Lectrosonics duet 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 re-
ceiver (see receiver manual).
WARNING: Moisture, including talent’s sweat,
will damage the transmitter. Wrap the DCHT
in a plastic baggie, our silicone cover (order
part # DCHTCVR) or other protection to avoid
damage.

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 O............................................................ 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
Specications ....................................................................... 15
Input Connections ............................................................... 16
Microphone Cable Termination
for Non-Lectrosonics Microphones ............................ 17
LectroRM............................................................................... 18
Supplied Accessories........................................................... 20
Optional 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
DCHR or M2R, part of digital camera hop systems) 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 fourth generation digital design features specially
developed, high efficiency digital circuitry for extended
operating time on two AA batteries. The transmitter can
tune in 25 kHz 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 for analog
sources, and settings are included for any lavaliere
microphone, dynamic microphones, line level inputs,
and AES digital 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 bypassed.
The housing is constructed of solid machined alumi-
num 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
microB 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
For analog sources, the transmitter employs a DSP-con-
trolled 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 maintain-
ing low distortion. It can be thought of as two limiters
in series, connected 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 ac-
tion 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
privacy is essential, such as during professional sport-
ing events, in court rooms or private meetings. For
instances where your audio transmission needs to be
kept secure, without sacricing audio quality, Lectroson-
ics implements AES256 encryption in our digital wireless
microphone systems. High entropy encryption keys are
rst created by one of the units in the system. The key
is then synced with another encryption-capable unit, via
the IR port. The audio will be encrypted and can only be
decoded if both the transmitter and receiver have the
matching 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.
4
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 appropriate
antenna for maximum operation. Two antennas are
included with the transmitter, and are shipped from
the factory pre-cut and fully assembled. Each an-
tenna 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
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 connector 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 o completely.
Rechargeable batteries give little or no warning when
they are depleted. If you wish to use these batteries in
the transmitter, the most accurate way to determine run-
time 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 rm 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 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 (transmitting) status.
Connecting the Signal Source
Microphones, line level audio and digital sources 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 dier-
ence in voltage drop between alkaline and lithium batter-
ies across their usable life, so it’s important to select the
correct battery type in the menu.
WARNING: Risk of explosion if the battery is replaced by an
incorrect type.
Because rechargeable batteries run down quite abruptly,
using the Power LED to verify battery status will not be
reliable. However, it is possible to track battery status us-
ing 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 may
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.
6
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 O
Powering On in Operating Mode
Press and hold the Power Button for a few seconds
until the progress bar on the LCD nishes.
When you release the button, the unit will be operational
with the RF output turned on and the Main Window dis-
played. You can also use the programming switch if it is
congured for this function.
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 nishes, will turn the unit on
with the RF output turned o. 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 O
Powering
O...
To turn the unit o, press and hold
hold the Power Button for a few
seconds and wait for the progress bar
to nish, or use the programmable
switch (if it is congured for this
function).
If the power button is released, or
the top panel switch is turned back on again before the
progress bar nishes, 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 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.
-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
(Transmit or
Standby)
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 enabled.
470.100
-40 -20 +0
DCHT
MUTE
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.
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.
8
LCD
Menu
Map
Input... SEL
BACK
SEL
BACK
Freq.
Xmit... 470.675
Press MENU/SEL to highlight MHz or kHz or to
select a Frequency Group
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
Rf On?
SEL
BACK
GetAll
GetAll
Sync Press UP arrow button to begin sync
SEL
BACK
SendAll SendAll
Sync Press UP arrow button to begin sync
SEL
BACK
IR&Key
GetFrq 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
Compat SEL
BACK
Compat
Duet
DCHX
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
KeyType SEL
BACK
KeyType
Shared
Select option with arrow buttons:
Shared, Standard, Volatile,
Universal
Grp 1
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
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
Make
Key
SEL
BACK
SendKey SendKey
Sync
Press UP arrow button to begin sync
WipeKey
SEL
BACK
WipeKey?
No
Yes
Select option
with arrow
buttons
No
Yes
Enable
Ignore
Yes
No
SEL
BACK
NameTx NameTx
Press MENU/SEL to confirm
and move cursor to next
position; 8 characters available
Select character with
arrow buttons
SEL
BACK
Flex...
Flex...
SendTx
SendCh1
SendCh2
SEL
BACK
SendTx
Sync
Select option with arrow buttons:
SendTx, SendCh1, SendCh2,
SendM12, NameTx, NameCh1,
NameCh2
BatType
SEL
BACK
BatType
Alk.
Lith.
Select option with arrow buttons
NOTE: The key
menu selections
only show
when DCHX
compatibility
mode (encryption)
is selected and
a key type other
than Universal 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 Digital Inputs
For 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.
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 -40 -20 0
Gain
25
-40 -20 0
Gain
25
20
21
Setup screen in
Linked mode
Setup screen in
Independent mode
3) If using a microphone, position it 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 source 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 icker red during the loudest peaks.
5) Turn the recorder or mixer 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 instruc-
tions, and do not change it to adjust the audio
output level of the receiver.
7) If the audio source drives the inputs into limiting,
the audio level meter will move all the way to the
right and terminate in a small box with an “L” in
it, indicating limiting. If this happens on anything
other than brief peaks, then the audio gain is set
too high.
Selecting the Low Frequency Roll-o
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 dis-
tracting, 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
conguration is set with the InpCfg1 and InpCfg2 menu
items.
Input...
InType
InpCfg1
InpCfg2
InType
Analog
AES
Selecting Input Conguration
When the input type is set to Analog, InpCfg1 and In-
pCfg2 menus are used to congure the audio input for
the respective channels. Use the and arrow but-
tons to select the input type.
Input...
InType
InpCfg1
InpCfg2
InpCfg1
Line In
InpCfg2
Oth Lav
-40 -20 0
Gain
25
L

