Lectrosonics SMV9 User Manual
INSTRUCTION MANUAL
SMV-941 Series
Super Miniature Variable Power Transmitters
With Digital Hybrid Wireless® Technology
US Patent 7,225,135
SMV-941 Single Battery Model
SMQV-941 Dual Battery Model
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Serial Number:
Purchase Date:
Digital Hybrid Wireless
US Patent 7.225.135
Rio Rancho, NM, USA
www.lectrosonics.com
®
SMV Series
Introduction
The SM Series variable power transmitters are the
product of many years of engineering and experience in
professional audio markets. The unique design provides
several distinct features for professional applications:
• Selectable output power to maximize battery life or
operating range as needed
• Superb, compandor-free audio quality
• Ultra-lightweight, corrosion resistant housing
• Water resistant seals for use in damp environments
• Programmable compatibility modes for use with a
wide variety of different receivers
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 SM Series transmitters feature the unique servo
bias input circuitry with a standard TA5M type input jack
for use with electret lavaliere mics, dynamic mics, or
line level signals. 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, without having to
view the receiver. The battery compartment accepts
AA lithium or rechargeable batteries. The housings are
machined from solid aluminum billets to provide an
extremely lightweight and rugged package. A special
non-corrosive finish resists salt water exposure and
perspiration in extreme environments.
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LECTROSONICS, INC.
Table of Contents
Introduction ............................................................................ 2
General Technical Description ............................................. 4
Controls and Functions ........................................................ 6
LCD Screen ......................................................................... 6
Power LED ........................................................................... 6
Power LED Off Feature ........................................................ 6
Audio Input Jack ................................................................... 6
AUDIO and FREQ Buttons ................................................... 6
UP/DOWN Arrow Buttons .................................................... 6
Battery and Battery Eliminator Installation ......................... 7
Attaching and Removing the Microphone ........................... 7
Operating Instructions .......................................................... 8
Power Up and Boot Sequence ............................................. 8
Power Down ......................................................................... 8
Standby Mode ...................................................................... 8
Menus .................................................................................. 8
Locking/Unlocking the Control Panel ................................. 10
Remote Control Operation ................................................. 10
5-Pin Input Jack Wiring ....................................................... 11
Installing the Connector: .................................................... 11
Line Level Signals .............................................................. 11
Microphone Cable Termination
for Non-Lectrosonics Microphones ............................ 12
Microphone RF Bypassing ................................................. 13
Wiring Hookups for Different Sources .............................. 14
Silver Paste on SM Series Transmitter Thumbscrews ...... 15
LectroRM .............................................................................. 16
Accessories for single battery models: ............................. 17
Accessories for dual battery models: ................................ 17
Accessories for Both Models ............................................. 18
Specifications and Features ............................................... 19
Specifications ..................................................................... 19
Troubleshooting ................................................................... 20
Service and Repair .............................................................. 22
Returning Units for Repair ................................................. 22
Super-Minature Belt Pack Transmitter
Rio Rancho, NM
For body worn operation, this transmitter models has
been tested and meets the FCC RF exposure guidelines
when used with the Lectrosonics accessories supplied or
designated for this product. Use of other accessories may
not ensure compliance with FCC RF exposure guidelines.
Contact Lectrosonics if you have any questions or need more
information about RF exposure using this product..
This device complies with FCC radiation exposure limits as
set forth for an uncontrolled environment. This device should
be installed and operated so that its antenna(s) are not colocated or operating in conjunction with any other antenna or
transmitter.
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SMV Series
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 level sound systems, 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.
+5V
5V
Regulator
4
+6V
Variable 1.8 - 4v
LECTROSONICS, INC.
Super-Minature Belt Pack 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 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
SM transmitters are designed to operate with Lectrosonics Digital Hybrid receivers and will yield the best performance when doing so, however, due to the flexibility
of digital signal processing, the transmitter can also
operate with Lectrosonics IFB receivers in the same
frequency band.
Battery Options and Operating Time
Switching power supplies convert regulated battery voltages to operate various circuit stages with maximum
efficiency.
The firmware “remembers” the power status when a
battery fails, so the transmitter will be turned on automatically when the battery is replaced and the previous
settings will be enabled.
