Lectrosonics MM400E WIRELESS MICROPHONE TRANSMITTER User Manual USERS MANUAL

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INSTRUCTION MANUAL
MM400C
Watertight Miniature UHF Belt-Pack Transmitter
Featuring Digital Hybrid Wireless® Technology
Fill in for your records:
Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
MM400C
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Thank you for selecting the Lectrosonics MM400C
watertight miniature transmitter. The unique design
provides several distinct features for professional applications:
• Outstanding RF operating range
• Superb audio quality
• Ultra-lightweight, corrosion resistant housing
• Watertight seals for use in wet environments
• Programmable emulation modes for maximum
versatility
The patented Digital Hybrid Wireless® design combines
24-bit digital audio with analog FM techniques to provide the operating range of the finest analog wireless
systems and the audio quality of a pure digital system.
The 100 mW RF output power extends operating range,
and the DSP controlled, dual-envelope limiter cleanly
handles input peaks to allow higher gain settings. This
combination maximizes operating range and the signal
to noise ratio of the system.
LEDs are provided to make input gain adjustments
quick and accurate, without having to view the receiver.
The battery compartment accepts AA alkaline, lithium
or NiMH batteries, and a detachable antenna ¼ wavelength flexible cable connects to a watertight 50 Ohm
SMA port on the transmitter.
The MM400C is machined from a solid aluminum block
to provide the lightweight, rugged package needed in
extreme environments without compromising functionality.  Input jacks and controls are O-ring sealed for watertight protection in wet environments. A special noncorrosive finish resists salt water exposure and perspiration
in extreme environments.
The DSP-based design offers backward compatibility
with a handful of earlier analog designs, such as the
Lectrosonics 100 and 200 Series receivers, and some
other brands of analog wireless receivers. Compatibility Modes are easily selected with a sequence of
frequency switch settings and cycling the unit’s power.
Only the MM400C transmitter is covered in this manual.
Companion receivers are covered in separate manuals.
The input provides 6 VDC bias voltage for use with
modern electret lavaliere microphones. Multi-color
Rio Rancho, NM
MM400C
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Table of Contents
General Technical Description...............................................................................................................................................................6
General..................................................................................................................................................................................................6
Digital Hybrid Wireless® Technology*.....................................................................................................................................................6
Low Frequency Roll-Off.........................................................................................................................................................................6
Input Limiter...........................................................................................................................................................................................7
Digital Signal Processor.........................................................................................................................................................................7
Microprocessor, PLL and VCO Circuits.................................................................................................................................................7
Compatibility Modes...............................................................................................................................................................................7
Pilot Tone Squelch.................................................................................................................................................................................7
Wide-Band Deviation.............................................................................................................................................................................7
Magnetic Power ON/OFF Switch...........................................................................................................................................................7
Battery Life.............................................................................................................................................................................................7
Frequency Agility...................................................................................................................................................................................7
Circulator/Isolator...................................................................................................................................................................................7
Controls and Functions..........................................................................................................................................................................8
Preventing Internal Corrosion................................................................................................................................................................8
Power ON/OFF Switch...........................................................................................................................................................................8
Power LED.............................................................................................................................................................................................8
Mic Jack.................................................................................................................................................................................................9
Audio Level............................................................................................................................................................................................9
Modulation LEDs....................................................................................................................................................................................9
Frequency Select Switches....................................................................................................................................................................9
Antenna..................................................................................................................................................................................................9
Belt Clip..................................................................................................................................................................................................9
Battery Installation...............................................................................................................................................................................10
Operating Instructions..........................................................................................................................................................................11
Selecting the Compatibility Mode.........................................................................................................................................................11
Adjusting Transmitter Frequency..........................................................................................................................................................11
Attaching a Microphone and Adjusting Audio Levels...........................................................................................................................12
Power Switch Function Selection.........................................................................................................................................................13
Determine Power Switch Function Mode.........................................................................................................................................13
Changing Power Switch Function.....................................................................................................................................................13
Replacing the Power Switch Magnet Housing Assembly..................................................................................................................14
Microphone RF Bypassing...................................................................................................................................................................15
Replacement Parts and Accessories...................................................................................................................................................16
UHF Transmitter Antenna Specifications.............................................................................................................................................16
Troubleshooting.....................................................................................................................................................................................17
Specifications and Features.................................................................................................................................................................18
Service and Repair................................................................................................................................................................................19
Returning Units for Repair...................................................................................................................................................................19
Rio Rancho, NM
MM400C
General Technical Description
General
The 400 Series (or Digital Hybrid Wireless®) system
uses 75 kHz wide deviation for an extremely high signal
to noise ratio. The 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.
