INSTRUCTION MANUAL LMa Synthesized UHF Belt-Pack Transmitter Featuring Digital Hybrid Wireless® Technology US Patent 7,225,135 Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
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Frequency-Agile UHF Belt-Pack Transmitter Table of Contents Introduction..............................................................................................................................................................................................4 Digital Hybrid Technology .....................................................................................................................................................................4 Frequency Agility.....................................
LMa Introduction The design of the LMa transmitter introduces the advanced technology and features of Digital Hybrid Wireless® in a Lectrosonics belt-pack transmitter at a modest cost. Digital Hybrid Wireless® combines a 24-bit digital audio chain with an analog FM radio link to eliminate a compandor and its artifacts, yet preserve the extended operating range and noise rejection of the finest analog wireless systems.
Frequency-Agile UHF Belt-Pack Transmitter Input Limiter The transmitter employs a digitally-controlled analog audio limiter prior to the analog-to-digital converter. The limiter has a range greater than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, connected as a fast attack and release limiter followed by a slow attack and release limiter.
LMa 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. The pilot tone muting system prevents transient noise (pops, thumps, etc.
Frequency-Agile UHF Belt-Pack Transmitter Battery Installation The transmitter is powered by a standard 9 volt battery. We recommend using alkaline, lithium, or rechargeable LiPolymer 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. LiPolymer batteries will last about 7 hours per charge, and Lithium batteries can provide up to 13 hours.
LMa Operating Instructions Selecting the Compatibility Mode The LMa transmitter is capable of working with Lectrosonics 400 Series Digital Hybrid Wireless®, 200 Series analog, 100 Series 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 the supplied screwdriver and a battery. Frequency Select Switch Settings (C,C) 1.
Frequency-Agile UHF Belt-Pack Transmitter Adjusting the Frequency Frequency Select Switch Settings Input Jack AUDIO LEVEL Control 1.6M E D C B A F 0 1 9 8 7 100K 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 The left switch adjusts the operating frequency of the transmitter up or down in 1.6 MHz steps. The right switch adjusts the operating frequency of the transmitter up or down in 100 kHz steps.
LMa 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. It is virtually impossible to keep completely up to date on changes that other manufacturers make to their products, thus you may encounter a microphone that differs from these instructions.
Frequency-Agile UHF Belt-Pack Transmitter Microphone Cable Termination for Non-Lectrosonics Microphones TA5F Connector Assembly Mic Cord Stripping Instructions 1 4 5 2 3 VIEW FROM SOLDER SIDE OF PINS 0.15" 0.3" Crimping to Shield and Insulation Strip and position the cable so that the clamp can be crimped to contact both the mic cable shield and the insulation. The shield contact reduces noise with some microphones and the insulation clamp increases ruggedness.
LMa Wiring Hookups for Different Sources In addition to the microphone and line level 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. Visit www.lectrosonics.com and click on Accessories, or download the master catalog. A lot of information regarding microphone wiring is also available in the FAQ section of the web site at: http://www.lectrosonics.com/faq.
Frequency-Agile UHF Belt-Pack Transmitter Microphone RF Bypassing Line Level Signals When used on a wireless transmitter, the microphone element is in the proximity of the RF coming from the transmitter. The nature of electret microphones makes them sensitive to RF, which can cause problems with the microphone/transmitter compatibility.
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Frequency-Agile UHF Belt-Pack Transmitter Specifications and Features Operating frequencies: Block 470 470.100 - 495.600 Block 19 486.400 - 511.900 Block 20 512.000 - 537.500 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 (export only) Block 28 716.800 - 742.300 (export only) Block 29 742.400 - 767.
LMa 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 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.
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Frequency-Agile UHF Belt-Pack Transmitter Rio Rancho, NM 19
LMa 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.
