Powerwerx DB-750X User manual

VHF/UHF
Dual Band Commercial Radio
Powerwerx DB-750X
User's Manual

Powerwerx offers the best in Land Mobile Commercial
Communications, featuring rugged mobiles and handhelds at
affordable prices. For additional information visit our web site:
www.powerwerx.com
NOTE
This commercial mobile radio ships from the manufacturer “Display Locked” per FCC rules.
You must have the RPS-DB750X-USB programming kit to unlock this radio for the rst time
of use. If you do not want to purchase this optional software, your radio dealer must rst
unlock this radio before regular use.
When programming this radio for the first time with the optional PC Programming kit, it
is recommended you rst READ the radio with software and then save this le for future
reference. In addition, after you READ this radio with software, rst make your programming
and frequency changes, then send this edited le back to your mobile radio. Please contact
the dealer you purchased this radio from or Powerwerx should you have any questions.

Caution
Please observe the following precautions to prevent fire,
personal injury, or transceiver damage:
Do not attempt to program your radio while driving.
Do not place this transceiver in a dusty, humid or wet area.
Do not expose this transceiver to long periods of direct
sunlight.
Do not mount this transceiver or
remote control head near vehicle
heating vents.
Do not transmit in the high power
mode for extended periods of time
as it may overheat the radio. For
longer transmit key downs, it is
recommended you use the “MID1”
or “MID2” medium power level
settings.
V/MHMSCN
LOW
LOWV/MHMSCN
SET
TV/SOL
Thank you for choosing this Powerwerx DB-750X Dual-Band
Land Mobile transceiver. This dual-band mobile is built to rugged
commercial radio standards and features 50 Watts power
output on VHF and 40 Watts output on UHF, seven character
alphanumeric display, AM “Air Band” receive, and direct–flow
heavy duty heat sink with thermostatically-controlled cooling fan
designed for years of trouble free operation.
The DB-750X dual-band radio offers four true dual receive
modes: (V+U, V+V, U+U and U+V). For simple operation this
radio also features single display mode to monitor one channel
at a time. The DB-750X includes 750 memory channels, 10
memory banks, full duplex operation, separate volume and
squelch controls, built-in CTCSS/DCS, DTMF signaling and
optional detachable remote front panel for flexible installation.
This dual-band radio is offered as a mobile or can be congured
as a base station using the optional SS-30DV Power Supply and
MBXCOVR Radio Enclosure.
This mobile transceiver includes a variety of features so we
recommend that you review this manual prior to using this radio.

CONTENTS
New and Innovative Features...................................................1
Frequency Range ...................................................................1
Supplied Accessories/Optional Accessories..........................2
Supplied Accessories..............................................................2
Optional Accessories ..............................................................2
Initial Installation .......................................................................3
Mobile Installation ...................................................................3
DC Power Cable Connection ..................................................4
Antenna Connection ...............................................................6
Accessories Connections........................................................7
Getting Acquainted ...................................................................8
Front Panel .............................................................................8
Rear Panel ..............................................................................9
Display ....................................................................................9
Microphone ...........................................................................10
Basic Operations.....................................................................11
Switching the Power On/Off..................................................11
Adjusting the Volume ...........................................................11
Switch Between VFO and Channel Mode............................. 11
Adjusting Frequency .............................................................11
Adjusting Channel.................................................................11
Switch Between Main Band and Sub Band ..........................12
Selecting the Frequency Band..............................................12
Receiving ..............................................................................12
Squelch Off/Squelch Off Momentary.....................................12
Transmitting ..........................................................................12
Shortcut Operations................................................................13
Squelch Level Setup .............................................................13
Transmit DTMF / 2-Tone / 5-Tone Signaling .........................13
High/Mid/Low Power Switch .................................................13
Frequency Reverse...............................................................13
Bandwidth Selection .............................................................13
Home Channel ......................................................................13
Hyper Memory Channel ........................................................13
Dual Watch............................................................................14
Emergency Alarm..................................................................14
Memory Channel/Frequency Scan .......................................14
Memory Channel Scan Skip .................................................14
Memory Channel Add ...........................................................14
Scan Range Limit .................................................................14
Memory Channel Copy .........................................................14
Memory Channel Delete .......................................................15
General Setting........................................................................16
APO (Automatic Power Off) ..................................................16
Automatic Offset ...................................................................16
Frequency Channel Step Setup............................................16
VFO Band Lockout................................................................17
Beep Function.......................................................................17
CPU Clock Frequency Change.............................................17
2-Tone Encode Select...........................................................17
5-Tone Encode Select...........................................................18
Additional Signaling Feature .................................................18
CTCSS Encode Setup .........................................................18
CTCSS Decode Setup ..........................................................19
Sub Band Display Setup .......................................................19
DTMF Encode Pre-Loading Time .........................................19
DTMF Encode Transmitting Time .........................................20
DTMF Encode Setup ............................................................20

