Lectronics DCHT User manual

DCHT
Digital Transmitter
DCHT, DCHT/E01
INSTRUCTION MANUAL
Rio Rancho, NM, USA
www.lectrosonics.com
Fill in for your records:
Serial Number:
Purchase Date:
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 pro-
cedure.
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).
This manual is for all 1.1X versions
of DCHT Firmware.

DCHT, DCHT/E01
LECTROSONICS, INC.
2
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

Digital Transmitter
Rio Rancho, NM 3
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.
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.
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.

DCHT, DCHT/E01
LECTROSONICS, INC.
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Features and Functions
Battery
status LED
Status Ready LED
Menu navigation
Power
Return to
previous screen
Enter menu/Select item
Modulation
indicators*
Programmable
function switch
Audio
input
jack
Antenna
port
Bi-directional IR port
Whip Antennas
Because the transmitter tunes across such a
broad frequency range, it is best to use the ap-
propriate 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 an-
tenna 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
USB 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 con-
nector and a variety of power cords and connectors are
available.

Digital Transmitter
Rio Rancho, NM 5
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 mid-
point 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 par-
ticular 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 num-
ber BCSLEBN) is also available. This clip is attached by
removing the plastic hole cap on the back of the hous-
ing 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

DCHT, DCHT/E01
LECTROSONICS, INC.
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DCHT, DCHT/E01 Block Diagram
I2S
A-D
Converter
Shunt
Limiter
Limiter Control
Gain
Adj
HI/Lo
Pass
Filter
Input
Preamp
Bias Voltage
0, 2 or 3.6V
Servo Bias
Supply
Audio
Filters
Keypad
(2) AA
Batteries
Oscillator
VCTCXO
I2S
Voltage Controlled
Oscillator
Final
Amplier
Control
PLL RefPhase Locked Loop
DSP Clock
Switching
Power
Supply
Microprocessor
Power
LED
Tricolor
D-A Converter
I + Q
Baseband
Signals
Low
pass
lters
IQ Modulator
UART USB
Jack
Firmware
Update
Status Ready
Low
Pass
Filter
Buer
36.864 MHz
IR Port
I2S
A-D
Converter
Shunt
Limiter Limiter Control
Gain
Adj
HI/Lo
Pass
Filter
Input
Preamp
Bias Voltage
0, 2 or 3.6V
Servo Bias
Supply
Audio
Input
Jack
123456
CHANNEL 1
CHANNEL 2 (analog/digital selectable)
Rate
Converter

Digital Transmitter
Rio Rancho, NM 7
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 operation-
al with the RF output turned on and the Main Window
displayed.
Hold
for
Rf On 470.100
-40 -20 +0
DCHT
MUTE
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 adjust-
ments without the risk of interfering with other wireless
systems nearby.
Hold
for
Rf On
Release
Power Button
before the bar
progresses to
enter Standby
Mode
RF indicator blinks
470.100
-40 -20 +0
DCHT
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...
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
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.
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 oper-
ating 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.
-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.
Input...
Gain
Rolloff
StMode
Main Window Indicators
The Main Window displays the current settings, status,
audio level and battery status.
470.100
-40 -20 +0
DCHT
MUTE
Frequency (MHz)
Operating
mode
Battery status
Audio level
Programmable
Switch Function
If the programmable switch function is set for MUTE,
the Main Window will indicate that the function is en-
abled.
470.100
-40 -20 +0
DCHT
MUTE
Mute function
enabled but
not active
When the switch is turned on, the mute icon appear-
ance 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.
470.100
DCHT
MUTE
<–MUTE–>
Main Window will
blink the word
MUTE when the
audio is muted
Mute function
enabled and active

