Galaxy 2527, dx2527 User Manual

TABLE OF CONTENTS

DX 2527

SPECIFICATIONS

INSTALLATION

OPERATION

................................................................

.............................................................

2

3

Introduction .................................................................... 6

Control & Connections …………………………………… 6

MANPRG

ENTMEM

CLARIFIER

SHF

LOCK

2527

SQUELCH VOLUME

Rear Panel Connectors …………………………………... 10

Microphone ………………………………………………… 11

PHONE

MODE

LSB

USB

AM

CW

FM

PA

Operation …………………………………………………... 11

Programming. ……………………………………………… 12

RX / TX

POWER

MICROPHONE

SWR

1

2

3

0

2

4

8

6

WATTS

ON

RF POWER

OFF

CALIBRATE

RF

M

0

N

O

O

I

D

T

U

L

10

A

20

30

100

40

90

9

80

50

SET

12

10

VOICE

ECHO

70

60

OVER

dB

1

+60

3

22

5

+40

7

+20

9

SIGNAL

ECHO

TIME

MAXMIN

MAXMIN

OFF

TALK BACK

TONE

ROBOT

R2

R3

R4

OFF

MIC RF

R.BEEP SPLIT

NB/ANL

DIM

SWR SCAN

CHANNEL

AM·FM·SSB·CW·PA

Amateur Base Station Transceiver

OWNER’S MANUAL

- 1 -

SPECIFICATION:

GENERAL

Frequency Range 28.0000 – 29.6999 MHz
Emission Types CW, FM, AM, USB, LSB
Frequency Control Phase-Lock-Loop Synthesizer
Frequency Tolerance 0.005%
Frequency Stability 0.003%
Temperature Range -30OC to +55OC
Antenna Impedance 50 Ohms
Antenna Connectors Standard SO-239 Type

Meter Function

AC Input Voltage AC 120V , 60 Hz

TRANSMITTER

RF Power Output 25W: USB, LSB. 10W: AM, FM, CW
Antenna Connectors UHF Type, 50 Ohms
AM Modulation Up to 100%
Clarifier Range ±1 KHz
Spurious Emissions -60dB
Carrier Suppression -60dB

RECEIVER

Sensitivity for 10dB S/N AM: 0.5uV
Sensitivity for 20dB S/N FM : 0.25uV
Sensitivity for 10dB S/N USB/LSB: 0.3uV
Adjacent Channel Rejection -60dB
Image Rejection Ratio -50dB

AGC Figure of Merit

Audio Output Power @ 10%
THD

(SPECIFICATIONS SUBJECT TO CHANGE W ITHOUT NOTICE.)

Meter #1: RF Output Power / Antenna SWR.
Meter #2: Received Signal Strength / MOD%

SSB//AM: 80 dB for 50mV
for 10 dB Change in Audio Output

2.5W

INSTALLATION:

Location/Connection

The transceiver should be placed in a convenient operating location

close to an AC power outlet and the antenna lead in cable(s).

The transceiver is powered with the AC power cord set. Proceed as

follows to complete all necessary connections to the transceiver.

1. Your transceiver has standard antenna connectors of type SO-239

both located on rear panel; for easy connection to standard PL-

259 coax plugs. If the coax antenna cable must be made longer,

use coax cable with impedance of 50 ohms and use only enough

cable to suit your needs. This will insure a proper impedance

match and maximum power transfer from the transmitter to the

antenna.

2. AC Power Operation: Use 120 volts AC.

Noise Interference

There are several kinds of noise interference you may encounter in

fixed operation. Some of these noise sources are; fluorescent buzz,

nearby commercial broadcast, electrical appliance, lawnmower, and

electrical storms, etc. Commercial products are available to reduce

interference from these sources. Consult your dealer or professional

amateur radio supply shops.

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- 3 -

Antennas

Antennas are purchased separately and include installation

instructions. Numerous type of antennas are available that range from

emphasis on easy of installation to emphasis on performance. Often

the difference in performance between many of the antenna is

modest.

1. Vertical Ground Plane Antennas:

These are omni-directional antennas that provide optimum

performance for contacting other fixed stations using vertical type

antenna in addition to all mobile stations. For medium to long

range communications work.

2. Directional Beam Antennas:

Highly efficient and directional antennas generally intended for

fixed-to-fixed very long-range communications.

