Lectronics DCHT, DCHT/E01 Instruction Manual

DCHT

Digital Transmitter

DCHT, DCHT/E01

This manual is for all 1.1X versions
of DCHT Firmware.

INSTRUCTION MANUAL

Quick Start Steps

1) Install good batteries and turn power on (see pages
5 and 7).

2) Set compatibility mode to match the receiver (see
page 11).

3) Connect signal source, select input type and adjust
input gain for optimum modulation level (see page

10).

4) Set or sync frequency to match receiver (see page
11, 12). Also see receiver manual for scanning pro­cedure.

5) Set encryption key type and sync with receiver (see
page 13).

6) Set programmable switch to desired function (see
page 13).

7) Verify RF and audio signals are present at the
receiver (see receiver manual).

Fill in for your records:

Serial Number:

Purchase Date:

Rio Rancho, NM, USA
www.lectrosonics.com

DCHT, DCHT/E01

Table of Contents

Quick Start Steps ................................................................ 1

Introduction ........................................................................... 3

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

DSP-controlled Input Limiter ............................................... 3

Encryption ........................................................................... 3

Features and Functions ....................................................... 4

Optional Battery Eliminator ................................................. 4

Whip Antennas .................................................................... 4

Battery Status LED Indicator .............................................. 5

Belt Clips ............................................................................. 5

IR (infrared) Port ................................................................. 5

Status LED .......................................................................... 5

Connecting the Signal Source ............................................ 5

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

DCHT, DCHT/E01 Block Diagram ....................................... 6

Powering On and Off ............................................................ 7

Powering On in Operating Mode ......................................... 7

Powering On in Standby Mode ........................................... 7

Powering Off ....................................................................... 7

Main Menu and Setup Screen Details ................................. 7

Entering the Main Menu ...................................................... 7

Main Window Indicators ..................................................... 7

LCDMenu Map ....................................................................... 8

Input Menu .......................................................................... 10

Adjusting the Input Gain for Analog Inputs ......................... 10

Selecting the Low Frequency Roll-off ................................. 10

Selecting StMode (stereo mode) ........................................ 10

Selecting Input Type ............................................................ 10

Selecting Input Configuration .............................................. 10

Xmit Menu ............................................................................. 11

Selecting Frequency ........................................................... 11

Selecting Transmitter Output Power .................................... 11

Selecting Receiver Compatibility Mode .............................. 11

Turning Rf On/Off ................................................................ 11

Selecting M2R Receiver Functions ..................................... 12

GetFrq ................................................................................. 12

SendFrq .............................................................................. 12

GetAll .................................................................................. 12

SendAll ................................................................................ 12

Name... ................................................................................ 12

Flex ..................................................................................... 12

Key Menu ............................................................................... 13

Encryption Key Management .............................................. 13

KeyType .............................................................................. 13

MakeKey ............................................................................. 13

WipeKey .............................................................................. 13

SendKey .............................................................................. 13

Setup Menu ........................................................................... 13

Selecting AutoOn Feature ................................................... 13

Selecting Programmable Switch Functions......................... 13

Enable/Disable Remote Control Function ........................... 14

Selecting Battery Type ........................................................ 14

Locking/Unlocking Changes to Settings.............................. 14

Selecting Backlit Time ......................................................... 14

Turning LEDs Off/On ........................................................... 14

Restoring Default Settings .................................................. 14

About ..................................................................................... 14

Wireless Designer Software ............................................... 15

Firmware Update Instructions ............................................. 15

Specifications ....................................................................... 15

Input Connections ............................................................... 16

Microphone Cable Termination

for Non-Lectrosonics Microphones ............................. 17

LectroRM ............................................................................... 18

Accessories .......................................................................... 20

Troubleshooting .................................................................... 21

Service and Repair ............................................................... 22

Returning Units for Repair .................................................. 22

2

LECTROSONICS, INC.

Digital Transmitter

Introduction

The DCHT, DCHT/E01 transmitter is designed to work
with a companion receiver (such as the Lectrosonics
M2R, part of the Duet IEM system) as an audio relay
between an audio production bag or cart and a camera
or other audio device. The 6-pin input jack accepts two
mic or line level analog signals or AES digital signals
from external sources with a variety of adapter cables.
Analog inputs can be linked for the same gain when
used with a stereo source, or operate independently
with individual settings.

This third generation digital design features specially
developed, high efficiency digital circuitry for extended
operating time on two AA batteries. The transmitter can
tune in coarse or fine steps across the UHF television
band from 470.100 to 607.950 MHz (E01 frequency
range is 470.100 to 614.375 MHz), with a selectable
output power of 10, 25 or 50 mW.

Studio quality audio performance is assured by high
quality components in the preamp, wide range input
gain adjustment and DSP-controlled limiting. and
settings are included for any lavaliere microphone,
dynamic microphones and line level inputs. Input gain
is adjustable over a 51 dB range in 1 dB steps to allow
a precise match to the input signal level, to maximize
dynamic range and signal to noise ratio.

A separate switch is provided on the top panel that can
be configured as mute, power or bypass.

The housing is constructed of solid machined aluminum
for lasting ruggedness. The exterior is finished with an
ultra hard, dark electroless nickel finish called ebENi.

