Galaxy DX 44HP Owner's Manual

Printed In Taiwan

P/N:A412308COA

DX 44HP

10 Meter Amateur Mobile Transceiver

OWNER’S MANUAL

TABLE OF CONTENTS

Page

Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Installation

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

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

4

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

5

Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

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

6

External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

Operation

Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

A. Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

B. Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

Press-To-Talk Microphone . . . . . . . . . . . . . . . . . . . . . .

11

Operating Procedure to Receive . . . . . . . . . . . . . . . . . .

11

Operating Procedure to Transmit . . . . . . . . . . . . . . . . .

11

Alternate Microphones and Installation . . . . . . . . . . . .

12

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .

18

Specifications

GENERAL

Frequency Range

28.015 to 28.465 MHz

Frequency Control

Phase Lock Loop (PLL) synthesizer.

Frequency Tolerance

0.005%

Frequency Stability

0.001%

Operating Temperature
Range

-20 C to +50 C.

Microphone

Plug-in dynamic; with push-to-talk switch and
coiled cord.

Input Voltage

Current

13.8V DC nominal, 15.9V max, 11.7V min.
(Positive or negative ground).

Transmit: AM/FM Hi Power _ 10A.
Receiver: Squelched, _ 0.3A.

Maximum Audio output, _ 0.7A.

Size

2-3/8” (H) x 7-7/8” (W) x 9-1/4” (D).

Weight

5.0 1bs.

Antenna Connector

UHF, SO239

Meter

Illuminated; indicates relative output power,
received signal strength and SWR.

TRANSMITTER

Power output

AM/FM – Variable; 10 watt maximum

Modulation

Modulation: AM. Variable capacitance 90%±
10%
Frequency Modulation: FM. 4KHz ±1KHz

Spurious Emissions

50 dB

Frequency Response

AM and FM: 300 to 2500 Hz.

Output Impedance

50 ohms, unbalanced

Output Indicators

Meter- shows relative RF output power.
Transmit LED glows red when transmitter is
in operation.

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RECEIVER

Sensitivity

AM: 0.5 V for 10 dB (S+N)/N at greater than
½ -watt of audio output.

FM: 1.0 V for 20 dB (S+N)/N at greater than
½ -watt of audio output.

Selectivity

AM/FM: 6 dB @ 3 KHz, 50 dB @ 9 KHz.

Image Rejection

More than 65 dB.

IF Frequency

AM/FM: 10.695 MHz 1st IF, 455 KHz 2nd
IF

Adjacent-Channel
Rejection

60 dB AM

RF Gain Control

45 dB adjustable for optimum signal
reception.

Automatic Gain Control
(AGC)

Less than 10 dB change in audio output for
inputs from 10 to 1,000mV.

Squelch

Adjustable; threshold less than 0.5 V.

ANL

Switchable

Noise Blanker

RF type

Audio Output Power

4 watts into 8 ohms.

Frequency Response

300 to 2500 Hz.

Built-in Speaker

8 ohms, round.

External Speaker (Not
Supplied)

8 ohms; disables internal speaker when
connected.

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 coax connector to the standard antenna connector on the

rear panel of the radio. Most antennas are terminated with a type PL-259
connector.

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

extends from the rear panel. In automatic 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.

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