Remote Speaker

The external speaker jack (EXT. SP.) on the rear panel is used for

Public address

An external 8 ohms, 3-Watt speaker must be connected to the PA

jack located on the rear panel when the transceiver is used as a public

address system. The speaker should be directed away from the

microphone to prevent acoustic feedback. Physical separation or

isolation of the microphone and speaker is important when operating

the PA at high output levels.

remote receiver monitoring. The external speaker should have 8

ohms impedance and be able to handle at least 3 watts. When the

external speaker is plugged in, the internal speaker is disconnected.

Note: The PHONE jack on the front panel overrides both external

and internal speakers. When the plug from a headphone is plugged

to the PHONE jack, both internal and external speakers are silenced

simultaneously.

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OPERATION:

32

30

28

26

29

27

25242334

31

33

RX / TX

POWER

ON

OFF

MICROPHONE

CALIBRATE

RF

SWR

1

2

0

3

2

4

10

8

6

WATTS

ECHO

SET

22

12

ECHORF POWER

MIN
OFF

TONE

ROBOT

VOICE

0

10

20

30

1

3

5

TIME

MAX MIN MAX

TALK BACK

R2

R3

R4

OFF

M

N

O

O

D

I

T

U

A

L

100

40

90

50

9

80

60

70

OVER

dB

+60

+40

7

+20

9

SIGNAL

R.BEEPNB/ANL SPLIT PRG MAN SHF

SWR

DIM SCAN MEM

CHANNEL

MIC RF

ENT LOCK

CLARIFIER

SQUELCH

2527

VOLUME MODE

AM CW

FM PA

PHONE

USB

LSB

1

102345678

21

19

17

15

13

11

9

22

20

18

16

14

12

INTRODUCTION

This section explains the basic operating procedures for the DX
2527 amateur band base station transceiver.

CONTROL & CONNECTIONS:

1.

POWER ON/OFF CONTROL:

the unit.

2.

MICROPHONE JACK:

Used to connect microphone for voice

source.

3.

RF POWER CONTROL:

This control adjusts the RF power

output level.

4.

CALIBRATE CONTROL:

this control while transmitting until the needle on the left meter
goes to the small red “notch” on the SWR scale. (You may need
to be at maximum power in AM, FM or CW to reach the “SET”

Push ON to apply power to

To check your SWR, simply rotate

mark.) Then, while still transmitting, push the small white SWR
switch (number 11). This will give you an SWR reading. When
you are finished, be sure to turn the calibrate control. Fully CCW
to the “RF” position so you are able to read your RF output
power. You will hear the “RF” switch click on.

5.

ECHO:

This control is used to the amount of echo. This is a
switched pot that must be on along with switch number 6 for the
ECHO to operate.

6.

ECHO/VOICE/ROBOT SWITCH:

This switch selects between
the ECHO, VOICE CHANGER and ROBOT sound effects. In the
ECHO position, the ECHO control pot must also be on. The
ECHO sound is controlled by the ECHO pot and the TIME pot. In
the VOICE position, the TIME pot controls the pitch of the voice.
In ROBOT 1, 2, 3 or 4 none of the sound are adjustable. They are
fixed. In order to have all sound effects off, turn this switch to
ECHO and turn the ECHO pot off.

7.

TIME:

This control sets the time delay of the ECHO repetitions
in the ECHO modes. In the VOICE CHANGER mode, this pot
controls the pitch of your voice. Fully left (CCW) raises the pitch
of your voice. Fully right (clockwise) lowers the pitch of your
voice.

8.

TALK BACK:

This is a switched pot that controls the volume of
the talkback sound. It does not affect the sound your transmitting.
You can turn the talkback off (Fully CCW) or adjust the volume
as you desire. This talkback circuit can be used anytime – even
without any sound effects. Please note that this particular main
PC board does not allow much of a talkback signal. Therefore,
even if you have this control up to maximum, the talkback will
not be very loud.

9.

RF GAIN CONTROL:

the RF amplifier under strong signal conditions.

This control is used to reduce the gain of

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10.

MIC GAIN CONTROL:

This control adjusts the microphone
gain in the transmit mode. This feature is designed for use in a
high-ambient noise environment or to maximize talk power.

11.

SWR SWITCH:

12.

CHANNEL SELECTOR:

This switch is used to check SWR.

This control is used to select a

desired frequency.

13.

SCAN SWITCH:

This switch is used to scan frequencies in
each band segment. The operation section of this manual provides
detailed information on using the scan control.

14.

CLARIFIER CONTROL:

Allows variation of the receiver
operating frequency above and below the selected frequency.
Although this control is intended primarily to tune in SSB signal,
it may be used to optimize AM/FM signals as described in the
operating procedure paragraph.

15.

MEMORY SWITCH:

This is used to program memory

channels.

16.

