Page 1
WM
Watertight Transmitter
With Digital Hybrid Wireless® Technology
US Patent 7,225,135
INSTRUCTION MANUAL
Fill in for your records:
Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
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WM
Introduction
The WM transmitter is designed to resist damage
when used in wet or dusty conditions and also offer
a comprehensive feature set that makes it equally at
home in film and television production and on stage.
A solid machined aluminum housing with a corrosion
resistant finish hosts dual battery compartments, a
moisture sealed control panel with backlit LCD and
enlarged membrane switches. Recessed seats for the
O-rings in the battery caps and input jack allow the
caps and mic connector to be tightened securely without excessive deformation of the O-rings.
The antenna is made of an extremely durable, multistrand alloy that will withstand heavy abuse. It is
mounted with a compression sealed strain relief that
prevents dust and moisture from entering the housing.
As the first stage in the signal processing chain, the
input preamp section includes very high quality, low
noise components with a wide range of gain adjustment in 1 dB increments and a DSP-controlled input
limiter. Dual color LEDs on the control panel accurately
indicate audio input level for precise gain adjustment.
Easily accessed screens on the LCD simplify setup
and adjustments.
Output power is adjustable to provide either extended
operating range or extended battery life as needed for
the application.
The Digital Hybrid Wireless® design (US Patent
7,225,135) combines 24-bit digital audio with analog
FM resulting in a system that has the same operating
range as analog systems, the same spectral efficiency
as analog systems, the same long battery life as analog systems, plus the excellent audio fidelity typical of
pure digital systems.
The DSP-based design works with all Digital Hybrid
receivers, and is backward compatible for use with
Lectrosonics 200 Series, 100 Series, IFB receivers
and some other brands of analog wireless receivers.
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LECTROSONICS, INC.
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Watertight Transmitter
Table of Contents
Introduction .............................................................................................................................................................................................2
General Technical Description ..............................................................................................................................................................4
Servo Bias Input....................................................................................................................................................................................4
No Pre-Emphasis/De-Emphasis ...........................................................................................................................................................4
Low Frequency Roll-Off ........................................................................................................................................................................4
Input Limiter ..........................................................................................................................................................................................4
Signal Encoding and Pilot Tone ............................................................................................................................................................5
Microprocessor Control .........................................................................................................................................................................5
Compatibility Modes ..............................................................................................................................................................................5
Control Panel ........................................................................................................................................................................................5
Wide-Band Deviation ............................................................................................................................................................................5
Variable Power Output ..........................................................................................................................................................................5
Battery Operation .................................................................................................................................................................................. 5
Output Isolator ......................................................................................................................................................................................5
Controls and Functions .........................................................................................................................................................................6
LCD Screen ..........................................................................................................................................................................................6
Power LED ............................................................................................................................................................................................ 6
Audio Input Jack ....................................................................................................................................................................................6
Battery Compartment and Thumb Screw ..............................................................................................................................................6
Modulation LEDs ...................................................................................................................................................................................6
AUDIO Button .......................................................................................................................................................................................6
FREQ Button .........................................................................................................................................................................................6
Up/Down Arrows ...................................................................................................................................................................................6
Antenna .................................................................................................................................................................................................6
Battery Compartments ........................................................................................................................................................................... 7
About Batteries .......................................................................................................................................................................................7
Input Connector ......................................................................................................................................................................................7
Equivalent Input Circuit Diagram ..........................................................................................................................................................7
Operating Instructions ...........................................................................................................................................................................8
Power Up and Boot Sequence .............................................................................................................................................................. 8
Power Down ..........................................................................................................................................................................................8
Standby Mode .......................................................................................................................................................................................8
Menus and Settings ................................................................................................................................................................................9
UP Arrow Settings ..................................................................................................................................................................................9
Compatibility Mode ...............................................................................................................................................................................9
Input Type ..............................................................................................................................................................................................9
RF Power Output ..................................................................................................................................................................................9
LCD Backlight .......................................................................................................................................................................................9
Frequency Step Size ...........................................................................................................................................................................10
DOWN Arrow Settings .......................................................................................................................................................................... 10
Remote Control ...................................................................................................................................................................................10
Auto Power Restore ............................................................................................................................................................................10
Audio Mute ..........................................................................................................................................................................................11
FREQ Button Settings ..........................................................................................................................................................................12
AUDIO Button Settings ........................................................................................................................................................................12
Low Frequency Roll-off .......................................................................................................................................................................12
Input Gain ...........................................................................................................................................................................................12
LectroRM ...............................................................................................................................................................................................13
Troubleshooting ....................................................................................................................................................................................14
Accessories and Replacement Parts ..................................................................................................................................................16
Straight Whip Antennas .......................................................................................................................................................................17
Preventing Corrosion ...........................................................................................................................................................................18
Desiccant Battery Caps .......................................................................................................................................................................18
Battery Door Update.............................................................................................................................................................................18
Re-conditioning (drying out) the caps and desiccant beads ............................................................................................................... 19
Replacing the desiccant beads ...........................................................................................................................................................19
Specifications ......................................................................................................................................................................................20
Service and Repair ...............................................................................................................................................................................22
Returning Units for Repair ..................................................................................................................................................................22
Rio Rancho, NM
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WM
General Technical Description
Servo Bias Input
The voltage and current requirements of the wide variety of electret microphones used in professional applications has caused confusion and compromises in the
wiring needed for wireless transmitters. To address this
problem, the unique Servo Bias input circuit provides
an automatically regulated voltage over a very wide
range of current for compatibility with all microphones.
