Lectrosonics SMV Body worn wireless microphone transmitter User Manual mm400aman
Lectrosonics Inc Body worn wireless microphone transmitter mm400aman
user manual
1
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
DIGITAL HYBRID WIRELESSTM
ULTRA-MINIATURE
UHF BELT-PACK TRANSMITTER
OPERATING INSTRUCTIONS
SM
Rio Rancho, NM
www.lectrosonics.com
Professional Audio Products Since 1971
2
SM
Professional Audio Products Since 1971
The SM transmitter is FCC type accepted under Part 74: 536-608 MHz and 614-806 MHz
3
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
TABLE OF CONTENTS
GENERAL TECHNICAL DESCRIPTION ...................................................................................................... 4
GENERAL ...................................................................................................................................................................... 4
DIGITAL HYBRID WIRELESS™ TECHNOLOGY .......................................................................................................... 4
NO PRE-EMPHASIS/DE-EMPHASIS ............................................................................................................................ 4
LOW FREQUENCY ROLL-OFF ..................................................................................................................................... 5
INPUT LIMITER .............................................................................................................................................................. 5
DIGITAL SIGNAL PROCESSOR .................................................................................................................................... 5
MICROPROCESSOR, PLL AND VCO CIRCUITS ........................................................................................................ 5
COMPATIBILITY MODES ............................................................................................................................................... 5
PILOT TONE SQUELCH ................................................................................................................................................ 5
CONTROL PANEL .......................................................................................................................................................... 5
WIDE-BAND DEVIATION ............................................................................................................................................... 5
BATTERY LIFE ............................................................................................................................................................... 5
FREQUENCY AGILITY .................................................................................................................................................. 5
CIRCULATOR/ISOLATOR .............................................................................................................................................. 5
CONTROLS AND FUNCTIONS .................................................................................................................... 6
LCD SCREEN ................................................................................................................................................................ 6
PWR LED ....................................................................................................................................................................... 6
AUDIO INPUT JACK ...................................................................................................................................................... 6
MODULATION LEDS ...................................................................................................................................................... 6
AUDIO BUTTON ............................................................................................................................................................. 6
FREQ BUTTON .............................................................................................................................................................. 6
UP/DOWN ARROWS ..................................................................................................................................................... 7
ANTENNA ...................................................................................................................................................................... 7
BATTERY COMPARTMENT AND THUMB SCREW ..................................................................................................... 7
SM SCREEN SELECTIONS .......................................................................................................................... 8
FREQUENCY SCREEN ................................................................................................................................................. 8
AUDIO SCREEN ............................................................................................................................................................ 8
COMPATIBILITY MODE SCREEN ................................................................................................................................. 8
LOCK/UNLOCK SCREEN .............................................................................................................................................. 8
POWER OFF TIMER SCREEN ...................................................................................................................................... 8
BATTERY INSTALLATION ............................................................................................................................ 9
OPERATING INSTRUCTIONS .................................................................................................................... 10
POWER UP AND BOOT SEQUENCE ......................................................................................................................... 10
POWER DOWN ............................................................................................................................................................ 10
SELECTING THE COMPATIBLITY MODE .................................................................................................................. 10
SETTING TRANSMITTER OPERATING FREQUENCY ............................................................................................. 11
ATTACHING A MICROPHONE AND ADJUSTING GAIN ............................................................................................ 11
LOCKING OR UNLOCKING THE CONTROL PANEL ................................................................................................. 12
OPERATING NOTES ................................................................................................................................... 12
5-PIN INPUT JACK WIRING ....................................................................................................................... 13
MICROPHONE RF BYPASSING ................................................................................................................................. 13
LINE LEVEL SIGNALS ............................................................................................................................................ 14
WIRING HOOKUPS FOR DIFFERENT SOURCES .............................................................................................. 14
TROUBLESHOOTING ................................................................................................................................. 15
SPECIFICATIONS AND FEATURES .......................................................................................................... 16
SERVICE AND REPAIR ............................................................................................................................... 17
RETURNING UNITS FOR REPAIR ............................................................................................................. 18
LIMITED ONE YEAR WARRANTY .............................................................................................................. 20
Thank you for selecting the Lectrosonics SM ultra-miniature transmitter. The unique design provides several distinct
features for professional applications:
• Outstanding RF operating range
• Superb audio quality
• Ultra-lightweight, corrosion resistant housing
• Water resistant seals for use in damp environments
• Programmable compatibility modes for maximum versatility
The Digital Hybrid WirelessTM design (US Patent Pending) combines 24-bit digital audio with analog FM techniques
resulting a system that has the same operating range as analog systems (plus the graceful failure at the limits of that
range), the same spectral efficiency as analog systems, the same long battery life as analog systems, with the
excellent audio found in digital systems.
