Lectrosonics SMDWBA1A User Manual
INSTRUCTION MANUAL
SMWB Series
Wireless Microphone Transmitters and Recorders
Fill in for your records:
Serial Number:
SMWB
SMDWB
Featuring
Digital Hybrid Wireless
Technology
US Patent 7,225,135
®
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
SMWB Series
2
LECTROSONICS, INC.
Digital Hybrid Wireless Belt-Pack Transmitters
Table of Contents
Introduction .............................................................................................................................................................................................4
About Digital Hybrid Wireless
Servo Bias Input and Wiring .................................................................................................................................................................4
DSP-controlled Input Limiter .................................................................................................................................................................4
Recorder function ..................................................................................................................................................................................4
Features ...................................................................................................................................................................................................5
Battery Status LED Indicator ................................................................................................................................................................5
Battery Installation .................................................................................................................................................................................5
Turning Power ON ..................................................................................................................................................................................6
Short Button Press ................................................................................................................................................................................6
Long Button Press ................................................................................................................................................................................6
Menu Shortcuts ..................................................................................................................................................................................... 6
Transmitter Operating Instructions ......................................................................................................................................................7
Recorder Operating Instructions ..........................................................................................................................................................7
SMWB Main Menu ...................................................................................................................................................................................8
SMWB Power Button Menu ....................................................................................................................................................................9
Setup Screen Details ...........................................................................................................................................................................10
Locking/Unlocking Changes to Settings..............................................................................................................................................10
Main Window Indicators ...................................................................................................................................................................... 10
Connecting the Signal Source ............................................................................................................................................................10
Turning Control Panel LEDs ON/OFF .................................................................................................................................................10
Helpful Features on Receivers ............................................................................................................................................................10
Files ....................................................................................................................................................................................................10
Record or Stop ...................................................................................................................................................................................11
Adjusting the Input Gain ......................................................................................................................................................................11
Selecting Frequency ...........................................................................................................................................................................11
Selecting Frequency Using Two Buttons ............................................................................................................................................. 12
About Overlapping Frequency Bands .................................................................................................................................................12
Selecting the Low Frequency Roll-off .................................................................................................................................................12
Selecting the Compatibility (Compat) Mode ........................................................................................................................................12
Selecting Step Size .............................................................................................................................................................................13
Selecting Audio Polarity (Phase) ......................................................................................................................................................... 13
Setting Transmitter Output Power .......................................................................................................................................................13
Recorded File Naming .......................................................................................................................................................................13
SD Info ................................................................................................................................................................................................13
Restoring Default Settings ..................................................................................................................................................................13
5-Pin Input Jack Wiring ........................................................................................................................................................................14
Microphone Cable Terminationfor Non-Lectrosonics Microphones ................................................................................................15
Input Jack Wiring for Different Sources .............................................................................................................................................16
Microphone RF Bypassing ..................................................................................................................................................................17
Line Level Signals ...............................................................................................................................................................................17
Firmware Update ..................................................................................................................................................................................18
Silver Paste on SM Series Transmitter Thumbscrews .......................................................................................................................20
Straight Whip Antennas .......................................................................................................................................................................21
Belt Clips and Pouches ........................................................................................................................................................................22
SMWB Single Battery Model ..............................................................................................................................................................22
SMDWB Dual Battery Model ...............................................................................................................................................................22
Miscellaneous Accessories .................................................................................................................................................................23
LectroRM ...............................................................................................................................................................................................24
Troubleshooting ....................................................................................................................................................................................25
Specifications .......................................................................................................................................................................................26
Service and Repair ...............................................................................................................................................................................27
Returning Units for Repair ..................................................................................................................................................................27
® .................................................................................................................................................................................................................................................................................4
Rio Rancho, NM
3
SMWB Series
Introduction
The design of the SMWB transmitter delivers the advanced technology and features of Digital Hybrid Wireless® in a Lectrosonics belt-pack transmitter at a modest
cost. Digital Hybrid Wireless® combines a 24-bit digital
audio chain with an analog FM radio link to eliminate a
compandor and its artifacts, yet preserve the extended
operating range and noise rejection of the finest analog
wireless systems. Along with providing peerless audio
quality with wide frequency response and dynamic
range in Nu Hybrid mode, the technology used in the
SMWB transmitter includes compatibility modes for
Lectrosonics Mode 3 and IFB receivers.
