transistors 5 integrated circuits 66 diodes and 6 light emitting diodes Meter Illuminated indicates relative power output and received signal strength green rece...

Page 4: ...5 MHz Adjustable for optimum signal r ception AGC Less than 10 dB change in audio output for inputs from 10 to 500 000 microvolts Squelch Noise Blanker Clarifier Range Audio Output Power Frequency Res...

Page 5: ...LSB without the purchase of any additional crystals LARGE LED CHANNEL DISPLAY Channel number is displayed by use of LED light emitting diode display for ease of channel s lection CLEAN SIGNAL Transmit...

Page 6: ...radio please read carefully the following descriptions and operating instructions NOTE This radio has been designed for operation in the 11 meter Citizens Band Radio Service It uses a frequency synth...

Page 7: ...ust be mechanically strong Proceed as follows to mount the transceiver 1 After you h ve determined the most convenient location in your vehicle hold the radio with mounting bracket in the exact locati...

Page 8: ...large trucks may use a positive ground system 1 Negative ground system Connect the Red power lead from the radio to the positive or battery terminal or other convenient point and connect the Black po...

Page 9: ...e power supply capable of supplying 2 5 amps at a 13 8V DC output with a nominal input voltage of 120 volts AC 50 60Hz Simply connect the red and black leads of the transceiver to the correspond ing D...

Page 10: ...turn the transceiver on rotate the control clockwise past cl ick turn the transceiver off rotate the control counterclockwise past click Rotate the control clockwise for a comfortable audio volume le...

Page 11: ...up to 100 depending on the setting of the microphone gain control using the microphone provided with the unit UNIDEN s automatic compression and peak limiting circuits assure maximum modualtion with m...

Page 12: ...hes from your mouth and speak at a normal voice level RECEIVE OPERATING PROCEDURE 1 Place the CB switch in CB position 2 Turn the set on by turning the VOLUME CONTROL clockwise past click NOTE Microph...

Page 13: ...WARNING Operation of this equipment requires a valid station license issued by the Depart ment of Communication Do not transmit with your equipment until you h ve a license 12...

Page 14: ...pecially designed for the environment encountered in mobile installations The use of all solid state circuitry and its light weight resuit in high reliability Should failure occur however replace part...

Page 15: ...CIRCUIT DIAGRAM FOR AX144 UTUA07524TA Printed in The Philippines J _ _ _...

Page 16: ...ponent will at our discr tion 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 encumb...

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