Galaxy dx73, Dx 73v User Manual

This radio is covered by a two
year limited parts and labor
warranty.

WARRANTY

• “Limited” means that we will repair problems caused by factory defects or
normal use at no charge.

• Before returning a radio to us for warranty service, please call our Service
Department for a Repair Authorization Number (RAN). This RAN must be
written below your return address on the outside of the shipping box. Boxes,
which arrive without a RAN, will be refused, and the shipping company will
return the unopened box to you. Be sure to have a pen and paper ready along
with the serial number of your radio before calling. We will give you the RAN
and our shipping address over the phone. The telephone number of the Service
Department is [phone], and we suggest calling between 10:00 AM and
4:00 PM Pacific Time.

• Please include a note with a detailed description of the symptoms. This is
important because it will help the technician who works on your radio to locate
your problem. Intermittent problems are easily overlooked, so be sure to give as
much detail as possible in your note. Also, please include your telephone number
in case our technicians have any additional questions.

• Do not send your power cord or microphone unless we ask for these items during
our telephone conversation.

• You are responsible for getting the radio safely to us. (We suggest using United
Parcel Service.) You must pay to ship the radio to us, and we will pay to ship the
radio back to you. Since we use UPS and they do not ship to Post Offices boxes,
please provide us with a street address for the return of your radio.

• We will repair and return your radio as soon as we can. We appreciate your
choosing a Galaxy radio and we want you to be on the air as much as possible!

Be sure to visit our web site at

www.GalaxyRadios.com

Printed In Malaysia

AT2101013T

PD000901

DX−73V

FULL FEATURED

AM/FM MOBILE TRANSCEIVER

OWNER’S MANUAL

TABLE OF CONTENTS

Page

Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Mounting the Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

Tuning the Antenna for Optimum SWR . . . . . . . . . . . 5

External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation

Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Specifications

GENERAL

Frequency Range 28.315 ~ 28.755 MHz
Channels 40 CH
Frequency Control Phase Lock Loop (PLL) synthesizer.
Frequency Stability 0.005%
Temperature Range -30 to +55
Input Voltage DC 13.8V
Size 2-3/8” (H) x 7-7/8” (W) x 9-1/4” (D).
Weight 5 Ibs. 8 oz.
Antenna Impedance 50 Ohms

TRANSMITTER

RF Power output 10W.
RF Transmit Modes AM/FM
Antenna Connector UHF Type, 50 Ohms
Audio Distortion 10%
Frequency Response 450 to 2500Hz
Spurious Emissions -50dB
Microphone Dynamic

RECEIVER

Sensitivity for 10dB S+N/N AM 1.0uV
Sensitivity for 20dB S+N/N FM 1.0uV
Squelch Sensitivity 0.5uV
Image Rejection -60dB
AGC Figure of Merit AM : 70dB for 50mV for 10dB

Audio Distortion @ 3W 10%

Change in Audio Output

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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 passengers in the vehicles. In
automobiles, the transceiver is usually mounted below the dash panel, with
the microphone bracket beside it.

MOUNTING THE RADIO

Your transceiver 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 connection to the chassis of the
vehicle. Proceed as follows to mount the transceiver:

1. After you have determined the most convenient location in your vehicle,

hold the transceiver with mounting bracket in the exact location desired.
If nothing will interfere with mounting it in the desired position, remove
the mounting bolts. Before drilling the holes, make sure nothing will
interfere with the installation of the mounting bolts.

2. Connect the antenna cable plug to the standard receptacle on the rear

panel. Most antennas are terminated with a type PL-259 plug and mate
with the receptacle.

3. Connect the red DC power input wire (with the fuse) to +13.8V DC.

This wire extends from the rear panel. In automobile installation,
+13.8V DC is usually obtained from the accessory contact on the
ignition switch. This prevents the set being left on accidentally when the
driver leaves the car and also permits operating the unit without the
engine running. Locate the accessory contact on most ignition switches
by tracing the power wire from the AM broadcast receiver in the car.

4. Connect the black lead to –13.8V DC. This is usually the chassis of the

car. Any convenient location with good electrical contact (remove paint)
may be used.

5. Mount the microphone bracket on the right side of the transceiver or

near the transceiver, using two screws supplied. When mounting in an
automobile, place the bracket under the dash so the microphone is
readily accessible.

IGNITION NOISE INTERFERENCE

Use of a mobile receiver at low signal levels is normally limited by the
presence of electrical noise. The primary source of noise in automobile
installations is from the generator and ignition system in the vehicle. Under
most operating conditions, when signal level is adequate, the background
noise does not present a serious problem. Also, when extremely low level
signals are being received, the transceiver may be operated with vehicle
engine turned off. The unit requires very little current and therefore will not
significantly discharge the vehicle battery.

Even though the transceiver has NB and NB+ controls, in same
installations ignition interference may be high enough to make good
communications impossible. The electrical noise may come from several
sources. Many possibilities exist and variations between vehicles require
different solutions to reduce the noise.

ANTENNA

A vertically polarized, quarter-wavelength whip antenna provides the
most reliable operation and greatest range. Shorter, loaded-type whip
antennas are more attractive, compact and adequate for applications where
the maximum possible distance is not required. Also, the loaded whips do not
present the problems of height imposed by a full quarter-wavelength whip.

Mobile whip antennas utilize the metal body of the vehicle as a ground
plane. When mounted at a corner of the vehicle they are slightly directional,
in the direction of the body of the vehicle. For all practical purpose, however,
the radiation pattern is nondirectional. The slight directional characteristic
will be observed only at extreme distance. A standard antenna connector
(type SO239) is provided on the transceiver for easy connection to a standard
PL 259 cable termination.

If the transceiver is not mounted on a metal surface, it is necessary to
run a separate ground wire from the unit to a good metal electrical ground in
the vehicle. When installed in a boat, the transceiver will not operate at
maximum efficiency without a ground plate, unless the vessel has a steel
hull.

Before installing the transceiver in a boat, consult your dealer for
information regarding an adequate grounding system and prevention of
electrolysis between fittings in the hull and water.

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