Lectrosonics LT Series User manual

Fill in for your records:
Serial Number:
Purchase Date:
This guide is intended to assist with
initial setup and operation of your
Lectrosonics product.
For a detailed user manual, down-
load the most current
version at:
www.lectrosonics.com/manuals
LT
Digital Hybrid
Wireless® Belt-Pack
Transmitter
LT, LT/E06, LT/X
U.S. Patent 7,225,135
Quick
Start
Guide
18 July 2019

LECTROSONICS, INC.2
Controls and Features
PWR/FUNC
-10
-20
AUDIO
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RF Indicator
Battery icon
IR Sync Port
Battery Status
LED
Menu
Navigation
Buttons
Power Button
Input Jack
Programmable Switch
Power/Function
LED
Modulation
LEDs
Full access to all settings is provided through the keypad and LCD. The trans-
mitter can also be configured as a “one button” device by locking the ability to
make changes with the keypad, and configuring the top panel switch as either
power on/off or a mute function.

www.lectrosonics.com 3
Keypad and LCD Interface
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IR Port
BATT LED
Glows green when the batteries are good. As the batteries are drained, the
LED will turn to a steady red at a mid-point during their life, then begin to blink
red when only a few minutes of operation remain.
MENU/SEL Button
Pressing this button enters the menu and selects menu items to enter the
setup screens.
BACK Button
Pressing this button returns to the previous menu or screen.
Power Button
Turns the unit off and on and enters the power menu.
Arrow Buttons
Used to navigate the menus.
IR (infrared) Sync
The opening on the keypad is an IR port for quick setup using a receiver with
this function available. IR Sync will transfer the settings for frequency, step
size and compatibility mode from the receiver to the transmitter.
NOTE: If a mismatch exists between the receiver and transmitter, an
error message will appear on the transmitter LCD stating what the
problem is.

LECTROSONICS, INC.4
Navigating the Menus
Menu setup items are arranged in a vertical list on the LCD. Press MENU/SEL
to enter the menu, then navigate with the UP and DOWN arrows to highlight
the desired setup item. Press MENU/SEL to enter the setup screen for that
item.
Gain
SEL
BACK
Gain 22
Use arrow keys to
select input gain
LineIn
Freq.
ProgSw
Rolloff
Compat
StepSiz
Phase
Locked
Rf On?
BatType
Remote
TxPower
Default
SEL
BACK
Use arrow keys to select
audio output polarity
Line
Instr.
Polarity
SEL
BACK
Freq Press SEL to
select desired
adjustment
Use arrow keys
to select desired
frequency
SEL
BACK
ProgSw
Use arrow keys to select
LCD backlight duration
TalkBk
Power
Mute
(none)
SEL
BACK
SEL
BACK
Compat Select from
listing
Use arrow keys to select
compatibility mode
SEL
BACK
Use arrow keys to select
frequency step size
100 kHz
25 kHz
StepSiz
SEL
BACK
Use arrow keys to select
audio output polarity
Pos.
Neg.
Phase
SEL
BACK
Use arrow keys to
lock/unlock keypad
Yes
No
Locked?
SEL
BACK
Use arrow keys to turn Rf
signal on/off
No
Yes
Rf On?
SEL
BACK
Use arrow keys to
choose battery type
Alk.
Lith.
BatType
SEL
BACK
Use arrow keys to
enable/disable remote
Enable
Ignore
Remote
SEL
BACK
Use arrow keys to select
RF power output
50 mW
100 mW
TxPower
SEL
BACK
Use arrow keys to return
transmitter to default factory
settings
No
Yes
Default
settings
Rolloff
70 Hz
Use arrow keys to
select input gain
Select from
listing
b 21
80
550.400
Select from
listing
Hybrid

www.lectrosonics.com 5
Power Menu
Pressing the power button when the unit is turned on will display a menu
with several options:
• Resume - returns to the previous mode and screen
• Pwr Off - turns the unit off irrevocably
• Rf On? - enters a screen to enable the operating or standby modes
• AutoOn? - allows the unit to automatically power back up after a power
failure or when new batteries are installed (works in the operating mode
only)
• Backlit - the backlight can be turned on conitnuously or set to turn off
automatically after either 30 seconds or 5 minutes.
• LED Off - gives you the option of the battery indicator light normal or
dark.
• About - Indicates latest firmware version
Resume
Rf On?
AutoOn?
Pwr Off
Resume and Pwr Off
will execute
the command
immediately
Resume
Pwr Off
Rf On?
AutoOn?
Rf On?
No
Ye s
Resume
Rf On?
AutoOn?
Pwr Off
AutoOn?
No
Ye s
Resume
Rf On?
AutoOn?
Pwr Off
Rf On?
AutoOn?
Backlit
LED Off
AutoOn?
Backlit
LED Off
About
Pwr Off
Rf On?
AutoOn?
Backlit
The next two menu
items will open a
screen asking for a
Yes or No answer

