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Summary of Contents for Lectrosonics MM400
- Page 1 MM200/MM400 FREQUENCY-AGILE UHF MINIATURE BELT-PACK TRANSMITTER OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.com...
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Page 2: Table Of Contents
RETURNING UNITS FOR REPAIR ..............12 WARRANTY ..................Back cover The MM400 transmitter is FCC type accepted under Part 74: 536-608 MHz and 614-806 MHz WARNING! TO PREVENT INTERNAL CORROSION! If the transmitter is wet (either due to immersion or high levels of perspiration), BEFORE opening any covers or connectors, carefully blot the transmitter dry with a clean paper towel or cloth. -
Page 3: Introduction
If you have a miniature transmitter marked as a MM200 transmitter, this is a factory programmed variant of the MM400 that uses the Digital Signal Processor in the MM400 to model the dual band compander used in the 200 series with the appropriate compander time constants and frequency division. Since the signals are converted from analog to digital, processed and then converted back to analog, there is a delay as with all digital audio systems. -
Page 4: Digital Hybrid Technology
The Lectrosonics Digital Hybrid 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 information via an analog FM wireless link. -
Page 5: Pilot Tone Squelch
RF signal is present on the carrier frequency of the system. The MM400 extends this concept even farther by insuring that all transmitters in a system have different pilot tone frequencies so that even spurious RF from the wrong transmitters can’t open the receiver squelch. -
Page 6: Controls And Functions
A NiMh battery will give little or no warning when it is depleted. If you wish to use NiMh batteries in the MM400, we recommend trying fully charged batteries in the unit, noting the length of time that the batteries will run the unit and in the future use somewhat less than that time to determine when the battery needs to be replaced. -
Page 7: Modulation Leds
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”... -
Page 8: Battery Installation
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 but 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. -
Page 9: Adjusting The Transmitter Frequency
Leaded capacitors: P/N 15117 Leadless capacitors: P/N SCC330P All Lectrosonics lavalier mics are already bypassed and do not need any additional capacitors installed for proper operation. Rio Rancho, NM – USA... -
Page 10: Troubleshooting
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. -
Page 11: Specifications And Features
Frequency Agile UHF Miniature Belt-Pack Transmitter SPECIFICATIONS AND FEATURES Operating frequencies: 537.600 to 607.900 MHz 614.100 to 793.500 MHz Frequency selection: 256 frequencies in 100kHz steps RF Power output: 100 mW (nominal) Pilot tone: 25 to 32 kHz (32.765 kHz on MM200); 5kHz deviation Frequency stability: ±... -
Page 12: Service And Repair
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. - Page 13 Frequency Agile UHF Miniature Belt-Pack Transmitter This page intentionally blank. Rio Rancho, NM – USA...
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Page 14: Warranty
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.
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