WM
Digital Hybrid Wireless®
Watertight Belt-Pack Transmitter
WM, WM/E01, WM/E02, WM/X
• Selectable output power (50, 100, 250 mW) to
maximize battery life or operating range
• Machined aluminum, corrosion resistant housing
• Water resistant seals for use in wet environments
• LCD interface with lockout option
• Programmable compatibility modes for use with a
wide variety of different receivers (varies with model;
see Specifications)
• Servo Bias input circuitry with selectable voltage
To meet the demand for both extended operating range
and extended battery life, the transmitter offers selectable output power of 50, 100 and 250 mW. With higher
power output, the operating range is improved at the
expense of battery life. When range is not an issue, the
power can be reduced to extend the battery life.
The transmitter can be controlled by the LectroRM
app for hands free setup and adjustment using audible
tones delivered into the microphone from your phone.
The transmitter can be put to sleep to conserve battery
power during setup when it is buried deep inside costuming, then awakened for normal operation when the
production begins. Other adjustments include frequency,
audio level and control panel lockout.
Designed for wet or dusty environments, the WM transmitter features O-ring sealed battery compartments and
input jack, a compression sealed antenna port, and gasket sealed control panel and back cover. Dual AA batteries provide twice the operating time of earlier watertight
transmitter designs. Larger membrane switches and
control panel and a highly visible, backlit LCD enhance
the user interface.
Digital Hybrid Wireless® is a revolutionary new design
that combines digital audio with an analog FM radio link to
provide outstanding audio quality and the exemplary RF
performance of the finest analog wireless systems.
This overcomes 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.
Instead, it is a technique which can be accomplished only
in the digital domain.
The process eliminates compandor artifacts, expanding the
applications to include test and measurement of acoustic
spaces and musical instruments.
*US Patent 7,225,135
The DSP-based design works with all Digital Hybrid receivers, and is backward compatible for use with Lectrosonics Mode 3 and IFB.
The input section features servo bias circuitry with
voltages being selectable from the LCD to match the
requirements of a wide variety of lavaliere microphones.
The bias can also be turned off for use with dynamic
microphones. A line level setting is provided for use with
signal levels up to 5 volts. The low frequency roll-off can
be adjusted from 35 to 150 Hz.
A DSP-controlled analog audio limiter is employed ahead
of the first mic preamp to protect the entire audio chain
from overload. The limiter has a range of more than 30
dB for excellent overload protection and a dual release
envelope that makes the limiter acoustically transparent
while maintaining low distortion.
TECHNICAL DATA
Rio Rancho, NM, USA
www.lectrosonics.com
Watertight Connections
The input connector is mounted in a recessed opening which provides a captive seat for the O-ring on the
microphone connector. This captures the O-ring allowing
it to be tightened firmly.
The antenna is mounted with a compressible strain
relief under a flange that presses the strain relief into a
tapered opening for a watertight connection.
Input Limiter
A DSP-controlled analog audio limiter is employed
before the analog-to-digital 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. The
limiter recovers quickly from brief transients, so that its
action is hidden from the listener, but recovers slowly
WM Transmitter Block Diagram
from sustained high levels, to keep audio distortion low
and preserve short term dynamic changes.
The bicolor LEDs on the control panel accurately indicate limiter activity to assist in setting the input gain for
optimal signal to noise ratio and dynamic range.
DSP-Based Pilot Tone & Compatibility
The DSP generated pilot tone eliminates the need for
fragile crystals and allows a different pilot tone frequency
for each of the carrier frequencies in the tuning range of
the wireless system. Individual pilot tones significantly
reduce squelch problems in multichannel systems where
a pilot tone signal can appear in the wrong receiver via
intermodulation products.
The DSP also offers compatibility modes to allow backward compatibility with all Lectrosonics Mode 3 and IFB
systems, in addition to its Nu Hybrid operating mode.
Output Isolator
The transmitter RF output circuit includes a specialized
RF device called an isolator using a magnetically polarized ferrite to allow RF signals to pass through to the
antenna, but block them from coming backward into the
transmitter output section.
The isolator greatly reduces RF intermodulation produced
in the transmitter output stages when multiple units are
used in close proximity (a few feet apart). The isolator also
helps protect the output stage from electrostatic shock
delivered to the antenna. Isolators are common in broadcast and commercial applications, but because of their
high cost it is unusual to find them in wireless microphone
transmitters.