The SM uses a standard Lectrosonics 5-pin type input jack for use with electret lavaliere mic, dynamic mic, or line
level signals. A water resistant control panel with LCD, membrane switches and multi-color LEDs make input gain
adjustments and frequency and compatibility mode selection quick and accurate, without having to view the receiver.
The battery compartment accepts an AA alkaline, lithium or NiMH battery. Plus, the SM is machined from a solid
aluminum block to provide an extremely lightweight and rugged package. A special non-corrosive finish (the same
one used on NASA space vehicles) resists salt water exposure and perspiration in extreme environments.
The DSP-based design offers backward compatibility with Lectrosonics 100 and 200 Series receivers, and some
other brands of analog wireless receivers. Only the SM transmitter is covered in this manual. Companion receivers
are covered in separate manuals.
4
SM
Professional Audio Products Since 1971
SM
Block Diagram
Phase Locked Loop
Voltage
Controlled
Oscillator
11001001
A-D
Converter
Digital Signal Processor
11001001
D-A
Converter
Shunt
Limiter
Bicolor
Modulation
LEDs
Microprocessor
1.5V
Battery
Switching
Power
Supply
+3.3v
+1.8v
+6v
-3v
Servo Bias
Supply
Audio
Encoded
Audio and
Pilot Tone
Reference
Crystal
Bicolor
Power
LED
Mic
Jack
Bias
Voltage
0, 2 or 4 Volts
Audio
Level
Input
Amp
5
4
3
2
1
Final
Amplifier 50
Ohms
Isolator
Control Panel
Up/Down
Switches
Freq
Switch
Audio
Switch
LCD
Hi/Lo
Pass
Filter
+6v
Digital
Pot
*US Patent Pending
GENERAL
The 400 system uses ±75 kHz wide deviation for an
extremely high signal to noise ratio. Switching power
supplies provide constant voltages to the transmitter
circuits from the beginning (1.5 Volts) to the end (0.85
Volts) of battery life, and an ultra low noise op amp is
used as the input amplifier for quiet operation. It is gain
protected with a wide range dual envelope input limiter
which cleanly limits input signal peaks over 30 dB above
full modulation.
Note
The terms 400 Series and Digital Hybrid Wireless™ describe the
same product line and are interchangeable.
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
(known as “pumping” and “breathing”). Wholly digital
systems defeat the noise by sending the audio informa-
tion in digital form, at the cost of some combination of
power, bandwidth and resistance to interference.
Lectrosonics Digital Hybrid Wireless™ systems over-
come 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
GENERAL TECHNICAL DESCRIPTION
a technique that can be accomplished only in the digital
domain, even though the inputs and outputs are analog.
Channel noise still impacts received signal quality and
will eventually overwhelm a receiver. Digital Hybrid
Wireless™ simply encodes the signal to use a noisy
channel as efficiently and robustly as possible, yielding
audio performance that rivals that of wholly digital
systems, without the power 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 resistance to interference. How-
ever, unlike conventional FM systems, it does away with
the analog compandor and its artifacts.
NO PRE-EMPHASIS/DE-EMPHASIS
The Digital Hybrid Wireless™ design results in a signal-
to-noise ratio high enough to preclude the need for
conventional pre-emphasis (HF boost) in the transmitter
and de-emphasis (HF roll off) in the receiver.
LOW FREQUENCY ROLL-OFF
A 12 dB per octave low frequency roll-off is provided in
the audio section, with the -3 dB point at 70 Hz. The
actual roll-off frequency will vary somewhat according to
the low frequency response of the mic capsule being
used.
The low frequency roll-off is used to remove subsonic (or
very low frequency) audio, often produced by air condi-
tioning systems, automobile traffic and other sources
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Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
from the audio signal. Excessive low frequency content
in the audio input can cause a variety of audio problems
including driving the transmitter into limiting.
INPUT LIMITER
A digitally-controlled analog audio limiter is employed
just 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.
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 both keep audio distortion low and preserve short
term dynamic changes.
Two bicolor LEDs indicate limiter activity. (See
Operating
Instructions, Adjusting Audio Levels
.)
DIGITAL SIGNAL PROCESSOR
The DSP encodes the digitized audio from the A-D
Converter and adds an ultrasonic Pilot Tone to control
the receiver's squelch (only in 400 Series, 200 Series
and IFB Compatibility Modes with the Pilot Tone enabled
– see
Pilot Tone Squelch
).
MICROPROCESSOR, PLL AND VCO
CIRCUITS
An 8-bit 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 the correct pilot tone is added to
the endocded signal. (See
Pilot Tone Squelch
.) It also
drives the LCD display, controls the Pilot Tone, operates
the PLL/VCO circuits.
