Lectrosonics DHu Bedienungsanleitung

Rio Rancho, NM, USA

www.lectrosonics.com

INSTRUCTION MANUAL

DHu

Digital Handheld Transmitter

DHu

LECTROSONICS, INC.

Consumer Alert for US Users - FCC Order DA 10-92

Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone

system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at

a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device.

Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules

are subject to change. For more information, call the FCC at 1-888- CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC’s

wireless microphone website at www.fcc.gov/cgb/wirelessmicrophones. To operate wireless microphone systems at power

greater than 50mW, you must qualify as a Part 74 user and be licensed. If you qualify and wish to apply for a license go to:

http://www.fcc.gov/Forms/Form601/601.html

CAUTION

Danger of explosion if battery is incorrectly replaced.

Replace only with the same or equivalent type.

Table of Contents

General Technical Description ............................................ 3

Microphone Capsules: ......................................................... 4

Mechanical Assembly .......................................................... 4

Battery Installation ............................................................... 5

Control Panel ........................................................................ 5

Setup and Adjustments ....................................................... 6

Powering On ....................................................................... 6

Powering Off ....................................................................... 6

Standby Mode..................................................................... 6

Power Menu ........................................................................ 6

Battery Condition ................................................................ 7

Navigating Menus and Screens .......................................... 7

Menu Map .............................................................................. 7

Input Gain Adjustment......................................................... 9

Firmware Update ................................................................ 10

Parts and Accessories ....................................................... 12

Troubleshooting.................................................................. 13

Speciﬁcations ..................................................................... 14

Service and Repair ............................................................. 15

Returning Units for Repair ................................................ 15

Digital Hand Held Transmitter

Rio Rancho, NM 3

General Technical Description

Introduction

The DHu handheld transmitter delivers superb audio

quality and extended operating range in a pure digital

architecture. Interchangeable microphone capsules

expand the versatility to suit a wide variety of applica-

tions and personal preferences. The superb audio per-

formance and highly reliable RF transmission makes it

ideally suited for high end stage and studio production.

Frequency Selection

The transmitter tunes continuously from 470.100 to

607.975 MHz in 25 kHz steps, making it easy to ﬁnd

clear operating frequencies. Operating frequency is

normally selected using a receiver or analyzer to as-

sess signals in the local environment to avoid interfer-

ence. Once an interference-free frequency is identiﬁed,

the transmitter frequency is set to match the receiver.

Input Gain Range and Limiter

45 dB range of input gain adjustment allows gain

settings to accurately match the user’s voice and the

varying sensitivity of different microphone capsules. A

DSP-controlled analog audio limiter is employed be-

fore the A-D converter. The limiter has a range of more

than 30 dB for excellent overload protection. A dual re-

lease envelope makes the limiter acoustically transpar-

ent while maintaining low distortion. It can be thought

of as two limiters in series, a fast attack and release

limiter followed by a slow attack and release limiter.

The limiter recovers quickly from brief transients, with

no audible side effects, and also recovers slowly from

sustained high levels to keep audio distortion low while

preserving short term dynamics.

Long Battery Life

Switching power supplies throughout the design al-

low over 5 hours of operation using two alkaline AA

batteries. The battery compartment and contacts are

designed to prevent “rattle” as the unit is handled.

Menu-Driven Control

A high-resolution LCD and control panel with mem-

brane switches provide access to the menu-driven

setup. Transmitter RF power, low frequency rolloff,

frequency selection, backlight timeout settings and

programmable switch functions are easily accessed.

Antenna

A newly designed helical antenna allows the transmit-

ter to be held in any position, since the user’s hands

have little or no effect on the RF output power.

Microphone Capsules

The transmitter is available from Lectrosonics with the

HHC cardioid condenser capsule. Capsules from sev-

eral other manufacturers with a 1.25” x 28 thread pitch

and three contact rings are also available for use with

the transmitter. Condenser or dynamic microphone

heads can be used with the transmitter, depending on

the user’s preference or the application.

Side Button Functions

A programmable switch on the side of the housing can

be conﬁgured as a mute/cough switch, a power switch,

or be disabled.

USB Port for Firmware Updates

Firmware updates are enabled by simply downloading

a ﬁle and utility program from the Lectrosonics web

site, connecting the transmitter to a computer via the

USB port and running the program.

DHu

LECTROSONICS, INC.

A mic capsule is

threaded onto the body

of the transmitter in the

direction shown.

Do not overtighten it.

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.

The threaded interface is a 1.25”

diameter opening with 28 threads

per inch and three contact rings

Mechanical Assembly

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 the same 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 HH transmitter page.