The input amplifier uses an ultra low noise op amp for
quiet operation. It is gain controlled with a wide range
dual envelope input compressor 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 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 information in digital form, at the cost of some combination of
power, bandwidth 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 informa-
tion 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, even though the inputs and
outputs are analog signals.
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. However,
unlike conventional FM systems, the Digital Hybrid has
done away with the analog compandor and its artifacts.
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, such as that produced by
air conditioning systems or automobile traffic 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.  For example, in sound reinforcement systems, as one instance,
excessive low frequency content can cause excessive
power amplifier drain or even damage to loudspeaker
systems.
+5V Bias
11.3 MHz
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Input Limiter
The MM400C transmitters employ a DSP-controlled analog audio limiter 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.) Generally
speaking, some limiting is desirable in normal operation
to improve the signal to noise ratio of the system. The
limiting action is not audible and does not create distortion.
Digital Signal Processor
The DSP constructs the original digitized audio from the
A-D Converter, adds an ultrasonic Pilot Tone to control the receiver’s squelch (only in 400 Series and 200
Series Compatibility Mode with the Pilot Tone enabled
– see Pilot Tone Squelch), and implements the user
defined Compatibility Mode.
Microprocessor, PLL and VCO Circuits
An 8-bit microprocessor monitors user command inputs
and numerous other internal signals. It also drives the
Modulation LEDs, controls the Pilot Tone and operates
the PLL/VCO circuits.
Compatibility Modes
The MM400C transmitter was designed to 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 MM400C is
also able to operate with Lectrosonics 200 Series, Lectrosonics 100 Series, IFB and certain non-Lectrosonics
analog receivers in special compatibility modes. (Contact the Lectrosonics Sales Department for a complete
list of compatible transmitters.)
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.
Magnetic Power/Mute Switch
A magnetic switch is used to control the application of
power to the MM400C circuits and as an audio mute
switch. The function of this switch can be set by the
user. (See Controls and Functions, Magnetic Power
ON/OFF Switch.)
Battery Life
Switching power supplies throughout the design allow
over 6 hours of operation using a single AA lithium
battery.  (An alkaline AA battery will provide about 1.75
hours and a 2200 mAh NiMH AA battery will provide
about 4 hours of operating time.) The battery contacts
are spring loaded in order 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 16-position rotary switches, located on the under a
waterproof cover on the bottom of the unit, provide 256
frequencies in 100 kHz steps over a 25.5 MHz range.  
This alleviates carrier interference problems, a definite
problem in mobile or traveling applications.
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 within a few feet of each
other by blocking RF from returning back into the output
stage. It also provides additional RF output stage
protection but is rarely seen in a wireless microphone
transmitter due to its high cost.
Pilot Tone Squelch
The 400 Series wireless system uses an ultrasonic tone
between 25 and 32 kHz to operate the receiver squelch.  
The pilot tone squelch system keeps the receiver 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. The “pilot tone” frequency
is different for each of the 256 available carrier frequencies to prevent the pilot tone from being transferred to
the wrong receiver via an intermodulation product.
Rio Rancho, NM
MM400C
Controls and Functions
Modulation and
Power LEDs
A waterproof, magnetic Power ON/OFF switch is
located on the unit’s side panel. The switch actually
consists of two components. A magnetically actuated
internal component and a magnet housing assembly.
The switch is designed so that the unit will still operate
if the Switch Magnet Housing Assembly is missing or
removed.
Power ON/OFF Switch
(External Switch Magnet
Housing Assembly Shown.)