SQUELCH CONTROL:

This control is used to control or
eliminate receiver background noise in the absence of incoming
signal. For maximum receiver sensitivity, it is desired that the
control be adjusted only to the point where the receiver
background noise is eliminated. Turn fully counterclockwise,
then slowly clockwise until the receiver noise disappears. Any
signal to be received must now be slightly stronger than the
average received noise. Further clockwise rotation will increase
the threshold level that a signal must overcome in order to be
heard. Only strong signal will be heard at a maximum clockwise
setting.

17.

ENTER SWITCH:

This is used to program frequencies into

memory.

18

VOLUME:

Permits you to adjust the listening level when

receiving.

19.

LOCK SWITCH:

This switch is used to lock a selected

frequency.

20.

MODE CONTROL:

This control allows you to select one of

six following operating modes FM/AM/LSB/USB/CW/PA.

21.

DOWN SWITCH:

•

This switch is used to move frequency

downward to select a desired frequency.

22.

PHONE JACK:

23.

RF/SWR METER:

Used to connect earphone to listening.

This meter operates during transmit only. It

reads power output or SWR.

24.

SIGNAL/MODULATION METER

: This meter indicates
signal strength of incoming signals during receive and your
percentage of modulation when transmitting in the AM.
Modulation readings are most accurate when using maximum
output power. The modulation meter does not work at all in FM
or SSB.

25.

DIM SWITCH:

This switch adjusts the display backlighting

in four different steps to best match environment.

26.

NB/ANL SWITCH:

The noise Blanker is very effective in
eliminating repetitive impulse noise such as ignition interference.
In the ANL position, the automatic noise limiter is active.

27.

ROGER BEEP SWITCH:

When this switch is placed in the
ROGER BEEP position, the radio automatically transmits an
audio tone at the end of your transmission so that people who are
having trouble hearing you will know that you are done speaking.
As a courtesy to others, use the Roger Beep only when necessary.

28.

SPLIT SWITCH:

This switch enables you to split operating

frequency for FM repeater operation.

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- 9 -

29.

PROGRAM SWITCH:

This switch is used to program

operating or scanning frequency into memory.

30.

FREQUENCY COUNTER:

The frequency counter indicates

the frequency of operation.

31.

MANUAL SWITCH:

This is used to return to the manual

mode.

32.

SHIFT SWITCH:

100KHz or 1MHz frequency steps.

22.

UP SWITCH:

•

This is used to select 100Hz, 1KHz, 10KHz,

This switch is used to move frequency upward

to select a desired frequency.

23.

RX/TX LED:

This LED is green during receive and changes to

red while transmitting.

REAR PANEL CONNECTOR:

1.

ANTENNA:

PL-259 type plug.

2. PA SP:

operation. Before operating PA you must first connect a PA
speaker to this jack.

87

654321

This jack accepts 50 Ohm coaxial cable with a

Used to connect a PA speaker (8 Ohm 4w) for PA

3.

EXTERNAL SPEAKER:

This jack accepts 4 to 8 ohms, 5-watt
external speaker. When the external speaker is connected to this
jack, the built-in speaker will be disabled.

4.

CW KEY:

This is used for Morse Code operation. To operate
this mode, connect a CW key to this jack and place the mode
switch in the CW position.

5.

FUSE:

Accommodates a fuse for AC input circuit protection.

Use 125V/7A fuse for replacement.

6.

AC POWER CORD:

Connects to AC power outlet for AC

mains supply.

7.

FREQUENCY COUNTER JACK:

The RCA-type jack
provides a signal used by some frequency counters so you can
read the frequency digitally. This readout signal operates on
transmit only.

8.

RECODDING OUTPUT JACK:

The RCA-type jack provides
output for connection to a tape recorder to permit recording of
receiver signals or you modulating voice.

MICROPHONE:

1.

PTT SWITCH:

the transmit and receive of the radio. Push to transmit and
release to receive.

2.

REMOTE UP/DOWN SWITCH:

be stepped up or down simply by pushing either of these
buttons.

Use the Push-To-Talk (PTT) switch to control

An operating frequency can

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- 11 -

OPERATION PROCEDURE

Frequency Selection

Frequency selection for the

DX 2527

operating frequency by rotating the Frequency selector or using the

UP/DOWN
LOCK

frequency selector and the
microphone. Repressing the
Use the

buttons on the top of the microphone. Press the

button to lock the selected frequency. This will disable the

UP/DOWN

LOCK

button to set the step frequency in 100Hz, 1KHz,

SHF

10KHz, 100KHz or 1MHz increments. The frequency step is
indicated by a small triangle directly under the corresponding digit
on the frequency display.