Firmware updates are made through a side panel micro
USB port.

General Technical
Description

DSP-controlled Input Limiter

The transmitter employs a DSP-controlled analog audio

limiter prior to the analog-to-digital converter. The limiter

has a range greater than 30 dB for excellent overload

protection. A dual release envelope makes the limiter

acoustically transparent while maintaining low distor-

tion. It can be thought of as two limiters in series, con-

nected as a fast attack and release limiter followed by

a slow attack and release limiter. The limiter recovers

quickly from brief transients, so that its action is hidden

from the listener, but recovers slowly from sustained

high levels to keep audio distortion low and preserve

short term dynamic changes in the audio level.

Encryption

When transmitting audio, there are situations where pri-

vacy is essential, such as during professional sporting

events, in court rooms or private meetings. For instanc-

es where your audio transmission needs to be kept

secure, without sacrificing audio quality, Lectrosonics

implements AES256 encryption in our digital wireless

microphone systems. High entropy encryption keys are

first created by the DCHT Transmitter. The key is then

synced with an encryption-capable digital receiver, via

the IR port. The audio will be encrypted and can only

be decoded if both DCHT and receiver have the match-

ing encryption key. If you are trying to transmit an audio

signal and keys do not match, all that will be heard is

silence.

Canada ISED Notice

This device operates on a no-protection, no-interference basis. Should the user seek to obtain
protection from other radio services operating in the same TV bands, a radio licence is required.
For further details, consult Innovation, Science and Economic Development Canada’s document
Client Procedures Circular CPC-2-1-28, Voluntary Licensing of Licence-Exempt_Low-Power

Radio Apparatus in the TV bands.

Rio Rancho, NM

3

DCHT, DCHT/E01

Features and Functions

Battery

status LED

Enter menu/Select item

Return to

previous screen

Status Ready LED

Menu navigation

USB Port

Power

Programmable

function switch

Audio

input

jack

Bi-directional IR port

Modulation

indicators*

Antenna

port

Optional Battery Eliminator

The transmitter can be powered by external DC using
the optional LTBATELIM power supply adapter. The
battery door is replaced by the adapter with a simple
procedure. The adapter provides a locking coaxial con­nector and a variety of power cords and connectors are
available.

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.
Refer to the chart below to determine which an­tenna matches the operating frequency you will
be using.

Frequency Cap
Block Range MHz Color Antenna

470 470.100 - 495.600 Black AMM19

19 486.400 - 511.900 Black AMM19

20 512.000 - 537.500 Black AMM19

21 537.600 - 563.100 Red AMM22

22 563.200 - 588.700 Red AMM22

23 588.800 - 607.950 Red AMM22

4

LECTROSONICS, INC.

Digital Transmitter

Battery Status LED Indicator

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.

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 at a mid­point of the runtime. When the LED begins to blink red,
there will be only a few minutes of operation remaining.

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 immediately after the transmitter is turned
on, but it will soon discharge to the point where it will
turn red or the unit will turn off 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
for BatTime details.

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 firm 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.

Status LED

Blue LED indicates ready status.

Connecting the Signal Source

Microphones, line level audio sources and instruments
can be used with the transmitter. Refer to the section
entitled Input Connections for details on the correct
wiring for line level sources and microphones to take full
advantage of the Servo Bias circuitry.

Battery Installation

The transmitter is powered by two AA batteries. Lithium

batteries are recommended for longest life.

The battery status circuitry compensates for the differ-

ence in voltage drop between alkaline and lithium bat-

teries across their usable life, so it’s important to select

the correct battery type in the menu.

Because rechargeable batteries run down quite abrupt-

ly, 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 available in the receiver.

Push outward on the battery compartment door and lift

it to open.

Slide door outward,

then lift up to open

Insert the batteries according to the markings on the

back of the housing.

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 cotton swab or eraser

crumbs inside the compartment.

Spring contacts

Rio Rancho, NM

5

DCHT, DCHT/E01

Input

DCHT, DCHT/E01 Block Diagram

CHANNEL 1

Input

Preamp

Shunt

Limiter

Servo Bias

Supply

Gain

Adj

Bias Voltage

0, 2 or 3.6V

HI/Lo

Pass

Filter

Limiter Control

Converter

Audio

I2S

A-D

Jack

123456

Rate

Converter

CHANNEL 2 (analog/digital selectable)

Shunt

Limiter

Input

Preamp

Servo Bias

Supply

Gain

Adj

Limiter Control

Bias Voltage

0, 2 or 3.6V

HI/Lo

Pass

Filter

Audio

A-D

Converter

I2S

DSP Clock

Oscillator

VCTCXO

36.864 MHz

Status Ready

PLL Ref

Phase Locked Loop

Microprocessor

Keypad

D-A Converter

I2S

Control

Baseband

Firmware

Update

Voltage Controlled

Oscillator

I + Q

Signals

(2) AA

Batteries

UART

Switching

Power

LED

Tricolor

IR Port

Power

Supply

Low
Pass
Filter

Low
pass

lters

USB

Jack

IQ Modulator

Buer

Final

Amplier

Filters

6

LECTROSONICS, INC.

