MM400c Manual - Lectrosonics.com
Contents
1. The 20 and 10 LEDs will blink simultaneously e Once for 100 Series mode e Two times for 200 Series mode e Three times for Other receivers e Four times for 400 Series mode e 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 ex pose the Frequency Select Switches With a small screwdriver included with your unit set the Frequency Select Switches to CC for Change Change 5 Power up the unit briefly just long enough to watch the LED s glow and then turn the transmitter off Modulation LED s POWER LED Power ON OFF Switch Rio Rancho NM 6 Change the Frequency Select Switch settings to one of the following positions e 100 Series mode 1 1 e 200 Series mode 2 2 e Mode 3 3 3 e 400 Series mode 4 4 e IFB Series mode 5 5 7 Power up the unit briefly just long enough to watch the LED s glow and then turn the transmitter Off 8 Setthe Frequencv Select Switches to 0 0 9 Turnon the transmitter and observe the Modula tion LEDs to verifv the compatibilitv 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 experiencing2. 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 batter ies 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 bat tery status using the Battery Timer function available in a number of Lectrosonics receivers Refer to your receiver manual to determine if this function is avail able Alkaline batteries provide about 1 75 hours of Battery Compartment 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 Note Standard zinc carbon batteries marked heavy duty or long lasting are not adequate To access the battery compartment unscrew
3. 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 transmi ter first Screw the Battery Compartment Cover back into the transmitter body If the battery is inserted in correctly the cover will not screw in easily and the unit will not work 16 LECTROSONIGS INC Model Description 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 receiv er 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
4. have a good battery in the transmitter It is important that you follow these steps in the sequence listed SYMPTOM TRANSMITTER PWR LED OFF NO TRANSMITTER MODULATION LEDs 10 MODULATION LED IS BLINKING GREEN AND RECEIVER HAS NO AUDIO RECEIVER INDICATES NO RF NO SOUND OR LOW SOUND LEVEL RECEIVER INDICATES PROPER AUDIO MODULATION DISTORTED SOUND HISS AND NOISE AUDIBLE DROPOUTS EXCESSIVE FEEDBACK Rio Rancho NM POSSIBLE CUASE 1 Battery is inserted backwards 2 Battery is dead 3 Power ON OFF switch configured to Normal Mode and is set to OFF 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 the switch is in the OFF or mute position See Controls and Functions 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 Operating range is too great 1 Receiver output level set too low 2 Receiver output is disconnected cable is defective or connectors not wired correctly 3 Sound system or recorder input is turned down 4 Receiver Transmitter compatibility mode mismatched 5 Transmitter audio muted 1 Transmitter gain audio level is f
5. indicates full modulation and is the optimum setting for the transmitter s gain 20 LED O Off G Green Green 10 LED O Off O Off Green Signal Level Less than 20 dB 20 dB to 10 dB 10 dB to 0 dB Green Red Red 6 Red 0 dB to 10 dB Greater than 10 db 12 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 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 Modulation LED s POWER LED Power ON OFF Switch Microphone Jack audio Level Control LECTROSONIGS INC Model Description Power Switch Function Selection The Power ON OFF Switch can also be used as an au dio 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 i
6. lithium grease to the area before inserting the new magnet as sembly Place switch in center position so tabs will clear the opening gently pry switch out 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 2 Notice that the Magnet Housing Assembly Slot has a wide spot in the middle Place the new Mag net 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 Magnet Housing Assembly 14 LECTROSONIGS INC Model Description 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 If the mic is wired as directed and you are having difficulty with level high noise or poor frequency re sponse 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 con nector housing Install the capacitors as follows Use 330
7. pF ca pacitors Capacitors are available from Lectrosonics Please specify the part number for the desired lead style Microphone RF Bypassing Rio Rancho NM 2 WIRE MIC Preferred locations for bypass capacitors a CAPSULE TASF CONNECTOR Alternate locations 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 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 Lay the transmitter on this template to determine the frequency block of the antenna Remove the colored cap for accurate measurement hi Len gth cl een 470 MD et g 2 e 9 SS bg II II A QA 2 All Lectrosonic UHF transmitter antennas follow the color code specifications in the chart below to identify op erating frequency block range The frequency block range is labeled on the ouside housing for each individual transmitter BLOCK FREQUENCY CAP SLEEVE ANTENNA RANGE COLOR WHIP LENGTH 16 LECTROSONIGS INC Model Description Troubleshooting Before going through the following chart be sure that you