Frequency Select
SwitchThumbscrew
and Cover Plate
Battery
Compartment
Cap
Antenna
Audio Level Control
Microphone Jack
Preventing Internal Corrosion
It is very important that you properly dry the transmitter
when it becomes wet due to immersion or high levels of
perspiration BEFORE opening any covers or connectors. Follow the procedure below for best results:
1. Carefully blot the transmitter dry with a clean paper
towel or cloth. Remove all moisture. After opening any connector or cover, carefully blot up any
remaining moisture that may have remained around
the seal.
IMPORTANT!  DO NOT CLOSE ANY COVER
OR CONNECTOR BEFORE MAKING CERTAIN
THERE IS NO MOISTURE IN OR NEAR THE
OPENING.
2. After use, it is important to store the transmitter
in a dry place with all access compartments and
connectors opened to allow any internal humidity to
evaporate.  Specifically, open the Battery Compartment, the Frequency Switch Cover Plate and fully
unscrew and remove the microphone connector
before storing. Do not store wet and do not store
sealed. If moisture is sealed inside the unit it has
nowhere to go other than to chemically react with
and destroy components and the printed circuit
board.
3. Lubricate all rubber O-rings with petroleum jelly
(such as Vaseline) after each use (included with
transmitter and O-ring replacement kits). DO NOT
USE ANYTHING OTHER THAN PURE PETROLEUM JELLY. Silicone-based lubricants will dissolve the rubber. Failing to lubricate the O-rings
after each use will significantly shorten their life.
Power ON/OFF Switch
The function of the Power ON/OFF Switch can also be
changed so it operates as an audio mute switch. (See
Operating Instructions, Power Switch Function Selection.) These functions are illustrated in the chart below:
Power Switch Position
Function
ON
OFF
Normal, or
Applies Power
Turns Unit Off
Power Mode
to Unit
Audio Mute
Turns On Audio
Mutes Audio
Mode
If the MM400C Power ON/OFF Switch has been configured for Audio Mute Mode, it is still possible to turn
off the transmitter without removing the battery. This
is done by placing the switch in the ON position, then
toggling the switch between the ON and OFF position
three times in less than five seconds, i.e., ON (Starting
Position)-OFF-ON-OFF-ON-OFF.
The user-selected configuration of the Power ON/OFF
switch is stored in memory and persists until reconfigured by the user.
Power LED
The PWR LED provides an indication of the battery’s
condition.  The PWR LED glows green when the battery
is good. The color changes to red when there is about
30 minutes of operation left with the recommended
lithium battery. (An alkaline battery will have about 20
minutes of life left.)  When the LED begins to blink red,
there are only a few minutes of life left in the battery.
The PWR LED blinks red for a short period when the
transmitter is configured for Normal Mode and the
Power ON/OFF switch is set to OFF.  At the end of the
power off sequence, then PWR LED extinguishes.
Note: A NiMH battery gives little or no warning
when it is depleted. If you use NiMH batteries in
the MM400C, we recommend trying fully charged
batteries first, noting the length of time that the
batteries will run the unit , then plan for somewhat
less time to determine when the battery needs to
be replaced. Some Lectrosonics receivers have
timers for use with these batteries.
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 blink
red or shut off completely.
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Mic Jack
Frequency Select Switches
The Mic Jack is a 2.5 mm microplug that is wired to accommodate two-wire positive bias lavalieres.  While the
M152-WP (waterproof) is specifically designed for the
MM400C, other two-wire lavaliere microphones can be
adapted to the MM440C using the WPMC-3 or WPMC10 kits.  A Switchcraft 850 connector (Lectrosonics P/N
21357) can be used in an emergency though it is not
waterproof. (See Replacement Parts and Accessories.)
The equivalent input circuit wiring for the Mic Jack is
shown below:
2k
2k
FB
100
330pF
330pF
Mic
Jack
6V Mic Bias
30uF
2k
To Mic Amp
2.2nF
FB
Audio Level
Two 16-position rotary Frequency Select Switches are
used to select the operating frequency, for setting Compatiblity Modes and for configuring the Power ON/OFF
switch.
The switches are accessed by loosening the retaining
screw holding the cover plate, lifting the cover away
from the housing and rotating it to expose the switches.