The housing is a rugged, machined aluminum package with a standard Lectrosonics 5-pin input jack for
use with electret lavaliere mics, dynamic mics, musical
instrument pickups and line level signals. The LEDs
on the keypad allow quick and accurate level settings
without having to view the receiver. The unit is powered
by AA batteries, one battery in the SMWB and two in
the SMDWB. The antenna port uses a standard 50 ohm
SMA connector.
Switching power supplies provide constant voltages to
the transmitter circuits from the beginning to the end of
battery life, with output power remaining constant over
the life of the battery. The input amplifier uses an ultra
low noise op amp. Input gain is adjustable over a 44 dB
range, with a DSP-controlled dual envelope input limiter
providing a clean 30 dB range to prevent overload from
signal peaks.
About Digital Hybrid Wireless
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
(known as “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, operating range and resistance to
interference.
The Lectrosonics Digital Hybrid Wireless system 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 but a technique which can be accomplished
only in the digital domain.
Since the RF link between transmitter and receiver is
FM, channel noise will increase gradually with increased operating range and weak signal conditions,
however, the Digital Hybrid Wireles system handles this
situation elegantly with rarely audible audio artifacts as
the receiver approaches its squelch threshold.
®
In contrast, a purely digital system tends to drop the
audio suddenly during brief dropouts and weak signal
conditions. The Digital Hybrid Wireless
encodes the signal to use a noisy channel as efficiently
and robustly as possible, yielding audio performance
that rivals that of purely digital systems, without the
power, noise and bandwidth problems inherent in digital
transmission. Because it uses an analog FM link, Digital
Hybrid Wireless enjoys all the benefits of conventional
FM wireless systems, such as excellent range, efficient
use of RF spectrum, and long battery life.
system simply
Servo Bias Input and Wiring
The input preamp is a unique design that delivers
audible improvements over conventional transmitter
inputs. Two different microphone wiring schemes are
available to simplify and standardize the configuration.
Simplified 2-wire and 3-wire configurations provide several arrangements designed for use only with servo bias
inputs to take full advantage of the preamp circuitry.
A line level input wiring provides an extended frequency
response with an LF roll-off at 35 Hz for use with instruments and line level signal sources.
DSP-controlled Input Limiter
The transmitter employs a digitally-controlled analog
audio limiter prior to the analog-to-digital converter.
The limiter has a range greater than 30 dB for excellent
overload protection. A dual release envelope makes the
limiter acoustically transparent while maintaining low
distortion. It can be thought of as two limiters in series,
connected as a fast attack and release limiter followed
by a slow attack and release limiter. The limiter recovers
quickly from brief transients, so that its action is hidden
from the listener, but recovers slowly from sustained
high levels to keep audio distortion low and preserve
short term dynamic changes in the audio.
Recorder function
The SMWB has a built in recording function for use in
situations where RF may not be possible or to work as
a stand alone recorder. The record function and transmit functions are exclusive of each other - you cannot
record AND transmit at the same time. When the unit is
transmitting and recording is turned on, the audio in the
RF transmission will stop, but the battery status will still
be sent to the receiver.
The recorder samples at 44.1kHz rate with a 24 bit
sample depth. (the rate was selected due to the required 44.1kHz rate used for the digital hybrid algorithm). The micro SDHC card also offers easy firmware
update capabilities without the need for a USB cable or
driver issues.
4
LECTROSONICS, INC.
Digital Hybrid Wireless Belt-Pack Transmitters
Features
Indicates micro
SDHC card present
and recording
status (stopped/not
recording)
Antenna
Port
Modulation
Indicators
microSDHC
memory card
Audio
Input
Jack
port
REC
Battery
-40
-20
0
Status LED
Antenna
Port
microSDHC
memory card
port
Audio
Input
Jack
Battery Status LED Indicator
AA batteries can be used to power the transmitter.
The LED labeled BATT on the keypad glows green
when the batteries are good. The color changes to red
when the battery voltage drops down and stays red
through most of the battery life. When the LED begins
to blink red, there will be only a few minutes remaining.