Digital Transmitter

Powering On and Off

Powering On in Operating Mode

Press and hold the Power Button briefly until the
progress bar on the LCD finishes.

When you release the button, the unit will be operation­al with the RF output turned on and the Main Window
displayed.

Hold
for
Rf On

Powering On in Standby Mode

A brief press of the power button , and releasing it
before the progress bar finishes, will turn the unit on
with the RF output turned off. 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

NOTE: After settings and adjustments are made,
press the power button again to turn the unit off or
navigate to menu item Xmit, RFOn? to choose to
begin transmitting.

Powering Off

Powering

O...

on again before the progress bar finishes, 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.

DCHT

MUTE

470.100

-40

-20

+0

RF indicator blinks

Release

Power Button
before the bar
progresses to
enter Standby

Mode

To turn the unit off, hold the Power

Button in briefly and wait for the
progress bar to finish, or use the
programmable switch (if it is
configured for this function).

If the power button is released, or
the top panel switch is turned back

DCHT

470.100

-40

-20

+0

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 arrow buttons to select the menu item. Then

press the MENU/SEL button to enter the setup screen.

Input...

Gain

Rolloff
StMode

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 the current settings, status,
audio level and battery status.

Programmable

Switch Function

Frequency (MHz)

If the programmable switch function is set for MUTE,
the Main Window will indicate that the function is en­abled.

Mute function

enabled but

not active

When the switch is turned on, the mute icon appear­ance will change and the word MUTE will blink at the
bottom of the display. The -10 LED on the top panel will
also glow solid red.

Mute function

enabled and active

DCHT

MUTE

470.100

-40

Audio level

DCHT

MUTE

470.100

-40

DCHT

MUTE

470.100

-20

-20

Gain

-40

Operating

Battery status

+0

+0

25

-20

0

mode

Main Window will

blink the word

MUTE when the

audio is muted

Rio Rancho, NM

<–MUTE–>

7

DCHT, DCHT/E01

Use arrow buttons

SEL button to

LCD
Menu Map

Settings will be stored
when the BACK button

is pressed.

Input...

Xmit...

SEL

SEL

Gain

1

20

BACK

Rolloff

StMode

InType

InpCfg1

InpCfg2

Freq.

BACK

470.675

Gain

1

22 20

22

2

select channel
(gain value
highlighted)

BACK

BACK

BACK

BACK

BACK

Rolloff

1

Hz Hz

StMode

Indep.
Linked

InType

Analog
AES

InpCfg1

Line In

InpCfg2

Oth Lav

2

Select value with arrow buttons

70 70

Select option with arrow buttons

Select option with arrow buttons

Select setting with arrow
buttons: PSA, DPA, B6,
COS-11, MKE 2, M152, Oth
Lav, Custom, Line In, Dynamic

Select setting with arrow
buttons: PSA, DPA, B6,
COS-11, MKE 2, M152, Oth
Lav, Custom, Line In, Dynamic

SEL

SEL

SEL

SEL

SEL

Press MENU/SEL to highlight MHz or kHz

Select value with arrow buttons

2

to select value

Level meter at bottom of screen

NOTE: When StMode is set
to Linked, a single gain value
field will be shown

M2R...

SEL

BACK

Txpower

Compat

Rf On?

GetFrq

SendFrq

GetAll

SendAll

SEL

SEL

SEL

SEL

SEL

SEL

SEL

BACK

BACK

BACK

BACK

BACK

BACK

BACK

TxPower

10 mW
25 mW
50 mW

Compat

Duet
DCH(X)

Rf On?

Yes
No

GetFreq.

Sync

SendFreq

Sync

GetAll

Sync

SendAll

Sync

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Press UP arrow button to begin sync

Press UP arrow button to begin sync

Press UP arrow button to begin sync

Press UP arrow button to begin sync

Name...

Flex...

SEL

SEL

BACK

BACK

Name...
NameTx
NameCh1
NameCh2

Flex...
SendTx

SendCh1
SendCh2

SEL

BACK

Select option with arrow buttons:
SendTx, SendCh1, SendCh2,
SendM12

8

Select character with arrow buttons

NameTx

Press MENU/SEL to confirm and move cursor to next
position; 8 characters available

SEL

BACK

LECTROSONICS, INC.

SendTx

Sync

Digital Transmitter

SEL

Key...

BACK

NOTE: The key menu
selections only show when
DCH(X) compatibility mode
(encryption) is selected.

Setup...

SEL

BACK

KeyType

MakeKey

WipeKey

SendKey

AutoOn?

ProgSw

SEL

SEL

SEL

SEL

SEL

SEL

BACK

BACK

BACK

BACK

BACK

BACK

KeyType

Shared

MakeKey

No
Yes

WipeKey?

No
Yes

SendKey

Sync

AutoOn?

No
Yes

ProgSw

Mute

Select option with arrow buttons:
Shared, Standard, Volatile,
Universal

Select option with arrow buttons

Select option with arrow buttons

Press UP arrow button to begin sync

Select option with arrow buttons

Select option with arrow buttons:
(none), TalkBk, Power, Mute

NOTE: Make, Wipe
and Send Key
Menu options are
only available in
Shared, Standard
and Volatile Key
Types. They will not
be displayed in the
menu if Universal
Key Type is chosen.