Squelch Mode Setup.............................................................20
Compander ...........................................................................21
Scrambler Setup ...................................................................21
Tone Burst ............................................................................21
Keypad Mode Setup .............................................................22
Keypad Lockout ....................................................................23
TX OFF (PTT Lockout) .........................................................23
Squelch Level Setup .............................................................23
Frequency Reverse...............................................................23
Sub Band Mute Setup...........................................................24
Editing Channel Name ..........................................................24
Channel Function Auto Storage Setup..................................24
Microphone PA, PB, PC, PD Key Setup ...............................25
RF Squelch Level Setup .......................................................25
Offset Direction Setup...........................................................25
Scan Dwell Time Setup.........................................................25
Priority Channel Scan ...........................................................26
Offset Frequency Setup ........................................................26
Display Mode Setup..............................................................26
Busy Channel Lockout ..........................................................27
Radio's DTMF Self ID Enquiry ..............................................27
5-Tone Self ID Enquiry..........................................................27
TOT (Time-Out Timer)...........................................................27
VFO Frequency Linkage .......................................................28
Wide/Narrow Band................................................................28
Cross Band Repeat...............................................................28
LCD Backlight .......................................................................28
Keypad Backlight Brightness ................................................29
Calling Record ......................................................................29
AM Function..........................................................................29
Automatic AM Function .........................................................29
External Speaker Port...........................................................29
Beep Volume Control ...........................................................30
Talk Around........................................................................... 30
Microphone Speaker.............................................................30
Password Function ...............................................................30
Microphone Operation ............................................................31
Send DTMF Signaling...........................................................31
Main/Sub Band Switching .....................................................31
Function Operation through PA-PD Keys .............................31
Memory Banks.........................................................................33
Assigning Memory Bank to a Channel..................................33
Choosing Active Bank ...........................................................33
Bank Linking .........................................................................33
Cable Clone..............................................................................34
Reset to Factory Default .......................................................34
Maintenance.............................................................................35
Default Value for Factory Resume ........................................35
Trouble Shooting...................................................................35
Specications ..........................................................................36
Attached Chart.........................................................................37
51 groups CTCSS Tone Frequency (Hz) ..............................37
1024 groups DCS Code........................................................37
Menu Quick Reference List ....................................................39
CONTENTS
DB-750X

1
1
DB-750X FEATURES:
• 750 Memory Channels
• 10 Memory Banks (with bank linking)
• 7 Character Alphanumeric Display
• Power Output: VHF 50 Watts, UHF 40 Watts (4 power levels available for each band)
• Dual Receive Operation (V+U, V+V, U+U, U+V) with separate volume controls
• Narrow Band (2.5 kHz) operation for Land Mobile frequencies (FCC part 90)
• Wide Band (5.0 kHz) operation for Amateur frequencies
• Dual or Single Display / Receive Modes
• Large LCD Display with adjustable Colors and Brightness
• Built-in CTCSS/DCS per channel
• PC programmable with RPS-DB750X-USB Programming Kit
• Base Station Operation w/ optional Power Supply (SS-30DV) and optional Radio Enclosure (MBXCOVR)
Frequency Range
RX: 108~136 MHz AM TX: 136~143.995 MHz FM Narrow
136~174 MHz FM Wide or FM Narrow 144~147.995 MHz FM Wide
220~260 MHz FM Wide 148.000~174 MHz FM Narrow
350~490 MHz FM Wide or FM Narrow 400~429.995 MHz FM Narrow
430~449.995 MHz FM Wide
450~469.995 MHz FM Narrow
470~490 MHz FM Wide
Features