The exact point at which the LEDs turn red will vary
with battery brand and condition, temperature and
power consumption. The LEDs are intended to simply
catch your attention, not to be an exact indicator of
remaining time.
A weak battery will sometimes cause the LED to glow
green immediately after the transmitter is turned on, but
it will soon discharge to the point where the LED will
turn red or the unit will turn off completely.
Some batteries give little or no warning when they
are depleted. If you wish to use these batteries in the
transmitter, you will need to manually keep track of the
operating time to prevent interruptions caused by dead
batteries.
Start with a fully charged battery, then measure the time
it takes for the Power LED to go out completely.
NOTE: The battery timer feature in many
Lectrosonics receivers is very helpful in measuring
battery runtime. Refer to the receiver instructions
for details on using the timer.
Battery Installation
The transmitter is powered by AA batteries. (The SMWB
requires one AA battery and the SMDWB requires two.)
We recommend using lithium for longest life.
Because some batteries run down quite abruptly, using
the Power LED to verify battery status will not be reliable. However, it is possible to track battery status using
the battery timer function available in Lectrosonics
Digital Hybrid Wireless receivers.
The battery door opens by simply unscrewing the
knurled knob part way until the door will rotate. The
door is also easily removed by unscrewing the knob
completely, which is helpful when cleaning the battery
contacts. The battery contacts can be cleaned with
alcohol and a cotton swab, or a clean pencil eraser. Be
sure not to leave any remnants of the cotton swab or
eraser crumbs inside the compartment.
A small pinpoint dab of silver conductive grease* on the
thumbscrew threads can improve battery performance
and operation. See page 20. Do this if you experience a
drop in battery life or an increase in operating temperature.
If you are unable to locate a supplier of this type of
grease - a local electronics shop for example - contact
the factory for a small maintenance vial.
Insert the batteries according to the markings on the
back of the housing. If the batteries are inserted incorrectly, the door may close but the unit will not operate.
Rio Rancho, NM
5
SMWB Series
Turning Power ON
Short Button Press
When the unit is turned off, a short press of the power
button will turn the unit on in the Standby Mode with
the RF output turned off.
RF indicator blinks
b 19
A
E
494.500
-40
-20
0
To enable RF output from the Standby Mode, press the
Power button, select Rf On? option, then select yes.
Resume
Pwr Off
Rf On?
AutoOn?
Long Button Press
When the unit is turned off, a long press of the power
button will start a countdown to turn the unit on with the
RF output turned on. Continue to hold the button until
the countdown is complete.
Hold
for
Rf On
...3
If the button is released before the countdown is completed, the unit will power up with the RF output turned
off.
Rf On?
No
Ye s
Hold power
button until
the counter
reaches 3
RF indicator not blinking
b 19
A
E
503.800
-40
-20
0
Power Button Menu
When the unit is already turned on, the Power Button is
used to turn the unit off, or to access a setup menu.
A long press of the button turns the power off.
A short press of the button opens a menu for the following setup options. Select the option with the UP and
DOWN arrow buttons then press MENU/SEL.
• Resume returns the unit to the previous screen and
operating mode
• Pwr Off turns the unit off
• Rf On? turns the RF output on or off
• AutoOn? selects whether or not the unit will turn on
automatically after a battery change
• Remote enables or disables the audio remote control (dweedle tones)
• Bat Type selects the type of battery in use
• Backlit sets the duration of the LCD backlight
• Clock sets the Year/Month/Day/Time
• Locked disables the control panel buttons
• LED Off enables/disables control panel LEDs
• About displays the model number and firmware
version
Menu Shortcuts
From the Main/Home Screen, the following shortcuts
are available:
• Record: Press the MENU/SEL + UP arrow simultaneously
• Stop Recording: Press the MENU/SEL + DOWN
arrow simultaneously
NOTE: The shortcuts are only available from the
main/home screen AND when a microSDHC
memory card is installed.
6
LECTROSONICS, INC.
Digital Hybrid Wireless Belt-Pack Transmitters
Transmitter Operating
Instructions
• Install battery(s)
• Turn power on in the Standby mode (see previous
section)
• Connect microphone and place it in the position
where it will be used.