LectroRM
By New Endian LLC
LectroRM is a mobile application for iOS and Android operating systems. Its purpose is to remotely control Lectrosonics Transmitters, including:
• SM Series
• WM
• L Series
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 $25 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
• Frequency
• Sleep Mode
• Lock Mode
Activation
For a transmitter to respond to remote control audio
tones, the transmitter must meet certain requirements:
• The transmitter must not be turned off; it can
however be in sleep mode.
• The transmitter must have firmware version
1.5 or later for Audio, Frequency, Sleep and
Lock changes.
• 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.
User Interface
The user interface involves selecting the audio sequence related to the desired change. Each version has
an interface for selecting the desired setting and the
desired option for that setting. Each version also has a
mechanism to prevent accidental activation of the tone.
iOS
The iPhone version keeps each available setting on a
separate page with the list of options for that setting.
On iOS, the “Activate” toggle switch must be enabled to
show the button which will then activate the audio. 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.
Android
The Android version keeps all settings on the same
page and allows the user to toggle 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.
m
Specifications
z1
+6
Operating frequencies:
WM: Block 470 470.100 - 495.600 Block 21 537.600 - 563.100
Block 19 486.400 - 511.900 Block 22 563.200 - 588.700
Block 20 512.000 - 537.500 Block 23 588.800 - 614.300
WM/E01: Block 470 470.100 - 495.600 Block 23 588.800 - 614.300
Block 19 486.400 - 511.900 Block 606 606.000 - 631.500
Block 20 512.000 - 537.500 Block 24 614.400 - 639.900
Block 21 537.600 - 563.100 Block 25 640.000 - 665.500
Block 22 563.200 - 588.700 Block 26 665.600 - 691.100
WM/E02*: Block 470 470.100 - 495.600 Block 25 640.000 - 665.500
Block 19 486.400 - 511.900 Block 26 665.600 - 691.100
Block 20 512.000 - 537.500 Block 27 691.200 - 716.700
Block 21 537.600 - 563.100 Block 28: 716.800 - 742.300
Block 22 563.200 - 588.700 Block 29: 742.400 - 767.900
Block 23 588.800 - 614.300 Block 30: 768.000 - 793.500
Block 606 606.000 - 631.500 Block 31: 793.600 - 819.100
Block 24 614.400 - 639.900 Block 32: 819.200 - 844.700
Block 33: 844.800 - 861.900
* Frequency usage varies by country.
WM/X: Block 470 470.100 - 495.600 Block 23 588.800 - 614.300
Block 19 486.400 - 511.900 Block 606 606.000 - 631.500
Block 20 512.000 - 537.500 Block 24 614.400 - 639.900
Block 21 537.600 - 563.100 Block 25 640.000 - 665.500
Block 22 563.200 - 588.700 Block 26 665.600 - 691.100
NOTE: It’s the user’s responsibility to select the
approved frequencies for the region where the
transmitter is operating
Channel Spacing: WM: 25 kHz or 100 kHz
WM/E01: 100 kHz
WM/E02: 100 kHz
WM/X: 25 kHz or 100 kHz
Frequency selection: Control panel mounted membrane switches
RF Power output: WM: Switchable; 50, 100 or 250 mW
WM/E01: Switchable; 50, 100 or 250 mW
WM/E02: 10 mW
WM/X: Switchable; 50, 100 or 250 mW
Compatibility Modes WM: Nu Hybrid, IFB, Mode 3
WM/E01: Digital Hybrid Wireless® and IFB
WM/E02: Digital Hybrid Wireless® and IFB
WM/X: Nu Hybrid, Digital Hybrid Wireless®,
IFB, Mode 3, Mode 4, Mode 6
Pilot tone: 3.5 kHz deviation (Nu Hybrid)
25 to 32 kHz; 3 kHz deviation
(Digital Hybrid Mode)
Frequency stability: ± 0.002%
Spurious radiation: WM: Compliant with ETSI EN 300 422-1 v1.4.2
WM/E01/E02/E0X: 60 dB below carrier
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
Low frequency roll-off: Adjustable from 35 to 150 Hz
+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
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)
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
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
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: WM: 110KF3E
WM/E01: 180KF3E
Specifications subject to change without notice.
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
18 November 2019
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