Remote

BatType

Locked?

Backlit

LED Off

Default

SEL

SEL

SEL

SEL

SEL

SEL

BACK

BACK

BACK

BACK

BACK

BACK

Remote

Enable
Ignore

BatType

Alk.
Lith.

Locked?

Yes
No

Backlit

On
30 sec
5 sec

LEDs

On
Off

Default
Settings

No
Yes

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Select option with arrow buttons

Rio Rancho, NM

About

SEL

BACK

About

SEL

BACK

About
DCHT
v1.10
/1.10

9

DCHT, DCHT/E01

Input Menu

Adjusting the Input Gain for Analog Inputs

For analog gain adjustment, two multi-color LEDs on
the top panel, one for each channel, provide a visual
indication 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 CH1 CH2

Less than -20 dB

-20 dB to +0 dB Green Green

+0 dB and greater Red Green

NOTE: This procedure is used for analog inputs
only. AES digital input is factory set at the industry
standard level. The LEDs on the top panel will glow
blue when the audio level reaches about -40 FS.

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.

Input...

Gain

Rolloff
StMode

3) 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 audio device to the maximum
level that will be used.

4) Use the and arrow buttons to adjust the gain
until the LED glows green most or all of the time,
and flicker red during the loudest peaks.

5) Turn the recorder or sound system gain down be­fore setting the transmitter to the normal operating
mode and enabling the audio output.

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.

-40

Setup screen in

Off Off

Gain

25

-20

Linked mode

Gain

20

0

-40

Setup screen in

Independent mode

25

-20

Selecting the Low Frequency Roll-off

The low frequency audio roll-off 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-off takes place
can be set at 20, 35, 50, 70, 100, 120 and 150 Hz.

Input...

Gain

Rolloff
StMode

Rolloff

70 Hz

Setup screen in

Linked mode

Rolloff

21
70

70

Hz

Hz

Setup screen in

Independent mode

Selecting StMode (stereo mode)

The two channels can be set to Indep (independent) or
Linked. Indep allows the gain to be adjusted separately

on each channel. Linked employs the gain adjustment
to both channels.

Input...

StMode

Gain

21

Rolloff
StMode

0

Selecting Input Type

AES digital or analog audio input is selected with the
InType menu item. With the AES selected, there are no
additional settings needed for the input. Analog input
configuration is set with the InpCfg1 and InpCfg2
menu items.

Input...

Indep
Linked

InType

InType

InpCfg1
InpCfg2

Analog
AES

Selecting Input Configuration

When the input type is set to Analog, InpCfg1 and
InpCfg2 menus are used to configure the audio input

for the respective channels. Use the and arrow
buttons to select the input type.

Input...

InType

InpCfg1
InpCfg2

InpCfg1

Line In

InpCfg2

Oth Lav

10

LECTROSONICS, INC.

Digital Transmitter

Xmit...

Freq

TxPower
Compat

TYPE DESC, BIAS, IMPEDANCE, POLARITY

Line In

Dynamic

PSA

DPA

B6

COS-11

MKE 2*

M152*

Oth Lav*

Custom

* Separate listings for these microphones are included
for convenience, however, they are all the same con­figuration.

The Custom option opens a setup screen that provides
a variety of settings. Press SEL to select the custom
setup item, then press the
adjust the setting.

InpCfg2

Custom

MicLoZ

0V Neg

Available settings:

• Input impedance (Z): LOW, MID, HIGH

• Bias voltage: 0V, 2V, 4V

• Audio polarity: + (pos.), – (neg.)

Line level signals up to +24 dBu

Low-Z dynamic microphones

Point Source Audio lav microphones

DPA lavaliere; 4V, Mid-Z, (+)

Countryman B6; 2V, Low-Z, (+)

Sanken COS-11; 4V, Low-Z, (–)

Sennheiser MKE 2; 4V, Low-Z, (+)

Lectrosonics M152; 4V, Low-Z, (+)

Other lavaliere; 4V, Low-Z, (+)

Manually configurable microphone level

and arrow buttons to

Channel select

Input impedance

Bias voltage

Audio polarity

Xmit Menu

Selecting Frequency

The setup screen for frequency selection offers multiple
ways to browse the available frequencies.

Selecting Transmitter Output Power

The output power can be set to 10 mW, 25 mW
or 50 mW.

TxPower

10 mW
25 mW
50 mW

Selecting Receiver Compatibility Mode

The transmitter can be set to operate with different
receivers:

Duet: M2R digital IEM/IFB receiver

DCH(X): M2R-X encrypted (FW v3.x)

Xmit...

Compat

Freq

TxPower
Compat

Duet
DCH(X)

Turning Rf On/Off

Turn Rf off to preserve battery power while setting other
transmitter functions. Turn it back on to begin transmit­ting.

Xmit...

TxPower

Compat
Rf On?

NOTE: When transmitter is off, a brief press of the
Power Button will turn the transmitter on with Rf
off. Use this function to turn Rf on when ready to
transmit.

Rf On?

Ye s
No

Xmit...

Freq

TxPower
Compat

Press the MENU/SEL button to select each field. Use
the and arrow buttons to adjust the frequency.
Each field will step through the available frequencies in
a different increment.