• Have the user talk or sing at the same level that will
be used in the production, and adjust the input gain
so that the -20 LED blinks red on louder peaks.
Gain
Gain
Freq
Rolloff
Compat
Signal Level -20 LED -10 LED
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 dB
• Set the frequency and compatibility mode to match
the receiver.
• Turn the RF output on with the Rf On? item in the
power menu, or by turning the power off and then
back on while holding the power button in and waiting for the counter to reach 3.
-40
-20
Use the UP and DOWN
arrow buttons to adjust
25
the gain until the -20
LED blinks red on
louder peaks
0
Off Off
Green Off
Green Green
Red Green
Red Red
Recorder Operating
Instructions
• Install battery(s)
• Insert microSDHC memory card
• Turn power on
• Format memory card
• Connect microphone and place it in the position
where it will be used.
• Have user talk or sing at the same level that will be
used in the production, and adjust the input gain so
that the -20 LED blinks red on louder peaks
Gain
Gain
Freq.
Rolloff
Compat
Signal Level -20 LED -10 LED
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 dB
• Press MENU/SEL and choose Record from the
menu
-40
-20
Files
For mat
RECORD-
Record
Gain
Use the UP and DOWN
arrow buttons to adjust
25
the gain until the -20
LED blinks red on
louder peaks
0
Off Off
Green Off
Green Green
Red Green
Red Red
b 19
REC
A
E
ING
503.800
-40
-20
0
Rio Rancho, NM
• To stop recording, press MENU/SEL and choose
Stop; the word SAVED appears on the screen
Files
For mat
SAVED
Stop
Gain
To play back the recordings, remove the memory card
and copy the files onto a computer with video or audio
editing software installed.
b 19
A
E
503.800
-40
-20
0
7
SMWB Series
Freq.
Rolloff
Compat
StepSiz
Phase
TxPower
SEL
BACK
Freq
Press SEL to
select desired
adjustment
Use arrow keys
to select desired
frequency
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 select
RF power output
25mW
50 mW
100 mW
TxPower
Rolloff
70 Hz
Use arrow keys to
select input gain
Select from
listing
b 21
80
550.400
Nu Hybrid
From the Main Window press MENU/SEL.
Use the UP/Down arrow keys to select the item.
Files
SEL
BACK
Files
0014A000
0013A000
Use arrow keys to
select file in list
Select from
listing
Format
SEL
BACK
Use arrow keys to initiate
formatting the memory card
No
Yes
Format?
(erases)
Gain
SEL
BACK
Gain
22
Use arrow keys to
select input gain
Select from
listing
Record
SEL
BACK
RECORD-
ING
OR
Stop
SEL
BACK
SAVED
Default
SEL
BACK
Use arrow keys to return recorder
to default factory settings
No
Yes
Default
settings
Naming
SEL
BACK
Use arrow keys to select
file naming method
Seq #
Clock
Naming
SD Info
SEL
BACK
[SMWB ]
Max Rec
E.........................F
0/ 14G
Battery remaining
Storage used
Storage capacity
Available recording time (H : M : S)
SMWB Main Menu
8
LECTROSONICS, INC.
SMWB Power Button Menu
Rf On?
BatType
Remote
Press SEL to return to
the previous screen
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
From the Main Window press the power button.
Use the UP/DOWN arrow keys to select the item.
Resume
Pwr Off
Press SEL to turn the
power off
AutoOn?
SEL
BACK
ProgSw
Use arrow keys to enable
auto power restore
No
Yes
1.5 V
Backlit
SEL
BACK
Backlit
Use arrow keys to select
LCD backlight duration
On
30 sec
5 sec
Off
About
Locked
SEL
BACK
About
SMWB
v1.00
Displays firmware version
SEL
BACK
Use arrow keys to
lock/unlock keypad
Yes
No
Locked?
LED Off
SEL
BACK
LEDs
Use arrow keys to turn
LEDs on or off
On
Off
Clock
SEL
BACK
Clock
2017
07 / 26
17 : 19
Year
Month / Day
Hour : Minute
Digital Hybrid Wireless Belt-Pack Transmitters
Rio Rancho, NM
9
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