Digital Hybrid Wireless® Technology
All wireless links suffer from channel noise to some
degree, and all wireless microphone systems seek to
minimize the impact of that noise on the desired signal. Conventional analog systems use compandors for
enhanced dynamic range, at the cost of subtle artifacts
(typically “pumping” and “breathing”). Wholly digital systems defeat the noise by sending the audio information
in digital form, at the cost of some combination of power,
bandwidth and resistance to interference.
Digital Hybrid systems overcome channel noise in a
dramatically new way, digitally encoding the audio in
the transmitter and decoding it in the receiver, yet still
sending the encoded information via an analog FM
wireless link. This proprietary algorithm is not a digital
implementation of an analog compandor but a technique that can be accomplished only in the digital domain, even though the inputs and outputs are analog.
Because it uses an analog FM link, the Digital Hybrid
system enjoys all the benefits of conventional FM wireless systems and it does away with the analog compandor and its artifacts.
No Pre-Emphasis/De-Emphasis
The Digital Hybrid design results in a signal-to-noise ratio
high enough to preclude the need for conventional preemphasis (HF boost) in the transmitter and de-emphasis
(HF roll off) in the receiver. This eliminates the potential
for distortion of signals with abundant high-frequency
information.
Low Frequency Roll-Off
The low frequency roll-off can be set for a 3 dB down
point at 35, 50, 70, 100, 120 and 150 Hz to control
subsonic and very low frequency audio content in
the audio. The actual roll-off frequency will vary slightly
depending upon the low frequency response of the
microphone.
Excessive low frequency content can drive the transmitter into limiting, or in the case of high output sound
systems, it can even cause damage to loudspeaker
systems. The roll-off is normally adjusted by ear while
listening as the system is operating.
Input Limiter
A DSP-controlled analog audio limiter is employed before the A-D converter. The limiter has a range of more
than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought
of as two limiters in series, a fast attack and release
limiter followed by a slow attack and release limiter.
The limiter recovers quickly from brief transients, with
no audible side effects, and also recovers slowly from
sustained high levels to keep audio distortion low while
preserving short term dynamics.
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LECTROSONICS, INC.
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Watertight Transmitter
Signal Encoding and Pilot Tone
In addition to controlling the limiter, the DSP also encodes the digitized audio from the A/D converter and
adds an ultrasonic pilot tone to control the squelch in
the receiver. A pilot tone squelch system provides a reliable method of keeping a receiver output muted (audio
mute) even in the presence of significant interference.
When the system is operating in the Nu Hybrid mode,
a different pilot tone frequency is generated for each
carrier frequency to prevent inadvertent squelch problems in multi-channel sytems.
Microprocessor Control
A microprocessor monitors user command inputs from
the control panel buttons and numerous other internal
signals. It works intimately with the DSP to ensure the
audio is encoded according to the selected Compatibility Mode and that the correct pilot tone is added to the
encoded signal.
Compatibility Modes
Along with providing peerless audio quality with wide
frequency response and dynamic range in Nu Hybrid
mode, the technology used in the WM Transmitter
includes compatibility modes for Lectrosonics Mode 3
and IFB receivers.
Control Panel
The control panel includes four membrane switches and
an LCD screen to adjust the operational settings. Multicolor LEDs are used to indicate audio signal levels for
accurate gain adjustment and for battery status.
Wide-Band Deviation
±75 kHz deviation improves the signal to noise ratio and
audio dynamic range of a wireless system dramatically,
compared to other designs that use ±30 kHz to 40 kHz
deviation. Wide deviation combined with a high powered transmitters makes a significant improvement in
signal to noise ratio and operating range.
Battery Operation
Switching power supplies convert battery voltages to
operate various circuit stages with maximum efficiency.
The firmware “remembers” the settings when the batteries are exhausted. After new batteries are installed,
a quick press of the AUDIO and FREQ buttons will turn
the power back on and return to the previous settings.
This is a unique behavior that takes place only when
the batteries fail during operation. If the unit is turned
off manually, a quick press of the buttons will turn it on
in the “standby” mode instead.
Because the battery caps make contact with the battery before the cap is seated, the power does not turn
back on automatically. This allows both batteries to
be installed and the caps tightened before power is
restored.
Output Isolator
The RF output circuit includes a magnetically polarized
ferrite called an isolator that suppresses IM (intermodulation) that can take place in the final amplifier.
IM in this case would result from external RF signals
from outside sources entering a transmitter through its
antenna and appearing in the final amplifier. These signals can then mix with the transmitter’s output signal to
create new interfering signals.
The isolator works like a one-way “check valve” that
lets the intended signal generated in the transmitter
travel to the antenna to be transmitted, but it directs
RF signals coming back into the antenna from outside
sources to ground and keeps them from entering the
final amplifier. This greatly reduces IM produced when
multiple transmitters are used in close proximity to one
another (several feet apart). The isolator also provides
additional RF output stage protection against static
shock.
Variable Power Output
This advanced feature allows the operator to optimize
the transmitter for maximum battery life, or for maximum operating range. Power output is selected using
the LCD in a setup mode while the RF output of the
transmitter is turned off.
Rio Rancho, NM
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WM
Controls and Functions
Modulation
LEDs
LCD
Audio
Input Jack
PWR LED
AUDIO
Button
FREQ
Button
LCD Screen
The display is a highly visible, backlit LCD with screens
for making all setup and level adjustments. The transmitter can be powered up with or without the RF output
turned on. With the RF output turned off, all adjustments can be made without creating interference for
other wireless systems in the vicinity.
