Lectrosonics DHu User manual

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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
DHu
Digital Handheld Transmitter
Quick
Start
Guide
8 May 2019
U.S. Patent 7,225,135

LECTROSONICS, INC.2
Mechanical Assembly
The lower housing opens by rotating
it in the direction shown. After the
threads are disengaged, pull the
housing downward until it engages
the detent that holds it open.
A mic capsule is
threaded onto the body
of the transmitter in the
direction shown.
Do not overtighten it.
The threaded interface is a 1.25”
diameter opening with 28 threads
per inch and three contact rings
Microphone Capsules:
Lectrosonics offers two types of capsules. The HHC is the standard capsule
and the HHVMC is the Variable Mic Capsule which includes adjustments for
Bass, Midrange and Treble.
HHC Lectrosonics
cardioid electret
HHVMC Lectrosonics cardioid
electret with VariMic preamp
Along with these two models from Lectrosonics, a variety of different capsules
with a common thread and electrical interface are available from the major
microphone manufacturers.
A list of compatible capsules is on the website at www.lectrosonics.com listed
on the DHu product page.

www.lectrosonics.com 3
Do not touch the contacts between the mic capsule
and transmitter body. When necessary, the contacts
can be cleaned with a cotton swab and alcohol.
Capsule Installation
Capsules are attached with a right-hand thread.
To remove the windscreen from the mic capsule,
line up the blue wrench (included with the capsule head) with the flat notches
on the lower threaded area of the mic capsule.
Align flats on
the wrench
with flats on
the capsule.
Battery Installation
Close
eject lever
to install
batteries
To insert batteries, close the eject lever and
insert the upper contacts first (closest to the
mic capsule). Polarity is marked on the label
in the bottom of the battery compartment.
The contacts are very tight to prevent the
batteries from “rattling” as the transmitter is
being handled. Pull the eject lever outward
to remove the batteries. The battery tips will
move outward, making them easier to grasp.
Pull eject lever outward
to release batteries from
contacts

LECTROSONICS, INC.4
Control Panel
Six membrane switches on the control panel are used to set up the transmit-
ter by navigating the menus on the LCD and selecting the desired values.
Power Button
Modulation
LEDs
Previous
Screen
UP/DOWN Buttons for
Menu Item Selection
Enter Menu and
Select Item
IR Sync Port
Programmable switch
setup button
Setup and Adjustments
Powering On
Press and hold the Power Button until a status bar on the LCD is completed.
The status bar will appear on the LCD, followed by a display of the model,
firmware version, frequency band and compatibility mode.
DHu
V1.01
Hold
for
Rf On
When you release the button, the unit will be operational with the RF output
turned ON and the Main Window displayed.
5
623.400
-40 -20 0
AThe Main Window
RF output ON

www.lectrosonics.com 5
If you release the button before the status bar is complete, the unit will turn on
in the Standby mode with the RF output turned OFF and the antenna icon will
blink.
5
623.400
-40 -20 0
AMUTE The Main Window
RF output OFF
Powering Off
Press and hold the Power Button (or the side button if it is configured for
turning the power on and off) while the status bar on the LCD is completed.
The power will then be turned off. This can be done from any menu or screen.
Powering
O . . .
NOTE: If the Power Button is
released before the status bar has
completed, the unit will remain
turned on and the LCD will return
to the same screen or menu that
was displayed previously.
Standby Mode
A brief push of the keypad Power Button turns the unit on and places it into
a “standby” mode (not transmitting). Press the button and release before the
status bar completes. This allows the transmitter to be set up without the risk
of creating interference for other wireless systems that are operating in the
vicinity.
A notice will appear briefly confirming that the RF output of the transmitter is
turned off, followed by the Main Window. The antenna symbol will blink as a
reminder that the RF output is turned off.
5
623.400
-40 -20
0
AMUTE Symbol blinks
when RF output
is turned OFF
Rf
Off

LECTROSONICS, INC.6
Power Menu
Resume
Pwr Off
Rf On?
Backlit
When the transmitter is turned on, a brief push of the
Power Button on the keypad will reveal a menu allowing
you to choose between Resume, Pwr Off, Rf On?,
Backlit and About.
Use the UP/DOWN buttons to select one of the menu
items, then press the MENU/SEL button to confirm this
action.
• Resume: Continue operating in the same condition as before.
• Pwr Off: Turns off the transmitter.
• Rf On?: Begin transmitting the RF signal, enters another screen prompt-
ing a Yes or No answer.
• Backlit: The LCD includes a backlight that illuminates the display for
easier viewing. It is set to come on when any button on the control panel
is pressed, then stay on for 5 seconds, 30 seconds or to stay on all the
time.
• About: Displays the model, firmware version, frequency block and com-
patibility mode.
The unit can also be turned off from any menu or screen on the LCD by hold-
ing the power button in while the status bar on the LCD is completed.
Battery Condition
An icon on the Main Window indicates the approximate remaining power of
the batteries. This battery gauge is most accurate with the typical voltage drop
across the life of alkaline batteries.
Battery Gauge
5
623.400
-40 -20 0
A
Rechargeable batteries give little or no warning when nearing depletion. If
you use rechargeable batteries in the transmitter, we recommend trying fully
charged batteries first, noting the length of time that the batteries will run the
unit, and in the future using somewhat less than that time to determine when
the battery needs to be replaced. The Venue and other receivers from Lectro-
sonics offer a timer function to assist in this process.

