INSTRUCTION MANUAL LMa Frequency-Agile UHF Belt-Pack Transmitter 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 Table of Contents Introduction..............................................................................................................................................................................................4 Digital Hybrid Technology ..................................................................................................................................................................4 Frequency Agility............................................................................
Frequency-Agile UHF Belt-Pack Transmitter Introduction Thank you for selecting the Lectrosonics LM or IM frequency agile, belt-pack transmitter. The design of these transmitters introduces at a moderate 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.
LM/IM Servo Input No Pre-Emphasis/De-Emphasis The LMA input is a radically different input system compared to previous Lectrosonics transmitter microphone inputs. It is so superior that this input system will eventually be utilized by all Lectrosonics UHF transmitters. The improvements are audible and make the transmitters easier to use and much harder to overload.
Frequency-Agile UHF Belt-Pack Transmitter Controls and Functions Input Jack The 5-pin (Switchcraft TA5F compatible) input accommodates 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.
LM/IM 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. The battery status circuitry is designed for the voltage drop over the life of alkaline batteries.
Frequency-Agile UHF Belt-Pack Transmitter Operating Instructions Selecting the Compatibility Mode All units with serial number 601 (101 for IM) 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.
LM/IM Adjusting the Transmitter Frequency Frequency Select Switches Input Jack AUDIO LEVEL Control 1.6M 100K E D C B A F 0 1 9 8 7 2 6 3 4 5 E D C B A F 0 1 9 8 7 2 6 3 4 5 -20 LED -10 LED If you are experiencing 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 on the left side of the transmitter case.
Frequency-Agile UHF Belt-Pack Transmitter 5-Pin Input Jack Wiring The wiring diagrams included in this section represent the basic wiring necessary for the most common types of microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the diagrams shown. The best RF protection is accomplished by installing bypass capacitors at the mic capsule.
LM/IM Wiring Hookups for Different Sources In addition to the wiring hookups illustrated below, Lectrosonics makes a number of cables and adapters for other situations such as connecting musical instruments (guitars, bass guitars, etc.) to the transmitter. These cables can be found in our UHF or Accessories catalogs. Visit www.lectrosonics.com, or contact the factory for more information. In the LMA Series, there is a new input circuit where pin 4 is now a voltage selector pin.
Frequency-Agile UHF Belt-Pack Transmitter Wiring Diagram for MI33A Instrument Cable The MI33ARA and MI33AST instrument cable assemblies allow an optimum match between musical instrument pickups and Lectrosonics transmitters with 5-pin input connectors. Note: This cable is prewired and cannot be field modified. The cable is available in two configurations, MI33ARA (right angle) and MI33AST (straight). The active preamp and low noise wire cable provide a “same as wire” experience in a wireless environment.
LM/IM Troubleshooting It is important that you follow these steps in the sequence listed. Symptom: Possible Cause: Transmitter Battery LED off when Power Switch “ON” 1. Battery is inserted backwards. 2. Battery is dead. No Transmitter Modulation LEDs when Signal Should be Present 1. 2. 3. 4. 5. 6. Gain control turned all the way down. Battery is in backwards. Check power LED. Mic capsule is damaged or malfunctioning. Mic cable damaged or miswired.
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 interconnecting 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
LM/IM 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.