For normal powering up and down, a countdown appears in the LCD. The buttons must be pressed for
the duration of the countdown, which helps to prevent
accidentally turning the transmitter on or off.
Power LED
The PWR LED glows green when the battery is good.
The color changes to red when there is about 30
minutes of operation left with the recommended lithium
battery. When the LED begins to blink red, there are
only a few minutes of life.
A weak battery will sometimes cause the PWR LED
to glow green immediately after the unit is turned on,
but will soon discharge to the point where the LED will
turn red or the unit will turn off completely. When the
transmitter is in SLEEP mode, the LED blinks green
every few seconds.
Audio Input Jack
This is a threaded locking connector that accepts the
Lectrosonics watertight WP connector.
Battery Compartment and Thumb Screw
The large knurled thumbscrews are retain the batteries
and maintain solid battery contact. The lanyard keeps
the battery caps attached, but it can be removed if
desired using a 1/16 inch hex key (Allen wrench).
UP Arrow
Battery
Compartment
Caps
DOWN Arrow
Modulation LEDs
Proper input gain adjustment is critical to ensure the
best audio quality. Two red/green LEDs will glow to accurately indicate modulation levels. The input circuitry
includes a wide range DSP-controlled limiter to prevent
distortion during high peak levels.
It is important to set the gain (audio level) high enough
to achieve full modulation during louder peaks in the
audio. The DSP-controlled limiter can handle peaks
over 30 dB above full modulation, so with an optimum
setting, the LEDs will flash red during use. If the LEDs
never flash red, the gain is too low. The -20 LED turns
red at 0 dB (full modulation).
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
AUDIO Button
The AUDIO button is used to display the gain and low
frequency roll-off settings. The UP and DOWN arrows
adjust the values. This button is also used with the
FREQ button to enter standby mode and to power the
transmitter on or off.
FREQ Button
The FREQ Button displays the selected operating frequency and also toggles the LCD between displaying
the actual operating frequency in MHz and a two-digit
hexadecimal number that corresponds to the equivalent Lectrosonics Frequency Switch Setting. This button is also used with the AUDIO button to enter standby
mode and to power the transmitter on or off.
Up/Down Arrows
The Up and Down arrow buttons are used to select the
values on the various setup screens and to lock out
the control panel. Pressing both arrows simultaneously
enters the lock countdown. When an attempt is made
to change a setting while the control panel is locked,
a message will flash on the LCD as a reminder that
the unit is locked. Once locked, the buttons can only
be unlocked by removing the batteries, or with the RM
remote control.
Antenna
The fixed whip antenna is constructed with a flexible,
woven, galvanized steel mesh cable.
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LECTROSONICS, INC.
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Watertight Transmitter
d
+5 VDC
Battery Compartments
The battery compartments are a rugged, straightforward design with a recessed entry that captures
the O-ring on the cap. The spring contact on the cap
maintains solid contact on the battery regardless of its
exact length.
The O-rings should be kept clean and dry, and coated
with petroleum jelly on a regular basis. See page 11 for
more information on preventing corrosion.
Battery polarity
is marked on the
rear cover
Input Connector
The threaded WP watertight plug on the microphone cable fits into a recessed jack on the top panel. The recess
in the opening retains the O-ring when the plug is tightened. The Lectrosonics M152WP lavaliere microphone is
supplied with the WP plug already installed. Other microphones can also be terminated with this plug by following
the instructions included with the WP connector kits.
Treat O-ring with petroleum jelly before
connecting (see page 11)
Equivalent Input Circuit
Diagram
Do not cover
vent holes
•
•
•
•
•
DO NOT COVER
VENT HOLES
Unscrew battery
caps to insert
batteries
About Batteries
The transmitter is powered by two AA batteries.
Lithium batteries are recommended for longest life,
which typically provides over 7.5 hours of operation at
room temperature with the output set to 250 mW. At 50
mW, the runtime is typically over 14 hours with lithium
batteries.
The PWR LED glows green when the battery is good.
The color changes to red at a mid-point of operating
life, and will continue to glow red until the battery gets
close to the end of its life. When the LED begins to
blink red, there are only a few minutes remaining.
The exact point at which the LED turns red will vary
with battery brand and condition, temperature and current drain. The LED is simply a reminder intended to
catch your attention, not an exact indicator of remaining time.
WM Equivalent
Input Circuit Wiring
closed for mic level
open for line level
MIC
GND
(menu item)
20k
332 Ohm
200 Ohm
Servo Bias
0, 2, 4V
Roll-off
35, 50, 70, 100, 120, 150 Hz
(menu selectable)
30uF/10V
100 Ohm
+
To Limiter Control
To Virtual Groun
Audio Amplifier
Rio Rancho, NM
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WM
Operating Instructions
Power Up and Boot Sequence
Simultaneously press and hold the AUDIO and FREQ
buttons until the startup count is completed. The
screen will display a count from 1 to 3 as the unit boots
up, then it switches to the Audio screen. As the unit
turns on, the Modulation LEDs and PWR LED all glow
red, then green, and then revert to normal operation.
The LCD displays a boot sequence which consists of
four screens ending with the audio screen similar to
this example:
• Company name: Lectro
• Frequency block/Firmware Ver.: b22r2.4
• Power level: Pr 100
• Compatibility mode: CP IFB
• Audio (Input gain): Aud 22
Power Down
Simultaneously press and
hold the AUDIO and FREQ
buttons while observing that
the word “OFF” appears in the LCD along with a counter.
The screen will display a countdown from 3 to 1 and the
unit will then turn off.