COMPATIBILITY MODES
The SM transmitter was designed to be compatible with
Lectrosonics 400 Series receivers and will yield the best
performance when doing so. However, due to the
flexibility of digital signal processing, the SM is also able
to operate with Lectrosonics 200 Series, Lectrosonics
100 Series, IFB and certain non-Lectrosonics receivers
in special compatibility modes. (Contact the
Lectrosonics Sales Department for a complete list of
compatible receivers.)
PILOT TONE SQUELCH
The Digital Hybrid Wireless™ system uses one of 256
different ultrasonic tones between 25 and 32 kHz, that
modulate the carrier to operate the receiver squelch.
The pilot tone frequency is chosen according to which of
the 256 channels has been selected via the Control
Panel mounted FREQ switch. (See
SM Screen Selec-
tions
.) The pilot tone squelch system ensures the
receiver will remain muted until it receives the pilot tone
from the matching transmitter, even if a strong RF signal
is present on the carrier frequency of the system. 400
Series Compatibility Mode extends this concept even
further by insuring that all transmitters in a system have
different pilot tone frequencies so that even spurious RF
from the wrong transmitters can’t open the receiver
squelch.
CONTROL PANEL
A waterproof control panel which includes four mem-
brane switches and an LCD screen is used to change
and control the operational settings, and also provide a
visual feedback of overall system operation. (See
Controls and Functions.
)
WIDE-BAND DEVIATION
A ±75 kHz deviation improves the capture ratio, signal to
noise ratio and AM rejection of a wireless system
dramatically, compared to other designs that use 30 kHz
to 40 kHz deviation. This combined with a full 100 mW
of power output makes a significant improvement in
signal to noise ratio and maximum operating range.
BATTERY LIFE
Switching power supplies throughout the design allow
about 4.5 hours of operation using a single AA lithium
battery. An alkaline AA battery provides about 2 hours,
and a NiMH AA battery provides about 3.5 hours of
operation. The battery contacts are spring loaded to
prevent “rattle” as the unit is handled.
FREQUENCY AGILITY
The transmitter section uses a synthesized, frequency
selectable main oscillator. The frequency is extremely
stable over a wide temperature range and over time.
Two membrane switches, located on the Control Panel,
provide 256 frequencies in 100 kHz steps over a 25.5
MHz range.
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 at separations of
less than five feet. It also provides additional RF output
stage protection but is rarely seen in a wireless micro-
phone transmitter due to its high cost.
6
SM
Professional Audio Products Since 1971
CONTROLS AND FUNCTIONS
LCD SCREEN
The LCD is a numeric-type Liquid Crystal Display used
in conjunction with the AUDIO and FREQ buttons, and
the UP and Down arrows, to configure the SM. (See SM
SCREEN SELECTIONS.) It is also used with the
Modulation and PWR LEDs to monitor system operation.
PWR LED
The PWR LED glows green when the battery is good.
The color changes to red when there is about 30 min-
utes of operation left with the recommended lithium
battery. (An alkaline battery will have about 20 minutes
of life left.) When the LED begins to flicker red, there are
only a few minutes of life.
Note
A NiMH battery will give little or no warning when it is depleted. If
you wish to use NiMH batteries in the SM, we recommend trying
fully charged batteries in the unit, noting the length of time that the
batteries will run the unit and then using the battery timer feature
available on most 400 Series receivers.
A weak battery will sometimes cause the PWR LED to
glow green immediately after being put in the unit, but
will soon discharge to the point where the LED will go
red or shut off completely.
AUDIO INPUT JACK
The input on the SM accommodates virtually every
lavaliere, hand-held or shotgun microphone available.
Different line level signals can also be accommodated.
(See
LINE LEVEL SIGNALS
and
5-PIN INPUT JACK
WIRING
.)
MODULATION LEDS
The Modulation LEDs provide a visual indication of the
input audio signal level from the microphone. These two
bicolor LEDs can glow either red or green to indicate
modulation levels.
AUDIO BUTTON
Pressing the AUDIO button alone causes the LCD to
display the audio level setting (0 dB to 44 dB). This level
is adjustable via the Up and Down arrows.
Simultaneously pressing the AUDIO button and FREQ
button will power the transmitter on or off.
FREQ BUTTON
The SM provides 256 individual frequencies, in 100 kHz
increments, across a 25.5 MHz frequency block. The
FREQ Button toggles the LCD between displaying the
actual operating frequency in MHz or a two-digit hexa-
decimal number that corresponds to the equivalent
Lectrosonics Frequency Switch Setting.
Signal Level
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 dB
-20 LED -10 LED
Off
Green
Green
Red
Red
Off
Off
Green
Green
Red
Up/Down Buttons
Freq Button
Audio Button
PWR LED
Modulation LEDs
-10
-20
LCD
Battery Compartment
Thumb Screw
Battery Compartment
Cover Plate
Audio Input Jack
Antenna
7
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
Simultaneously pressing the FREQ button and AUDIO
button will power the transmitter on and off.