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 congurable microphone level
* Separate listings for these microphones are included for
convenience, however, they are all the same congura-
tion.
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 oers multiple
ways to browse the available frequencies.
Xmit...
Freq
TxPower
Rf On?
Freq.
494.500
Grp 4
Freq.
494.500
Grp 4
Press the MENU/SEL button to select each eld. Use the
and arrow buttons to adjust the frequency. Each eld
will step through the available frequencies in a dierent
increment, or select the Frequency Group.
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...
TxPower
Compat
Rf On?
TxPower
10 mW
25 mW
50 mW
Turning Rf On/O
Turn Rf o 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.
Compatibility Mode
Selecting Receiver Compatibility Mode
The transmitter can be set to operate with dierent re-
ceivers:
Duet: M2R digital IEM/IFB receiver
DCHX: DCHR and M2R-X encrypted (FW v3.x)
TopMenu
Input
Xmit
Compat
Compat
Duet
DCHX

DCHT, DCHT/E01
LECTROSONICS, INC.
12
IR&Key Menu
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
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 limiter set-
tings.
NOTE: The GetAll function is designed for trouble shoot-
ing and allows for settings to be cloned to transfer to
another receiver if there is a problem to be identied. 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 trans-
fer to another receiver if there is a problem to be identi-
fied. Not all settings are available on the DCHT, DCHT/
E01.
Press the arrow
button to begin sync
GetAll
Sync
SendAll
Sync
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-ca-
pable 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
transmitters/receivers via the IR port.
• Standard: Standard Keys are unique to the DCHT
and there are only 255 key instances available to
be transferred to a receiver.
• 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 Transmit-
ter and an encryption capable receiver remains on
during a single session. If the receiver is powered
o, but the DCHT has remained turned on, the Vol-
atile Key must be sent to the receiver again. If the
power is turned o on the DCHT, the entire session
concludes and a new Volatile Key must be gener-
ated by the transmitter and sent to the receiver via
the IR port. Similar to Standard Keys, there are only
255 key instances to be transferred to a receiver.
MakeKey
When the transmitter key type is set to Volatile, Standard
or Shared, use this menu item to create a unique key that
can be synced with an encryption capable receiver.
WipeKey
This menu item is only available if there is a key 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 (under IR&Key) 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 En-
cryption key to another transmitter or receiver via the
IR port.
Key...
MakeKey
WipeKey
SendKey
SendKey
Send

Digital Transmitter
Rio Rancho, NM 13
Flex List
Name
Name the DCHT, DCHT/E01 to allow easy identica-
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.
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
Setup Menu
Selecting AutoOn Feature
If external power is switched o 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-
gured using the menu to provide several functions:
• (none) - disables the switch
• Mute - mutes the audio when switched on; LCD
will blink a message
• Power - turns the power on and o
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.
Enable/Disable Remote Control Function
The “dweedle tone” remote control is turned on or o
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.