Lock/Unlock the Keypad
The control panel buttons can be locked out to avoid
inadvertent changes in the settings or turning the
unit off unintentionally. Simultaneously pressing and
holding both the UP and DOWN arrow buttons during
normal operation starts a countdown timer.
The timer starts at three and counts down to zero.
When the timer reaches zero, the transmitter’s controls
are locked.
With the controls locked, the AUDIO and FREQ buttons can still be used to display current settings. Any
attempt to change a setting by pressing either the Up
or Down arrow button will result in an on-screen Loc
reminder that the controls are locked.
Once the transmitter is locked, it cannot be unlocked
or powered off using the buttons. The only ways to
unlock a locked transmitter are to remove the battery
or unlock it via the RM remote control.
Note: If the AUDIO and FREQ buttons are
released before the LCD goes blank at the end of
the countdown, the unit will not turn off. Instead,
it will stay energized and the display will return to
the previous screen.
Standby Mode
With the unit off, quickly
press both AUDIO and
FREQ buttons, and release
before counter reaches “0” to enter the “standby”
mode. In this mode the RF output is turned off so
adjustments can be made without interfering with other
systems operating in the same location. The LCD
displays rf OFF to remind you that the unit is not
transmitting.
Use the AUDIO and FREQ buttons to access the various setup screens. When the adjustments are complete, press both the AUDIO and FREQ buttons briefly
to save the settings and turn the unit off.
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Watertight Transmitter
Menus and Settings
There are four locations for setup options and settings
accessed with the control panel:
• UP Arrow Menu and Settings
• DOWN Arrow Menu and Settings
• AUDIO button settings
• FREQ button settings
UP Arrow Settings
With the unit turned off, hold the UP arrow button and
simultaneously press the AUDIO and FREQ buttons.
Each successive press of the AUDIO button will step
through the setup screens.
• Compatibility Mode
• Input Type
• RF Power Output
• LCD Backlight
• Frequency Step Size
Use the UP and DOWN arrow buttons to scroll through
the options. The selected options will automatically be
stored when the power is turned off. Press both the
AUDIO and FREQ buttons to exit the menu and turn
the power off.
Input Type
The input can be configured for electret or dynamic
microphones or a line level input.
The transmitter features unique Servo Bias input circuitry that automatically adjusts the current to maintain
a selected bias voltage for electret microphone. This
effectively overcomes a traditional problem with variations in output levels and power supply currents of
different microphones.
Press the UP and DOWN arrows to select the desired
input type:
• LInE Bias turned off; line level impedance
• PH oFF Bias turned off for dynamic mics
• PH 2 Bias at 2 volts for electret mics
• PH 4 Bias at 4 volts for electret mics
The correct bias is specified by the microphone manufacturer. 4 volts is typical for most electret lavaliere
microphones. 2 volts is preferred by some mic manufacturers such as Countryman for the very small B6
and E6 models.
Hold the UP
arrow button
Then press the AUDIO and FREQ
buttons at the same time
Note: The unit is automatically set to “standby” in
this setup mode; with rF OFF not displayed.
Compatibility Mode
These modes provide
DSP-based emulations for
use with earlier Lectrosonics
equipment and with some
models from other manufacturers.
• CP NU Hybr: Nu Hybrid mode
• CP IFb: IFB Series mode
• CP 3: Mode 3 (contact the factory
for details)
RF Power Output
This setting provides an
option for the trade-off
between operating range
and battery life. The lowest
power setting provides maximum battery life, and the
highest power setting provides maximum operating
range and can also help to suppress some types of
interference from broadband RF noise.
NOTE: See the specifications for typical
operating times for each power level.
• Pr 50 for maximum battery life
• Pr 100 is an intermediate setting
• Pr 250 for maximum operating range
LCD Backlight
The backlight on the display
can be set to stay on all the
time or to turn off after either
30 seconds or 5 minutes of
inactivity on the panel switches. The backlight will turn
on and the timer will start over when a button is
pressed. Use the UP and DOWN arrow buttons to
select the desired setting.
• bl 5 Stay on for five minutes
• bl 30 Stay on for 30 seconds
• bl on Stay on continuously
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WM
Frequency Step Size
This menu item allows frequencies to be selected in
either 25 kHz or 100 kHz increments. 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 Lectrosonics Digital Hybrid receivers
provide a scanning function to quickly 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.
• Stp 100 Frequency steps in 100kHz increments
• Stp 25 Frequency steps in 25 kHz increments
DOWN Arrow Settings
Hold the DOWN arrow button and simultaneously
press the AUDIO and FREQ buttons. Each successive
press of the AUDIO button will step through the setup
screens.
• Remote Control
• Auto Power Restore
• Audio Mute
Use the UP and DOWN arrow buttons to scroll through
the options. The selected options will automatically be
stored when the power is turned off. Press both the
AUDIO and FREQ buttons to exit the menu and turn
the power off.
Hold the DOWN
arrow button
Then press the AUDIO and FREQ
buttons at the same time
Remote Control
Transmitter settings can be configured using special
tones generated by a smartphone using a remote
control application such as Lectro RM (available on the
AppStore or Google Play). Enable this feature on the
transmitter with the following menu items:
• rc on Enables the remote function
• rc oFF Disables the remote function
If a remote control signal is detected but the function is
turned off, the message rc oFF will be displayed briefly
on the transmitter’s LCD to confirm that a valid signal
was received, but that the transmitter is not configured
to respond to it.
Auto Power Restore
This setting determines how the transmitter is powered
up again after the batteries have become exhausted in
normal operation.