2
DB-750X
2
Supplied Accessories/Optional Accessories
SUPPLIED ACCESSORIES
OPTIONAL ACCESSORIES
After carefully unpacking the transceiver, identify the items listed in the table below. We suggest you keep the box and packaging.
Transceiver
Spare Fuses
(15 A)
User Manual
Front Panel Remote Kit
(MBXRMK)
Dual
Band Mobile Mag
Mount Antenna
(MBXGAIN)
Mobile Mounting
Bracket (MBXBRKT)
DC Power Cable with
Fuse Holder
(OEM-FM-CAB)
Microphone with DTMF
Keypad (MBXDTMF)
Plain Microphone
(MBXMIC)
S-Washer
4pcs
Hardware Kit for Bracket
Black screws
(M4X8mm)
4pcs
Tapping screws
(M5X8mm)
4pcs
Programming Kit
(RPS-DB750X-USB)
Cigarette Lighter Plug
Connection - 6 Feet
(TMCG-72)
Desktop
Microphone
(MBXDESK)
Power supply
(SS-30DV)
External Speaker
(MBXSPK)
V/MHMSCN
LOW
LOWV/MHMSCN
SET
TV/SOL
1
4
789
0#
56
23PA
MIC
PB
AB
A
A/B B
PC
PD
MAIN
Base Station Radio
Enclosure (MBXCOVR)
Includes Power Adapter (MBXRPA)
Power Line
Filter (LF-1-OEM)
Y Cable
(MBXYCBL)
Clone Cable
(MBXCLON)
LOWV/MHMSCN
SET
TV/SOL
V/MHMSCN
LOW
Power Adapter
(MBXRPA)
For a complete listing of current accessories see: www.powerwerx.com/mobile

3
3
MOBILE INSTALLATION
To install the transceiver, select a safe, convenient location inside your
vehicle that minimizes danger to your passengers and yourself while the
vehicle is in motion. Consider installing the unit at an appropriate position
so that knees or legs will not strike it during sudden braking of your
vehicle. Try to pick a well ventilated location that is shielded from direct
sunlight.
1. Install the mounting bracket in the vehicle using the supplied self-
tapping screws (4pcs) and at washers (4pcs).
2. Position the transceiver, then insert and tighten the supplied hexagon
SEMS screws.
Car body
Mounting bracket
Washer (M5)
Tapping screw
(M5X20mm)
• Double check that all screws are tightened to prevent vehicle
vibration from loosening the bracket or transceiver.
Initial Installation
• Determine the appropriate angle of the transceiver, using the 3
screw hole positions on the side of the mounting bracket.
LOW
V/MHMSCN
SET
TV/SOL
V/MHMSCN
LOW

4
DB-750X
3
Initial Installation
DC POWER CABLE CONNECTION
For best operation, connect directly to vehicle battery.
MOBILE OPERATION
The vehicle battery voltage must be between 11.5 ~ 14.5 Volts
DC. Be sure to use a battery that has sufficient current capacity.
If the current to the transceiver is insufficient, the display may
darken during transmission, or transmitting output power may drop
excessively.
1. Route the DC power cable supplied with the transceiver directly
to the vehicle's battery terminals using the shortest path from the
transceiver.
2. If using the supplied power cable make sure the entire length of
the cable is dressed so it is isolated from heat, moisture, and the
engine high voltage ignition system.
3. If using the optional Powerwerx TMCG-72 cigarette lighter plug
make sure your cigarette lighter socket in your vehicle can handle
12 VDC @ 12 Amps.
• Conrm the correct polarity of the connections, then attach
the power cable to the battery terminals; red connects to
the positive (+) terminal and black connects to the negative
(-) terminal.
• Use the length of cable nessary to reach your battery. In
particular, never remove the fuse holders from the cable.
4. Reconnect any wiring removed from the negative terminal.
5. Connect the DC power cable to the transceiver's power supply
connector.
• Press the connectors rmly together until the locking tab clicks.
Red
Black
DC power cable
NOTE

5
3Initial Installation
• Do not directly connect the transceiver to an AC outlet.
• Use the optional DC Power Adapter (MBXRPA) to connect
the transceiver to a regulated power supply.
• Do not substitute a cable with smaller gauge wires.
BASE STATION OPERATION
In order to use this transceiver for fixed base station operation,
you will need an optional SS-30DV DC power supply and optional
Base Station Enclosure (not included). Please contact your local
dealer for these items.
Before connecting the DC power to the transceiver, be sure to
switch the transceiver and the DC Power Supply OFF.
Do not plug the DC Power Supply into an AC outlet until you
make all connections.
Power Supply (SS-30DV)
DC Power Adapter
(MBXRPA)
Power Supply
(SS-30DV)
1. Connect the optional DC Power Adapter (MBXRPA) to the
regulated DC Power Supply and ensure that the polarities are
correct. (Red: positive, Black: negative).
2. Connect the transceiver's DC power connector to
the connector on the DC Power Adapter (MBXRPA).
Press the connectors rmly together until the locking tab clicks.
NOTE
Red
Black
Base Station Radio
Enclosure (MBXCOVR)
Includes Power Adapter (MBXRPA)
LOWV/MHMSCN
SET
TV/SOL
V/MHMSCN
LOW