DCHT, DCHT/E01
LECTROSONICS, INC.
14
Selecting Battery Type
The voltage drop over the life of dierent batteries varies
by type and brand. Be sure to set the correct battery type
for accurate indications and warnings. The menu oers
alkaline or lithium types.
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. Re-
chargeable batteries maintain a fairly constant voltage
across the operating time on each charge and stop work-
ing 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...
NameTx
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/
O).
• Sync functions are still available (except Get Freq.
and Get All).
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 O/On
Options to turn the control panel LEDs on or o.
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 rmware
version.
TopMenu...
Key...
Setup...
About
About
DCHT
V1.15
/1.10

Digital Transmitter
Rio Rancho, NM 15
Firmware Update
Instructions
Firmware updates are made with a le downloaded from
the web site and the DCHT or DCHT/E01 connected via
USB, and Wireless Designer software.
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 t
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 power-
ing it up.
Refer to Help in Wireless Designer
software for instructions.
DCHT
V1.10
/1.10
Once the Update has completed, turn
o the transmitter, then turn it back on
to verify that the rmware version on
the transmitter LCD matches the
rmware version shown on the web
site. The rmware is the second LCD
display during boot up sequence.
Specications
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
Operating temp. range: Celsius: -20° - 50°; Farenheit: -5° - 122°
Frequency Selection Steps: 25 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 (o) function
• Front panel membrane switches with LCD
interface for power on/o and all setup and
conguration controls
Audio Input Jack: Switchcraft 6-pin locking (TA6F)
Antenna: Galvanized steel, exible wire, SMA connector
Battery: Two AA Lithium recommended
Battery Life: 5 hours
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
Specications subject to change without notice
WARNING: Do not connect more than one
Lectrosonics device to your computer while
updating firmware. Wireless Designer may
need to be updated to the current version to
perform a firmware update on recent products

DCHT, DCHT/E01
LECTROSONICS, INC.
16
Input Connections
Lavalier microphones and adapter cabling used with digi-
tal body pack transmitters should have the shield wire
connected to the shell of the microphone plug.
This will reduce the RF energy radiated into the micro-
phone cable shield wire from getting back into the trans-
mitter via the audio input.
Digital RF carriers contain both FM and AM components
and greater microphone shielding is required to over-
come induced transmitter radio frequency interference.
The 6-pin input jack accommodates two discrete chan-
nels at microphone or line levels. The input connections
are congured 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
6TA6FLX connector
viewed from outside
Refer to the Accessories section of this manual for de-
tails 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.
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 gures 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.
AES IEC Type 1 and 2 Wiring (TA6F to XLRF)
Type 1 interface: Type I connections use balanced,
3-conductor, 110-ohm twisted pair cabling with XLR con-
nectors. Most often used in professional installations and
are considered the standard connector for AES3. Wire as
shown.
Type 2 interface: A 75-ohm unbalanced electrical or op-
tical interface for consumer electronics applications (less
common). Connect pin 4 to the center pin of the connec-
tor. Connect pin 5 to the connector shell. Shield (pin 1 of
the TA6) is unused.

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
ngers to
contact the
shield
Crimp these
ngers 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 re-
ceived by the attached microphone, will alter the cong-
ured 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 conguration change. The
settings available in DCHTRemote are:
• Audio Level (Gain)
• Frequency
• Sleep Mode
• Lock Mode
• Output Power
• Low Frequency Roll-o
• LED on/o
Activation
For the DCHT to respond to remote control audio tones,
the transmitter must:
• The transmitter must not be turned o; 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 connector.
Antenna Model Freq Range (MHz) Gain (dBi)
AMM19 470.100 - 537.500 2.15
AMM22 537.500 - 607.950 2.15
Supplied Accessories
AMJ19
Swiveling Whip Antenna with Standard SMA Connector,
Block 19.
AMJ22
Antenna with swiveling SMA connector, Block 22.
40073 Lithium Batteries
DCHR is shipped with two (2) batteries. Brand may vary.
Optional Accessories
26895: Wire belt clip
BCSLEBN: Spring-loaded belt clip

DCHT, DCHT/E01
LECTROSONICS, INC.
20
Optional Accessories
(cont.)
LTBATELIM: Replaces the batteries for powering the
DCHT, DCHT/E01 from external DC, 5 to 25 volts.
MCTA6AESXLRF: AES3 digital signal from XLR-F out-
put. 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 con-
nection 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 out-
puts. 18 inch length.
DCHTCVR
This tough silicone cover protects the DCHT from
moisture and dust. The pliable material and the two-part
design make it easy to install and remove. Cutouts for
the antenna and jacks and the raised dome for the LED
provide a snug t.