When this function is turned on, the unit will power
up to normal operation with a brief press of the AUDIO and FREQ buttons after the batteries have been
replaced.
When this function is turned off, the AUDIO and FREQ
buttons need to be held in for the completion of the
count to turn the unit back on for normal operation.
This is a unique behavior that takes place only when
the batteries fail during operation. If the unit is turned
off manually, a quick press of the buttons will turn it on
in the “standby” mode instead.
The firmware is written this way because the battery
caps make contact with the battery before the cap
is seated, and the fact that there are two separate
battery caps to tighten. This allows both batteries to
be installed and the caps tightened before power is
restored. It also makes turning the unit back on easier
when wearing gloves since the buttons do not need to
be held in.
• PbAc 1 Turns power restore ON
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LECTROSONICS, INC.
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• PbAc 0 Turns power restore OFF
Audio Mute
Beginning with firmware v2.6 on the US version, the
AUDIO button can be configured to work as a mute
button by turning this setting on. A quick press of the
AUDIO button will then mute the audio and a message
will appear on the LCD confirming that the audio is
muted. Another quick press turns the audio back on.
• At on Enables the audio mute function
• At oFF Disables the audio mute function
During operation, the LCD will continuously display the
state of audio muting as a reminder, showing the audio
as ON or OFF.
The AUDIO button will still work to set Input Gain by
pressing and holding it in for a few seconds, however,
if the audio is muted, no sound will be heard during the
adjustment.
If the transmitter is in “standby,” the Low Frequency
Roll-off can be adjusted whether or not the audio mute
function is enabled. When the audio mute function is
enabled and the unit is turned on and transmitting,
only the audio level (input gain) can be adjusted by
holding the AUDIO button in for a few seconds.
Watertight Transmitter
Rio Rancho, NM
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WM
FREQ Button Settings
The frequency can be displayed either in MHz or as a
two-digit hexadecimal number and it can be set when
the unit is in “standby” or when the transmitter is powered up in the normal operating mode.
MHz Hex Code
The hexadecimal numbering system is unique to
Lectrosonics where two alphanumeric characters correspond to the left and right switch settings on earlier
analog transmitters that had mechanical rotary switches to adjust frequency.
• Press the FREQ button repeatedly to toggle
between either the MHz screen or the Hex Code
screen.
• While holding the FREQ button, use the UP or
DOWN arrow buttons to move the operating frequency up or down from the current setting.
The two-digit hex code is easier to remember, which
can be handy when setting up a multi-channel system.
AUDIO Button Settings
Low Frequency Roll-off
It is possible that the low
frequency roll-off point could
affect the gain setting, so it’s
generally good practice to make this adjustment before
adjusting the input gain. Press and hold the AUDIO
button while selecting the desired roll-off frequency
with the UP and DOWN arrows.
• LF 35 35 Hz
• LF 50 50 Hz
• LF 70 70 Hz
• LF 100 100 Hz
• LF 120 120 Hz
• LF 150 150 Hz
The roll-off is often adjusted by ear while monitoring
the audio.
Input Gain
Properly set, this adjustment
maximizes the signal to
noise ratio of the system,
and prevents loud peaks from being distorted. The
input gain can be adjusted with the unit in the “standby” mode or while powered up in normal operation.
The control panel Modulation LEDs indicate the audio
level and limiter activity.
This gain adjustment matches the transmitter gain with
the microphone’s output level, the user’s voice level
and the position of the microphone.
It is desirable to to set the gain so that some limiting
occurs on louder peaks. The limiter is very transparent
and its effect is not audible until the system is close to
overload. In other words, don’t be shy about turning
up the gain. You can turn the gain up to maximum and
listen for distortion or compression to get a feel for how
much headroom is available.
Signal Level -20 LED -10 LED
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 db
Note: Different voices will usually require
different gain settings, so check this adjustment
as each new person uses the system. If several
different people will be using the transmitter and
there is not time to make the adjustment for each
individual, adjust it for the loudest voice.
Warning: If the wireless system is connected
to a live sound system, turn the sound system
level down first to avoid severe feedback.
1) Position the microphone in the location where it
will be used in actual operation.
2) Place the transmitter in the “standby” mode or turn
it on for normal use.
3) While speaking or singing into the microphone at
the same voice level that will be used, observe
the LEDs on the control panel. Hold the AUDIO
button and press the UP or DOWN arrow buttons
to adjust the gain until the -20 LED flickers red on
louder peaks. This LED turns red at the instant
full modulation takes place and the very onset of
limiting. The red color does not indicate overload
or clipping.
-20 LED should flicker
red during louder peaks
in the audio
If the unit was set up in “standby” mode, it will be
necessary to turn the transmitter off, then power it up
again in normal operation so the RF output will be on.
Then the other components in the sound or recording
system can be adjusted.
NOTE: Do not use the gain adjustment to control
the volume of the sound system or the recorder
level.
Off Off
Green Off
Red Red
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LECTROSONICS, INC.
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Watertight Transmitter
LectroRM
By New Endian LLC
LectroRM is a mobile application for iOS and Android
operating systems. Its purpose is to remotely control a
variety of Lectrosonics transmitters.
The app remotely changes settings on the transmitter through the use of encoded audio tones, which
when received by the attached microphone, will alter
the configured setting. The app was released by New
Endian, LLC in September 2011. The app is available
for download and sells for about $20 US on the Apple
App Store and Google Play Store.
