Galaxy dx77hml 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

AT3602014G

PD000907

DX−77HML

Full Channels with +10KHz

AM/FM/USB/LSB/PA

Mobile Transceiver with Roger Beep

OWNER’S MANUAL

TABLE OF CONTENTS

Page

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

Installation

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting the Connection . . . . . . . . . . . . . . . . . . . . . . 4

Ignition Noise Interference . . . . . . . . . . . . . . . . . . . . . 5

Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

External Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operation

Control Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Operating Procedure to Receive. . . . . . . . . . . . . . . . . 10

Operating Procedure to Transmit . . . . . . . . . . . . . . . . 10

Receiving SSB Signals . . . . . . . . . . . . . . . . . . . . . . . . 11

Roger Beep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Alternate Microphones and Installation . . . . . . . . . . . 13

Specifications

GENERAL

Frequency Range 28.065 to 28.505 MHz
Frequency Control Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance 0.005%
Frequency Stability 0.001%
Operating Temperature
Range
Microphone Plug-in dynamic; with push-to-talk

Input Voltage 13.8V DC nominal, 15.9V max, 11.7V

Size 2-3/8” (H) x 7-7/8” (W) x 9-1/4” (D).
Weight 5 Ibs.
Antenna Connector UHF, SO239
Meter Illuminated; indicates relative output

TRANSMITTER

Power output AM/FM Hight-7w, Mid-4w, Low-1w

Modulation High-and low-level Class B, Amplitude

Intermodulation
Distortion
SSB Carrier Suppression 55dB
Unwanted Sideband 50dB
Frequency Response AM and FM: 450 to 2500 Hz.
Output Impedance 50 ohms unbalanced.
Output Indicators Meter shows relative RF output power

-30°C to +55°C

switch and coiled cord.

min. (positive or negative ground).
Transmit: AM full mod., 4A.
SSB 21 watts PEP output, 6A
Receiver: Squelched, 0.6A
Maximum audio output, 1.2A

power, received signal strength.

SSB, 25 watts PEP.

Modulation: AM. Variable capacitance
Frequency Modulation: FM.
SSB: 3rd order, more than –25dB.

th

5

and SWR. Transmit LED glows red
when transmitter is in operation.

order, more than –35dB.

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RECEIVER

Sensitivity SSB: 0.25 3V for 10 dB (S=N)/N at

greater than ½-watt of audio output.
AM: 0.5 3V for 10 dB (S+N)/N at
greater than ½-watt of audio output.
FM: 1.0 3V for 20 dB (S+N)/N at
greater than ½-watt of audio output.

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

SSB: 6 dB @ 2.1KHz, 60 dB @ 3.3KHz.
Image Rejection More than 65 dB.
IF Frequency AM/FM: 10.695 MHz 1

nd

2

IF

st

IF, 455 KHz

SSB: 10695 MHz
Adjacent-Channel

60 dB AM/FM & 70 dB SSB
Rejection
Automatic Gain Control
(AGC)

Less than 10 dB change in audio output

for inputs from 10 to 100,000 microvolts.
Squelch Adjustable; threshold less than 0.5 3V.
ANL Switchable.
Noise Blanker RF type, effective on AM/FM and SSB
Clarifier Range

Coarse (TX/RX) ±5 KHz.

Fine (RX) ±1 KHz
Audio Output Power 4 watts into 8 ohms.
Frequency Response 300 to 2800 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 CONNECTION

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.

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