Lectronics DBu User manual

Digital Belt Pack Transmitter
DBu, DBu/E01
Quick
Start
Guide
Fill in for your records:
Serial Number:
Purchase Date:
This guide is intended to assist
with initial setup and operation of
your Lectrosonics product.
For a detailed user manual, down-
load the most current
version at:
www.lectrosonics.com
1 September 2022
Digital Hybrid Wireless®US Patent 7,225,135

LECTROSONICS, INC.2
DBu, DBu/E01 Features and Functions
USB Port
Belt clip
mounting hole
Belt clip
mounting hole
Battery
compartment
door
u
470.100
-40 -20 +0
DBu
Battery
status LED
Key verication
LED
Menu navigation
buttons
Power button
Return to
previous screen
PWR/FUNC
AUDIO
-20 -10
IR PORT
Modulation
Indicators*
Programmable
Function Switch
Audio
Input
Jack
Antenna
Port
IR Port

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DBu, DBu/E01 Features and Functions
Programmable Switch
The transmitter can also be congured as a “one button” device by
locking the ability to make changes with the keypad, and conguring
the top panel switch as either power on/o or a mute function.
Modulation Indicator LEDs
When the transmitter is set to MUTE, the -10 Modulation Indicators
LED will glow solid red. Otherwise, the -10 Modulation Indicators LED
will glow solid green when transmitter is on.
Belt Clips
The wire belt clip may be removed by pulling the ends out of the holes
in the sides of the case. Be sure to have a rm grip to avoid scratching
the surface of the housing.
An optional spring-loaded, hinged belt clip (model number BCSLEBN)
is also available. This clip is attached by removing the plastic hole cap
on the back of the housing and mounting the clip with the supplied
screw.
IR (infrared) Port
The IR port is available on the top of the transmitter for quick setup
using a receiver with this function available. IR Sync will transfer the
settings for frequency from the receiver to the transmitter.
Remove hole cap to
attach spring loaded
belt clip

LECTROSONICS, INC.4
Battery Installation
The transmitter is powered by two AA batteries. We recommend using
alkaline, lithium, or rechargeable batteries for longest life.
The battery status circuitry compensates for the dierence in voltage
drop between alkaline and lithium batteries across their usable life, so
it’s important to select the correct battery type in the menu.
Because rechargeable batteries run down quite abruptly, using the
Power LED to verify battery status will not be reliable. However, it is
possible to track battery status using the battery timer function avail-
able in the receiver.
Push outward on the battery compartment door and lift it to open.
Slide door out to release catch
Lift door to open
Insert the batteries according to the markings on the back of the hous-
ing.
If the batteries are inserted incorrectly, the door will close but the unit
will not operate.
The battery contacts can be cleaned with alcohol and a cotton swab,
or a clean pencil eraser. Be sure not to leave any remnants of the cot-
ton swab or eraser crumbs inside the compartment.

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Contact springs
Battery Status LED Indicator
Alkaline, lithium or rechargeable batteries can be used to power the
transmitter. The type of batteries in use are selectable in a menu on the
LCD.
When alkaline or lithium batteries are being used, the LED labeled BATT
on the keypad glows green when the batteries are good. The color
changes to red when the they are nearing the end of life. When the LED
begins to blink red, there will be only a few minutes remaining.
The Power/Function LED on the top panel will mirror the keypad LED
unless the programmable switch is set to Mute, and the switch is
turned on.
The exact point at which the LEDs turn red will vary with battery brand
and condition, temperature and power consumption. The LEDs are
intended to simply catch your attention, not to be an exact indicator of
remaining time.
A weak battery will sometimes cause the Power LED to glow green im-
mediately after the transmitter is turned on, but it will soon discharge to
the point where it will turn red or the unit will turn o completely.
Rechargeable batteries give little or no warning when they are depleted.
If you wish to use these batteries in the transmitter, the most accurate
way to determine runtime status is by testing the time provided by a
particular battery brand and type, then using the BatTime function to
determine remaining runtime.
NOTE: Refer to the Main Menu and Setup Section of your
manual for BatTime details.

LECTROSONICS, INC.6
Operating Instructions
Powering On in Operating Mode
Press and hold the Power Button for several seconds until a moving
bar on the LCD progresses.
Hold
for
Rf On 470.100
-40 -20 +0
DBu
Powering On in Standby Mode
A brief press of the Power Button , and releasing it before the mov-
ing bar progresses, will turn the unit on with the RF output turned o.
In this Standby Mode the menus can be browsed to make settings and
adjustments without the risk of interfering with other wireless systems
nearby.
Hold
for
Rf On
Release Power
Button before
the moving bar
progresses to
enter standby
mode
470.100
-40 -20 +0
DBu
RF indicator blinks
After settings and adjustments are made, press the power button again
to turn the unit o, or turn on the Transmit function by entering the
main menu, selecting Xmit, then RF On?
Powering O
Powering
O . . .
From any screen, power can be turned o by select-
ing Pwr O in the power menu, holding the Power
Button in and waiting for the moving bar to
progress, or with the programmable switch (if it is
congured for this function).
If the power button is released, or the top panel
switch is turned back on again before the moving bar
progresses, the unit will remain turned on and the LCD will return to the
same screen or menu that was displayed previously.
NOTE: If the programmable switch is in the OFF position, power can
still be turned on with the power button. If the programmable switch is
then turned on, a brief message will appear on the LCD.
When you release the but-
ton, the unit will be opera-
tional with the RF output
turned on and the Main
Window displayed.

