Lectrosonics SMWB Datasheet

SMWB Series

Miniature Wideband Transmitters

• Selectable output power to maximize

• Ultra-lightweight, corrosion resistant

• Water resistant seals for use in damp

• LCD interface with lockout option

• Programmable compatibility modes

• Servo Bias input circuitry

• IR (infrared) port for fast setup

• Covers 3 standard frequency blocks

SMWB

SMDWB

• Update firmware in the field via Micro

• Alternate use as recorder on internal

TECHNICAL DATA

battery life or operating range

housing

environments

for use with a wide variety of different
receivers

SD card reader

microSDHC memory card

To meet the demand for both extended operating range
and extended battery life, the “WB” series SM transmit­ters offer selectable output power of 25, 50 and 100 mW.
With higher power output, the operating range is im­proved at the expense of battery life. When range is not
an issue, a lower power level can be used to extend the
battery life.

The transmitters offer hands free setup and adjust­ment using audible tones. They can be put to sleep to
conserve battery power during setup while buried inside
costuming, then awakened for normal operation when
the production begins. Other features include input gain
adjustment in 1 dB increments over a 44 dB range and
adjustable low frequency audio roll-off for 3 dB down
points at 35, 50, 70, 100, 120 or 150 Hz to control sub­sonic and very low frequency audio content.

The DSP-based design works with all Digital Hybrid
receivers, and is backward compatible for use with Lec­trosonics 200 and 100 Series, IFB receivers and some
analog receivers from other manufacturers in addition to
its native Digital Hybrid Wireless® operating mode.

The input section features the unique Lectrosonics servo
bias input circuitry with a standard TA5M type jack for
use with electret lavaliere mics, dynamic mics, or line
level signals. 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 of brief
transients and longer duration peaks.

A water resistant control panel with LCD, membrane
switches and multi-color LEDs make input gain adjust­ments, frequency and compatibility mode selection quick
and accurate. The battery compartment accepts lithium
AA batteries.

The housing is machined from solid aluminum blocks to
provide an extremely lightweight and rugged package. A
special non-corrosive finish resists salt water exposure
and perspiration in extreme environments.

Alternate Recording Function

Instead of transmitting, the transmitters may also be
used as a stand alone recorder. The industry standard
.wav (BWF) file format is compatible with essentially any
audio or video editing software.

NOTE: The transmitting and recording functions cannot be
done simultaneously. Users must choose to transmit or record.

Rio Rancho, NM, USA
www.lectrosonics.com

Frequency Tuning Range

RF-intense multichannel and mobile venues must have
a broad selection of frequencies available to alleviate
interference problems, especially with the emergence
of DTV telecasts. 3072 frequencies are selectable in 25
or 100 kHz steps across the broad tuning range of each
frequency band.

Specifications

Transmitter

Operating frequencies:

Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375 (608.000 to 614.000 excluded)
Band C1: 614.400 - 691.175*

*Not available in USA and Canada

NOTE: It’s the user’s responsibility to select the approved
frequencies for region where the transmitter is operating

Channel Spacing: Selectable; 25 or 100 kHz
RF Power output: Switchable; 25, 50 or 100 mW
Compatibility Modes: Digital Hybrid Wireless® (NU Hbr),

200 Series, 100 Series, Mode 3, Mode 6, IFB

Pilot tone (Digital Hybrid Mode): 25 to 32 kHz; 5 kHz deviation
Frequency stability: ± 0.002%
Deviation: ± 75 kHz max. (Digital Hybrid Mode)
Spurious radiation: Compliant with ETSI EN 300 422-1
Equivalent input noise: –125 dBV, A-weighted

Input level:

If set for dynamic mic: 0.5 mV to 50 mV before limiting
Greater than 1 V with limiting

If set for 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 50 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: Fixed 5 V at up to 5 mA

Selectable 2 V or 4 V servo bias for any electret
lavaliere

Gain control range: 44 dB; panel mounted membrane switches
Modulation indicators: Dual bicolor LEDs indicate modulation

–20, -10, 0, +10 dB referenced to full modulation

Controls: Control panel w/ LCD and 4 membrane switches
Low frequency roll-off: Adjustable from 35 to 150 Hz
Audio Frequency Response: 35 Hz to 20 kHz, +/-1 dB

Signal to Noise Ratio (dB):
(overall system, 400 Series mode)

(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

The battery door rotates
to open and close on the
transmitters. A knurled
knob is tightened to
maintain pressure on the
battery contacts.

Total Harmonic Distortion: 0.2% typical (400 Series mode)
Audio Input Jack: Switchcraft 5-pin locking (TA5F)
Antenna: Flexible, unbreakable steel cable.

Battery: AA lithium, disposable
Battery Life w/ Lithium AA:

SMWB 50 mW (1 AA): 5.8 hrs

SMWB 100 mW (1 AA): .4hrs

SMDWB 50 mW (2 AA): 11.6 hrs

SMDWB 100 mW (2 AA): 11.2 hrs

Weight (w/ litium batteries): SMWB: 3.2 oz. (90.72 grams)
SMDWB: 4.0 oz. (113.40 grams)

Overall Dimensions: SMWB: 2.366 x 1.954 x 0.642 inches;
(without microphone) 60.096 x 49.632 x 16.307 mm
SMDWB: 2.366 x 2.475 x 0.642 inches;

60.096 x 62.865 x 16.307 mm
Emission Designator: 180KF3E

Recorder

Storage media: microSDHC memory card
File format: .wav files (BWF)
A/D converter: 24-bit
Sampling rate: 44.1 kHz
Recording modes/Bit rate:

• HD mono mode: 24 bit - 144 kbytes/s
32 bit - 192 kbytes/s

• Split gain mode: 24 bit - 288 kbytes/s
32 bit - 384 kbytes/s

Input
Type: Analog mic/line level compatible;

servo bias preamp for 2V and 4V lavaliere
microphones

Input level: • Dynamic mic: 0.5 mV to 50 mV

• Electret mic: Nominal 2 mV to 300 mV

• Line level: 17 mV to 1.7 V
Input connector: TA5M 5-pin male
Audio Performance
Frequency response: 20 Hz to 20 kHz; +0.5/-1.5 dB
Dynamic range: 110 dB (A), before limiting
Distortion: < 0.035%
Operating temperature range
Celsius: -20 to 50

Fahrenheit: -5 to 122

Specifications subject to change without notice.

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
[phone] • fax [phone] • [phone] US and Canada • [e-mail]

3 May 2018