Table Of Contents - Lectrosonics LM Operating Instructions Manual

Thank you for selecting the Lectrosonics LM frequency agile, belt-pack transmitter.
The design of the LM introduces the advanced technology and features of a classic Lectrosonics belt-
pack transmitter at a moderate cost. The unit is designed around the Digital Hybrid Wireless
system (US Patent Pending) which combines a digital audio chain with an analog FM radio link. This
digital process eliminates the compandor and it's problems, yet preserves the extended operating
range of the finest analog wireless systems.
The LM also preserves your investment. The transmitter can emulate the compandor found in 100,
200 and IFB Series Lectrosonics receivers, and certain receivers from other manufacturers. (Call
Lectrosonics for more details.) Changing the compatibility mode is accomplished with a simple
procedure that does not require opening the unit.
The mechanical assembly is a rugged, machined aluminum package with a removable, stainless steel
wire belt clip. The input jack is a standard Lectrosonics 5-pin type for use with electret lavalier mics,
dynamic mics and line level signals. LEDs are provided on the LM front panel to make quick and
accurate level settings without having to view the receiver. The battery compartment accepts any 9
volt battery (alkaline or lithium recommended) and makes a positive connection via self-adjusting
contacts. The antenna is a super-rugged, permanently attached 1/4 wavelength design made of
flexible galvanized steel cable.
Only the LM transmitter is covered in this manual. Companion receivers are covered in separate
manuals.
GENERAL TECHNICAL DESCRIPTION .......................................................................... 4
INTRODUCTION ........................................................................................................... 4
DIGITAL HYBRID TECHNOLOGY ................................................................................ 4
INPUT LIMITER ............................................................................................................ 5
NO PRE-EMPHASIS/DE-EMPHASIS ........................................................................... 5
PILOT TONE SQUELCH .............................................................................................. 5
WIDE-BAND DEVIATION .............................................................................................. 5
LONG BATTERY LIFE ................................................................................................... 5
FREQUENCY AGILITY ................................................................................................. 5
ANTENNA ..................................................................................................................... 5
CONTROLS AND FUNCTIONS ........................................................................................ 6
MIC ................................................................................................................................ 6
POWER ON/OFF SWITCH ........................................................................................... 6
POWER LED ................................................................................................................. 6
FREQUENCY SELECT SWITCHES ............................................................................. 6
MODULATION LEDS .................................................................................................... 7
AUDIO LEVEL ............................................................................................................... 7
ANTENNA ..................................................................................................................... 7
THE BELT CLIP ............................................................................................................. 7
BATTERY INSTALLATION ................................................................................................. 7
OPERATING INSTRUCTIONS .......................................................................................... 8
SELECTING COMPATIBILITY MODE .......................................................................... 8
ATTACHING A MICROPHONE AND ADJUSTING AUDIO LEVELS ............................ 8
OPERATING NOTES ......................................................................................................... 9
ADJUSTING THE TRANSMITTER FREQUENCY ........................................................... 9
5-PIN INPUT JACK WIRING ........................................................................................... 10
RF BYPASSING .......................................................................................................... 10
LINE LEVEL SIGNALS ................................................................................................ 11
WIRING HOOKUPS FOR DIFFERENT SOURCES ................................................... 11
TROUBLESHOOTING ..................................................................................................... 12
SPECIFICATIONS AND FEATURES .............................................................................. 13
SERVICE AND REPAIR .................................................................................................. 14
RETURNING UNITS FOR REPAIR ................................................................................ 14
LIMITED ONE YEAR WARRANTY ................................................................................. 16
The LM transmitter is FCC type accepted under Part 74: 536-608 MHz and 614-806 MHz
Frequency Agile UHF Belt-Pack Transmitter

TABLE OF CONTENTS

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