INSTRUCTION MANUAL LM/IM Frequency-Agile UHF Belt-Pack Transmitters Featuring Digital Hybrid Wireless™ Technology (US Patent Pending) Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
LM/IM 2 LECTROSONICS, INC.
Frequency-Agile UHF Belt-Pack Transmitter Table of Contents Introduction ............................................................................................................................................................................................ 4 Digital Hybrid Technology ..................................................................................................................................................................... 4 Input Limiter .......................................
LM/IM Introduction Thank you for selecting the Lectrosonics LM or IM frequency agile, belt-pack transmitter. The design of these transmitters introduces at a moder ate cost the advanced technology and features of a Lectrosonics belt-pack transmitter. The design is based on the Digital Hybrid Wireless™ system (US Patent Pending) which combines a digital audio chain with an analog FM radio link.
Frequency-Agile UHF Belt-Pack Transmitter signal is present on the carrier frequency of the system. The 400 Series extends this concept even further 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. Input Limiter The transmitters employ a digitally-controlled analog audio limiter prior to the analog-to-digital converter.
LM/IM Controls and Functions Mic Input Jack The 5-pin (Switchcraft TA5F compatible) input accom modates virtually every lavaliere, hand-held or shotgun microphone available, and most musical instrument signals. Line level signals can also be accommodated. (See 5-Pin Input Jack Wiring.) Power ON/OFF Switch The Power ON/OFF switch turns the transmitter on and off.
Frequency-Agile UHF Belt-Pack Transmitter Battery Installation The transmitter is powered by a standard 9 volt battery. We recommend using alkaline or lithium batteries for longest life. Standard zinc-carbon batteries marked “heavy-duty” or “long-lasting” are not adequate. Alkaline batteries provide over six hours of operation at room temperature. Lithium batteries can provide up to 13 hours and will work at lower temperatures.
LM/IM Operating Instructions Selecting the Compatibility Mode All units with serial number 601 and up are capable of working with Lectrosonics 400 Series Digital Hybrid Wireless™, 200 Series analog, 100 Sseries analog and some non-Lectrosonics analog wireless receivers (contact the factory for details). The transmitter must be set to the operating mode of the matching receiver, which is easily done using only the supplied screwdriver and a battery. Frequency Select Switch Settings (C,C) 1.
Frequency-Agile UHF Belt-Pack Transmitter Adjusting the Transmitter Frequency MIC input jack AUDIO LEVEL Control -20 LED Frequency Select Switches 1.6M E D C B A F 0 1 100K 2 3 4 5 9 8 7 6 E D C B A F 0 1 2 3 4 5 9 8 7 6 -10 LED 4) Set the transmitter Power ON/OFF switch to ON. 5) For microphone users, position the microphone in the location where it will be used in actual opera tion.
LM/IM 5-Pin Input Jack Wiring Input Circuit Note: This section does not apply to the IM transmitter when used as part of the IS400 Instrument System. The cable supplied with the IS400 Insturment System is prewired and cannot be field modified. The cable is available in two configurations, MI33ARA (right angle) and MI33AST (straight).
Frequency-Agile UHF Belt-Pack Transmitter Line Level Signals Note: This section does not apply to the IM transmitter when used as part of the IS400 Instrument System. SHIELD (GND) PIN 1 2 Normal Hookup The normal hookup for line level signals provides 40 dB of attenuation allowing signal levels up to 3 V to be applied without limiting. The normal hookup configura tion can be modified for situations that require higher levels of headroom, or lower levels of attenuation. (See illustration below.
LM/IM Troubleshooting 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. 2. 3. 4. 5. 6. Receiver Indicates RF But No Audio 1. Ensure that the transmitter and receiver Frequency Select Switches are set to the same frequency. 2. Make sure the compatibility mode is the same on transmitter and receiver. 3.
Frequency-Agile UHF Belt-Pack Transmitter Specifications and Features Operating frequencies: Block 21 537.600 - 563.100 Block 22 563.200 - 588.700 Block 23 588.800 - 607.900 and 614.100 - 614.300 Block 24 614.400 - 639.900 Block 25 640.000 - 665.500 Block 26 665.600 - 691.100 Block 27 691.200 - 716.700 Block 28 716.800 - 742.300 Block 29 742.400 - 767.
LM/IM 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 interconnect ing 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.
Frequency-Agile UHF Belt-Pack Transmitter Rio Rancho, NM 15
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.