For setting the operating frequency, the left switch
(1.6MHz) adjusts the operating frequency up or down in
1.6 MHz increments.  The right switch (100kHz) adjusts the frequency up or down in 100 kHz increments.  
(See Operating Instructions, Adjusting the Transmitter
Frequency.)
A sequence of Frequency Select Switch settings and
Power ON/OFF toggles are used to set Compatibility
Modes and for configuring the Power ON/OFF switch.  
(See Operating Instructions, Setting Compatibility
Modes and Power Switch Function Selection.)
The Audio Level Control is used to adjust the audio
input level from the microphone for proper modulation of
the output signal from the transmitter.
Modulation LEDs
The two bicolor Modulation LEDs provide a visual
indication of the audio signal level input from the microphone. These LEDs can glow either red or green
to indicate modulation levels as shown in the following
chart.
Signal Level
Less than -20 dB
-20 LED
-10 LED
  Off
  Off
-20 dB to -10 dB
Green
-10 dB to +0 dB
Green
Green
+0 dB to +10 dB
Red
Green
Greater than +10 db
Red
Red
  Off
When the Power ON/OFF Switch is configured for Audio
Mute Mode, the -10 Modulat ion LED is also used to
indicate if the transmitter is in an audio muted, or an
unmuted condition. In Audio Mute Mode, if the Power
ON/OFF switch is set to OFF, the transmitter remains
powered up; however, the audio is muted and the -10
Modulation LED blinks green.
If the Power ON/OFF switch is set to ON and the switch
is configured for Audio Mute Mode, -10 and -20 LEDs
operate normally to indicate audio level.
Rio Rancho, NM
F 0 1
9 8 7
F 0 1
9 8 7
100K
1.6M
Frequency Select Switches
Antenna
The permanently-mounted, flexible steel cable antenna
is cut to 1/4 wavelength of the center of the frequency
block (the frequency range) of the transmitter.
Belt Clip
The belt clip may be removed for special applications
by gently spreading the spring wire clip and pulling
the ends out of the holes in the case. The clip can be
installed in either the up or down position so that when
the transmitter is worn, the antenna can be pointing up
or down. Replacement belt clips are available. (See
Replacement Parts and Accessories.)
MM400C
Battery Installation
WARNING: Do not open battery compartment
if unit is wet. Read “Preventing Internal
Corrosion” on page 8 before proceeding.
The transmitter is powered by a standard lithium, NiMH
or alkaline AA 1.5 volt battery.  The battery status
circuitry is designed for the voltage drop over the life of
lithium batteries.  While NiMH rechargeable batteries
will work, they run down quite abruptly.  Because of this,
using the PWR LED to verify battery status not reliable
with NiMH batteries. It is possible to track battery status
using the Battery Timer function available in a number of Lectrosonics receivers. (Refer to your receiver
manual to determine if this function is available.
Alkaline batteries provide about 1.75 hours of operation
with some warning. Lithium batteries can be used to
provide over 6 hours of operation and provide about 30
minutes of warning as the LED turns red.
Battery Compartment
Note: Standard zinc-carbon batteries marked
“heavy-duty” or “long-lasting” are not adequate.
To access the battery compartment, unscrew and
remove the Battery Compartment Cover.  Take note of
the polarity marked on the battery case showing the
location of the positive (+) and negative (-) terminals.  
The positive (+) battery terminal goes into the transmitter first.  Screw the Battery Compartment Cover back
into the transmitter body. If the battery is inserted incorrectly, the cover will not screw in easily and the unit will
not work.
10
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Operating Instructions
Selecting the Compatibility Mode
All Digital Hybrid receivers are capable of working with
Lectrosonics MM400C transmitter, and by setting the
proper Compatibility Mode, the unit will also work with
200 Series and 100 Series analog receivers, plus some
other brands (contact the factory for details). In order
to operate properly, the transmitter must be set to the
operating mode of the matching receiver, which is easily
done using a small screwdriver and a battery.
The following procedure assumes that the Power
ON/OFF switch is configured for Normal Mode.  If it
has been configured for Audio Mute Mode, see Power
Switch Function Selection to change the configuration
to Normal Mode.
Note: The unit comes from the factory in the Digital
Hybrid mode.
1) Set the audio controls for the corresponding receiver to minimum.
