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.
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 system simply
encodes the signal to use a noisy channel as efficiently
®
2
LECTROSONICS, INC.
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.
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.
Digital Hybrid Wireless Belt-Pack Transmitters
Compatibility with
microSDHC memory cards
Please note that the SMWB and SMDWB are designed
for use with microSDHC memory cards. There are
several types of SD card standards (as of this writing)
based on capacity (storage in GB).
SDSC: standard capacity, up to and including 2 GB –
DO NOT USE!
SDHC: high capacity, more than 2 GB and up to and
including 32 GB – USE THIS TYPE.
SDXC: extended capacity, more than 32 GB and up to
and including 2 TB – DO NOT USE!
SDUC: extended capacity, more than 2TB and up to
and including 128 TB – DO NOT USE!
The larger XC and UC cards use a different formatting
method and bus structure and are NOT compatible with
the recorder. These are typically used with later generation video systems and cameras for image applications
(video and high resolution, high speed photography).
ONLY microSDHC memory cards should be used. They
are available in capacities from 4GB to 32GB. Look for
the Speed Class 10 cards (as indicated by a C wrapped
around the number 10), or the UHS Speed Class I
cards (as indicated by the numeral 1 inside a U symbol). Also note the microSDHC Logo.
If you are switching to a new brand or source of card,
we always suggest testing first before using the card on
a critical application.
The following markings will appear on compatible
memory cards. One or all of the markings will appear on
the card housing and the packaging.
Speed Class 10
UHS Speed Class 1
UHS Speed Class I
Stand-alone
Rio Rancho, NM
UHS Speed Class I
Accompanying
microSDHC logo
microSDHC Logo is a trademark of SD-3C, LLC
3
SMWB Series
Features
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
IR (Infrared) Port
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.
IR (Infrared) Port
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.
IR (infrared) Sync
The IR port is for quick setup using a receiver with this
function available. IR Sync will transfer the settings for
frequency, step size and compatibility mode from the
receiver to the transmitter. This process is initiated by
the receiver. When the sync function is chosen on the
receiver, hold the IR port of the transmitter near the IR
port of the receiver. (There is no menu item available on
the transmitter to initiate the sync.)
NOTE: If a mismatch exists between the receiver
and transmitter, an error message will appear on
the transmitter LCD stating what the problem is.
4
LECTROSONICS, INC.
Digital Hybrid Wireless Belt-Pack Transmitters
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.
Formatting SD Card
New microSDHC memory cards come pre-formatted
with a FAT32 file system which is optimized for good
performance. The PDR relies on this performance and
will never disturb the underlying low level formatting
of the SD card. When the SMWB/SMDWB “formats”
a card, it performs a function similar to the Windows
“Quick Format” which deletes all files and prepares
the card for recording. The card can be read by any
standard computer but if any write, edit or deletions
are made to the card by the computer, the card must
be re-formatted with the SMWB/SMDWB to prepare it
again for recording. The SMWB/SMDWB never low level
formats a card and we strongly advise against doing so
with the computer.
To format the card with the SMWB/SMDWB, select
Format Card in the menu and press MENU/SEL on the
keypad.
WARNING: Do not perform a low level format (complete format) with a computer. Doing so may render
the memory card unusable with the SMWB/SMDWB
recorder.
With a windows based computer, be sure to check the
quick format box before formatting the card.
With a Mac, choose MS-DOS (FAT).
IMPORTANT
The formatting of the SD card sets up contiguous sectors for maximum efficiency in the recording process.
The file format utilizes the BEXT (Broadcast Extension)
wave format which has sufficient data space in the
header for the file information and the time code imprint.
The SD card, as formatted by the SMWB/SMDWB recorder, can be corrupted by any attempt to directly edit,
change, format or view the files on a computer.
The simplest way to prevent data corruption is to copy
the .wav files from the card to a computer or other Windows or OS formatted media FIRST. Repeat – COPY
THE FILES FIRST!
Do not rename files directly on the SD card.
Do not attempt to edit the files directly on the SD card.
Do not save ANYTHING to the SD card with a comput-
er (such as the take log, note files etc) - it is formatted
for SMWB/SMDWB recorder use only.
Do not open the files on the SD card with any third
party program such as Wave Agent or Audacity and
permit a save. In Wave Agent, do not IMPORT - you
can OPEN and play it but do not save or Import - Wave
Agent will corrupt the file.
In short - there should be NO manipulation of the data
on the card or addition of data to the card with anything
other than an SMWB/SMDWB recorder. Copy the files
to a computer, thumb drive, hard drive, etc. that has
been formatted as a regular OS device FIRST - then
you can edit freely.
iXML HEADER SUPPORT
Recordings contain industry standard iXML chunks in
the file headers, with the most commonly used fields
filled in.
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.
Rf On?
No
Ye s
RF indicator not blinking
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
• Blk606? - enables Block 606 legacy mode for use
with Block 606 receivers.
• 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
NOTE: The Blk606? feature is only available on
Bands B1 or C1.
Hold
for
Rf On
Hold power
button until
the counter
reaches 3
b 19
A
E
503.800
...3
-40
-20
0
If the button is released before the countdown is completed, the unit will power up with the RF output turned
off.
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
From the Main Window press MENU/SEL.
SMWB Main Menu
Use the UP/Down arrow keys to select the item.
BACK
BACK
BACK
BACK
BACK
BACK
BACK
BACK
Files
Format?
(erases)
RECORD-
Gain
Freq
Rolloff
70 Hz
Compat
Nu Hybrid
StepSiz
Files
Format
Record
Gain
Freq.
Rolloff
Compat
StepSiz
SEL
SEL
SEL
SEL
SEL
SEL
SEL
SEL
ING
22
0014A000
0013A000
OR
Stop
Select from
listing
b 21
80
550.400
Select from
listing
Select from
listing
No
Yes
100 kHz
25 kHz
SEL
BACK
Select from
listing
Use arrow keys to initiate
formatting the memory card
SAVED
Use arrow keys to
select input gain
Press SEL to
select desired
adjustment
Use arrow keys to
select input gain
Use arrow keys to select
compatibility mode
Use arrow keys to select
frequency step size
Use arrow keys to
select file in list
Use arrow keys
to select desired
frequency
BACK
BACK
BACK
BACK
BACK
BACK
BACK
Phase
TxPower
Sc&Take
Takes
Naming
[SMWB ]
E.........................F
0/ 14G
Max Rec
Default
settings
Pos.
Neg.
25mW
50 mW
100 mW
Scene 5
Take 3
S05 T004
S05 T005
S05 T006
Seq #
Clock
Press SEL to
select desired
adjustment
Use arrow keys to select
audio output polarity
Use arrow keys to select
RF power output
Use arrow keys to select
file naming method
Battery remaining
Storage used
Storage capacity
Available recording time (H : M : S)
No
Yes
Use arrow keys to return recorder
to default factory settings
Use arrow keys to
advance scene & take
Use arrow keys to select
scene & take
LECTROSONICS, INC.
Phase
TxPower
Sc&Take
Takes
Naming
SD Info
Default
SEL
SEL
SEL
SEL
SEL
SEL
SEL
8
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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