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.

*All product names are trademarks of their respective

owners, which are in no way afﬁliated with Lectrosonics.

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.

Digital Hand Held Transmitter

Rio Rancho, NM 5

Battery Installation

To insert batteries, close the eject lever and insert the

upper contacts ﬁrst (closest to the mic capsule). Polar-

ity is marked on the label in the bottom of the battery

compartment.

eject lever

to install

batteries

To remove the batteries, pull the eject lever outward.

The battery tips will move outward, making them

easier to grasp.

Pull eject lever outward to release batteries from contacts

The contacts are very tight to prevent the batteries

from “rattling” as the transmitter is being handled.

Control Panel

Six membrane switches on the control panel are used

to set up the transmitter by navigating the menus on

the LCD and selecting the desired values.

Power Button

Side Button

Setup Switch

Modulation

LEDs

Screen

UP/DOWN Buttons for

Menu Item Selection

Enter Menu and

Select Item

IR Sync Port

DHu

LECTROSONICS, INC.

Standby Mode

A brief push of the Power Button turns the unit on and

places it into a “standby” mode (not transmitting). 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 out-

put 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.

DHu

545.400

-40 -20 0

Symbol blinks

when RF output

is turned OFF

Off

Power Menu

Resume

Pwr Off

Rf On?

Backlit

When the transmitter is turned on, a

brief push of the Power Button 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.

• Resume: Continue operating in the same condi-

tion as before.

• Pwr Off: Turns off the transmitter.

• Rf On?: Begin transmitting the RF signal, enters

another screen prompting a Yes or No answer.

• Backlit: The LCD includes a backlight that illu-

minates the display for easier viewing. It is set to

come on when any button on the control panel is

pressed, then stay on for either 30 seconds or 5

minutes, or to stay on all the time.

• About: Displays the model and ﬁrmware versions

of the microcontroller and FPGA.

The unit can also be turned off from any menu or

screen on the LCD by holding the power button in for

the duration of the countdown.

Setup and Adjustments

Powering On

Press and hold the Power Button for several seconds

until a countdown on the LCD is completed. The

countdown from 1 through 3 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

...3

When you release the button, the unit will be opera-

tional with the RF output turned ON and the Main

Window displayed.

DHu

545.400

-40 -20 0

The Main Window

RF output ON

If you release the button before the countdown is com-

plete, the unit will turn on in the Standby mode with the

RF output turned OFF and the antenna icon will blink.

DHu

545.400

-40 -20 0

The Main Window

RF output OFF

Antenna icon

blinks

Powering Off

Press and hold the Power Button (or the program-

mable button if it is conﬁgured for power on/off) for

several seconds and observe the LCD countdown

progress from 3 to 1. 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

countdown is completed, the

unit will remain turned on

and the LCD will return to the

same screen or menu that

was displayed previously.

Digital Hand Held Transmitter

Rio Rancho, NM 7

Menu Map

The menu is simple and intuitive. A summary of the

available settings is shown here, and details of the set-

tings are on the following pages.

SEL

BACK

Freq.

Select option with arrow buttons

Use arrow buttons

to select value

Gain SEL

BACK

Gain

Level meter at bottom of screen

Freq.

470.675

Press MENU/SEL to highlight MHz or kHz

SEL

BACK

ProgSw

Power

Cough

Mute

(none)

SEL

BACK

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

SEL

BACK

BatTime

Bat 5:41

Reset?

Yes

Select option with arrow buttons

SEL

BACK

Default

Settings

Yes

Select option with arrow buttons

SEL

BACK

WipeKey

Yes

WipeKey?

Select option with arrow buttons

SEL

BACK

TxPower

25 mW

50 mW

Select option with arrow buttons

TxPower

Battery Condition

An icon on the Main Window indicates the remaining

power of the transmitter batteries. This battery gauge

is most accurate with the typical voltage drop across

the life of alkaline batteries.

Battery Gauge

DHu

545.400

-40 -20 0

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

3) Press the MENU/SEL button to save this setting

and return to the previous screen.

4) Press the BACK button to return to the Main

Window.

DHu

LECTROSONICS, INC.

Gain

This setting is very important since it will affect the dy-

namic range that the wireless system will deliver. Gain

must be set according to the individual voice, the mic

capsule in use and the handling technique of the user.

LEDs and a bar type indicator in the LCD facilitate ac-

curate gain adjustment.

IMPORTANT: See Input Gain Adjustment on the

next page for details.

Freq.