Rio Rancho, NM

Freq.

494.500

NOTE: When the frequency is highlighted, hold
down the MENU/SEL button to increase or
decrease frequency in higher increments.

Freq.

494.500

11

DCHT, DCHT/E01

Selecting M2R Receiver
Functions

The M2R Receiver includes a FlexList™ mode where
up to 16 mixes can be accessed by name. This feature
enables a user to quickly find and listen to any of the
performer’s mixes on the stage. The mix includes the
name, frequency, mixer settings and limiter settings.
The mix is easily shared via the M2R IR port, added to
the list of 16 mixes and stored until cleared by the user.
The M2R allows the user to toggle between the mixes,
making troubleshooting issues easy and efficient.

The DCHT, DCHT/E01’s M2R functions create an easy
interface with the FlexList feature. The following options
are available:

M2R...

GetFrq

SendFrq
GetAll

GetFrq

Sync to receive (get) frequency from the M2R transmit­ter via the IR port

SendFrq

Sync to send frequency to the M2R transmitter via the
IR port

GetFrq

Sync

M2R...

SendAll
Name

Flex

SendFrq

Sync

Press the arrow

button to begin sync

SendAll

Sync to send all available settings to the M2R transmit­ter via the IR port, including the performer’s name, (or
whatever name the user chooses for the DCHT, DCHT/
E01), frequency, mixer settings and limiter settings.

NOTE: The SendAll function is designed for trouble
shooting and allows for settings to be cloned to transfer
to another receiver if there is a problem to be identified.
Not all settings are available on the DCHT, DCHT/E01.

GetAll

Sync

SendAll

Sync

Press the arrow

button to begin sync

Name...

Name the DCHT, DCHT/E01 to allow easy identifica­tion on the M2R FlexList. The following are available for
custom names:

- NameTx: Name the DCHT, DCHT/E01

- NameCh1: Name Channel 1

- NameCh2: Name Channel 2

Use the UP and DOWN arrows to choose which
character you want and then MENU/SEL to move
to next space (there are 8 spaces available for each
name). Press BACK to save.

NOTE: Duplicate names are not allowed in a FlexList.
Be sure to choose unique names for Tx, Ch1 and Ch2.

NameTx

Cursor

DCHT

Press the and

arrow buttons to select

the desired character,

press MENU/SELECT

to move to next space;

there are 8 spaces

available.

GetAll

Sync to receive (get) all available settings from the M2R
transmitter via the IR port, including the performer’s
name, (or whatever name the user chooses for the
DCHT, DCHT/E01), frequency, mixer settings and lim­iter settings.

NOTE: The GetAll function is designed for trouble
shooting and allows for settings to be cloned to transfer
to another receiver if there is a problem to be identi­fied. Not all copied settings are available on the DCHT,
DCHT/E01.

12

Flex

Sync DCHT, DCHT/E01 information to the M2R FlexList
either as one stereo Channel or individual channels:

- SendTx: Send (sync) all receiver information to
the M2R FlexList as one stereo channel

- SendCh1: Send (sync) Channel 1 unique infor-
mation to the M2R FlexList

- SendCh2: Send (sync) Channel 2 unique infor-
mation to the M2R FlexList

- SendM12: Send (sync) a mono mix of both
channels to the M2R FlexList

SendTx

Sync

SendCh1

Sync

Use the arrow

button to begin sync

LECTROSONICS, INC.

Digital Transmitter

Key Menu

Encryption Key Management

KeyType

The DCHT has four options for encryption keys:

• Universal: This is the most convenient encryption
option available. All encryption-capable Lectroson­ics transmitters and receivers contain the Universal
Key. The key does not have to be generated by
the DCHT. Simply set a Lectrosonics encryption­capable receiver and the DCHT to Universal, and
the encryption is in place. This allows for convenient
encryption amongst multiple transmitters and re­ceivers, but not as secure as creating a unique key.

NOTE: When the DCHT is set to Universal
Encryption Key, Make Key, Wipe Key and Share
Key will not appear in the menu.

• Shared: There are an unlimited number of shared
keys available. Once generated by the DCHT and
transferred to an encryption capable receiver, the
encryption key is available to be shared (synced) by
the receiver with other encryption capable transmit­ters/receivers via the IR port.

• Standard: Standard Keys are unique to the DCHT.
The transmitter generates the Standard Key. The
DCHT is the sole source of the Standard Key, and
because of this, the DCHT may not receive (get)
any Standard Keys.

• Volatile: This one-time only key is the highest level
of encryption security. The Volatile Key exists only
as long as the power in both the DCHT Transmitter
and an encryption capable receiver remains on dur­ing a single session. If the receiver is powered off,
but the DCHT has remained turned on, the Volatile
Key must be sent to the receiver again. If the power
is turned off on the DCHT, the entire session con­cludes and a new Volatile Key must be generated
by the transmitter and sent to the receiver via the IR
port.

MakeKey

When the transmitter key type is set to Volatile, Stan­dard or Shared, use this menu item to create a key that
can be synced with an encryption capable receiver.

WipeKey

This menu item is only available if there is a Key Type
currently on the DCHT that can be deleted. Select Yes
to wipe the current key and enable the DCHT to create
a new key.