8. 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 mod est 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
9. 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 reconfig ured by the user Power LED The PWR LED provides an indication of the battery s condition The PWR LED glows green when the bat tery is good The color changes to red when there is about 30 minutes of operation left with the recom mended 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
10. unit but will soon discharge to the point where the LED will blink red or shut off completely LECTROSONICS INC Model Description Mic Jack The Mic Jack is a 2 5 mm microplug that is wired to ac commodate 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 WPMC 10 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 6V Mic Bias gt To Mic Amp Audio Level 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 20 LED 10 LED Less than 20 dB O Off O Off 20 dB to 10 dB Green Off 10 dB to 0 dB e Green e Green 0 dB to 10 dB Red e Green Greater than 10db Red e Red When the Power ON OFF Switch is configured for Au dio Mute Mode the 10 Modulation LED is also used to indicate if the transmitter is in an audio muted or an unmuted
11. 256 available carrier frequencies to prevent the pilot tone from being transferred to the wrong receiver via an intermodulation product Rio Rancho NM Wide 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 100mW of power output makes a significant improve ment in signal to noise ratio and maximum operat ing 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 al low5 5 hours of operation using a single AA lithium battery An alkaline AA battery will provide about 1 5 hours and a 2500 mAh NiMH AA battery will provide about 4 5 hours of operating time The battery con tacts 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 under a wa terproof cover on the bottom of the unit provide 256 frequencies in 100 kHz steps over a 25 5 MHz range Circulator I
12. INSTRUCTION MANUAL MM400C Watertight Miniature UHF Belt Pack Transmitter Featuring Digital Hybrid Wireless Technology US Patent 7 225 135 Fill in for your records Serial Number LECTROSONICS Rio Rancho NM USA Purchase Date www lectrosonics com MM400C 2 LECTROSONIGS INC Model Description Thank you for selecting the Lectrosonics MM400Cwa tertight miniature transmitter The unique design pro vides several distinct features for professional applica tions e Outstanding RF operating range e Superb audio quality e Ultra lightweight corrosion resistant housing e Watertight seals for use in wet environments e Programmable emulation modes for maximum versatility The patented Digital Hybrid Wireless design combines 24 bit digital audio with analog FM techniques to pro vide 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 Rio Rancho NM The input provides 6 VDC bias voltage for use with modern electret lavaliere microphones Multi col orLEDs are provided to make input gain adjustments quick and accurate without having to view the receiver The battery compartment accepts AA alkali
13. MI ANN r S 14 September 2015 LECTROSONICS INC
14. Processor Power gt 1 8v Supply LC 6y c 3v plug 850 Limit imi SS A LV S ii NI 4 H 1 Microprocessor Bicolor O AA Lithium a Bicolor Power LED Modulation LEDs 11 3 MHz DH Reference TT a Freq Switches Phase Locked Loop Oscillator 11 3 MHz Ht Reference TT Voltage 50 Isolator Controlled Ohm LECTROSONICS INC Model Description 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 at tack and release limiter followed by a slow attack and release limiter The limiter recovers quickly from brief transients so that its action is hidden from the listener but recovers slowly from sustained high levels to keep audio distortion low and preserve short term dynamic changes Two bicolor LEDs indicate limiter activity See Operat ing Instructions Adjusting Audio Levels Generally speaking some limiting is desirable in normal opera tion to improve the signal to noise ratio of the system The limiting action is not audible a
15. ar too high Check Modulation LEDs on transmitter and receiver as it is being used See Operating Instructions Attaching a Microphone and Adjusting Audio Levels 2 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 trequency select switches on receiver and transmitter match 5 Receiver Transmitter compatibility mode mismatched 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 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 12 MM400C Specifications and Features Operating frequencies lock lock lock lock ock ock D OD D D D w lock lock lock lock lock ock Frequency Selection RF Power output Pilot tone B B B B B B Frequency stability Deviation Spurious radiation Equivalent input noise Input level Input impedance Input limiter Gain control range Modulation indicators Low frequency roll off The FCC requires that the following statement be inc