2) Install a good battery in the transmitter. Move the
Power Switch to ON and observe the Modulation
LEDs to determine the current Compatibility Mode.
The –20 and –10 LEDs will blink simultaneously:
•
•
•
•
•
Once for 100 Series mode
Two times for 200 Series mode
Three times for “Other” receivers
Four times for 400 Series mode
Five times for IFB Series mode
3) Move the Power Switch to the OFF position.
4) Loosen the Frequency Switch Cover Plate
Retaining Screen and rotate the cover to
expose the Frequency Select Switches.  
With a small screwdriver (included
with your unit), set the Frequency
Select Switches to CC. (for
Change, Change).
the transmitter Off.
6) Change the Frequency Select Switch settings to
one of the following positions:
•
•
•
•
•
100 Series mode:
200 Series mode:
Mode 3:
400 Series mode:
IFB Series mode:
1,1
2,2
3,3
4,4
5,5
7) Power up the unit briefly – just long enough to
watch the LED’s glow and then turn the transmitter
Off.
8) Set the Frequency Select Switches to 0,0.
9) Turn on the transmitter and observe the Modulation
LEDs to verify the compatibility mode for the unit
has changed.
NOTE: Each time the transmitter is turned on, the
Modulation LEDs will confirm the current operating
mode with the number of blinks listed in Step 2.
The mode setting will not change until reset with
the procedure listed above.
Adjusting Transmitter Frequency
If you are experiencing interference from another signal
on your operating frequency, you may need to change
the operating frequency of your system. This is done
through two Frequency Select Switches located under
the Frequency Switch Cover Plate on the bottom of the
transmitter case.
1.6M
F 0 1
9 8 7
100K
F 0 1
9 8 7
5) Power up the unit briefly – just
long enough to watch the
LED’s glow and then turn
Frequency Select Switches
Modulation LEDs
POWER LED
Power ON/OFF
Switch
Rio Rancho, NM
The left switch is for coarse frequency adjustment, and
it increments the operating frequency in 1.6 MHz steps.  
The right switch is for fine frequency adjustment and it
increments the operating frequency in 100 kHz steps.  
If you are using a 200 Series or 400 Series receiver,
it is suggested to use the built in frequency spectrum
scanning function on the associated receiver to find a
clear channel. Turn the transmitter off and leave the
receiver turned on. Scan across the frequency band to
find a frequency where little or no RF activity is displayed. Set both the transmitter and the receiver to this
new frequency. Turn on the transmitter to ensure the
RF signal is strongly indicated at the receiver.
11
MM400C
NOTE: All 400 Series (and a number of earlier
receivers) offer a front panel LCDs that indicate the
correct transmitter switch settings when locating
clear channels. Use the scanning functions on
these receivers to find a clear channel, then switch
both the receiver and transmitter to the Frequency
Select Switch settings indicated in the receiver’s
display.
If you are using a 100 Series receiver, turn off the transmitter and observe the RF LED on the front panel of the
UCR100 receiver. If it flickers, or glows red, then adjust
the UCR100’s Frequency Select Switches up or down in
100 kHz increments until the RF LED extinguishes.  Set
the MM400C transmitter’s Frequency Select Switches
to the same settings. Turn on the transmitter and observe that the RF LED on the receiver glows brightly.
NOTE: Different voices will usually require different
settings of the Audio Level 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.
7) Once the MM400C’s audio gain has been set, the
remaining components of the audio system can be
energized and adjusted.
WARNING: The AUDIO LEVEL control should
not be used to control the volume of your
sound system or recorder levels. This gain
adjustment matches the transmitter gain
with the user’s voice level and microphone
positioning.
Attaching a Microphone and
Adjusting Audio Levels
The front panel Modulation LEDs indicate limiter activity.
(See chart.) Since the distortion introduced by the limiter is minimal and full modulation is assured, occasional
forays into the red by the -10 LED is acceptable.
1) Install a fresh battery.
2) Insert the watertight microphone plug into the Mic
Jack and screw it in snugly.
WARNING: Do not overtighten as this will
distort the “O-ring” and allow moisture to enter
the unit.