Key...

KeyType
MakeKey

WipeKey

WipeKey?

No
Ye s

SendKey

This menu item is only available if Key Type is set to
Volatile, Standard or Shared, and a new key has been
created. Press Menu/Sel to sync the Encryption key to
another transmitter or receiver via the IR port.

Key...

SendKey

MakeKey
WipeKey

SendKey

Send

Setup Menu

Selecting AutoOn Feature

If external power or batteries fail while the unit is
transmitting, the unit will automatically turn back on
after power is restored or fresh batteries are installed.
This function is enabled by selecting Yes in the menu
options.

Setup...

AutoOn?
ProgSw

Remote

NOTE: AutoOn does not work when the transmitter
is in the Standby mode.

Selecting Programmable Switch Functions

The programmable switch on the top panel can be con­figured using the menu to provide several functions:

• (none) - disables the switch

• Mute - mutes the audio when switched on; LCD will
blink a message and -10 LED will glow solid red

• Power - turns the power on and off

• TalkBk - redirects the audio to a different output
channel on the receiver (only available in DCH(X)
compatibility mode)

Setup...

AutoOn?
ProgSw

Remote

NOTE: The programmable switch will continue
to operate whether or not keypad changes are
locked.

AutoOn?

No
Ye s

ProgSw

Mute

Press the and
arrow buttons to select
the desired function or

disable the switch

Rio Rancho, NM

13

DCHT, DCHT/E01

Enable/Disable Remote Control Function

The “dweedle tone” remote control is turned on or off
with the Remote menu, setting the transmitter to react
to tones received (Enable) or to Ignore the tones.

Setup...

Remote

AutoOn?
ProgSw

Remote

NOTE: Remote control of settings is enabled
using a third party smart phone app named
DCHTRemote, published by New Endian, LLC.

Enable
Ignore

Selecting Battery Type

The voltage drop over the life of different batteries var­ies by type and brand. Be sure to set the correct battery
type for accurate indications and warnings. The menu
offers alkaline or lithium types.

Setup...

BatType
Locked?

Backlit

BatType

Alk.
Lith.

Selecting Backlit Time

Adjusts the duration of the LCD back light to 30 sec­onds, 5 minutes, or to remain on.

Setup...

BatType
Locked?

Backlit

Backlit

On
30 sec
5 sec

Turning LEDs Off/On

Options to turn the control panel LEDs on or off.

Setup...

LEDs

Backlit
LED Off

Default

On
Off

Restoring Default Settings

This is used to restore the factory settings.

If you are using rechargeable batteries, it is better to
use the timer function 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.

Locking/Unlocking Changes to Settings

Changes to the settings can be locked to prevent inad­vertent changes being made.

Setup...

Locked?

BatType
Locked?

Backlit

A small padlock symbol will appear on adjustment

screens when changes have been locked.

When changes 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 and On/Off).

• Sync functions are still available.

Ye s
No

Gain

-40

25

-20

Setup...

Backlit
LED Off

Default

Default
settings

No
Ye s

About

Displays model number and firmware
version.

TopMenu...

Key...
Setup...

0

About

About
DCHT

V1.10

/1.10

14

LECTROSONICS, INC.

Digital Transmitter

Firmware Update
Instructions

Firmware updates are made with a file downloaded
from the web site and the DCHT, DCHT/E01 connected
via USB.

The USB port on the transmitter requires a micro-B
male plug on the connecting cable. The other end of the
cable would normally be a USB A-Type male connec­tor to fit the most common type of USB jack used on
computers.

Put the transmitter in UPDATE mode

by simultaneously holding down

UPDATE

DCHT

V1.10

/1.10

the UP and DOWN arrow buttons
on the transmitter control panel
while powering it up.

Refer to Help in Wireless Designer

software for instructions.

Once the Update has completed,

turn off the transmitter, then turn it
back on to verify that the firmware
version on the transmitter LCD
matches the firmware version
shown on the web site. The firm­ware is the second LCD display
during boot up sequence.

Specifications

Operating Frequencies:
DCHT 470.100 - 607.950 MHz
DCHT/E01 470.100 - 614.375 MHz

NOTE: It’s the user’s responsibility to select the approved
frequencies for the region where the transmitter is
operating

Frequency Selection Steps: 25 kHz or 100 kHz
RF Power Output:
Frequency Stability: ± 0.002%
Spurious Radiation:
DCHT Compliant ETSI EN 300 422-1 v1.4.2
DCHT/E01 Compliant ETSI EN 300 422-1 v2.1.2
Digital Modulation: 8PSK
Encryption: AES 256-CTR (per FIPS 197 and FIPS 140-2)
Equivalent Input Noise: –128 dBV
Input Types: • Analog; mic and line level

• AES digital
Input Level (analog) • Mic: Nominal 2 mV to 300 mV, before limiting

Greater than 1V maximum, with limiting

• Line: +24 dBu before limiting
Input Impedance: • Mic: 300 or 4.5 k ohm; selectable

• Line: greater than 100 k ohm
Input Limiter: Dual envelope type; 30 dB range
Gain Control Range: 51 dB in 1 dB steps; digital control
Modulation Indicators: • Bicolor LED indicates modulation of