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LCD Menu Map
NOTE: The
settings will be
stored when the
BACK button
is pressed.
DBu
Main Menu Tree
Rolloff
Input Gain Gain
22
Select option with arrow buttons
to select.
Select option with arrow buttons
to select.
to select.
Rolloff
70 Hz 1
Phase Phase
Freq.
Xmit Select Freq. in mHz or kHz with arrow buttons
to select.
Freq.
470.100
RF On?
Tx Power
Select option with arrow buttons
to select.
Select level with arrow buttons
Backlit
Backlit
On
30 Seconds
5 Seconds
Select option with arrow buttons
to select.
Bat Type
Bat Type
Alk.
Lith.
Select option with arrow buttons
to select.
Setup
LED Off LEDs
About
About
Select option with arrow buttons
to select.
DBu
V1.22
/2.00
Default Default
settings
Remote Select option with arrow buttons
to select.
No
Yes
Select option with arrow buttons
to select.
Remote
Enable
Ignore
On
Off
or to go back.
to get key.
to send key.
IR&Key
Select option with arrow buttons
to select.
Send Freq
Sync --->
Send Freq
Send All Send All
Get Freq Get Freq
Get All Get All
Select option with arrow buttons
to select.
Key Type Key Type
Standard
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
Locked? Yes
No
Select option with arrow buttons
to select.
Locked?
ProgramSw
TalkBk
Select option with arrow buttons
to select.
ProgSw
|-40 |-20 +0|


Wipe Key
Make Key?
No
Yes
Select option with arrow buttons
to select. Encrytion
key
ERASED
* This menu item is
only available in
Shared key mode. Send Key
Send Key
Send --->
Select option with arrow buttons
to select. IR
SYNC
OK

RF On?
Yes
No
TxPower
25 mw
50 mW
Sync --->
Sync --->
Sync --->
AutoOn? No
Yes
Select option with arrow buttons
to select.
AutoOn?
Select option with arrow buttons
to select.
Select option with arrow buttons
to select.
BACK
Normal
Invert

LECTROSONICS, INC.8
Main Menu and Setup Screen
Details
Entering the Main Menu
The LCD and keypad interface makes it easy to browse the menus and
make the selections for the setup you need. When the unit is powered
up in either the operating or the standby mode, press MENU/SEL on
the keypad to enter a menu structure on the LCD. Use the and ar-
row buttons to select the menu item. Then press the MENU/SEL button
to enter the setup screen.
-40 -20 0
Gain
25
The prompt in the upper right corner may display one or
both arrows, depending upon what adjustment can be
made. If the changes are locked, a small padlock symbol
will appear.
Main Window Indicators
The Main Window displays on/o status, talkback or audio mute status,
standby or operating mode, operating frequency, audio level and
battery status.
470.100
-40 -20 +0
DBu
MUTE
Frequency (MHz)
RF On/Off
Status
Battery status
Audio level
Audio Mute or
Talkback status
If the programmable switch function is set for Mute or Talkback, the
Main Window will indicate that the function is enabled.

www.lectrosonics.com 9
Menu Item Descriptions
Input
Gain
Gain can be set, from -7 to +44, by using the and arrow buttons.
Adjusting the Input Gain
The two bicolor Modulation LEDs on the top panel provide a visual indi-
cation of the audio signal level entering the transmitter. The LEDs will
glow either red or green to indicate modulation levels as shown in the
following table.
Signal Level -20 LED -10 LED
Less than -20 dB O O
-20 dB to -10 dB Green O
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 dB Red Red
NOTE: Full modulation is achieved at 0 dB, when the “-20” LED
first turns red. The limiter can cleanly handle peaks up to 30 dB
above this point.
It is best to go through the following procedure with the transmitter
in the standby mode so that no audio will enter the sound system or
recorder during adjustment.
1) With fresh batteries in the transmitter, power the unit on in the
standby mode (see previous section Powering On in Standby
Mode).
2) Navigate to the Gain setup screen.
-40 -20 0
Gain
25
3) Prepare the signal source. Position a microphone the way it will
be used in actual operation and have the user speak or sing at
the loudest level that occur during use, or set the output level of
the instrument or audio device to the maximum level that will be
used.