LECTROSONICS, INC.6
System Setup Procedures
Summary of Steps
1) Install good batteries and turn power on.
2) Set the compatibility mode to match the receiver.
3) Connect the signal source and adjust input gain for optimum
modulation level.
4) Set Step Size and frequency to match receiver. Also see receiver
manual for scanning procedure to find a clear operating frequency.
5) Turn on the receiver and verify that solid RF and audio signals are pres-
ent (see receiver manual).
1) Install Batteries
Insert the batteries according to the markings on the back of the housing.
2) Set Compatibility Mode
When used with a Lectrosonics Digital Hybrid Wireless®receiver, the best
audio quality will be achieved with the system set to the Nu Hybrid compat-
ibility mode.
Rolloff
Compat
StepSiz
Phase
Compat
Nu Hybrid
Use the UP and DOWN arrows to select the desired mode, then press the
BACK button twice to return to the Main Window.
Compatibility modes are as follows:
Receiver Models
• Nu Hybrid
• IFB
• Mode 3

www.lectrosonics.com 7
3) Adjusting Input Gain
The two bicolor Modulation LEDs on the control panel and keypad 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 -20 LED -10 LED
Less than -20 dB Off Off
-20 dB to -10 dB Green Off
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 dB Red Red
NOTE: Full modulation is achieved at 0 dB, when the “-20” LED first
turns red. The limiter can cleanly handle peaks up to 30 dB above this
point.
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.
Gain
LineIn
Freq.
ProgSw -40 -20 0
Gain
25
3) Prepare the signal source. 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 instrument or audio
device to the maximum level that will be used.
4) Use the and arrow buttons to adjust the gain until the –10 dB glows
green and the –20 dB LED starts to flicker red during the loudest peaks
in the audio.
5) Once the audio gain has been set, the signal can be sent through the
sound system for overall level adjustments, monitor settings, etc.
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 trans-
mitter gain adjustment set according to these instructions, and do not
change it to adjust the audio output level of the receiver.
Continued on Next Page

LECTROSONICS, INC.8
4) Select Step Size
This menu item allows frequencies to be selected in either 100 kHz or 25 kHz
increments.
Rolloff
Compat
StepSiz
Phase
StepSiz
100 kHz
25 kHz
StepSiz
100 kHz
25 kHz
If the desired frequency ends in .025, .050 or .075 MHz, the 25 kHz step size
must be selected.
Normally, the receiver is used to find a clear operating frequency. All Lectro-
sonics Digital Hybrid Wireless®receivers provide a scanning function to quick-
ly and easily find prospective frequencies with little or no RF interference. In
other cases, a frequency may be specified by officials at a large event such as
the Olympics or a major league ball game. Once the frequency is determined,
set the transmitter to match the associated receiver.
Selecting Frequency
The setup screen for frequency selection offers several ways to browse the
available frequencies.
Gain
LineIn
Freq.
ProgSw
Freq.
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Press MENU/
SEL to select
one of four
fields to make
adjustments
Each field will step through the available frequencies in a different increment.
The increments are also different in the 25 kHz mode from the 100 kHz mode.
Freq.
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Freq.
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These two fields step in 25
kHz increments when the
step size is 25 kHz and 100
kHz increments when the
step size is 100 kHz.
Freq.
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Freq.
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These two fields
always step in the
same increments
1 MHz steps
1 block steps

www.lectrosonics.com 9
A fraction will appear next to the hex code in the setup screen and in the main
window when the frequency ends in .025, .050 or .075 MHz.
494.525
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MUTE
1
4
51
Freq.
b 19
494.525
511
4
Fraction appears
next to hex code
in 25 kHz mode
Selecting Frequency Using Two Buttons
Hold the MENU/SEL button in, then use the and arrow buttons for alter-
nate increments.
Freq.
b 19
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1 block steps
1.6 MHz steps to
nearest 100 kHz
channel
1 MHz step 100 kHz steps
to next 100 kHz
channel
100 kHz Mode
Freq.
b 19
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511
4
1 block steps
1.6 MHz steps
1 MHz step
25 kHz steps
25 kHz Mode
If the Step Size is 25 kHz with the frequency set between even 100 kHz steps
and the Step Size is then changed to 100 kHz, the mismatch will cause the
hex code to display as two asterisks.
494.525
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b 19
MUTE
Freq.
b 19
494.500
**
Step Size and
Frequency
mismatch

LECTROSONICS, INC.10
Main Window Indicators
The Main Window displays the block number, Standby or Operating mode,
operating frequency, audio level, battery status and programmable switch
function. When the frequency step size is set at 100 kHz, the LCD will look
like the following.
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1
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MUTE
Block number
Frequency (MHz)
Frequency
(hex number)
Operating mode
Battery status
Programmable
switch function
Audio level
When the frequency step size is set to 25 kHz, the hex number will appear
smaller and may include a fraction.
Note that the
frequency has
increased by 25
kHz from the upper
example.
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MUTE
1
4
51
Fraction
1/4 = .025 MHz
1/2 = .050 MHz
3/4 = .075 MHz
Changing the step size never changes the frequency. It only changes the way
the user interface works. If the frequency is set to a fractional increment be-
tween even 100 kHz steps and the step size is changed to 100 kHz, the hex
code will be replaced by two asterisks on the main screen and the frequency
screen.
494.525
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b 19
MUTE
Freq.
b 19
494.525
Frequency set to
fractional 25 kHz
step, but step size
changed to
100 kHz.
If the programmable switch function is set for Mute, the Main Window will
indicate that the function is enabled.
51
494.500
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b 19
MUTE
Mute function
enabled but
not active