LectroRM’s remote control mechanism is the use of an
audio sequence of tones (dweedles) that are interpreted by the transmitter as a configuration change. The
settings available in LectroRM are:
• Audio Level (input gain)
• Frequency
• Sleep Mode
• Lock Mode
• RF output power
• Low frequency roll-off
• LEDs ON/OFF
User Interface
The user interface is different between the iOS and
Android versions, although the available settings are
essentially the same.
iOS
Android
The Android version keeps all settings on the same
page and allows the user to navigate between the
activation buttons for each setting. The activation
button must be long pressed to activate. The Android
version also allows users to keep a configurable list of
full sets of settings.
Activation
For a transmitter to respond to remote control audio
tones, the transmitter must meet certain requirements:
• The transmitter must be turned on in either
standby or operating mode.
• The WM transmitter must have firmware version
2.4 or later for all settings to be available.
• The transmitter microphone must be within range.
• The transmitter must be configured to enable
remote control activation.
Please be aware this app is not a
Lectrosonics product. It is privately
owned and operated by New Endian LLC,
www.newendian.com.
The iOS version keeps each available setting on a
separate page with the list of options for that setting.
The “Activate” toggle switch must be enabled to show
the button which will then generate the “dweedle” tone.
The iOS version’s default orientation is upside-down
but can be configured to orient right-side up. The
purpose for this is to orient the device’s speaker, which
is at the bottom of the device, closer to the transmitter
microphone.
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Troubleshooting
Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that
you follow these steps in the sequence listed.
SYMPTOM POSSIBLE CAUSE
TRANSMITTER PWR LED OFF 1) Battery is inserted backwards or dead.
2) Transmitter not powered up. (See Operating Instructions,
Power UP and Boot Sequence.)
TRANSMITTER PWR LED BLINKS GREEN EVERY FEW SECONDS, TRANSMITTER
DOES NOT RESPOND OTHERWISE 1) Transmitter has been put to sleep by the remote control.
Either use the remote control to wake it up again or remove
and reinsert the transmitter battery.
AUDIO LEVEL LEDs NOT LIGHTING 1) Gain control set to minimum.
2) Wrong input type selected (such as Line instead of PH 4)
3) Batteries are dead or installed backwards. Check PWR LED.
4) Mic capsule is damaged or malfunctioning.
5) Mic cable damaged or mis-wired.
RECEIVER RF INDICATOR OFF 1) Transmitter not turned on, or is in Standby mode.
2) Transmitter battery is dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency or block.
Check switches/display on transmitter and receiver.
5) Operating range is too great.
6) Defective transmitter antenna.
NO SOUND (OR LOW SOUND LEVEL), RECEIVER INDICATES PROPER AUDIO MODULATION
1) Receiver output level set too low.
2) Receiver output disconnected, or cable defective or mis-wired.
3) Sound system or recorder input is turned down.
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check audio level
LEDs and receiver audio levels during use.
2) Receiver output may be mismatched with the sound system or
recorder input. Adjust output level on receiver to the correct level
for the recorder, mixer or sound system. (Use the receiver’s Tone
function to check level.)
3) Transmitter is not set to same frequency as receiver. Check that
operating frequency on receiver and transmitter match.
4) Receiver/Transmitter Compatibility mode mismatched.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level.
2) Talent standing too close to speaker system.
3) Mic is too far from user’s mouth.
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LECTROSONICS, INC.
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Watertight Transmitter
SYMPTOM POSSIBLE CAUSE
HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.
2) Receiver antenna missing or obstructed.
3) Transmitter antenna broken or missing.
4) Operating range too great.
5) Signal interference. Turn off transmitter. If receiver’s signal
strength indicator does not drop to nearly zero, this indicates an
interfering signal may be the problem. Try a different operating
frequency.
“Loc” APPEARS IN DISPLAY WHEN ANY BUTTON IS PRESSED
1) Control Panel is locked.
(See Operating Instructions, Lock/Unlock the Keypad)
“Hold” APPEARS IN DISPLAY WHEN ARROW BUTTONS ARE PRESSED
1) Reminder that it is necessary to hold down the AUDIO or
FREQ button to make adjustments to the audio gain or
frequency settings.
“PLL” APPEARS IN DISPLAY 1) Indication that the PLL is not locked. This is a serious condition
that requires factory repair. It may be possible to operate on
another frequency far removed from the one that was selected
when the condition was indicated.
TRANSMITTER WON’T RESPOND TO REMOTE CONTROL
1) If LCD blinks “rc oFF”, transmitter has not been configured
to respond to the remote control.
See Down Arrow Settings and LectroRM.
2) If LCD blinks “- - - - - -”, transmitter is already set as
requested by the remote control.
3) If transmitter does not respond at all, try moving the
remote control closer to the microphone or increasing the
remote control’s loudness setting.
4) Make sure transmitter is not in Sleep mode.
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Accessories and
Replacement Parts
Spring Loaded Belt Clip
Model WMBCSL spring loaded belt clip. Includes hardware kit shown below.
Wire Belt Clip
Model WMBCWIRE includes hardware kit shown
below.
WPMC-10
Watertight connector kit,10 piece, to terminate lavaliere microphones for use with the WM transmitter.
Replacement O-rings
Model ORINGKIT/WM Includes replacement O-rings
for battery caps and microphone plug with WM style
connector, and petroleum jelly pouch.
Belt Clip Hardware Kit
Included with SL and WIRE type belt clips. Provides
mounting of belt clips with either set screws using allen
wrench, or thumb screws.
WPMC-3
Watertight connector kit, 3 piece, to terminate lavaliere
microphones for use with the WM transmitter.