Circulator/Isolator
The RF output circuit includes a one way circulator/isolator using a magnetically polarized ferrite. This device
greatly reduces RF intermodulation 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.
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.
Variable Power Output
This advanced feature allows the operator to optimize
the transmitter for maximum battery life, or for slightly
increased 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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SMV Series
2468
Hours
Voltage
Varies
Controls and Functions
Modulation
LEDs
Battery
Compartment
Cover Plate
Battery
Compartment
Thumb Screw
PWR LED
AUDIO Button FREQ Button
LCD Screen
The LCD is a numeric-type Liquid Crystal Display with
screens for adjusting power, frequency, audio level and
low frequency audio roll-off. The transmitter can be
powered up with or without the RF output turned on. A
countdown appears in the LCD when powering on and
off, allowing the transmitter to be turned on without RF
for adjustments, and to prevent accidentally turning it off
with momentary button presses.
Power LED
The PWR LED glows green when the battery is good.
The color changes to red at a midpoint of the runtime
as the battery voltage drops. When the LED begins to
blink red, there is usually less than 30 minutes remaining with a lithium battery.
The exact point at which the LED turns red will vary with
battery brand and condition, temperature, and the output power setting. The LED is intended to simply catch
your attention, not to be an exact indicator of remaining
time. The illustration below depicts typical behavior with
a lithium battery in the single battery model at 50 mW.
Green Red Blink
1.6
1.4
1.2
1.0
.8
A weak battery will sometimes cause the PWR LED to
glow green immediately after the transmitter is turned
on, but will soon discharge to the point where the LED
will turn red or the unit will turn off completely.
Power LED Off Feature
In normal operating mode, the UP and DOWN arrow
buttons may be used to turn the PWR LED indicators off and on. This setting does not persist through a
power cycle nor does it affect the LCD backlight.
LCD
UP Arrow
Antenna
Jack
Audio
Input Jack
DOWN Arrow
Audio Input Jack
The Servo Bias input circuitry accommodates virtually
every lavaliere, handheld or shotgun microphone available, plus line level signals.
Battery Compartment and Thumb Screw
The large knurled thumbscrew is used to release or
secure the Battery Compartment Cover Plate.
Modulation LEDs
Proper input gain adjustment is critical to ensure the
best audio quality. Two bicolor LEDs will glow either red
or green to accurately indicate modulation levels. The
input circuitry includes a wide range DSP controlled
limiter to prevent distortion at high input levels.
It is important to set the gain (audio level) high enough
to achieve full modulation during louder peaks in the
audio. The limiter can handle over 30 dB of level 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. In the table below, +0 dB indicates full
modulation (-20 LED just turns red).
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 and FREQ Buttons
The AUDIO button is used to display the audio level and
low frequency roll-off settings. The UP and DOWN arrow buttons adjust the values.
The FREQ Button displays the selected operating
frequency and toggles the LCD between displaying
the actual operating frequency in MHz and a two-digit
hexadecimal number that corresponds to the equivalent
frequency switch setting on legacy transmitters.
Pressing both buttons simultaneously enters the
standby mode and turns the unit on and off
UP/DOWN Arrow Buttons
The UP and DOWN arrow buttons are used to select
the values on the various setup screens and to lock out
the control panel.
Antenna
The transmitter uses a whip antenna with a flexible woven, galvanized steel mesh cable and a standard SMA
connector.
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LECTROSONICS, INC.
Super-Minature Belt Pack Transmitter
Battery and Battery
Eliminator Installation
Note: Standard zinc-carbon batteries marked
“heavy-duty” or “long-lasting” are not adequate.
The battery status circuitry is designed for the voltage
drop over the life of lithium batteries.
To install new batteries:
1. Turn the battery cover plate thumbscrew counterclockwise a few turns until the door will rotate.
2. Insert the new batteries into the housing. Polarity is
marked on the back of the housing.
3. Align the battery cover plate and tighten the battery
cover plate thumbscrew.
Cover plate
thumbscrew
Gore-Tex® covered vent
Do Not Cover Vent
Attaching and Removing
the Microphone
The flexible sleeve over the 5-pin plug on the microphone helps prevent dust and moisture from getting into
the input jack, and provides additional strain relief. The
flange around the rim of the connector on the transmitter
creates a splash proof connection and keeps the sleeve
securely attached.
