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AX 144 CB RADIO
OWNERS MANUAL
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--- -. -- RADIO BACK PANEL VIEW EXTERNAL SPEAKER PA Jack SPEAKER POWER Jack Cord Jack 0 0 @ @ @ ANT SERIAL,NO @ ANTENNA SERIAL NUMBER Connector I MPORT ANT! The above pictorial display shows the location of the various accessory, antenna, and power receptacles, as well as the SERIAL NUMBER. You are urged to record your model number and your SERIAL NUMBER in the spaces provided below: Model SERIAL NUMBER -1- -. - - } -- ---- --- L
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~.n SPECIFICATIONS GENERAL Channels 40 AM, 40 LSB, 40 USB 26.965 to 27.405 MHz Frequency Range Frequency Control Phase Locked Loop(PLL) synthesized circuitry :to.005% Frequency Tolerance 0.001 % Frequency Stability -10°C to +50°C Operating Temperature Range Microphone Plug-in type; dynamic with push-to-talk switch and coiled cord Input Voltage 13.8V DC nominal, 15.9V max., 11.7V min. (positive or negative ground). Current Drain Transmit: AM full mod., 2.2A; SSB Maximum output,2A. Receiver: AM &
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RECEIVER Sensitivity 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 @ 7.0 kHz Selectivity Cross Modulation More than 50 dB More than 75 dB Image Rejection AM and SSB: 10.695 MHz t.F. Frequency AM and SSB RF Gain Control Adjustable for optimum signal reception. Automatic Gain Control (AGC): Less than 10 dB change in audio output for inputs from 10 t
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INTRODUCTION UNIDEN has combined superb workmanship and modern styling with the very la- test 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 . FEA
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, == ~ CHANNEL INFORMATION Channel Frequency Channel Frequency Channel Channel in MHz in MHz 26.965 21 27.215 1 2 26.975 22 27.225 3 26.985 23 27.255 -4 27.005 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 9 27.065 29 27.295 10 27.075 30 27.305 31 11 27.085 27.315 27.105 32 12 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 insure that
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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. The transceiver is held in the bracket by the two thumb screws supplied, pe
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~= .-'--' 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 con- venient location with good electrical contact may be use
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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 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. When install
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~ ' -, 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 norma
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~ 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. In order to hear weak signals, it may be necessary to rotate the Squelch control counterclockwise, allowing some backgrou
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<:::::::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. It lights in green color when the microp
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WARNING Oper:ation of this equipment requires a valid station license issued by the Depart- ment of Communication Do not transmit with your equipment until you have a license. - 12- r- 1 t
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--- n .- -~ <::::; MAINTENANCE 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. -13 - F:: ~ - ------
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CIRCUIT DIAGJAM FOR AX144 r------------------------------------------------ I PC-833 I I TRI 2SCI675L .~ I I I .'0' I I I V! J PI-ooe I , I n; !~ I I I I I I I I I I I I I I I I I 0404-' I I .O/ANC I I I I I I I I I I I 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 I I I I UTUAO7524T A Printed in The Philippines
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x: 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 from defects in materials and craftsmanship with only the limitation or exclusions set out below. WARRANTY DURATION. This warranty shall terminate and be of no further effect One (1) year after the date of original purchase of the Product or at the time