DCHT, DCHT/E01
LECTROSONICS, INC.
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LCD
Menu Map
Input... SEL
BACK
SEL
BACK
Freq.
Xmit...
470.675
Press MENU/SEL to highlight MHz or kHz
Select value with arrow buttons
Rolloff
StMode
InType
InpCfg1
InpCfg2
SEL
BACK
Rolloff
Select value with arrow buttons
SEL
BACK Indep.
Linked
StMode
Select option with arrow buttons
SEL
BACK Analog
AES
InType
Select option with arrow buttons
SEL
BACK
InpCfg1
Line In
SEL
BACK
InpCfg2
Oth Lav
Txpower
Compat
Rf On?
SEL
BACK
SEL
BACK
Name...
Flex...
Name...
NameTx
NameCh1
NameCh2
Flex...
SendTx
SendCh1
SendCh2
NameTx
SEL
BACK Press MENU/SEL to confirm and move cursor to next
position; 8 characters available
Select character with arrow buttons
SEL
BACK
SendTx
Sync
Select option with arrow buttons:
SendTx, SendCh1, SendCh2,
SendM12
SEL
BACK
SEL
BACK
GetAll
SendAll
GetAll
Sync Press UP arrow button to begin sync
SendAll
Sync Press UP arrow button to begin sync
GetFrq
SEL
BACK
M2R... SEL
BACK
GetFreq.
Sync Press UP arrow button to begin sync
SEL
BACK
SendFrq SendFreq
Sync Press UP arrow button to begin sync
SEL
BACK
TxPower
Select option with arrow buttons
10 mW
25 mW
50 mW
SEL
BACK
Compat
Duet
DCH(X)
Select option with arrow buttons
SEL
BACK
Rf On?
Yes
No
Select option with arrow buttons
Use arrow buttons
to select value
22
Gain
Level meter at bottom of screen
20
2
1
SEL button to
select channel
(gain value
highlighted)
Gain
2220
2
1
7070
2
1
Hz Hz
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
NOTE: When StMode is set
to Linked, a single gain value
field will be shown
Settings will be stored
when the BACK button
is pressed.

Digital Transmitter
Rio Rancho, NM 9
SEL
BACK
Setup...
SEL
BACK
ProgSw
AutoOn? SEL
BACK
AutoOn?
Select option with arrow buttons
ProgSw
Mute
Select option with arrow buttons:
(none), TalkBk, Power, Mute
Remote SEL
BACK
Remote
Select option with arrow buttons
BatType SEL
BACK
BatType
Alk.
Lith.
Select option with arrow buttons
SEL
BACK
Locked?
Locked?
Select option with arrow buttons
Backlit SEL
BACK Select option with arrow buttons
Backlit
On
30 sec
5 sec
SEL
BACK
LED Off Select option with arrow buttons
SEL
BACK
Default
Default
Settings
No
Yes
Select option with arrow buttons
LEDs
On
Off
SEL
BACK
About About SEL
BACK
About
DCHT
v1.10
/1.10
SEL
BACK
Key... KeyType SEL
BACK
KeyType
Shared
SEL
BACK
MakeKey
WipeKey SEL
BACK
WipeKey?
SEL
BACK
SendKey SendKey
Sync Press UP arrow button to begin sync
No
Yes
MakeKey
No
Yes
Select option with arrow buttons
Select option with arrow buttons
Select option with arrow buttons:
Shared, Standard, Volatile,
Universal
No
Yes
Enable
Ignore
Yes
No
NOTE: The key menu
selections only show when
DCH(X) compatibility mode
(encryption) is selected.
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.