The following procedure simplifies the attachment and
removal of the microphone to assure the sleeve is
seated securely.
Align the latch on the plug and jack and insert the
connector. It is easier to attach the microphone when
the sleeve is pulled back as shown in the Step 3 photo
below.
1
If the sleeve is pulled
down and covering the
connector, squeeze the
end of the sleeve so you
can feel the connector
inside and press it into
the jack until it latches.
Two battery
compartments
(SMQV)
Polarity engraved
into housing
To install the battery eliminator, loosen the
thumbscrew completely and remove the battery
door. Insert the battery eliminator and tighten the
thumbscrew.
Install plastic cap
on dual battery
model to cover
the open battery
compartment.
2
3
Pinch and
squeeze the
sleeve on this end
to work it down
over the flange.
Release button
Pinch and squeeze the
sleeve near the flange
and work it down with a
kneading motion over
the flange all the way
around until it stays in
place flush with the
housing. Pull on the
connector to make sure
it is firmly latched.
To remove the connector, pull the sleeve back
to expose the black
release button. Press the
button to unlatch the
plug.
Gore - Tex Registered trademark of W. L. Gore and Associates
Rio Rancho, NM
7
SMV Series
Operating Instructions
Power Up and Boot Sequence
1) Ensure that good batteries are installed in the unit.
2) Simultaneously press and hold the AUDIO and
FREQ buttons until the power on boot sequence is
initiated.
The count will progress from 1
through 3 and the unit will then
power up with the RF output
turned on. During this turn on sequence, the
modulation and power LEDs all glow red, then
green, and then revert to normal operation. If the
buttons are released before the count is complete,
the unit will boot up into the standby mode (see
below).
The LCD displays the following information during
the boot sequence:
Company Name:
Frequency Block and
Firmware Version
(rX.X):
Compatibility Mode: CP nHb (typical)
Power Level Pr 100 (as set)
Audio: Aud 22 (as set)
LECtro
941r1.1 (typical)
Menus
Setup is accomplished using menus and setup screens
accessed by holding the UP and DOWN arrow buttons
at turn on, and by pressing the AUDIO and FREQ buttons when the unit is turned on.
Hold UP arrow at turn on.
Hold the UP arrow button in while pressing both AUDIO
and FREQ buttons to access the setup screens below.
It’s easier if you lay the unit on a flat surface and use
two hands to press all three buttons at the same time.
After the first screen loads, press the AUDIO button
repeatedly to switch between the settings. Press the UP
and DOWN arrow buttons for the desired selection.
After the settings are made, press both AUDIO and
FREQ buttons together to exit and turn the power off.
CP (compatibility modes)
Allows the transmitter to be used with 941 Series receivers or IFB systems in the 941 MHz band.
nHb
IFb
NOTE: The nHb compatibility mode is the same
as the NU HYBR mode in the SRc-941 receiver.
new hybrid mode (ETSI compliant)
Lectrosonics IFB systems
Power Down
Initial Power Off
Timer Screen
1) Simultaneously press and hold the AUDIO and
FREQ buttons while observing that the word “Off”
appears in the LCD along with a counter.
2) When the counter reaches “0”, the unit turns off.
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 power turned off,
pressing the AUDIO and
FREQ buttons briefly places
Standby Screen
In this mode the RF output is turned off so all setup
adjustments can be made without interfering with other
systems operating in the same location. The screen
displays “rf OFF” to remind the user that the unit is not
transmitting.
While the unit is in the standby mode, access the setup
screens using the AUDIO and FREQ buttons and make
adjustments using the UP and DOWN arrows.
the unit in Standby Mode.
Pr (power output)
Can be set at 100 for slightly increased range or at 50
for longer battery life.
50
100 100 mW for slightly increased range
NOTE: See battery life table in the specifications
bL (backlight settings)
Adjusts how long the LCD stays lit after pressing
buttons.
5
30
on
StP (Frequency step size)
Sets the increments of frequency adjustment.
100 100 kHz steps
25 25 kHz steps
50 mW output and longer battery life when
maximum range is not necessary
5 minutes
30 seconds
Stays on
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LECTROSONICS, INC.
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