Galaxy dx48t User Manual

TABLE OF CONTENTS

PAGE

CHAPTER 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BIG RIG SERIES

S

MOD

PWR

DX 48T

TB PW R

9

+2

7

0

5

+4

3

1

60

40

20

0

1

5

0

2

5

.

1

SWR

1

dB

0

+6

80

0

1

00

%

20

30

40

50

3

TB
OFF

MA

X

MIC

B
AH

10 Meter

Amateur Mobile Transceiver

D

E

CF

G

MOD FM

VO L SQ

OFF

SW R A M

MIC GAIN RF GAIN

PAPW R

NB/ANL

+10KHz
NB/ANL

OFF

BRIGHT

MED

EC H O TIME

EC H O

OFFDIM

CHAPTER 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installing The Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Ignition Noise Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Public Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

CHAPTER 3

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Procedure to Receive and Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Alternate Microphone and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 10

With StarLite Face Plate

OWNER’S MANUAL

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CHAPTER 1 SPECIFICATIONS

GENERAL

Model

DX 48T

Frequency Range 28.315 ~ 28.755 MHz

Emission AM/FM

Frequency Control Phase-Lock-Loop (PLL) Synthesizer

Frequency Stability 0.001%

Temperature Range

-30°C to +50°C
Antenna Impedance 50 Ohms

Antenna Connectors Standard SO-239 type

Input Voltage 13.8V DC

Size

Weight

7 3/4" (W) x 2 7/8" (H) x 10 1/4" (D)

6 lb.

TRANSMITTER

RF Power Output AM/FM: 50W

Spurious Emission -50 dB

Audio Distortion 10%

Frequency Response 300 to 2500 Hz

Microphone Dynamic

RECEIVER

Sensitivity for 10 dB (S+N)/N AM: < 0.5 uV

Sensitivity for 12 dB (S+N)/N FM: < 0.25 uV

Squelch Sensitivity < 0.5 uV

Selectivity -55 dB

Image Rejection -50 dB

Hum & Noise 40 dB

AGC Figure of Merit 100 mV for 10dB Change in Audio Output

Audio Power Output 2.5W @ 10% Distortion

Audio Response 300 to 2500 Hz

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)

CHAPTER 2 INSTALLATION

INSTALLING THE RADIO

Choose a convenient location for operation that does not interfere with driver or
passenger. This radio is supplied with a universal mounting bracket. When mounting
the bracket and radio to your car, make sure it is mechanically strong. Also, provide a
good electrical grounding connection to the chassis of vehicle. Proceed as follows to
install the radio.

1. Locate a convenient area in your vehicle for the installation of the radio. Hold the

mounting bracket with the radio in the location where the radio is to be installed.
Make sure nothing will interfere with either the radio or the mounting bolts. Mark
and then drill holes for the mounting bracket.

2. Most radio antennas come equipped with a PL-259 plug. Connect this plug to the

ANT. Jack in the rear of the radio.

3. Extending from the rear of the radio is a fused red and black wire for the DC

connections to the vehicle’s electrical system. For best performance, it is strongly
recommended that the red lead be taken directly to the positive terminal on the
vehicle’s battery and the black lead be connected to the nearest chassis ground.
(Note: This radio is designed for vehicles with negative ground systems.)

Connections should be made using appropriate “crimp on” lugs of a size large
enough to make good contact with the bolt used to fasten to the battery and the
chassis ground. It is a good safety idea to install a second fuse that would provide
protection in case the red wire was to “fray” or get pinched and short to the body of
the vehicle, somewhere between the battery and the radio.

High power radios such as this one require large DC current flow when in the TX
mode. Poor power connections cause supply voltage drops that can substantially
decrease the performance of your radio. A good DC connection is probably one of
the most important things for getting the best transmitter performance and in some
cases, least receiver noise.

4. Mount the microphone bracket near the radio in an easily accessible spot using the

two screws provided.

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- 3 -

IGNITION NOISE INTERFERENCE

With weak signals, you may experience interference of the signal by background
noise. This radio has NB and ANL circuits which will help reduce background noise
from sources such as your ignition system. However, background electrical noise may
come from several sources and all noise may not be eliminated. With extremely weak
signals, you can operate this radio with the engine turned off, which should improve
reception. If the ignition noise level is too high to allow proper operation under most
conditions, you should have your installation of the radio checked by a qualified
technician.

ANTENNA

This radio has a jack in the rear for a standard PL-259 antenna plug. If you are
looking for the most range for your transmission, use a vertically polarized, quarter­wave length antenna. If antenna height is a problem, you may use a shorter, loaded-type
whip antenna although you can expect some loss of transmission range.
To improve performance, your antenna should be matched to your radio. Your antenna
can be adjusted so that it matches your radio.

EXTERNAL SPEAKER

The external speaker jack (EXT SP.) on the rear panel is used for remote receiver
monitoring. The external speaker should have 8 ohms impedance and be able to handle
at least 4 watts. When the external speaker is plugged in, the internal speaker is
disconnected.

PUBLIC ADDRESS

To use the Public Address (PA) function, first connect an external speaker to the PA.
SP. Jack on the rear of the radio. See the above specifications for a proper external
speaker. Keep the speaker away from the microphone to avoid acoustic feedback.

CHAPTER 3 OPERATION

CONTROL FUNCTIONS
FRONT PANEL

10 11 12 13 14 15 16 17 18 19 20 21 22

BIG RIG SERIES

9

+2

7

0

5

+40

S

3

1

60

40

20

0

1

5

MOD

0

PWR

2

5

.

1

SWR

1

dB

+6

80

1

00

%

20

30

40

50

MA

X

3

TB PW R

0

TB
OFF

DE

C
B
A

F

G
H

OFF

MOD

VO L SQ

SW R A M

PW R PA

+10KHz
NB/ANL

FM

NB/ANL

OFF

MIC GAIN RF GAIN

MED

ECH OBRIGHT

+10KHz

OFFDIM

EC H O TIMEMIC

SW R RX / TX

1 234567 8 9

1. MICROPHONE JACK: Used to connect microphone for voice source.

2. ON/OFF VOLUME CONTROL: This knob controls the volume and power to the

radio. To turn radio on, rotate the knob clockwise. Turning the knob further will
increase the volume of the receiver.

3. SQUELCH CONTROL: This knob is used to eliminate background noise being
heard through the receiver, which can be disturbing when no transmissions are
being heard through the receiver. To use this feature, turn the knob fully
counterclockwise and then turn clockwise slowly until the background noise is just
eliminated. Further clockwise rotation will increase the threshold level which a
signal must overcome in order to be heard. Only strong signals will be heard at a
maximum clockwise setting.

4. MIC GAIN CONTROL: Adjusts the microphone gain in the transmit and PA
modes. This controls the gain to the extent that full talk power is available several
inches away from the microphone. In the Public Address (PA) mode, the control
functions as the volume control.

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