Modulation
LEDs
POWER
LED
3) Mute the main sound system and rotate the Audio
Level Control on the MM400C to maximum counterclockwise (Off).
4) Set the Power ON/OFF switch to the ON position.
5) Position the microphone in the location where it will
be used during in actual operation.
6) Observe the MM400C Modulation LEDS while
speaking or singing into the microphone at
the same voice level that will be used during
the program. Gradually rotate the Audio Level
Control control clockwise until both LEDs glow
green with the -20 dB occasional blinking
red. This indicates full modulation and is the
optimum setting for the transmitter’s gain.
Signal Level
Less than -20 dB
-20 LED
-10 LED
  Off
  Off
-20 dB to -10 dB
Green
-10 dB to +0 dB
Green
Green
+0 dB to +10 dB
Red
Green
Greater than +10 db
Red
Red
Power On/Off
Switch
  Off
Audio
Level
Control
12
Microphone Jack
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Power Switch Function Selection
The Power ON/OFF Switch can also be used as an audio mute switch.  When used as an audio mute switch,
the power switch causes the transmitter’s audio to be
muted when the Power ON/OFF switch is placed in the
OFF position.  The -10 Modulation LED blinks green to
indicate that the transmitter is in Audio Mute Mode.
Power Switch Position
Function
ON
OFF
Normal, or
Applies Power
Turns Unit Off
Power Mode
to Unit
Audio Mute
Turns On Audio
Mutes Audio
Mode
In Audio Mute Mode, the transmitter can still be turned
off by toggling the Power ON/OFF switch rapidly.  Turn
the Power Switch ON then OFF three times (ending
in the OFF position) within five seconds to initiate the
power off sequence. The sequence is ON-OFF-ONOFF-ON-OFF.  
When the transmitter is powered up again, Audio Mute
Mode will persist until the power switch function is
changed.
Determine Power Switch Function Mode
1) If the transmitter is turned off, set the Power Switch
ON and observe the Modulation LEDs.
2) After the power up sequence completes, place the
POWER ON/OFF switch in the OFF position and
observe the -10 Modulation LED.
3) If the PWR LED glows and the -10 Modulation LED
blinks green, the Power Switch is in Audio Mute
Mode.  If the LEDs extinguish, the Power Switch is
in Normal or Power Mode.
1.6M
100K
Frequency Select Switches
Changing Power Switch Function
1) Ensure the Power ON/OFF switch is in the OFF
position.
2) Loosen the Frequency Switch Cover Plate Retaining Screw, pull it away from the transmitter body,
then rotate it to expose the Frequency Select
Switches.
3) With a small screwdriver (included with your unit),
set the Frequency Select Switches to F,F.
4) Rapidly toggle the Power ON/OFF switch to ON
then back to OFF.
5) Change the Frequency Select Switch settings to the
following position:
Normal Mode:
1,1
Audio Mute Mode: 2,2.
5) Rapidly toggle the Power ON/OFF switch to ON
then back to OFF.
6) Set the Frequency Select Switches to 0,0.
7) Rapidly toggle the Power ON/OFF switch to ON
then back to OFF.
8) Turn on the transmitter. After the powerup sequence has completed, set the Power ON/OFF
Switch to OFF and observe the -10 Modulation LED
and the PWR LED.
If the Power ON/OFF switch is configured for Normal Mode, the -10 Modulation LED will go out and
the PWR LED will blink red for a short period then
go out indicating the transmitter has shut down.
If the Power ON/OFF switch is configured for
Audio Mute Mode, the PWR LED continues
to monitor battery condition while the -10
Modulation LED blinks green.
Rio Rancho, NM
13
MM400C
Replacing the Power Switch Magnet Housing Assembly
Although the Power Switch’s Magnet Housing Assembly
is designed to provide years of rugged use it may become inadvertently damaged or lost. Use the following
procedure to install a new Magnet Housing Assembly.
1) If necessary, use a nonmetallic tool such as an
“orange stick” to remove the damaged Magnet
Housing Assembly and clean any debris from the
Magnet Housing Assembly slot. Apply a small
amount of petroleum jelly or white lithium grease to
the area before inserting the new magnet assembly.
Warning: If you use something metallic, as
illustrated in the example, use extreme caution
not to scratch the finish. Breaching the finish
may cause corrosion of the metal housing.
