INSTRUCTION MANUAL UM400 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.
UM400 LECTROSONICS, INC.
Frequency-Agile UHF Belt-Pack Transmitter Thank you for selecting the Lectrosonics UM400 fre quency agile, belt-pack transmitter. The UM400 com bines over 80 years of engineering experience with the very latest components, in a design that addresses the most demanding professional applications. The design of the UM400 was the direct result of nu merous conversations with users, staging and touring companies and dealers across the US.
UM400 LECTROSONICS, INC.
Frequency-Agile UHF Belt-Pack Transmitter Table of Contents General Technical Description ..............................................................................................................................................................6 Introduction ...........................................................................................................................................................................................6 Digital Hybrid Technology .................................
UM400 General Technical Description Introduction The 400 system uses 75 kHz wide deviation for an ex tremely high signal to noise ratio. The switching power supplies provide constant voltages to the transmitter circuits from the beginning (9.3 Volts) to the end (5.5 Volts) of battery life. The input amplifier uses an ultra low noise op amp for quiet operation.
Frequency-Agile UHF Belt-Pack Transmitter No Pre-Emphasis/De-Emphasis The signal to noise ratio of the 400 system is high enough to preclude the need for conventional pre-em phasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver.
UM400 Controls and Functions Input Jack Power LED Low Frequency Roll Off Control Power ON/OFF Switch 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 UM400 accommodates virtually every lavaliere, hand-held or shotgun microphone available. Different line level signals can also be accommodated. (See Line Level Signals and Transmitter 5-Pin Input Jack Wiring.
Frequency-Agile UHF Belt-Pack Transmitter Modulation LEDs 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 indi cate modulation levels.
UM400 Battery Installation The transmitter is powered by a standard alkaline or lithium 9 Volt battery. It is important that you use ONLY an ALKA LINE or LITHIUM battery for longest life. Standard zinccarbon batteries marked “heavy-duty” or “long-lasting” are not adequate. Ni-cad rechargeable batteries will only provide 1.5 hours of operation, or less, and will run down quite abruptly. Alkaline batteries provide over 5 hours of operation. Lithium batteries can be used to provide up to 16 hours.
Frequency-Agile 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, align ing 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.
UM400 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 1 4 5 2 3 VIEW FROM SOLDER SIDE OF PINS 0.15" 0.
Frequency-Agile UHF Belt-Pack Transmitter 5-Pin Input Jack Wiring The wiring diagrams shown on the next page represent the basic wiring necessary for the most common types of microphones and other audio inputs. Some micro phones may require extra jumpers or a slight variation on the diagrams shown. sule. Even in transmitters that utilize a “dangling wire,” the microphone is still part of the “ground plane” and is therefore still in the antenna circuit.
UM400 2 WIRE MIC The best RF protection is accomplished by installing RF bypass capacitors at the mic capsule. If this is not pos sible, or if you are still having problems, capacitors can be installed on the mic pins inside the TA5F connector housing. Install the capacitors as follows: Use 330 pF capacitors. Capacitors are available from Lectrosonics. Please specify the part number for the desired lead style.
Frequency-Agile UHF Belt-Pack Transmitter Wiring Hookups for Different Sources 3()%,$ 0). ")!3 7)2% %,%#42%4 -)# 0/3)4)6% ")!3 !5$)/ 3()%,$ 4! & 0,5' 7)2% %,%#42%4 -)# .%'!4)6% ")!3 7)2% %,%#42%4 -)# 0/3)4)6% ")!3 !5$)/ Rio Rancho, NM 3()%,$ 7)2% %,%#42%4 -)# .%'!4)6% ")!3 ")!3 !5$)/ 4! & 0,5' 4! & 0,5' ,).% ,%6%, 2#! OR 0,5' (See notes on “LINE LEVEL SIGNALS” on p.14) $9.!-)# -)# ,%6%, 0).
UM400 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 indi vidual transmitter.
Frequency-Agile 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.
UM400 Specifications and Features Operating frequencies: Frequency selection: RF Power output: Pilot tone: Frequency stability: Deviation: Spurious radiation: Equivalent input noise: Input level: Input impedance: Input compressor: Gain control range: Modulation indicators: Low frequency roll-off: Audio frequency response (overall system): Controls: Audio Input Jack: Antenna: Power Consumption: Battery: Battery Life: Weight: Dimensions: Block 21: 537.600 - 563.100 Block 22: 563.200 - 588.
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 interconnect ing cables and then go through the Troubleshooting section in this manual.
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.