LECTROSONICS, INC.10
4) Use the and arrow buttons to adjust the gain until the –10
dB glows green and the –20 dB LED starts to icker red during
the loudest peaks in the audio.
5) Once the audio gain has been set, the signal can be sent through
the sound system for overall level adjustments, monitor settings,
etc.
6) If the audio output level of the receiver is too high or low, use
only the controls on the receiver to make adjustments. Always
leave the transmitter gain adjustment set according to these
instructions, and do not change it to adjust the audio output level
of the receiver.
Rollo (Low Frequency Roll-o)
The low frequency audio roll-o is adjustable to optimize performance
for ambient noise conditions or personal preference.
Low frequency audio content may be desirable or distracting, so the
point at which the roll-o takes place can be set to 20, 35, 50, 70, 100,
120 or 150 Hz.
Rolloff
70 Hz
Phase (Selecting Audio Polarity)
This setting allows for conguration for use with certain microphones,
or for setting custom parameters.
Phase
Normal
Invert
Xmit
Setting Frequency
Frequency (mHz and kHz) in can be set by using the MENU/SEL button
to choose mHz or kHz and the and arrows to adjust frequency.

www.lectrosonics.com 11
Tuning Groups
Tuning groups can be received via IR (Infared) port sync from a receiver.
The group frequencies are set by the receiver. The group names will be
displayed at the bottom of the screen as Grp x, Grp w, Grp v, or Grp u.
Use the MENU/SEL button to toggle between options and the and
arrow buttons to adjust.
Gain
Freq.
ProgSw
Rolloff
RF On?
Turn Rf o to preserve battery power while setting other transmitter
functions. Turn it back on to begin transmitting.. Use the and arrow
buttons to toggle and MENU/SEL to save.
TxPower
Allows the transmitter output power to be set as 25 or 50 mW. Use the
and arrow buttons to scroll and MENU/SEL to save.

LECTROSONICS, INC.12
KeyType
Univrsal
Note: If there is a key mismatch, the key verification LED will blink.
WipeKey
This menu item is only available if Key Type is set to Standard, Shared
or Volatile. Select Yes to wipe the current key and enable the DBu to
receive a new key.
WipeKey?
No
Ye s
SendKey
This menu item is only available if Key Type is set to Shared. Press
MENU/SEL to sync the Encryption key to another transmitter or receiv-
er via the IR port.
SendKey
Share:
Setup
ProgSw
(Programmable Switch Functions)
The programmable switch on the top panel can be congured using the
menu to provide several functions:
• (none) - disables the switch
• Mute - mutes the audio when switched on; LCD will display a
blinking “MUTE” and the -10 LED will glow solid red.

www.lectrosonics.com 13
• Power - turns the power on and o
• TalkBk - switches the audio output on the receiver to a dierent
channel for communication with the production crew. Requires a
receiver with this function enabled.
ProgSw
Power
Use the and
arrow buttons to
select the desired
function or disable
the switch
NOTE: The programmable switch will continue to operate whether or
not settings are locked.
Selecting Battery Type
The voltage drop over the life of batteries varies by type and brand.
Be sure to set the correct battery type for accurate indications and
warnings. The menu oers alkaline or lithium types.
BatType
Alk.
Lith.
If you are using rechargeable batteries, it is better to use the timer func-
tion on the receiver to monitor the battery life rather than the indicators
on the transmitter. Rechargeable batteries maintain a fairly constant
voltage across the operating time on each charge and stop working
abruptly, so you will have little or no warning as they reach the end of
operation.
Remote
Remote control “dweedle” tones from a smart phone can be used to
control the transmitter. This setting Enables or Disables it.
Locked?
The settings can be locked to prevent inadvertent changes being
made.

LECTROSONICS, INC.14
Locked?
Ye s
No -40 -20 0
Gain
25
A small padlock symbol will appear on adjustment
screens when changes have been locked.
When settings are locked, several controls and actions can still be
used:
• Settings can still be unlocked
• Menus can still be browsed
• Programmable switch still works (Mute, Talkback and On/O)
• Power can be turned o by using the programable switch if in
Power mode or by removing the batteries.
Backlit
Sets the screen backlight to be always on, on for 30 seconds or on for
5 seconds.
LED O
Turns all LEDs on or o.
Restoring Default Settings
This is used to restore the factory settings.
About
This shows version and rmware information.

www.lectrosonics.com 15
Whip Antennas
Because the transmitter tunes across such a broad frequency range,
it is best to use the appropriate antenna for maximum operation. Two
antennas are included with the transmitter, and are shipped from the
factory pre-cut and fully assembled. Each antenna covers three blocks.
Use the chart below to determine which antenna best ts your needs.
Frequency Cap
Band Block Range MHz Color Antenna
A1
470 470.100 - 495.600 Black AMM19
19 486.400 - 511.900 Black AMM19
20 512.000 - 537.500 Black AMM19
B1
21 537.600 - 563.100 Red AMM22
22 563.200 - 588.700 Red AMM22
23 588.800 - 607.950 Red AMM22