First, center the switch in the slot in the
housing so that the tabs will release
through the wider openings.
2) Notice that the Magnet Housing Assembly Slot has
a wide spot in the middle. Place the new Magnet
Housing Assembly in the slot so that one tab is in a
small groove in one side of the slot.
3) Use a nonmetallic implement to snap the other side
of the Magnet Housing Assembly into the slot.
4) Ensure a good battery is installed, then slide the
new Power ON/OFF Switch to ON to verify that it is
working properly.
14
Magnet Housing
Assembly
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
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.
2 WIRE MIC
Preferred location for bypass capacitors
If the mic is wired as directed, and you are having difficulty with level, 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 wires inside the TA5F connector
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.
Rio Rancho, NM
SHIELD
AUDIO
CAPSULE
MICROPHONE
CONNECTOR
Alternate location for bypass capacitors
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.
15
MM400C
Replacement Parts and Accessories
Part/Model #
Description
26486
Replacement wire belt clip
21357
Non-watertight audio input plug
WPMC-3
Watertight plug kit - 3 pieces
WMPC-10
Watertight plug kit - 10 pieces
P1201-1
Switch Magnet Housing Assembly
UHF Transmitter Antenna Specifications
470
19
20
21
22
23
24
26
25
27
29
28
Lay the transmitter on this template to determine the frequency block
of the antenna. Remove the colored cap for accurate measurement.
All Lectrosonic UHF transmitter antennas follow the
color code specifications in the chart below to identify
operating frequency block range. The frequency block
range is labeled on the ouside housing for each individual transmitter.
FREQUENCY
CAP
ANTENNA
BLOCK
RANGE
COLOR
WHIP LENGTH
470
470.100 - 495.600
Black
5.37”
16
19
486.400 - 511.900
Black
5.16”
20
21
512.000 - 537.500
Black
4.98”
537.600 - 563.100
Brown
4.74”
22
23
563.200 - 588.700
Red
4.48”
588.800 - 614.300
Orange
4.24”
24
614.400 - 639.900
Yellow
4.01”
25
640.000 - 665.500
Green
3.81”
26
665.600 - 691.100
Blue
3.62”
27
691.200 - 716.700
Violet (Pink)
3.46”
28
716.800 - 742.300
Grey
3.31”
29
742.400 - 767.900
White
3.18”
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
Troubleshooting
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) Power ON/OFF switch configured to Normal Mode and is
set to OFF.
NO TRANSMITTER MODULATION LEDs
1)
2)
3)
4)
Verify Transmitter PWR LED is glowing.
Gain control turned all the way down.
Mic capsule is damaged or malfunctioning.
Mic cable damaged or mis-wired.
1) Power ON/OFF Switch is configured for Audio Mute Mode and
-10 MODULATION LED IS BLINKING
the switch is in the OFF, or mute position.  (See Controls and
GREEN AND RECEIVER HAS NO AUDIO
			 Functions.)
RECEIVER INDICATES NO RF
1)
2)
3)
4)
Transmitter not turned on.
Transmitter battery is dead.
Receiver antenna missing or improperly positioned.
Transmitter and receiver not on same frequency.
Check switches/display on transmitter and receiver.
5) Operating range is too great.
NO SOUND (OR LOW SOUND LEVEL),
1)
RECEIVER INDICATES PROPER AUDIO
2)
MODULATION
3)
4)
5)
Receiver output level set too low.
Receiver output is disconnected; cable is defective or connectors
not wired correctly.
Sound system or recorder input is turned down.
Receiver/Transmitter compatibility mode mismatched.
Transmitter audio muted.
1)
DISTORTED SOUND
2)
Transmitter gain (audio level) is far too high. Check Modulation
LEDs on transmitter and receiver as it is being used. (See
Operating Instructions, Attaching a Microphone and Adjusting
Audio Levels.)
Receiver output may be mismatched with the sound system or
recorder input. Adjust output level on receiver to the correct level
for the recorder, mixer or sound system.
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
			 frequency select switches 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) Operating range too great. Check RF level on receiver indicator.