16. ches 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 se quence 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 Nor mal 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 10Modulation LED blinks green 14 MM400C Replacing the Power Switch Magnet Housing Assembly Although the Power Switch s Magnet Housing As sembly 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 Because of this color the screwdriver blade or ange 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
17. 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 Frequency Select Switches 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 ad justs 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 1 6 100K 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
18. e 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 inthe audio section with the 3 dB point at 70 Hz The actual roll off frequency will vary somewhat accord ingto the low frequency response of the mic capsule beingused 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 In sound reinforcement systems as another instance excessive low frequency content can cause excessive power am plifier drain or even damage to loudspeaker systems Mic Jack J Supply A D Converter do O 11001001 MM400C Block Diagram Encoded A Audio Converter Pilot Tone ks 11001001 Fits Switchcraft J 3 3v L Switching gt 3V Digital Signal
19. fect 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 WWMM This warranty gives you specific legal rights You may have additional legal rights which vary from state to state LILO VN LECTROSONICS 20 4 581 Laser Road NE e Rio Rancho NM 87124 USA e www lectrosonics com 505 892 4501 e 800 821 1121 e fax 505 892 6243 e sales Olectrosonics com OU l W
20. 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 6 100K Frequency Select Switches 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 fre quency 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 transmit ter to ensure the RF signal is strongly indicated at the receiver 14 MM 400C 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 transm
21. itter and observe the RF LED on the front pa nel 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 Attaching a Microphone Th ity Adjusting Audio Levels e front panel Modulation LEDs indicate limiter activ See chart Since the distortion introduced by the limiter is minimal and full modulation is assured occa sional forays into the red by the 10 LED is acceptable 1 2 3 4 5 6 Install a fresh battery 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 Mute the main sound system and rotate the Audio Level Control on the MM400C to maximum coun terclockwise Off Set the Power ON OFF switch to the ON position Position the microphone in the location where it will be used during in actual operation Observe the MM400C Modulation LEDS whil espeaking 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
22. luded in this manual 470 470 100 495 600 19 486 400 511 900 20 512 000 537 500 21 537 600 563 100 22 563 200 588 700 23 588 800 607 900 and 614 100 614 300 24 614 400 639 900 25 640 000 665 500 26 665 600 691 100 27 691 200 716 700 28 716 800 742 300 29 742 400 767 900 256 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 gt 30 dB range 43 dB semi log rotary control Dual bicolor LEDs indicate modulation of 20 10 0 10 dB referenced to ful modulation 12 dB octave 70 Hz Controls Audio Frequency Response Signal to Noise Ratio dB overall system 400 Series mode Note the dual envelope soft good handling of transients using variable 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 attack and release time constants The gradual onset of limiting in the design begins below fullmodulation which reduces the measured figure for SNR witho
23. n 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 Mode Mutes Audio 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 ON OFF 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 Disconnect the microphone from the transmitterin put 2 If the transmitter is turned off set the Power Switch ON and observe the Modulation LEDs 3 After the power up sequence completes place the POWER ON OFF switch in the OFF position and observe the 10 Modulation LED 4 Ifthe 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 Rio Rancho NM 1 6 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 Retain ing 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 Swit
24. nd 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 selected Compatibility Mode Microprocessor PLL and VCO Circuits An 8 bit microprocessor moni tors 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 be compat ible with Lectrosonics 400 Series receivers and will yield the best performance when doing so However due to the flexibility of digital signal processing the unit 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 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