UP/DOWN ARROWS
The Up and Down arrows are used to select the operat-
ing frequency, adjust the audio level, or set the Compat-
ibility Mode.
Pressing both arrows simultaneously locks the control
panel buttons so they can only be used to display
current settings. A capital “L” appears in the display to
indicate the controls are locked.
To unlock the control panel, press both arrows again.
“unL” appears in the display to indicate that the control
panel is unlocked.
The lock status, locked or unlokced, is preserved even if
the unit is shut off.
ANTENNA
The fixed flexible cable antenna is supplied with the
transmitter. This antenna is cut to the 1/4 wavelength of
the center of the frequency block (the frequency range)
of the transmitter.
BATTERY COMPARTMENT AND THUMB
SCREW
The large knurled brass thumbscrew is used to release
or secure the Battery Compartment Cover Plate, allow-
ing access to the battery.
8
SM
Professional Audio Products Since 1971
SM SCREEN SELECTIONS
Five screens are used to set up and operate the SM.
These screens are used to set the operating frequency,
adjust the audio modulation level, select the Compatibil-
ity Mode, lock or unlock the control panel and power
down the transmitter
FREQUENCY SCREEN
The Frequency Screen displays
the operating frequency in MHz
when the system is initially
turned on. Pressing the FREQ
button displays the operating
frequency as a two-digit hexa-
decimal number that corre-
sponds to the equivalent Lectrosonics Frequency Switch
Setting.
AUDIO SCREEN
Pressing the AUDIO button
during normal operation displays
the current audio input level
setting.
COMPATIBILITY MODE SCREEN
Holding down the Up arrow button while powering up the
SM opens the Compatibility
Mode screen. By using the Up
or Down arrow buttons, the user
can select one of five compatibil-
ity modes:
•400 - This is the factory default setting and works
with all Lectrosonics 400 Series Digital Hybrid
Wireless™ receivers. This mode offers the best
audio quality.
•200 - This mode works with all Lectrosonics 200
Series compatible receivers.
•100 - This mode works with all Lectrosonics 100
Series compatible receivers.
644.400
CH 2C
Aud 12
CP 400
•3 - (Mode 3) This mode works with a number of
non-Lectrosonics analog receivers. Contact the
company for a list of compatible receivers.
•IFB - This mode works with all Lectrosonics IFB
compatible receivers.
Pressing either the AUDIO or FREQ button leaves this
screen and accesses the screen associated with the
button that was pushed.
LOCK/UNLOCK SCREEN
Simultaneously pressing both the
Up and Down arrow buttons
during normal operation toggles
between locking and unlocking
the front panel controls. (If the
control panel was locked when
the buttons are pushed, it will
toggle to the unlocked condition.)
The LCD will display the Locked/Unlocked condition
while the arrow buttons are pressed, then revert back to
the previous screen when either button is released.
While the AUDIO and FREQ buttons can be used to
display current settings, any attempt to change a setting
by pressing either the Up or Down arrow button when the
Control Panel is locked will temporarily display an “L” in
the LCD.
POWER OFF TIMER
SCREEN
Simultaneously holding the
AUDIO and FREQ buttons while
the unit is operating displays the
Power Off Timer screen. The
screen counts down from three
to zero. Releasing either button
prior to the Power Off Timer
screen indicating zero returns
the unit to normal operation and
displays the previous screen.
The unit turns off only when the Power Off Timer
reaches zero and the AUDIO and FREQ buttons are
released.
L
unL
Control Panel Locked
Control Panel Unlocked
oFF . . .3
Initial Power Off Timer
Screen
End Power Off Timer
Screen
oFF . . .0
LCD
9
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
The transmitter is powered by a standard AA 1.5 volt
battery. We recommend using lithium battery for longest
life. Lithium batteries provide over 4.5 hours of operation
at room temperature.
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 a new battery:
1. Turn the Battery Cover Plate Thumbscrew
counter-clockwise, open the battery
compartment and remove any old battery.
2. Insert the new battery into the SM housing.
Take note of the polarity marked on the case
showing the location of the positive (+) and
negative (-) terminals. The positive (+) battery
terminal goes into the transmitter first.
3. Replace the Battery Cover Plate and tighten
the Battery Cover Plate Thumbscrew.
BATTERY INSTALLATION
AA Battery
Battery
Compartment Battery
Cover Plate
Thumbscrew
Battery
Cover Plate
10
SM
Professional Audio Products Since 1971
with 200 Series, 100 Series and IFB analog receivers,
plus some other analog wireless receivers (contact the
factory for details). Setting the Compatibility Mode of the
transmitter to match the receiver is easily done via the
Control Panel.