DCHT, DCHT/E01
LECTROSONICS, INC.
10
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 transmit-
ter. 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 Off Off
-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 en-
ter 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 -40 -20 0
Gain
25
-40 -20 0
Gain
25
20
21
Setup screen in
Linked mode
Setup screen in
Independent mode
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 be-
fore 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 ad-
justment set according to these instructions, and do
not change it to adjust the audio output level of the
receiver.
Selecting the Low Frequency Roll-off
The low frequency audio roll-off is adjustable to op-
timize 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.
Rolloff
70 Hz
Input...
Gain
Rolloff
StMode
Rolloff
70
Hz
21
70
Hz
Setup screen in
Linked mode
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.
StMode
Indep
Linked
Input...
Gain
Rolloff
StMode
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...
InType
InpCfg1
InpCfg2
InType
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

Digital Transmitter
Rio Rancho, NM 11
TYPE DESC, BIAS, IMPEDANCE, POLARITY
Line In Line level signals up to +24 dBu
Dynamic Low-Z dynamic microphones
PSA Point Source Audio lav microphones
DPA DPA lavaliere; 4V, Mid-Z, (+)
B6 Countryman B6; 2V, Low-Z, (+)
COS-11 Sanken COS-11; 4V, Low-Z, (–)
MKE 2* Sennheiser MKE 2; 4V, Low-Z, (+)
M152* Lectrosonics M152; 4V, Low-Z, (+)
Oth Lav* Other lavaliere; 4V, Low-Z, (+)
Custom Manually configurable microphone level
* Separate listings for these microphones are included
for convenience, however, they are all the same con-
figuration.
The Custom option opens a setup screen that provides
a variety of settings. Press SEL to select the custom
setup item, then press the and arrow buttons to
adjust the setting.
InpCfg2
Custom
MicLoZ
0V Neg
Channel select
Input impedance
Bias voltage
Audio polarity
Available settings:
• Input impedance (Z): LOW, MID, HIGH
• Bias voltage: 0V, 2V, 4V
• Audio polarity: + (pos.), – (neg.)
Xmit Menu
Selecting Frequency
The setup screen for frequency selection offers multiple
ways to browse the available frequencies.
Xmit...
Freq
TxPower
Compat
Freq.
494.500
Freq.
494.500
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.
NOTE: When the frequency is highlighted, hold
down the MENU/SEL button to increase or
decrease frequency in higher increments.
Selecting Transmitter Output Power
The output power can be set to 10 mW, 25 mW
or 50 mW.
Xmit...
Freq
TxPower
Compat
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...
Freq
TxPower
Compat
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 transmit-
ting.
Xmit...
TxPower
Compat
Rf On?
Rf On?
Ye s
No
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.

DCHT, DCHT/E01
LECTROSONICS, INC.
12
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...
SendAll
Name
Flex
M2R...
GetFrq
SendFrq
GetAll
GetFrq
Sync to receive (get) frequency from the M2R transmit-
ter via the IR port
SendFrq
Sync to send frequency to the M2R transmitter via the
IR port
GetFrq
Sync
SendFrq
Sync Press the arrow
button to begin sync
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 lim-
iter 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 identi-
fied. Not all copied settings are available on the DCHT,
DCHT/E01.
SendAll
Sync to send all available settings to the M2R transmit-
ter 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.
Press the arrow
button to begin sync
GetAll
Sync
SendAll
Sync
Name...
Name the DCHT, DCHT/E01 to allow easy identifica-
tion 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
DCHT
Cursor
Press the and
arrow buttons to select
the desired character,
press MENU/SELECT
to move to next space;
there are 8 spaces
available.
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
Use the arrow
button to begin sync
SendTx
Sync
SendCh1
Sync

Digital Transmitter
Rio Rancho, NM 13
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 Lectroson-
ics transmitters and receivers contain the Universal
Key. The key does not have to be generated by
the DCHT. Simply set a Lectrosonics encryption-
capable receiver and the DCHT to Universal, and
the encryption is in place. This allows for convenient
encryption amongst multiple transmitters and re-
ceivers, 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 transmit-
ters/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 dur-
ing 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 con-
cludes 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, Stan-
dard 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...
MakeKey
WipeKey
SendKey
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
AutoOn?
No
Ye s
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 con-
figured 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)
ProgSw
Mute
Press the and
arrow buttons to select
the desired function or
disable the switch
Setup...
AutoOn?
ProgSw
Remote
NOTE: The programmable switch will continue
to operate whether or not keypad changes are
locked.