Mode Selection

To select an operating mode on your

MODE

position. The

selector, and place it in the desired operating mode

switch on the microphone controls the transmit

PTT

and receive of your radio.

RF Power Control

This control adjusts the power output continuously from 1 to 25
watts, on SSB and from 0.25 to 10 watts on AM.

PROGRAMMING

Frequency Selection

Frequency selection in the radio can be accomplished using any
three of the following methods:

1. The first method of frequency selection I through the use of the
key and the UP and

SHF

press the

button until the cursor arrow is position under

SHF

DOWN

the digit of the frequency that is to be changed. Then use the UP
arrow to increase the number. If a decrease in frequency is
desired, press the

DOWN

arrow. Perform the steps described
above for each digit of the frequency until the desired frequency
is displayed in the

display windows.

LCD

is simple. Select the desired

buttons on the top of the

button unlocks the frequency.

DX 2527

, simply rotate the

arrows. To accomplish this,

2. The second method of frequency selection is accomplished
using the
the front panel. Use the

button and the channel select knob located on

SHF

button in the manner described

SHF

above to select the digit to be changed. Then proceed to rotate
the channel selector knob clockwise to increase the frequency.
Rotate the channel select knob counterclockwise to decrease
the frequency.

3. The third method of selecting he operating frequency of the
radio is through the use of the
and

DOWN

buttons located on the microphone. Frequency

button and the channel

SHF

selection by this method is accomplished in the same manner
as with the UP and

DOWN

arrows on the keypad. The only
difference is that the channels UP and DOWN buttons on the
microphone are used.

Once a signal has been detected on a particular frequency, It may
be necessary to slightly change the frequency to provide the best
audio through the speaker. This can be accomplished by rotating
the clarifier control to vary the frequency by ±0.5 KHz. After this
fine-tuning has been accomplished, press the LOCK button to
lock in the frequency at the point of best reception.

Receive Scanning

The receive scanning feature allows you to locate active
frequencies in the entire band segment. To begin scanning,
slowly turn the squelch control clockwise until the receiver noise
disappears. Next, press the

SCAN

button. The unit should start

scanning from the lower to the higher frequency. Pressing the

SCAN

the

button again will change the direction of scanning. When

SCAN

button is pressed

"SCAN+"

or

"SCAN-"

will be
displayed on the LCD display. The scan will stop on any active
frequency for the duration of the transmission. When the
transmission stops, the

DX 2527

will wait approximately 2
seconds before it resumes scanning. If you want to deactivate
Scan mode while it's scanning, press the

(manual) button

MAN

UP

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or turn the Squelch control counterclockwise until you hear the
receiver noise. The
(See Frequency Scanning for more information.)

button will disable the Scan function.

MAN

Split Function

This function enables you to split the transmit and receive
frequencies for FM repeater operation. To split frequencies, press
the
frequency. If you want - split frequency, press the

button and the

MAN

SPLIT

button to select + split

SPLIT

button
again. If + split is selected, the transmit frequency will be higher
than the receiver frequency. If - split is selected, it will be lower
than the receive frequency. (See Offset Frequency Operation for
more information.)

Memory Function

The DX 2527 can store up to 10 channels (from 0 to 9). To
program a frequency into memory, follow the procedure
described below:

1. Press the

2. Press the

3. Press the

on the left-hand side of the LCD display. Pressing the
button will advance the memory number from

4. Select the desired frequency you wish to store in memory.

5. Press the

MAN

PRG

MEM

ENT

button.

button.

button. (

button.

"MEMORY"

and

should appear

"0"

to

"0"

"9"

MEM

.)

6. Repeat the procedure to program other memory channels.

Memory Channel Scanning

You can scan and select any of the 10-programmed frequencies
by following the procedure described below:

1. Press

MAN

button.

2. Press the

MEM

button.

3. Slowly turn the Squelch knob clockwise until the receiver
noise disappears.

4. Press the

SCAN

button. The unit will scan from lower to
higher frequencies. Press again, the unit will scan from higher
to lower frequencies.

5. To stop scanning a certain channel, press the

MAN

button, or
turn the Squelch knob counterclockwise until you hear the
receiver noise.

Metering

The meter built into your

DX 2527

on the left hand side of the

LCD display provides the following information:

1.

RF/SWR METER:

This meter operates during transmit

only. It indicators power output or SWR.

2.

S/MOD METER:

This meter indicates incoming signal
strength during receive and your modulation percentage while
transmitting on AM. Modulation indications are most accurate
at maximum AM output. There is no reading while transmitting
on FM or SSB.

