UT400 DIGITAL-HYBRID FREQUENCY-AGILE HAND-HELD TRANSMITTER OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.
UT400 TABLE OF CONTENTS INTRODUCTION ..................................................................................................... 3 GENERAL TECHNICAL DESCRIPTION ................................................................. 4 CONTROLS AND FUNCTIONS .............................................................................. 6 VARIMIC CONTROLS ............................................................................................. 7 BATTERY INSTALLATION ..................................
Digital-hybrid, Frequency Agile Handheld Transmitter INTRODUCTION Thank you for selecting the Lectrosonics UT400 hand-held wireless transmitter. The UT combines 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 UT400 was the direct result of numerous conversations with users, staging and touring companies and dealers across the US.
UT400 GENERAL TECHNICAL DESCRIPTION GENERAL The 400 system uses 75kHz wide deviation for an extremely 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. It is gain controlled with a wide range dual envelope input compressor which cleanly limits input signal peaks over 30dB above full modulation.
Digital-hybrid, Frequency Agile Handheld 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-emphasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver.
UT400 CONTROLS AND FUNCTIONS “P” SWITCH – POWER ON/OFF Power LED A slide switch (located on the outside bottom of the unit) which turns battery power on and off. The pilot tone muting system prevents “thumps” or transients from occurring even when the switch is turned off or on abruptly, The Power LED glows green when the battery is good and the ON/OFF switch is ON.
Digital-hybrid, Frequency Agile Handheld Transmitter INPUT LIMITER The 400 series transmitters employ a digitally-controlled analog audio limiter just before the analog-to-digital converter. The limiter has a range of more than 30dB 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.
UT400 • Midrange cut sounds very smooth. Almost a “crooner” quality. A sweet sound. • Midrange boost is likely to be useful in a system that is midrange shy. • Treble cut has a “mellow” sound. The capsule has a solid high end so a little cut does not ruin the response. • Treble boost might be fine on some sound systems. The sound doesn’t get harsh (showing that the response was smooth) but sibilants are a little too much. Should be used in moderation.
Digital-hybrid, Frequency Agile Handheld Transmitter BATTERY INSTALLATION The transmitter is powered by a standard alkaline or lithium 9 Volt battery. It is important that you use ONLY ALKALINE or LITHIUM batteries for reliable operation. Alkaline batteries will provide about 4 hours of operation while the lithium batteries will operate the transmitter for over 14 hours. The battery status lamp will function normally only with alkaline or lithium batteries.
UT400 OPERATING INSTRUCTIONS SELECTING THE OPERATING MODE All units with serial number 601 and up are capable of working with Lectrosonics 100 series analog , 200 series analog, 400 series digital hybrid or some other 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.
Digital-hybrid, Frequency Agile Handheld Transmitter OPERATING NOTES The AUDIO LEVEL control knob should not be used to control the volume of your sound system or recorder levels. This gain adjustment matches the transmitter gain with the user’s voice level and microphone positioning. If the audio level is too high — both red LEDs will light frequently or stay lit. This condition may reduce the dynamic range of the audio signal.
UT400 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, or too low to be used. NO TRANSMITTER MOD LEVEL LEDs 1) Gain control turned all the way down. 2) Battery is in backwards. Check power LED. 3) Mic capsule is damaged or malfunctioning.
Digital-hybrid, Frequency Agile Handheld Transmitter SPECIFICATIONS Operating frequencies: 537.600 to 607.900 MHz 614.100 to 793.500 MHz Frequency selection: 256 frequencies in 100kHz steps RF Power output: 100 mW (nominal) Pilot tone: 25 to 32 kHz frequency; 5kHz deviation Frequency stability: ± 0.002% Deviation: ± 75 kHz (max) Spurious radiation: 90 dB below carrier Equivalent input noise: –120 dBV, A-weighted Input level: Nominal 2 mV to 300 mV, before limiting.
UT400 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 out the interconnecting cords and then go through the TROUBLE SHOOTING section in the 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.
LIMITEDONE ONE YEAR LIMITED YEARWARRANTY 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.