Note
The unit comes from the factory configured as a 400 Series
transmitter.
1) Set the receiver’s audio controls to minimum.
2) Power up the SM and observe the Boot
Sequence. If the Compatibility Mode for the
SM does not match the corresponding
receiver, then power off the SM transmitter.
3) From a power off condition, hold down the Up
arrow, then simultaneously press the AUDIO
and FREQ buttons.
4) The LCD will display the current Compatibility
Mode. Use the Up or Down
arrow buttons to reset the
Compatibility Mode to
match the corresponding
receiver.
The following Compatibility
Modes are available:
• 100 Series mode: CP 100
• 200 Series mode: CP 200
• Mode 3 (Contact dealer for details): CP 3
• 400 Series mode: CP 400
• IFB Series mode: CP IFB
5) Press the AUDIO or FREQ to exit this function.
The Compatibility Mode selected in Step 4 will
be the current Compatibility Mode until reset
using this procedure.
SETTING TRANSMITTER OPERATING
FREQUENCY
The Operating Frequency of the SM can be displayed
either in MHz or as a two-digit hexadecimal number.
POWER UP AND BOOT SEQUENCE
1) Ensure that a good battery is installed in the
unit. (See
Battery Installation
.)
2) Simultaneously press the AUDIO and FREQ
buttons. As the unit turns on, the Modulation
LEDs and PWR LED all glow red, then they all
glow green. Then, they revert to normal
operation, i.e., the Modulation LEDs glow
according to the AUDIO level setting and the
PWR LED glows green (providing the battery
is in good condition).
The LCD displays a bootup sequence which
consists of four screens:
Company Name: Lectro
Frequency Block (bXX) and
Firmware Version (rX.X): b21r1.1 (typ)
Compatibility Mode: CP 400 (typ)
Frequency: 550.300 (typ)
POWER DOWN
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”, release the AUDIO and
FREQ buttons to turn off
the unit.
Note
If the AUDIO and FREQ buttons are released before the counter
reaches “0,” the unit will not turn off. Instead, it will stay energized
and the display will return to the previous screen.
SELECTING THE COMPATIBLITY MODE
All Digital Hybrid Wireless™ receivers are capable of
working with the Lectrosonics SM transmitter. By select-
ing the proper compatibility mode, the SM will also work
OPERATING INSTRUCTIONS
oFF . . .3
Initial Power Off Timer
Screen
End Power Off Timer
Screen
oFF . . .0
AUDIO Button
LCD
FREQ Button
Modulation LEDs
PWR LED
Control Panel
AUDIO Button
LCD
FREQ Button
UP Arrow
CP 400
400 Series or Digital
Hybrid Wireless™
Compatibility Mode
11
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
(See
Controls and Functions, Frequency Screen
.) Use
the following procedure to change the Operating Fre-
quency of the SM transmitter:
1) If the LCD is displaying something other than
the Frequency Screen, press the FREQ button
on the SM Control Panel to enter the
Frequency Screen.
Note
The default is to display the operating frequency in MHZ. Pressing
the FREQ button again displays the operating frequency as a two-
digit hexadecimal number that corresponds the equivalent
Lectrosonics Frequency Switch Setting.
2) Use the Up or Down arrow buttons to move
the operating frequency up or down in 100
kHz increments from the current setting.
Note
The operating frequency displayed on the LCD wraps as it reaches
the upper or lower end of its range. Thus, if you intend to move the
operating frequency from the lower end of the range to the upper
end, it may be faster to do this by using the Down arrow until the
frequency wraps to the upper end.
Most Lectrosonics receivers indicate the
operating frequency both in MHz and as a two
digit hexadecimal number.
This conforms to the
Lectrosonics tradition of
setting the operating
frequency using two 16-
position rotary switches.
The SM offers the ability to
set the operating frequency
in a smililar manner.
Pressing the FREQ button
while the LCD displays the
operating frequency in MHz
will change the display to
show the equivalent two-digit hexadecimal
frequency select switch setting. Simply use
the Up or Down arrow to increase or decrease
the operating frequency. Pressing the FREQ
button will toggle the display back to MHz.
ATTACHING A MICROPHONE AND
ADJUSTING GAIN
The front panel Modulation LEDs indicate limiter activity.
(See chart below.) Once set, the transmitter’s audio
level setting should not be used to control the volume of
your sound system or recorder levels. This gain adjust-
ment matches the transmitter gain with the microphone’s
output level, the user’s voice level and the microphone’s
position.
Note
Different voices will usually require different settings of the AUDIO
control, so check this adjustment as each new person uses the
system. If several different people will be using the transmitter and
there is not time to make the adjustment for each individual, adjust it
for the loudest voice.
