Uniden AX 144 User Manual

uniden

AX 144 CB RADIO
OWNERS MANUAL

RADIO BACK PANEL VIEW

EXTERNAL
SPEAKER

PA Jack

ANTENNA SERIAL NUMBER
Connector

IMPORTANT!

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 -

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

TRANSMITTER
Power Output

Modulation

Intermodulation Distortion

SSB Carrier Suppression

Unwanted Sideband

Frequency Response
Output Impedance
SSB Filter

Output Indicators

SPECIFICATIONS

40 AM, 40 LSB, 40 USB
26,965 to 27,405 MHz
Phase Locked Loop(PLL) synthesized circuitry
±0.005%

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).

Transmit: AM full mod,, 2.2A; SSB Maximum

output, 2A.
Receiver: AM & SSB with maximum audio

output, 0.6A.

7-9/32(W) X 9-5/64(D) x 2-9/32(H)

4.5 Lbs

UHF, SO-239
47 transistors, 5 integrated circuits, 66 diodes

and 6 light emitting diodes.

Illuminated; indicates relative power output and
received signal strength, green receive LED.
LED display; channel, emergency channel, TX/
RX and mode,

AW,SSB Maximum Legal Output Power
AM, high and low level Class B
SSB: 3rd and 5th order, better than -25 dB.

7th and 9th order, better than -35 dB.
Better than -55 dB
Better than -50 dB
AM and SSB: 350 to 2500 Hz.
52 ohms, unbalanced

10,695 MHz, 8 pole monolithic type
6dB@4,2(<Hz
60dB@7.0kHz
Meter shows relative RF output power; red
transmit LED.

- 2-

RECEIVER
Sensitivity

Selectivity
Cross Modulation

Image Rejection

I.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)

PA SYSTEM

Power Output

External Speaker for PA

SSB: Better than j25 itV for 10 dB

(S+Nl/N at greater than 'h watt of audio
output

AM: Better than ,5 [i\! for 10 dB

{S-(-N)/N at greater than Ys watt of audio

output
SSB and AM: 6 dB @ 4.2 kHz, 60 dB @ 7.0 kHz
More than 50 dB

More than 75 dB

AM and SSB: 10.695 MHz

Adjustable for optimum signal reception.
(AGC): Less than 10 dB change in audio output
for inputs from 10 to 500,000 microvolts.
Adjustable; threshold less than .5/jV.
RF type, effective on AM and SSB.
±1.0 kHz
3 watts into 8 ohms
350 to 2500 Hz

Less than 10% at 3 watts output.
16 ohms, round
8 ohms; disables internal speaker when con
nected.

3 watts into external speaker.

8 ohms (not supplied)

- 3 -

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.
Your AX 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
transceiver.

FEATURES

ALL SOLID STATE: 1C and Transistorized construction, with low current drain,
for a long, trouble-free life.

FULL 40-CHANNEL OPERATION: PLL frequency, synthesizer circuitry allows
transmission and reception on all 40-channels on AM, USB and 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 selection.

CLEAN SIGNAL: Transmitter audio processing circuitry produces a clean signal
with maximum legal modulation, for best range.

QUIET RECEPTION: Effective squelch and automatic noise limiter and an RF
noise blanker for superior quieting.

EFFECTIVE AGC: Receiver amplified automatic gain control (AGO reduces the
effect of differences in received signal strengths. No distracting "blasting" and

"fading" of signals,

AN EFFICIENT TRANSMITTER; Provides maximum legal output power to the

antenna,

PUBLIC ADDRESS FUNCTION: Useful for paging and announcements,

TRI-COLOR LED MODE INDICATOR: Green for AM mode. Yellow for USB

mode and Red for LSB mode.

EMERGENCY CH 9 SWITCH: This switch enebles you to select emergency

channel (CH 9) regardless of the channel selector switch setting.

- 4 -

CHANNEL INFORMATION

Channel

1 26.965 21 27.215
2 26.975
3 26.985
4
5 27.015
6 27.025

7
8 27.055 28 27.285
9 27.065 29 27.295

10

11 27.085

12 27.105 32 27.325
13 27.115 33
14
15
16 27.155 36
17
18 27.175
19 27.185 39
20 27 205

Channel Frequency

in MHz

27.005

27.035

27.075 30

27.125 34

27.135 35 27.355

27.155 37

Channel

22
23
24
25
26
27

31

38 27.385

40 27.405

Channel Frequency

in MHz

27.225

27.255

27.235

27.245

27.265

27.275

27.305

27.315

27.335

27.345

27.365

27.375

27.395

To insure that you obtain the maximum performance from this 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 synthesizing circuit with Phase Locked
LoopIPLLI techniques to provide crystal controlled transmit and receive
operation on all 40 channels. The PLL circuitry assures ultraprecise
frequency control. It is designed to meet the Department of Commu
nication requirements applicable to equipment operating in the Citizens
Band Radio Service, and is not to be used for any other purpose MS312 of
the D.O.C. regulations defines operation in this service, and you are required
to read and understand these regulations prior to operating this equipment.

-5-