The operating frequency is normally determined using

the scanning function in the receiver or with coordina-

tion software. The frequency is shown on the trans-

mitter LCD display in MHz, and is set to match the

receiver. Press the MENU/SEL button repeatedly to

toggle back and forth between MHz and kHz. Adjust-

ment is made in 25 kHz increments.

ProgSw

The Programmable Switch on the side of the housing

can be set to provide several functions, or it can be

bypassed.

• Power: Turns the unit on and off. Press and hold

until the countdown is completed to turn the unit

off. A brief press will turn the unit on with the RF

output turned on.

• Cough: Enables a brief muting of the audio while

the button is held in. Audio is turned back on as

soon as the button is released.

• Mute: Turns the audio off and it remains muted

until the button is pressed again.

• (none): Disables the button functions

DHu

545.400

-40 -20 0

MUTE

MUTE will be displayed in the

Main Window when Cough

or Mute is enabled on the

programmable switch

Rolloff

A low frequency roll-off ﬁlter can be set for a -3dB point

at 35, 50, 70, 100, 120 or 150 Hz.

Gain

Freq.

ProgSw

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. This is

normally used when “comb ﬁltering” is heard. Comb ﬁl-

tering is an odd sounding distortion heard when two or

more microphones are mixed with different polarities.

Switch the transmitter setting back and forth between

Normal and Invert and listen to the audio to determine

which one is the better setting.

BatType

This sets the battery monitoring for Alkaline or Lithium

batteries.

BatTime

Accumulated operating time (runtime) can be tracked

in the transmitter. The total runtime appears on the

BatTime setup screen, displayed in (hrs):(min). The

runtime is kept during battery changes, and must be

reset manually in the BatTime setup screen.

TxPower

Output power can be set to 25mW or 50mW as

needed for the application.

Default

The default setting simply returns the transmitter back

to the factory settings.

WipeKey

Selecting Yes on this setup screen erases the stored

encryption key in the transmitter.

Digital Hand Held Transmitter

Rio Rancho, NM 9

Input Gain Adjustment

The two bicolor Modulation LEDs (located at the bot-

tom of the control panel) provide a visual indication of

the audio signal level entering the transmitter.

DHu

545.400

-40 -20 0

The audio level is shown by LEDs

and a bar type indicator on the LCD.

The gain should be set so that

the -20 LED just turns red on the

loudest peak (the onset of limiting).

The LEDs are marked for viewing when the mic cap-

sule is held up to your mouth. They 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 Off Off

-20 dB to -10 dB Green Off

-10 dB to +0 dB Green Green

+0 dB to +10 dB Red Green

Greater than +10 dB Red Red

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, which could cause feedback.

1) With fresh batteries in the transmitter, power the

unit on into “standby” (no transmission) mode.

2) Press the MENU/SEL button once to enter the

setup menu. Use the UP/DOWN buttons to select

Gain. Press the MENU/SEL button again to enter

the setup screen.

3) Hold the microphone the way it will be used in

actual operation.

4) Speak or sing at the same voice level that will

actually be used during the program, while ob-

serving the modulation LEDs. Use the UP/DOWN

buttons to adjust the gain until the –20 dB LED

starts to ﬂicker red and the –10 dB glows green.

5) Once the audio gain has been set, the RF output

can be turned on and the audio sent through the

sound system for overall level adjustments, moni-

tor settings, etc.

NOTE: Full modulation is achieved when the

-20 LED ﬁrst turns red. 30 dB of clean limiting is

available above this point.

DHu

LECTROSONICS, INC.

Firmware Update

Updating the ﬁrmware is a simple matter of download-

ing a utility program and ﬁle from the website and run-

ning the program on a Windows operating system

with the transmitter connected to a computer via the

USB port.

Go to www.lectrosonics.com/US. In the top menu,

hover the mouse over Support, and click on Wireless

Support. On the right-hand-side Wireless Support

Menu, choose Wireless Downloads. Choose your prod-

uct (DHu), then choose Firmware.

Step 1:

Begin by downloading the USB Firmware Updater

Program.

Step 2:

Next, test the Updater by opening the icon: If the

driver opens automatically, proceed to Step 3.

WARNING: If you receive the following error, the

Updater is not installed on your system. Follow the

TROUBLESHOOTING steps to ﬁx the error.

TROUBLESHOOTING:

If you

receive the

FTDI D2XX

error shown

above,

download

and install

the driver by

clicking on

this link.

Then click here to download.

NOTE: This website, http://www.ftdichip.com/

Drivers/D2XX.htm, is not associated with

Lectrosonics.com. It is a third party site used

only for D2XX drivers currently available for

Lectrosonics’ devices’ upgrades.

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