25. ne lithium or NiMH batteries and a detachable antenna wave length 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 func tionality 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 Compat ibility 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 MM400C 4 LECTROSONIGS INC Model Description Table of Contents General Technical Descrtotton A KAAHMAKHM HEI NEEMKAEMHMEMEMENEMENEMANEEMNAZINAEMEEANEEENEEZZEEZNEZI 6 EC 6 Digital Hybrid Wireless Technology 6 Low Frequency Roll Off ii 6 Input un TEE 7 Digital Signal PrO ESSOT EE 7 Microprocessor PLL and VCO Circuits eege dE EE d deed renee Da EENS 7 Compatibility MJES seinnaa asar aeaa naNO II rE aa E EER 7 NI Ate EE H Wide Band Deviationt ilari A EENS E 7 Magnetic Po
26. rtment the Frequency Switch Cover Plate and fully unscrew and remove the microphone con nector 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 PETRO LEUM 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 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 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 con figured for Audio Mute Mode it is still possible to
27. s 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 forquiet 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 and are interchangeable Digital Hybrid Wireless Technology All wireless links suffer from channel noise to some degree and all wireless microphone systems seek tominimize 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 combi nation of power bandwidth and resistance to interfer ence 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 en 5V Bias coded information via an analog FM wireless link This proprietary algorithm is not a digital implementation of an analog compandor but a techniqu
28. 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 dam age 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 87124 USA Web www lectrosonics com Lectrosonics Canada Mailing address Lectrosonics Inc 720 Spadina Ave Suite 600 Toronto Ontario M5 S 2T9 Canada Rio Rancho NM Shipping address Lectrosonics Inc 561 Laser Rd Ste 102 Rio Rancho NM 87124 USA E mail sales lectrosonics com Shipping address Lectrosonics Inc 720 Spadina Ave Suite 600 Toronto Ontario M5 S 2T9 Canada Telephone 505 892 4501 800 821 1121 Toll free 505 892 6243 Fax Telephone 416 596 2202 877 753 2876 Toll free 416 596 6648 Fax 19 MM400C AW 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 u Z Should any de
29. solator 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 which is rarely seen in a wireless microphone transmitter due to its high cost MM400C Controls and Functions Power ON OFF Switch External Switch Magnet Housing Assembly Shown Frequency Select Switch Thumbscrew and Cover Plate Battery Compartment Cap Antenna Microphone Jack Audio Level Control Preventing Internal Gorrosion It is very important that you properly dry the transmit terwhen 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 papertowel 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 Com pa
30. ut limiting limiting limitin by 4 5 dB Total Harmonic Distortion Audio Input Jack Antenna Battery Battery Life Weight Overall Dimensions 0 2 typical 400 Series mode 2 5 mm Microjack matches Switchcraft 850 Microplug Galvanized steel whip 1 5 Volt AA lithium recommended 1 5 hours alkaline 5 5 hours lithium 4 5 hours 2500 mAh NiMH 3 6 ozs 102 grams with lithium battery no antenna 3 03 x 2 x 0 69 inches not including Emission Designator 180KF3E Specifications subject to change without notice 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 Model Description Service and Repair If your system malfunctions you should attempt to correct or isolate the trouble before concluding that the equip ment needs repair Make sure you have followed the setup procedure and operating instructions Check the inter connecting 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 con nection send the unit to the factory for repair and
31. wer ON OFF Switch u 7 E EE 7 Fregvencv e EE 7 Circulator Isolator EE Controls and Functions Preventing Internal COrrosion ii 8 Power ON OFF Switeba EA S a ak ta a 8 Power EDD iii i BE 8 Tele 9 Audio Level srann aae naar 9 ModulationLEDSs ilraii ea a b a i e e B l 9 FREQUENCY Select SWITCheszt url ien iba eb p e a a L a e Se 9 le CEET Belt e e EE Battery Installation Operating Instructions Selecting the Compatibility MOdE ii 11 Adjusting Transmitter e Ce UE 11 Attaching a Microphone and Adjusting Audio LEVEIS nnnnnnrV H E KANA KAEKEE NERI AEINAZKAMNAEZEENEZZEZENAEZZA 12 Power Switch Function Selection ii 13 Determine Power Switch Function Mode L SANA N ANA HE EHEEHMANAANAENAENIENEEMEEZEMNEAMNAZNAZNAZZEZZ 13 Changing Power Switch FUNCHION EE AN A AENEA NAAN ANEANEANEANEENEENEENEENEENEENEENEENEENEENEENAENEENAEEEZEZNEZZ 13 Replacing the Power Switch Magnet Housing Assembhy AE 14 Microphone RF Bypassing iii e a L as p ei 15 Replacement Parts and Accessortes AA 16 UHF Transmitter Antenna Specifications ana nm IF e ti 16 TroublesKkOOtin BEE 17 Specifications and Features iuicarii Aaa 18 NR ia a a a A RAR 19 Retunming HEET ET 19 Rio Rancho NM 5 MM400C General Technical Description General The 400 Series or Digital Hybrid Wireles
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