-20 and 0 dB referenced to full modulation

• LCD bar graph
Frequency Response: 15 Hz – 11.3 kHz, +0, -3 dB
Controls: • Top panel toggle switch; programmable as

power, mute or none (off) function

• Side panel membrane switches with LCD
interface for power on/off and all setup and
configuration controls

Audio Input Jack: Switchcraft 6-pin locking (TA6F)
Antenna: Galvanized steel, flexible wire, SMA connector
Battery: Two AA Duracell Quantum recommended
Battery Life: 5 hours; Duracell Quantum alkaline
Weight: • 5.75 ozs. (163 grams); w/ belt clip and lithium

AA batteries

• 6.40 ozs. (181 grams); w/ belt clip and Duracell
Quantum AA batteries

Overall dimensions: 3.45 x 2.44 x .742 in. (88 x 62 x 19 mm)
Emission Designator: 200KG7E

Selectable; 10, 25 or 50 mW

Rio Rancho, NM

Specifications subject to change without notice

15

DCHT, DCHT/E01

Input Connections

The 6-pin input jack accommodates two discrete chan­nels at microphone or line levels. The input connections
are configured as follows:

ANALOG DIGITAL

Pin 1 CH 1 Shield/Gnd AES GND

Pin 2 CH 1 Mic level

Pin 3 CH 1 Line level

Pin 4 CH 2 Mic level AES CH 1

Pin 5 CH 2 Shield/Gnd AES CH 2

Pin 6 CH 2 Line level

6

1

2

TA6FLX connector

viewed from outside

5

4

NOTICE: Any microphone wired using pin 2 for elec-

tret bias will NOT work with the DCHT, DCHT/E01 and
MCTA6TA5M2 adapter. For example, see figures 1
and 2 (below) for servobias inputs that will not operate
properly.

Fig. 1

2 VOLT POSITIVE BIAS 2-WIRE ELECTRET

SHIELD

A UDI O

Compatible wiring for microphones such as
Countryman E6 headworn and B6 lavaliere.

3.3 k

Also see Fig. 9

1.5 k

PIN

1

2

3

4

5

4

3

T A5 F
PLUG

1

5

2

Fig. 2

2 VOLT NEGATIVE BIAS 2-WIRE ELECTRET

SHIELD

AUDIO

Compatible wiring for microphones
such as negative bias TRAM models.

NOTE: The resistor value can range from 2k to 4k ohms.

2.7 k

PIN

1

2

1

4

3

5

3

TA5F

PLUG

2

4

5

3

Refer to the Accessories section of this manual for
details on the available adapter cables.

The mating connector for the DCHT, DCHT/E01 in­put jack is a Switchcraft TA6FLX 6-pin female (nickel
plated).

Lectrosonics P/N 21932.

NOTE: The Sanken CUB-01 is wired using pin
2 for the bias and will not work with the DCHT,
DCHT/E01 and MCTA6TA5M2 adapter.

16

LECTROSONICS, INC.

Microphone Cable Termination

0.3"

for Non-Lectrosonics Microphones

TA6F Connector Assembly

Mic Cable Stripping Instructions

1

5

6

4

2

Digital Transmitter

3

VIEWED FROM

0.15"

OUTSIDE

Crimping to Shield and Insulation

Strip and position the cable so that the clamp
can be crimped to contact both the mic cable
shield and the insulation. The shield contact
reduces noise with some microphones and the
insulation clamp increases ruggedness.

Rio Rancho, NM

Shield

Crimp these

fingers to

contact the

shield

Insulation

Crimp these

fingers to
clamp the
insulation

17

DCHT, DCHT/E01

DCHTRemote

By New Endian LLC

DCHTRemote is a mobile application for iOS operat­ing systems to remotely control the Lectrosonics DCHT
Transmitter.

The app remotely changes settings on the transmitter
through the use of encoded audio tones, which when
received by the attached microphone, will alter the con­figured setting. The app is available for download and
sells for about $25 on the Apple App Store.

DCHTRemote’s remote control mechanism is the use of
an audio sequence of tones (dweedles) that are inter­preted by the transmitter as a configuration change. The
settings available in DCHTRemote are:

• Audio Level (Gain)

• Frequency

• Sleep Mode

• Lock Mode

• Output Power

• Low Frequency Roll-off

• LED on/off

Activation

For the DCHT to respond to remote control audio tones,
the transmitter must:

• The transmitter must not be turned off; it can how­ever be in sleep mode.

• Remote control must be enabled.

Please be aware this app is not a Lectrosonics
product. It is privately owned and supported by
New Endian LLC, www.newendian.com.

18

LECTROSONICS, INC.

Digital Transmitter

For body worn operation, this transmitter model has been tested and meets the FCC RF exposure
guidelines when used with the Lectrosonics accessories supplied or designated for this product. Use of
other accessories may not ensure compliance with FCC RF exposure guidelines. Contact Lectrosonics
if you have any questions or need more information about RF exposure using this product..

This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment.
This device should be installed and operated so that its antenna(s) are not co-located or operating in
conjunction with any other antenna or transmitter.

This device complies with ISED Canada radiation exposure limits as set forth for an uncontrolled
environment.