1) Mute the main sound system, then insert the
microphone plug into the input jack, aligning
the pins and ensuring that the connector
locks.
2) Turn on the transmitter and press the AUDIO
button. (It is not necessary to wait until the
Boot Sequence is complete before pressing
the AUDIO button.)
3) Position the microphone in the location where
it will be used in actual operation.
4) Observe the SM Modulation LEDs while
speaking or singing into the microphone at the
same voice level that will be used during the
program. Press the Up or Down arrow buttons
until the both the -20 and -10 LEDs glow
green, with the -10 LED occassionally
flickering red. (-10 dB to +0 dB Signal Level
LCD
FREQ Button
Up and Down
Arrow Buttons
CH 2C
Frequency displayed as
two-digit hexadecimal
number
644.400
Frequency displayed in
MHz AUDIO Button
LCD
Up and Down
Arrow Buttons
Modulation LEDs
Audio Input Jack
12
SM
Professional Audio Products Since 1971
as show in the chart below with only
occassional forays into the +0 dB to +10 dB
range.)
Setting the audio level to high reduces the dynamic
range of if the audio signal. Setting the audio level
to low may cause hiss and noise in the audio.
5) Once the SM’s audio gain has been set, the
remaining components of the audio system
can be energized and adjusted.
L
Control Panel Locked
LOCKING OR UNLOCKING THE CONTROL
PANEL
The Lock/Unlock function insures against unwanted
operational changes to the SM during normal operation.
Note
The Locked/Unlocked status is non-volitile and is preserved even if
the unit is turned off.
1) Ensure the SM setup is complete (operating
frequency, Compatibility Mode, audio level,
etc.).
2) Simultaneously press both
the Up and Down arrow
buttons. An “L” is
displayed on the LCD.
The LCD will return to the
previous display when these buttons are
released.
3) To Unlock the Control
Panel, repeat Step 4. A
“unL” is displayed on the
LCD.
unL
Control Panel Unlocked
Signal Level
Less than -20 dB
-20 dB to -10 dB
-10 dB to +0 dB
+0 dB to +10 dB
Greater than +10 dB
-20 LED -10 LED
Off
Green
Green
Red
Red
Off
Off
Green
Green
Red
13
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
electret microphones provided the microphone
has its own built-in battery.
PIN 4 Bias voltage selector for Pin 3. Pin 3 voltage (0,
2 or 4 volts) depends on Pin 4 connection.
Pin 4 tied to Pin 1: 0 V
Pin 4 Open: 2 V
Pin 4 to Pin 2: 4 V
PIN 5 High impedance, line level input for tape decks,
mixer outputs, musical instruments, etc.
MICROPHONE RF BYPASSING
Some mics require RF protection to keep the radio signal
from affecting the capsule, even though the transmitter
input circuitry is already RF bypassed (see schematic
diagram).
If the mic is wired as directed, and you are having
difficulty with squealing, high noise, or poor frequency
response; RF is likely to be the cause.
The best RF protection is accomplished by installing RF
bypass capacitors at the mic capsule. If this is not
possible, or if you are still having problems, capacitors
can be installed on the mic pins inside the TA5F connec-
tor housing.
Install the capacitors as follows: Use 330 pF capacitors.
Capacitors are available from Lectrosonics. Please
specify the part number for the desired lead style.
Leaded capacitors: P/N 15117
Leadless capacitors: P/N SCC330P
All Lectrosonics lavaliere mics are already bypassed and
do not need any additional capacitors installed for proper
operation.
LINE LEVEL SIGNALS
The normal hookup for line level signals is: Signal Hot
to pin 5, Signal Gnd to pin 1 and pin 4 jumped to pin 1.
This allows signal levels up to 3V RMS to be applied
without limiting.
The wiring diagrams included in this section represent
the basic wiring necessary for the most common types
of microphones and other audio inputs. Some micro-
phones may require extra jumpers or a slight variation
on the diagrams shown.
It’s virtually impossible to keep completely up to date on
changes that other manufacturers make to their prod-
ucts. It is possible that you may encounter a microphone
that differs from these instructions. If this occurs please
call our toll-free number listed under Service and Repair
in this manual or visit our web site at:
http://www.lectrosonics.com
When used on a wireless transmitter, the microphone
element is in the proximity of the RF coming from the
transmitter. The nature of electret microphones makes
them sensitive to RF, which can cause problems with the
microphone/transmitter compatibility. If the electret
microphone is not designed properly for use with wire-
less transmitters, it may be necessary to install a chip
capacitor in the mic capsule or connector to block the RF
from entering the electret capsule. (See
RF Bypassing
.)
