MM400 FREQUENCY-AGILE UHF MINIATURE BELT-PACK TRANSMITTER OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.
MM400 TABLE OF CONTENTS WARNING! TO PREVENT INTERNAL CORROSION! ................................ 2 INTRODUCTION ..................................................................................................... 3 GENERAL TECHNICAL DESCRIPTION ............................................................... 4 CONTROLS AND FUNCTIONS ............................................................................. 6 BATTERY INSTALLATION ...........................................................................
Frequency Agile UHF Miniature Belt-Pack Transmitter INTRODUCTION Thank you for selecting the Lectrosonics MM400 frequency agile UHF miniature transmitter. The MM400 combines over 80 years of engineering experience with the very latest components, in a design that addresses the most demanding profes sional applications. The design of the MM400 was the direct result of numerous conversations with users, staging and touring companies and dealers across the US.
MM400 GENERAL TECHNICAL DESCRIPTION If the unit will be used in a wet environment (possible immersion, perspiration, rain scenes, etc.) – be certain all connectors have intact gaskets and that a properly sealed Lectrosonics waterproof mic connector is installed and used with the microphone. GENERAL The 400 system uses 75kHz 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.
Frequency Agile UHF Miniature Belt-Pack Transmitter NO PRE-EMPHASIS/DE-EMPHASIS The signal to noise ratio of the 400 system is high enough to preclude the need for conventional pre-emphasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver.
MM400 CONTROLS AND FUNCTIONS AUDIO LEVEL ANTENNA MIC JACK ANTENNA AUDIO LEVEL MIC MODULATION LEDs LECTRO Digital Hybrid Wireless MM400 SN: XXXX –10 –20 AA BATTERY POWER POWER LAMP FCCID:DBZMM400 Lectrosonics, Inc. Made in U.S.A U.S. Patent Pending FREQUENCY ADJUST BATTERY COMPARTMENT MIC JACK The Microplug (2.5 mm) input on the transmitter accommodates 2 wire positive bias lavalieres. A waterproof mic connector is available from Lectrosonics as an assembly kit.
Frequency Agile UHF Miniature Belt-Pack Transmitter MODULATION LEDS Indicate the proper setting of the MIC LEVEL control. There are two bicolor modulation LEDs that can light either red or green. “-20dB level” One modulation LED glows green and the transmitter is 20 dB below full modulation. “-10 dB level” Both modulation LEDs glow green and the transmitter is close to full modulation. “+0 dB level” -20 LED glows red and the -10 LED glows green. The transmitter is in slight limiting and is fully modulated.
MM400 BATTERY INSTALLATION The transmitter is powered by a standard lithium, NiMh or alkaline AA 1.5 Volt battery. Standard zinc-carbon batteries marked “heavy-duty” or “long-lasting” will not work. NiMh rechargeable batteries will only provide 2 hours of operation and will run down quite abruptly. Alkaline batteries provide over 2 hours of operation with some warning. Lithium batteries can be used to provide up to 4.5 hours.
Frequency Agile UHF Miniature Belt-Pack Transmitter ADJUSTING THE TRANSMITTER FREQUENCY If you are experiencing interference from another signal on your frequency, F 0 1 F 0 1 E 2 E 2 you may want to change the operating frequency of your system. The left 3 3 D D switch changes the operating frequency by 1.6 MHz per step and the right C C 4 4 switch changes it 100 kHz per step. If you are experiencing interference, 5 B 5 B 6 6 A A change the operating frequency in 100 kHz steps to find a clear channel.
MM400 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 BATTERY LED OFF 1) Battery is inserted backwards. 2) Battery is dead. NO TRANSMITTER MODULATION LEDs 1) Gain control turned all the way down. 2) Battery is in backwards. Check power LED. 3) Mic capsule is damaged or malfunctioning. 4) Mic cable damaged or mis-wired.
Frequency Agile UHF Miniature Belt-Pack Transmitter SPECIFICATIONS AND FEATURES Operating frequencies: 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: Controls: Audio Frequency Response: Audio Input Jack: Antenna: Battery: Battery Life: Weight: Overall Dimensions: 537.600 to 607.900 MHz 614.100 to 793.
MM400 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 out the intercon necting 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.
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LIMITEDONE ONE YEAR LIMITED YEARWARRANTY 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.