Cet appareil est conforme avec les normes d’Industrie Canada concernant les limites d’exposition aux
radiations pour un environnement incontrôlé.

This radio transmitter [IC: 8024A-DCHT, DCHT/E01] has been approved by Innovation, Science and
Economic Development Canada to operate with the antenna types listed below, with the maximum
permissible gain indicated. Antenna types not included in this list that have a gain greater than the
maximum gain indicated for any type listed are strictly prohibited for use with this device.

Lectrosonics provides dipole “whip” antennas for use with the DCHT, DCHT/E01 transmitter.
The antennas are cut to the frequency range shown below and include a 50 Ohm SMA con­nector.

Antenna Model Freq Range (MHz) Gain (dBi)

AMM19 470.100 - 537.500 2.15

AMM22 537.500 - 607.950 2.15

Rio Rancho, NM

19

DCHT, DCHT/E01

Accessories

26895: Wire belt clip

BCSLEBN: Spring-loaded belt clip

MCTA6PT: General purpose cable with TA6FLX 6-pin

female on one end and stripped and tinned wires on the
other end with two separate cables. Wired for connec­tion to microphone level signals. 18 inch length.

MCTA6TA3F2: Line level signals from two TA3-M out­puts. 18 inch length.

LTBATELIM: Replaces the batteries for powering the
DCHT, DCHT/E01 from external DC, 5 to 25 volts.

MCTA6AESXLRF: AES3 digital signal from XLR-F
output. 18 inch length.

MCTA6TA5M2: Microphone and line level signals from
microphones and other devices configured with TA5F
connectors for Lectrosonics wireless transmitters.
6 inch length.

MCTA6XLRF2: Line level signals from two XLR-M
outputs. 18 inch length.

20

LECTROSONICS, INC.

Digital Transmitter

Troubleshooting

Symptom: Possible Cause:

Transmitter Battery LED off 1. Batteries are inserted incorrectly.
when Power Switch “ON” 2. Batteries are low or dead.

No Transmitter Modulation LEDs 1. Gain control turned all the way down.
when Signal Should be Present 2. Batteries are inserted incorrectly. Check power LED.

3. Mic capsule is damaged or malfunctioning.

4. Input cable damaged or miswired.

Receiver Indicates RF But No Audio 1. Audio source or cable connected to transmitter is defective. Try
using an alternate source or cable.

2. Ensure musical instrument volume control is not set to minimum.

Receiver RF Indicator Off 1. Ensure that the transmitter and receiver are set to the same
frequency.

2. Transmitter not turned on, or battery is dead.

3. Receiver antenna missing or improperly positioned.

4. Operating distance is too great.

5. Transmitter may be set to the Standby Mode.

No Sound (Or Low Sound Level), Receiver 1. Receiver output level set too low.
Indicates Proper Audio Modulation 2. Receiver output is disconnected; cable is defective or miswired.

3. Camera/Recorder/Mixer input is turned down.

Distorted Sound 1. Transmitter gain (audio level) is too high. Check Modulation
LEDs on transmitter and receiver while distortion is being heard.

2. Receiver output level may be mismatched with the Camera
Recorder/Mixer input. Adjust output level on receiver to the correct
level for the device it is feeding.

3. RF interference. Reset both transmitter and receiver to a clear
channel. Use scanning function on receiver if available.

Wind Noise or Breath “Pops’” 1. Reposition microphone, or use a larger windscreen, or both.

2. Omni-directional mics produce less wind noise and breath pops
than directional types.

Hiss and Noise -- Audible Dropouts 1. Transmitter gain (audio level) far too low.

2. Receiver antenna missing or obstructed.

3. Operating distance too great.

4. RF interference. Reset both transmitter and receiver to a
clear channel. Use scanning function on receiver if available.

Rio Rancho, NM

21

DCHT, DCHT/E01

Service and Repair

If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting
cables and then go through the Troubleshooting section in this manual.

We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop at­tempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection,
send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set at the
factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are
no adjustments inside that will make a malfunctioning unit start working.

LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest
flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does
to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone
for out-of-warranty repairs.

Returning Units for Repair

For timely service, please follow the steps below:

A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need

to know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).

B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed

your repair through our receiving and repair departments. The return authorization number must be clearly shown
on the outside of the shipping container.

C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the

proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for
safe transport.

D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-

age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.

Lectrosonics USA:

Mailing address: Shipping address: Telephone:

Lectrosonics, Inc. Lectrosonics, Inc. [phone]
PO Box 15900 561 Laser Rd. NE, Suite 102 [phone] Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 [phone] Fax
USA USA

Web: E-mail:
www.lectrosonics.com [e-mail]

[e-mail]

Lectrosonics Canada:

Mailing Address: Telephone: E-mail:

720 Spadina Avenue, [phone] Sales: [e-mail]
Suite 600 [phone] Toll-free Service: [e-mail]
Toronto, Ontario M5S 2T9 (877-7LECTRO)
[phone] Fax

22

LECTROSONICS, INC.

Digital Transmitter

Rio Rancho, NM

23

m

LIMITED ONE YEAR WARRANTY

The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.

Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.

This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.

This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.

This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
[phone] • [phone] • fax [phone] • [e-mail]

7 November 2019