The Audio Input Jack for the SM is wired as shown
below:
PIN 1 Shield (ground) for positive biased electret
lavaliere microphones. Shield (ground) for
dynamic microphones and line level inputs.
PIN 2 Bias voltage source for positive biased electret
lavaliere microphones.
PIN 3 Low impedance microphone level input for
dynamic microphones. Also accepts hand-held
5-PIN INPUT JACK WIRING
3 WIRE MIC2 WIRE MIC
CAPSULE CAPSULE
SHIELD
AUDIO
SHIELD
AUDIO
BIAS
Alternate locations for bypass capacitors
TA 5 F
CONNECTOR
TA 5 F
CONNECTOR
Preferred locations for bypass capacitors
SM Equivalent Input Circuit Wiring
10k
1k
5
4
3
2
1
To Virtual Ground
Audio Amplifier
BIAS
MIC
SOURCE LOAD
LINE IN
GND
+30uF
+6 VDC
Servo Bias
Pin 4 to Pin 1 = 0 V
Pin 4 Open = 2 V
Pin 4 to Pin 2 = 4 V
+
To Limiter Control
30uF
750 Ohm
100 Ohm
2.7K
200 Ohm
+
3.3uF
Audio Input Jack
14
SM
Professional Audio Products Since 1971
3
1
2
DYNAMIC
MIC LEVEL
1
2
3
4
5
3
2
1
PIN PIN
SHIELD
SHIELD
TIP
PIN
5
4
3
2
1
SLEEVE
LINE LEVEL
RCA or 1/4 " PLUG
1
2
3
4
5
PIN
PIN
5
4
3
2
1
SHIELD
AUDIO
SHIELD
AUDIO
BIAS
3 WIRE ELECTRET MIC
POSITIVE BIAS
4 V BIAS SHOWN
1
2
3
45
TA5F
PLUG
2 WIRE ELECTRET MIC
POSITIVE BIAS
4 V BIAS SHOWN
AUDIO
Dynamic LO Z mic or electret with
manufacturer’s power supply.
1
2
3
45
TA5F
PLUG
1
2
3
45
TA 5 F
PLUG
1
2
3
45
TA 5 F
PLUG
(DISCONNECT JUMPER BETWEEN PINS 2 AND 4
FOR 2 V BIAS — COUNTRYMAN E6 and B6 MICS)
(CONNECTING PIN 4 TO PIN 1 SHUTS OFF BIAS)
PIN
5
4
3
2
1
SHIELD (GND)
AUDIO
Line Level
Normal Hookup
1
2
3
45
TA5F
PLUG
PIN
5
4
3
2
1
AUDIO
Line Level
More Headroom 1
2
3
45
TA5F
PLUG
100k
SHIELD (GND)
If more headroom is needed, insert a 100k resistor in
series with pin 5. Put this resistor inside the TA5F
connector to minimize noise pickup.
WIRING HOOKUPS FOR DIFFERENT SOURCES
15
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that
you follow these steps in the sequence listed.
SYMPTOM POSSIBLE CAUSE
TRANSMITTER PWR LED OFF 1) Battery is inserted backwards.
2) Battery is dead.
3) Transmitter not powered up. (See
Operating Instructions, Power
UP and Boot Sequence.
)
NO TRANSMITTER MODULATION LEDs1) Gain control set to minimum.
2) Battery is in backwards. Check PWR LED.
3) Mic capsule is damaged or malfunctioning.
4) Mic cable damaged or mis-wired.
RECEIVER RF INDICATOR OFF 1) Transmitter not turned on.
2) Transmitter battery is dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency. Check
switches/display on transmitter and receiver.
5) Transmitter and receiver not on same frequency block.
6) Operating range is too great.
7) Defective transmitter antenna.
NO SOUND (OR LOW SOUND LEVEL),
RECEIVER INDICATES PROPER AUDIO
MODULATION 1) Receiver output level set too low.
2) Receiver output disconnected, or cable defective or mis-wired.
3) Sound system or recorder input is turned down.
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check SM
Modulation LEDs and receiver audio levels as SM is being used.
2) Receiver output may be mis-matched with the sound
system or recorder input. Adjust output level on receiver
to the correct level for the recorder, mixer or sound
system. (Use the receiver’s Tone function to check level
settings.)
3) Excessive wind noise or breath “pops.” Reposition
microphone and/or use a larger windscreen.
4) Transmitter is not set to same frequency as receiver.
Check that operating frequency on receiver and
transmitter match.
5) Receiver/Transmitter Compatibility Mode mismatched.
HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.
2) Receiver antenna missing or obstructed.
3) Transmitter antenna missing.
4) Operating range too great.
5) Signal interference. Turn off transmitter. If receiver’s signal
strength indicator does not drop to nearly zero, this indicates an
interferring signal may be the problem. Try a different operating
frequency.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain
adjustment and/or reduce receiver output level.