Separate parts:
P/N 35877 O-ring; .433” ID x .623” OD
P/N 35750 O-ring; .312” ID x .437” OD
P/N 32408 petroleum jelly pouch; 5 grams
Replacement battery caps
Model WMDESIKIT includes replacement battery
caps, O-rings, lanyards, thumbscrew and allen wrench.
Includes moisture absorbing
desiccant beads inside caps
See page 18 for details.
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LECTROSONICS, INC.
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Straight Whip Antennas
Whip Length
This is a full size cutting template used to cut the
length of the whip for a particular frequency. Lay the
uncut antenna on top of this drawing and trim the whip
length to the desired frequency.
After cutting the antenna to the desired length, mark
the antenna by installing a color cap or sleeve to indicate the color listed in the table below
Note: Check the scale of your printout - his line should be 6.00 inches long (152.4 mm)
944
Watertight Transmitter
The supplied caps can be used several different ways:
1) A color cap on the end of the whip
2) A color sleeve next to the connector with a black cap
on the end of the whip (trim the closed end of the
colored cap off with scissors to make a sleeve).
3) A color sleeve and color cap (cut the cap in half with
scissors).
22
23
24
25
26
27
28
29
21
20
19
470
BLOCK FREQUENCY CAP/SLEEVE ANTENNA
RANGE COLOR WHIP LENGTH
470 470.100 - 495.600 Black w/ Label 5.67”
19 486.400 - 511.900 Black w/ Label 5.23”
20 512.000 - 537.500 Black w/ Label 4.98”
21 537.600 - 563.100 Brown w/ Label 4.74”
22 563.200 - 588.700 Red w/ Label 4.48”
23 588.800 - 607.950 Orange w/ Label 4.24”
NOTE:
Not all Lectrosonics products are built on all of the blocks covered in
this table.
Factory supplied antennas precut to length include a label with the
frequency range. Label is not supplied with this kit.
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Preventing Corrosion
Whenever the transmitter has been exposed to moisture or perspiration, follow the instructions below to
minimize the risk of corrosion.
DRY THE UNIT BEFORE REMOVING THE
MICROPHONE CONNECTOR OR BATTERY
CAPS.
If the transmitter has been exposed to salt water,
rinse it with fresh water and then dry the exterior of
the transmitter thoroughly with a clean paper towel or
cloth. Remove all moisture around the battery caps
and microphone cable connector.
After removing the battery caps and microphone connector, wipe off any residual moisture around the battery compartment and microphone jack openings and
on the battery caps and microphone connector.
The O-rings should be coated with Vaseline® or an
equivalent petroleum jelly* before each use to ensure
the seals are watertight.
DO NOT USE ANYTHING OTHER THAN
PURE PETROLEUM JELLY TO LUBRICATE
THE O-RINGS. Silicon-based lubricants will
dissolve the O-rings.
Store the unit with no batteries installed, battery caps
removed and the microphone disconnected to allow
any buildup of humidity and moisture to evaporate.
Also see the section in the back of this manual entitled
Desiccant Battery Caps.
Battery Door Update
Early WM transimitters were supplied with standard
battery door caps. The newer battery caps include a
drying agent in a cavity to help absorb moisture inside
the transmitter. The caps are available in a kit for updating older transmitters.
Kit consists of pre-assembled battery doors
with thumbscrew and hex key (Allen wrench)
Remove old center screw with the supplied hex key
(Allen wrench).
Install new battery caps and tighten the thumb screw
by hand. The thumbscrew is removed to recondition
(dry out) the desiccant beads.
Desiccant Battery Caps
Early WM transmitters were shipped with standard
battery caps. Later engineering developed an updated
battery cap design that contained moisture absorbing
desiccant beads to protect the interior of the transmitter from excess humidity. These caps are available as
a kit to update early WM transmitters, or to replace lost
or damaged caps.
Beads are amber/orange
in color when able to
absorb moisture.
These battery doors on the WM will absorb small
amounts of moisture and humidity from the inside of
the transmitter. You must still be careful to keep moisture out of the WM by opening it only in dry or sheltered areas and by making sure the battery surfaces
are dry before installing them. Always use the WP waterproof mic connector in wet conditions. The desiccant
doors will only remove a few drops of moisture.
Beads are stored
inside the cap to
absorb moisture
through the vent
holes.
Eventually, the desiccant beads absorb enough moisture that they will become ineffective and turn green
or blue instead of the normally dry color of amber/
orange. To recharge the desiccant, it must be heated
to 200 to 400 degrees F for at least an hour, preferably
more. The desiccant, the silicone O-ring seals and the
doors can withstand maximum temperatures up to 400
degrees F (205 degrees C).
The doors can be put into an oven at 200 degrees F
for several hours. As the heat drives out the absorbed
moisture, the desiccant will turn back to its normal
amber/orange color.
Do not put the WM transmitter itself into any
oven or heating device.
After heating, particularly at higher temperatures, the
O-rings will likely need a tiny dab of petroleum jelly
(Vaseline*) to replace the lubricant that may migrate in
the heat.
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LECTROSONICS, INC.
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Watertight Transmitter
Re-conditioning (drying out) the caps and
desiccant beads
An easy way to heat the doors is to use a coffee mug
warmer, which typically costs about $10. The surface
temperature of about 220 degrees (F) will dry the
doors and desiccant, but it will not disturb any light
lubricant (like the Vaseline petroleum provided with
the WM) that is on the O-ring seals.
It is also possible to use the mug warmer to dry out the
doors without removing them from the case as shown
below. Do not place the transmitter on this heated
surface. Lay it to one side as shown.