EXCESSIVE FEEDBACK
1) Transmitter gain (audio level) too high. Check gain adjustment
and/or reduce receiver output level.
2) Transmitter too close to speaker system.
3) Mic is too far from user’s mouth.
Rio Rancho, NM
17
MM400C
Specifications and Features
Operating frequencies:
Block 470
Block 19
Block 20
Block 21
Block 22
Block 23
Block 24
Block 25
Block 26
Block 27
Block 28
Block 29
Frequency selection:
RF Power output:
Pilot tone:
Frequency stability:
Deviation:
Spurious radiation:
Equivalent input noise:
Input level:
Input impedance:
Input limiter:
Gain control range:
Modulation indicators:
Low frequency roll-off:
470.100 - 495.600
486.400 - 511.900
512.000 - 537.500
537.600 - 563.100
563.200 - 588.700
588.800 - 607.900 and 614.100 - 614.300
614.400 - 639.900
640.000 - 665.500
665.600 - 691.100
691.200 - 716.700
716.800 - 742.300
742.400 - 767.900
256 frequencies in 100 kHz steps
100 mW (nominal)
25 to 32 kHz; 5 kHz deviation
(in 400 Series Mode)
± 0.002%
± 75 kHz max. (in 400 Series Mode)
60 dB below carrier
–118 dBV, A-weighted
Nominal 2 mV to 300 mV, before limiting.
Greater than 1.5V maximum, with limiting.
2 kOhm
Soft limiter, >30 dB range
43 dB; semi-log rotary control
Dual bicolor LEDs indicate modulation of
–20, -10, 0, +10 dB referenced to full
modulation.
–12 dB/octave; 70 Hz
Controls:
Audio Frequency Response:
Signal to Noise Ratio (dB):
(overall system, 400 Series mode)
Front panel knob adjusts audio gain.
Rotary switches on bottom panel adjust
transmitter frequency.
80 Hz to 20 kHz, +/-1dB, -3 dB @ 70 Hz
(The audio is deliberately rolled off at 70 Hz
using a 12 dB/octave filter. This filter cannot
be disabled.)
SmartNR
No Limiting
w/Limiting
OFF
103.5
108.0
NORMAL
107.0
111.5
FULL
108.5
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)
Total Harmonic Distortion:
Audio Input Jack:
Antenna: Detachable, flexible galvanized steel
Battery:		
Battery Life:
Weight:		
Overall Dimensions:
0.2% typical (400 Series mode)
2.5 mm Microjack (matches Switchcraft 850
Microplug)
with SMA connector. (50 Ohm antenna port
also allows connection to test equipment.)
1.5 Volt AA lithium recommended
1.75 hours (alkaline); over 6 hours (lithium);
3.5 hours (2200 mAhr) NiMH
3.6 ozs. (102 grams) with lithium battery,
no antenna
3.03 x 2 x 0.69 inches (not including
microphone or antenna)
Emission Designator: 180KF3E
Specifications subject to change without notice.
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.
18
LECTROSONICS, INC.
Watertight Miniature UHF Belt-Pack Transmitter
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. Check the interconnecting cables and then go through the Troubleshooting section in this 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 connection, 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 readjustment.
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.
Returning Units for Repair
For timely service, please follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by email 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 A.M. to 4 P.M. (U.S. 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.
Lectrosonics USA:
Mailing address:		
Lectrosonics, Inc.
PO Box 15900
Rio Rancho, NM 87174
USA				
Shipping address:		
Lectrosonics, Inc.
581 Laser Rd.
Rio Rancho, NM  87124
USA
Telephone:
(505) 892-4501
(800) 821-1121 Toll-free
(505) 892-6243 Fax
Web:				
www.lectrosonics.com		
E-mail:
sales@lectrosonics.com
Lectrosonics Canada:
Mailing Address:		
49 Spadina Avenue,
Suite 303A
Toronto, Ontario M5V 2J1
Rio Rancho, NM
Telephone:			
(416) 596-2202
(877) 753-2876 Toll-free
(877-7LECTRO)
(416) 596-6648 Fax
E-mail:
Sales:   colinb@lectrosonics.com
Service:   joeb@lectrosonics.com
19
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.
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.com
8 April 2008

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