2) Talent standing too close to speaker system.
3) Mic is too far from user’s mouth.
“L” APPEARS IN DISPLAY WHEN ANY
BUTTON IS PRESSED 1) Control Panel is locked. (See
Operating Instructions, Locking
and Unlocking the Control Panel.
)
TROUBLESHOOTING
16
SM
Professional Audio Products Since 1971
Operating frequencies:Block 21 537.600 - 563.100
Block 22 563.200 - 588.700
Block 23 588.800 - 607.900 and 614.100 - 614.300
Block 24 614.400 - 639.900
Block 25 640.000 - 665.500
Block 26 665.600 - 691.100
Block 27 691.200 - 716.700
Block 28 716.800 - 742.300
Block 29 742.400 - 767.900
Frequency selection: 256 frequencies in 100 kHz steps per 25.5 MHz wide block
Channel Spacing:100 kHz
Frequency adjustment: Control panel mounted membrane switches
RF Power output: 100 mW (nominal)
Compatibility Modes:There are five- Digital Hybrid Wireless™ (400 Series), 200 Series, 100 Series, Mode 3 (other analog) and IFB
Pilot tone: 25 to 32 kHz; 5 kHz deviation (in 400 Series Mode)
Frequency stability: ± 0.002%
Deviation: ± 75 kHz max. (in 400 Series Mode)
Spurious radiation: 60 dB below carrier
Equivalent input noise: –125 dBV, A-weighted
Input level: Nominal 2 mV to 300 mV, before limiting.
Greater than 1.5V maximum, with limiting.
Input impedance: 2 kOhm
Input limiter: Soft limiter, >30 dB range
Gain control range: 40 dB; panel mounted membrane switches
Modulation indicators:Dual bicolor LEDs indicate modulation of –20, -10, 0, +10 dB referenced
to full modulation.
Low frequency roll-off: –12 dB/octave; 70 Hz
Controls:Control panel with LCD and four membrane switches.
Audio Frequency Response: 70 Hz to 20 kHz, +/-1dB
(The audio is deliberately rolled off at 70 Hz using a
12 dB/octave filter. This filter cannot be disabled.)
Signal to Noise Ratio (dB):
(overall system, 400 Series
mode)
Total Harmonic Distortion: 0.2% typical (400 Series mode)
Audio Input Jack: Switchcraft 5-pin locking (TA5F)
Antenna: Fixed, flexible wire.
Battery: 1.5 Volt AA lithium recommended
Battery Life: 2 hours (alkaline); 4.5 hours (lithium)
Weight: 3.6 ozs. (102 grams) with lithium battery
Overall Dimensions:3.03 x 2 x 0.69 inches (not including microphone)
Emission Designator: UNK AT THIS TIME
Specifications subject to change without notice.
SPECIFICATIONS AND FEATURES
The FCC requires that the following statement be included in this manual:
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 co-located or operating in conjunction with any
other antenna or transmitter.
SmartNR No Limiting W/ Limiting
OFF
NORMAL
FULL
103.5
107.0
108.5
108.5
111.5
113.0
(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)
17
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
SERVICE AND REPAIR
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Verify the integrity of the
interconnecting cords and then go through the TROUBLESHOOTING section in the manual.
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop
attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose con-
nection, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units.
Once set at the factory, the various controls and trimmers do not drift with age or vibration and never require read-
justment. There are no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS service department is equipped and staffed to quickly repair your equipment. In-warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a
modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong
as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate
charges by phone for out-of-warranty repairs. Our number is (505) 892-4501; Toll Free: (800) 821-1121.
18
SM
Professional Audio Products Since 1971
RETURNING UNITS FOR REPAIR
You will save yourself time and trouble if you will follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to
know the nature of the problem, the model number and the serial number of the equipment. We also need a phone
number where you can be reached 8 am to 4 pm (Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed
your repair through our receiving and repair departments. The return authorization number must be clearly shown
on the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for
safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or damage
to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Mailing address: Shipping address: Telephones:
Lectrosonics, Inc. Lectrosonics, Inc. Regular: (505) 892-4501
PO Box 15900 581 Laser Rd. Toll Free (800) 821-1121
Rio Rancho, NM 87174 Rio Rancho, NM 87124 FAX: (505) 892-6243
USA USA
World Wide Web:
http://www.lectrosonics.com
Email:
sales@lectrosonics.com
19
Frequency Agile UHF Ultra-Miniature Belt-Pack Transmitter
Rio Rancho, NM – USA
LIMITED ONE YEAR WARRANTY
581 LASER ROAD
RIO RANCHO, NM 87124 USA
www.lectrosonics.com May 15, 2004
Professional Audio Products Since 1971
LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.