DCHT, DCHT/E01
LECTROSONICS, INC.
14
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...
AutoOn?
ProgSw
Remote
Remote
Enable
Ignore
NOTE: Remote control of settings is enabled
using a third party smart phone app named
DCHTRemote, published by New Endian, LLC.
Selecting Battery Type
The voltage drop over the life of different batteries var-
ies 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.
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 volt-
age 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 inad-
vertent changes being made.
Locked?
Ye s
No -40 -20 0
Gain
25
A small padlock symbol will appear on adjustment
screens when changes have been locked.
Setup...
BatType
Locked?
Backlit
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.
Selecting Backlit Time
Adjusts the duration of the LCD back light to 30 sec-
onds, 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...
Backlit
LED Off
Default
LEDs
On
Off
Restoring Default Settings
This is used to restore the factory settings.
Setup...
Backlit
LED Off
Default
Default
settings
No
Ye s
About
Displays model number and firmware
version.
TopMenu...
Key...
Setup...
About
About
DCHT
V1.10
/1.10

Digital Transmitter
Rio Rancho, NM 15
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 connec-
tor to fit the most common type of USB jack used on
computers.
UPDAT E
Put the transmitter in UPDATE mode
by simultaneously holding down
the UP and DOWN arrow buttons
on the transmitter control panel
while powering it up.
Refer to Help in Wireless Designer
software for instructions.
DCHT
V1.10
/1.10
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 firm-
ware 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: Selectable; 10, 25 or 50 mW
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
Specifications subject to change without notice

DCHT, DCHT/E01
LECTROSONICS, INC.
16
Input Connections
The 6-pin input jack accommodates two discrete chan-
nels 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
1
2
3
4
5
6
TA6FLX connector
viewed from outside
Refer to the Accessories section of this manual for
details on the available adapter cables.
The mating connector for the DCHT, DCHT/E01 in-
put jack is a Switchcraft TA6FLX 6-pin female (nickel
plated).
Lectrosonics P/N 21932.
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.
1
2
3
4
5
PIN
SHIELD
AUDIO
1
2
3
45
TA5F
PLUG
2.7 k
2 VOLT NEGATIVE BIAS 2-WIRE ELECTRET
Compatible wiring for microphones
such as negative bias TRAM models.
NOTE: The resistor value can range from 2k to 4k ohms.
Fig. 2
Fig. 1
1
2
3
4
5
PIN
SHIELD
AUDIO 1
2
3
4 5
TA5F
PLUG
3.3 k
1.5 k
2 VOLT POSITIVE BIAS 2-WIRE ELECTRET
Compatible wiring for microphones such as
Countryman E6 headworn and B6 lavaliere. Also see Fig. 9
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.

Digital Transmitter
Rio Rancho, NM 17
Microphone Cable Termination
for Non-Lectrosonics Microphones
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.
Shield
Insulation
Crimp these
fingers to
contact the
shield
Crimp these
fingers to
clamp the
insulation
Mic Cable Stripping Instructions
0.15"
0.3"
1
2
3
4
5
6
VIEWED FROM
OUTSIDE
TA6F Connector Assembly

DCHT, DCHT/E01
LECTROSONICS, INC.
18
DCHTRemote
By New Endian LLC
DCHTRemote is a mobile application for iOS operat-
ing 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 con-
figured 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 inter-
preted 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 how-
ever 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.

Digital Transmitter
Rio Rancho, NM 19
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 con-
nector.
Antenna Model Freq Range (MHz) Gain (dBi)
AMM19 470.100 - 537.500 2.15
AMM22 537.500 - 607.950 2.15

DCHT, DCHT/E01
LECTROSONICS, INC.
20
Accessories
26895: Wire belt clip
BCSLEBN: Spring-loaded belt clip
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.
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 connec-
tion to microphone level signals. 18 inch length.
MCTA6TA3F2: Line level signals from two TA3-M out-
puts. 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.