Frequency Scanning

Frequency scanning can be achieved using one of two methods:
the first method involves scanning of pre-programmed memory
channels; the second method will permits the user to scan all
frequencies between a pre-set upper and lower scan limit. Both
methods of frequency scanning follow.

All-Frequency Scanning

To allow all Frequency scanning, one must first program the
upper and lower scanning limits. The scan limits are simply the
highest and lowest frequencies that will be scanned. To program
these limits, perform the following steps:

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1. Press the

2. Press the

(Program) button.

PRG
SCAN

button. (

"PRG SCAN+"

should appear in

the lower right corner of the display window.)

3. Using the
the upper scan limit, then press

4. Press the

button and UP and

SHF

SCAN

button again. (

DOWN

.

ENT

"SCAN-"

arrows, select

should appear in

the display window.)

5. Using the
the lower scan limit, then press

button and UP and

SHF

ENT

DOWN

.

arrows, select

The upper and lower scan limits have now been programmed.
To activate the scan feature, return the radio to manual
operation and press the

"SCAN+"

upper limit. If

, the radio will scan from the lower limit to the

"SCAN-"

SCAN

is displayed, the unit will scan from
the upper limit to the lower limit. To change from
to

"SCAN-"

NOTE: When programmed, the upper and lower scan limits will also act
the upper and lower operating limits of the radio. The radio cannot now
be programmed to operate above or below the scan limits.

or vice versa, press

button. If the display shows

"SCAN+"

SCAN

.

Memory Scanning

The DX 2527 has 10 non-volatile (i.e., memory resident)
memory locations that can be programmed with any available
frequency within the operating band of the radio. The scan
function of the unit can be programmed to scan these memory
channels. The radio will then scan only those memory channels
that have been pre-programmed.

The first step in utilizing the memory scan function is to
program the desired frequency into the radio memory. This can
be accomplished by performing the following steps:

1. With the radio operating in the manual mode, press the

(Program) button.

PRG

2. Press the

MEM

button.

"PRG"

should be display in the
lower right-hand corner of the LCD display window. In the
upper left portion of the display,
displayed. Directly below

, a number between 0 and

MEM

"MEM"

should be

9 will be displayed. This number represents the memory
location currently being displayed. Pressing the

MEM

key
will increase the memory counter to the next memory
location and the contents of that memory location will be
displayed.

3. Using the

button and UP and

SHF

DOWN

arrows, enter
the frequency to be stored in the memory location
displayed. After the desired frequency has been entered,
press

ENT

.

4. Repeat steps 2 and 3 for all of the memory locations to be
programmed.

5. After the desired memory locations have been programmed
with frequencies, return the unit to the manual mode of
operation by pressing the
To initiate memory scanning, press

6.

SCAN
"SCAN+"

. As previously discussed, the display will show

or

"SCAN-"

button.

MAN

and then press

MEM

to indicate whether the radio is
scanning from the lowest to the highest memory location or
vice versa. To return the radio to normal (non-scanning)
operation, press the

MAN

button.

Offset Frequency Operation

The DX 2527 has an offset or split frequency feature that will
permits the radio to be operated in a half-duplex mode. This
will allows the user to talk on FM repeaters operating in the 10
meter band. This split frequency function offsets the

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- 17 -

transmitter frequency either above or below the receive
frequency by a user programmable amount. In the following
example, programming of a 100 KHz offset will be described.
Before attempting to program the offset frequency, ensure that
the radio is operating in the manual mode by pressing the

button.

MAN

1. Press the

2. Press the
display

"00000"

(Program) button.

PRG

SPLIT

button. The LCD display window will

with

"PRG"

and

"SPLIT"

being

displayed in the lower left-hand corner.

3. Using the
described earlier, program the display to read

4. Press

ENT

button and the UP and

SHF

DOWN

arrows as

"01000"

.

. A 100 KHz offset has now been programmed

into the radio.

5. Return the radio to manual operation by pressing the

MAN

button.

6. Using the

button and the UP and

SHF

DOWN

arrows as
described previously, set the radio for the desired receive
frequency.

7.

Press

SPLIT

either

"SPLIT+"

KHz above the receive frequency when keyed. If

is displayed, the transmitter will be offset 100 KHz

"

below the receive frequency.

NOTE: When the transmitter is keyed, the frequency display will change
to show the frequency being transmitted.

. In the lower right corner of the display,

"SPLIT+"

or

"SPLIT-"

will be displayed. If

is displayed, the transmitter will be offset 100

"SPLIT-

WARRANTY

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

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ATTURO010J

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