., -=:::::::: r' uniden " AX 144 CB RADIO OWNERS MANUAL ---.
--- -- -. RADIO BACK PANEL VIEW PA SPEAKER Jack @ 0 EXTERNAL SPEAKER Jack POWER Cord Jack 0 @ @ ANT @ SERIAL,NO SERIAL NUMBER ANTENNA Connector I MPORT ANT! The above pictorial display shows the location and power receptacles, as well as the SERIAL You are urged to record your spaces provided below: of the various accessory, antenna, NUMBER. model number and your SERIAL NUMBER in the Model SERIAL NUMBER -1- L } -.
~.n SPECIFICATIONS GENERAL Channels Frequency Range Frequency Control Frequency Tolerance Frequency Stability Operating Temperature Range Microphone Input Voltage Current Drain Cabinet Dimensions Weight Antenna Connector Semiconductors Meter Indicators 40 AM, 40 LSB, 40 USB 26.965 to 27.405 MHz Phase Locked Loop(PLL) synthesized circuitry :to.005% 0.001 % -10°C to +50°C Plug-in type; dynamic with push-to-talk switch and coiled cord 13.8V DC nominal, 15.9V max., 11.7V min. (positive or negative ground).
RECEIVER Sensitivity Selectivity Cross Modulation Image Rejection t.F. Frequency AM and SSB RF Gain Control Automatic Gain Control Squelch Noise Blanker Clarifier Range Audio Output Power Frequency Response Distortion Built-in Speaker External Speaker (Not Supplied) SSB: Better than ,25 p V for 10 dB (S+N)/N at greater than 1f2watt of audio output AM: Better than .5 pV for 10 dB (S+N)/N at greater than 1f2watt of audio output SSB and AM: 6 dB @ 4.2 kHz, 60 dB @ 7.
INTRODUCTION UNIDEN has combined superb workmanship and modern styling with the very latest state-of-art circuitry to bring you the new AX 144 Citizens Band Transceiver. It has been especially designed to give you maximum performance and reliability. YourAX 144 is completely factory aligned and quality assurance tested. To obtain the maximum benefit and pleasure from your AX 144 please read very carefully the contents of this manual before attempting to install or operate the transce~ver . FEATURES .
== , ~ CHANNEL INFORMATION Channel 1 2 3 -4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Channel Frequency in MHz Channel Channel Frequency in MHz 26.965 26.975 26.985 27.005 27.015 27.025 27.035 27.055 27.065 27.075 27.085 27.105 27.115 27.125 27.135 27. 155 27.165 27.175 27.185 27.205 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 27.215 27.225 27.255 27.235 27.245 27.265 27.275 27.285 27.295 27.305 27.315 27.325 27.335 27.345 27.355 27.365 27.375 27.385 27.395 27.
INSTAllATION Location Plan the location of the transceiver and microphone bracket before starting the installation. Select a location that is convenient for operation and does not interfere with the driver or passenger in the vehicle. In automobiles, the transceiver is usually mounted to the dash panel with the microphone bracket beside it. Mounting and Connection This radio is supplied with a universal mounting bracket.
.-'--' ~= This prevents the set being left on accidentally when the driver leaves the car and also permits operating the radio without the engine running. You can locate the accessory contact on most ignition switches by tracing the power wire from the AM broadcast receiver in the car. Note: See ground connection under GENERAL INFORMATION for more detail. 4. Connect the black wire to ground. This is usually the chassis of the car. Any convenient location with good electrical contact may be used.
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 wi 11be 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.
~ ' -, OPERATING INSTRUCTIONS The AX 144 operates on 40 AM channels, 40 Upper Side Band channels and 40 Lower Side Band channels. When you receive the SSB signal in the proper mode, audio sound may be either too high pitched or Iow pitched, indicating that your receiver may not be tuned to the exact same frequency as the transmitter to which it is listening. The AX 144 is equipped with a Clarifier. By tuning the Clarifier, you can slightly change the frequency of the receiver, so you get a normal tone.
~ ,~ T 4. SQUELCH: The squelch control is normally set to a position which just eliminates undesired background noise with no signal present. With the audio volume adjusted to a satisfactory level, rotate the Squelch control clockwise to the point where the sound from the speaker is cut off. In this position, there will be no sound from the speaker until a signal is received.
<:::::::e: - - INDICATOR FUNCTION 1. S/RF METER: This meter displays relative transmitter RF output power when transmitting, and input signal strength when receiving. The meter is illuminated when power is on, the illumination can be adjusted by the DIMMER switch for optimum brightness. 2. TX/RX INDICATOR: The TX/RX light in the upper right corner of the front panel lights in red color when the microphone button is pressed and transmitter is in operation.
WARNING Oper:ation of this equipment requires a valid station license issued by the Department of Communication Do not transmit with your equipment until you have a license.
--- <::::; MAINTENANCE n .- -~ AND ADJUSTMENT This transceiver is especially designed for the environment encountered in mobile installations. The use of all solid state circuitry and its light weight result in high reliability. Should failure occur, however, replace parts only with identical parts. Do not substitute.
- 14- - I ----- 1 ,
CIRCUIT DIAGJAM FOR AX144 r-----------------------------------------------I PC-833 .~ V! n; !~ I I I I I I I J I I I I I I I I I I I I I I I I I I TRI 2SCI675L .'0' ,I PI-ooe I I I I I I I I 0404-' I .
x: uniden@ 12 MONTHS FULL WARRANTY WARRANTOR: UNIDEN AUSTRALIA N.S.W. 2216 ("UNIDEN"). ELEMENTS OF WARRANTY. PTY. LTD. 345 Princes Highway, Uniden Australia warrants, for the duration Rockdale, of this war- ranty, its UNIDEN CB Product to be free from defects in materials and craftsmanship with only the limitation or exclusions set out below. WARRANTY DURATION.