www.lectrosonics.com 7
Navigating Menus and Screens
The Main Window displays the following information:
DHu
545.400
-40 -20 0
MUTE Icon indicates
whether RF output
is turned on or off
Battery condition
Operating
frequency in MHz
Audio level
Function of the
programmable
switch
1) Press the MENU/SEL button to enter the setup menu. Use the UP/DOWN
buttons to highlight the menu item.
2) Press the MENU/SEL button to enter the setup screen for that item. Use
the UP/DOWN buttons to select the desired value or mode.
Gain
Freq.
ProgSw
Rolloff
-40 -20 0
Gain
25
3) Press the MENU/SEL button to save this setting and return to the previ-
ous screen.
4) Press the BACK button to return to the Main Window.

LECTROSONICS, INC.8
Menu Map
SEL
BACK
Freq.
Select option with arrow buttons
Use arrow buttons
to select value
22
Gain SEL
BACK
Gain
Level meter at bottom of screen
Freq.
470.675
SEL
BACK
ProgSw
ProgSw
Power
SEL
BACK
Rolloff
Rolloff
50 Hz Select value with arrow buttons
SEL
BACK
Phase Normal
Invert
Phase
SEL
BACK
BatType Alk.
Lith.
BatType
Select value with arrow buttons
Select option with arrow buttons
Select option with arrow buttons
SEL
BACK
Default
Default
Settings
No
Yes
Select option with arrow buttons
SEL
BACK
KeyType
KeyType
Standard Select option with arrow buttons
SEL
BACK
TxPower
25 mW
50 mW
Select option with arrow buttons
TxPower
SEL
BACK
WipeKey
No
Yes
WipeKey?
Select option with arrow buttons
SEL
BACK
SendKey
SendKey
Share:
Press to send key
MENU
SEL
Press to highlight MHz or kHz
-40 -20 0
No Grp

www.lectrosonics.com 9
Gain
This setting is very important since it can have a significant effect on the
signal to noise ratio the system will deliver. The gain adjustment can even af-
fect the operating range of the wireless system. Gain must be set according to
the individual voice, the mic capsule in use and the handling technique of the
user. LEDs in the control panel facilitate accurate gain adjustment.
Gain
Freq.
ProgSw
Rolloff
-40 -20 0
Gain
25
IMPORTANT: See the section Input Gain Adjustment on page 9 for
details.
Freq.
The operating frequency is normally determined using the scanning function
in the receiver or with coordination software. The frequency is shown on the
transmitter LCD display in MHz and with a hexadecimal code that is used on
most Lectrosonics receivers.
Frequency groups are also able to be received via IR (Inrared) port sync.
The group options are set by the receiver, and will show at the bottom of the
screen as No Grp, Grp x, Grp w, Grp v, or Grp u.
Use the MENU/SEL button to toggle between options and UP and DOWN
arrows to adjust.
Freq
Grp x
628.200
Gain
Freq.
ProgSw
Rolloff
Frequency
Group
Frequency
ProgSw
The Programmable Switch on the housing can be set to provide several func-
tions, or it can be bypassed.
NOTE: See section on Programmable Switch Functions.
Functions:
(none)
Mute
Power
TalkBk
Cough
PTT
Gain
Freq.
ProgSw
Rolloff

LECTROSONICS, INC.10
Rolloff
A low frequency roll-off filter can be set for a -3dB point at 25, 35, 50, 70, 100,
120 or 150 Hz. Roll-off slopes are 12.2 dB/octave at 35 Hz and 10.1 dB/oc-
tave at 70 Hz through 125 Hz.
Gain
Freq.
ProgSw
Rolloff
Rolloff
70 Hz
The roll-off frequency is normally adjusted by ear to suit personal preferences.
Phase
The phase (polarity) of the audio can be inverted to match other microphone
capsules as needed.
TxPower
Phase
Rf On?
Default
Phase
Pos
Neg
BatType
Selects the type of batteries being used; alkaline or lithium.
Phase
BatType
TxPower
Default
BatType
Alk.
Lith.
TxPower
Output power can be set to 100 mW to extend operating range (which can
also suppress noise and dropouts to some extent) or set to 50 mW to slightly
extend the operating life of the batteries.
BatType
TxPower
Default
KeyType
TxPower
50 mW
100 mW