Replacing the desiccant beads
When the beads remain darker green or blue, they
may not be absorbent any longer and should be replaced. Remove the screw that retains the spring and
vented cover with a small Phillips screwdriver.
While the cap assembly is apart and the beads removed, the parts can be cleaned to remove dust and
corrosion. The best way to clean the parts is with petroleum jelly (Vaseline). Apply the petroleum jelly and
then wipe the parts clean.
The mug warmer used for testing consumed 17 watts,
so it could even be used on a sound cart AC supply
without being a huge drain on the batteries.
The color of the desiccant beads can be observed by
shining a pen light on one edge of the battery cap to
illuminate the desiccant. Ideally, they will be an amber/
orange color at room temperature.
Vented cover
Do not use a silicone based oil or grease as it
will dissolve the O-rings.
Do not expose the desiccant beads to any
cleaning liquids or other materials.
Replace the beads with new, amber colored ones. Fill
the cavity to just below the top of the threaded stem
that holds the cover in place so that the cavity is full,
but the beads are not compressed when the vented
cover is replaced.
The desiccant beads are silica gel grade 52, manufactured by a US Company named ADCOA under part
number SG52002. Large containers can be purchased
from ADCOA, and small quantities are available from
Lectrosonics. Contact Lectrosonics for details.
*Vaseline is a registered trademark of Conopco, Inc.
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z1
+6
Specifications
Operating frequencies:
Block 470 470.100 - 495.675
Block 19 486.400 - 511.975
Block 20 512.000 - 537.575
Block 21 537.600 - 563.175
Block 22 563.200 - 588.775
Block 23a 588.800 - 607.950
Channel Spacing: 25 kHz or 100 kHz
Frequency selection: Control panel mounted membrane switches
RF Power output: Switchable; 50, 100 or 250 mW
Compatibility Modes (3) Nu Hybrid, IFB, Mode 3
Pilot tone: 3.5 kHz deviation (Nu Hybrid)
Frequency stability: ± 0.002%
Spurious radiation: Compliant with ETSI EN 300 422-1 v1.4.2
Equivalent input noise: –125 dBV, A-weighted
Input level:
Dynamic mic: 0.5 mV to 50 mV before limiting.
Greater than 1 V with limiting.
Electret lavaliere mic: 1.7 uA to 170 uA before limiting.
Greater than 5000 uA (5 mA) with limiting.
Line level input: 17 mV to 1.7 V before limiting.
Greater than 5 V with limiting.
Input impedance:
Dynamic mic: 300 Ohms
Electret lavaliere: Input is virtual ground with servo adjusted
constant current bias
Line level: > 2.7 k Ohms
Input limiter: Soft limiter, 30 dB range
Bias voltages: Selectable; 2V, 4V and Off
Gain control range: 44 dB; panel mounted membrane switches
Modulation indicators: Dual bicolor LEDs indicate modulation of
–20, -10, 0, +10 dB referenced to full modulation
Controls: Control panel with LCD and four membrane
switches
AA battery compartments are O-ring sealed
Low frequency roll-off: Adjustable from 35 to 150 Hz
Audio Frequency Response: 35 Hz to 20 kHz, +/-1 dB (The low frequency
roll-off is adjustable - see graph above)
Signal to Noise Ratio (dB):
(Note: the dual envelope “soft”
limiter provides exceptionally
good handling of transients
using variable attack and release
time constants. The gradual onset of limiting in the design begins below full modulation,
which reduces the measured figure for SNR without limiting by 4.5 dB)
Total Harmonic Distortion: 0.2% typical (Nu Hybrid mode)
Audio Input Jack: 2.5 mm locking micro; threaded for stainless
sleeve on WP connector
Antenna: Flexible, unbreakable steel cable.
Batteries: 1.5 Volt AA (lithium recommended)
Power Setting: Battery Life:
(HH:MM)
50 mW (2 AA): 13:00
100 mW (2 AA): 10:45
250 mW (2 AA): 5:45
+3
0dB
Mic in 35 Hz
-3
Roll-off
Line in
-6
-9
-12
Mic in 150 Hz
Roll-off
30
100
1kH
20k
0k
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
Weight: 5.33 oz. (151 grams) with lithium batteries
Housing Dimensions: 2.98 x 2.55 x 0.77 inches
75.7 x 64.8 x 19.6 mm
(including battery caps)
Emission Designator: 110KF3E
The recess in the battery compartment
Specifications subject to change without notice.
traps the O-ring for a tight seal.
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Watertight Transmitter
Rio Rancho, NM
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Service and Repair
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting cables and then go through the Troubleshooting section in this manual.
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop
attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once
set at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment.
There are no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it
does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by
phone for out-of-warranty repairs.
Returning Units for Repair
For timely service, please follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need to
know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed
your repair through our receiving and repair departments. The return authorization number must be clearly
shown on the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed”
for safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-
age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Lectrosonics USA:
Mailing address: Shipping address: Telephone:
Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501
PO Box 15900 561 Laser Rd. Ste. 102 (800) 821-1121 Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax
USA USA
Web: E-mail:
www.lectrosonics.com sales@lectrosonics.com
Lectrosonics Canada:
Mailing Address: Telephone: E-mail:
720 Spadina Avenue, (416) 596-2202 Sales: colinb@lectrosonics.com
Suite 600 (877) 753-2876 Toll-free Service: joeb@lectrosonics.com
Toronto, Ontario M5S 2T9 (877-7LECTRO)
(416) 596-6648 Fax
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LECTROSONICS, INC.
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m
LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.co
19 October 2018
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