INSTRUCTION MANUAL UM400a Frequency Synthesized 100 mW UHF Belt-Pack Transmitter Featuring Digital Hybrid Wireless™ Technology Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
UM400a LECTROSONICS, INC.
Frequency Synthesized UHF Belt-Pack Transmitter Table of Contents General Technical Description...............................................................................................................................................................4 Introduction............................................................................................................................................................................................4 Digital Hybrid Technology............................
UM400a General Technical Description Introduction The UM400a transmitter combines 100 mW of RF output with +/- 75 kHz wide deviation for extended operating range and extremely high signal to noise ratio. These key design features are coupled with the compandor-free Digital Hybrid Wireless® audio chain and packaged in the widely recognized Lectrosonics standard transmitter housing.
Frequency Synthesized UHF Belt-Pack Transmitter No Pre-Emphasis/De-Emphasis The signal to noise ratio of the hybrid system is high enough to preclude the need for conventional pre-emphasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver.
UM400a Controls and Functions Input Jack Power LED Power ON/OFF Switch Low Frequency Roll Off Control AUDIO LEVEL Control Modulation LEDs ANTENNA Jack 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 1.6M 100K Frequency Select Switches Input Jack The input on the UM400a accommodates virtually every lavaliere, hand-held or shotgun microphone available. Different line level signals can also be accommodated. (See Wiring Hookups for Different Sources.
Frequency Synthesized UHF Belt-Pack Transmitter Modulation LEDs Adjustable Low Frequency Roll-Off The Modulation LEDs provide a visual indication of the input audio signal level from the microphone. These two bicolor LEDs can glow either red or green to indicate modulation levels.
UM400a Battery Installation Operating Instructions To open the battery compartment, press outward on the cover door in the direction of the arrow as shown in the illustration. Only firm, sliding pressure is needed to open and close the battery door. Swing the door open and take note of the polarity marked inside showing the location of the positive (+) and negative (-) terminals. You can also see the large and small contact holes inside the battery compartment with the door open.
Frequency Synthesized UHF Belt-Pack Transmitter Attaching a Microphone and Adjusting Gain 1) Ensure the battery is in good condition. 2) Insert the microphone plug into the input jack, aligning the pins; be sure that the connector locks. 3) Attach the antenna to the SMA connector on the top of the transmitter. 4) Mute the associated receiver’s audio output. 5) Turn on the transmitter. 6) Position the microphone in the location you will use in actual operation.
UM400a 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 Synthesized UHF Belt-Pack Transmitter Microphone Cord Termination Caution: When wiring the connector, do not use the connector body for any electrical connections. A common mistake is to use the connector body as an audio ground. The connector body is already used as an RF ground on VHF models and no other use is permitted. TA5F Connector Assembly Mic Cord Stripping Instructions NOTE: This termination is required on VHF transmitters and will still work fine on UHF transmitters.
UM400a Microphone RF Bypassing 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. If the electret microphone is not designed properly for use with wireless transmitters, it may be necessary to install a chip capacitor in the mic capsule or connector to block the RF from entering the electret capsule.
Frequency Synthesized UHF Belt-Pack Transmitter 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.
UM400a Replacement Parts and Accessories Item Model/Part Number Replacement wire belt clip Lectrosonics #BCWire Replacment whip antenna Lectrosonics AMM (xx) - specify frequency block (xx) UHF Transmitter Antenna Specifications All Lectrosonic UHF transmitter antennas follow the color code specifications in the chart below to identify operating frequency block range. (The frequency block range is engraved on the ouside housing for each individual transmitter.
Frequency Synthesized UHF Belt-Pack Transmitter 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. NO TRANSMITTER MODULATION LEDs 1) 2) 3) 4) Gain control turned all the way down. Battery is in backwards. Check power LED.
UM400a 16 LECTROSONICS, INC.
Frequency Synthesized UHF Belt-Pack Transmitter Specifications and Features Operating frequencies: Frequency selection: RF Power output: Pilot tone: Frequency stability: Deviation: Spurious radiation: Equivalent input noise: Input level: Input impedance: Dynamic mic: Electret lavaliere: Line level: Input compressor: Gain control range: Modulation indicators: Low frequency roll-off: Audio frequency response (overall system): Controls: Audio Input Jack
UM400a 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 Synthesized UHF Belt-Pack Transmitter Rio Rancho, NM 19
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.
