UT300 FREQUENCY-AGILE HAND-HELD TRANSMITTER EURO MODEL WITH VARI-MIC CAPSULE OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. www.lectrosonics.
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Frequency Agile Handheld Transmitter, Euro Model INTRODUCTION Thank you for selecting the Lectrosonics UT300 hand-held wireless transmitter. The UT combines over 80 years of engineering experience with the very latest compo nents in a design that addresses the most demanding professional applications. The design of the UT300 was the direct result of numerous conversations with users, staging and touring companies and dealers across the US.
GENERAL TECHNICAL DESCRIPTION The UT300 transmitters are comprised of a number of functional sub-systems as shown in the block diagram below. GENERAL The 300 system uses 50kHz wide deviation for an extremely high signal to noise ratio. The transmitter circuits are all regulated to allow full output power from the beginning (9 Volts) to the end (7 Volts) of battery life. The input amplifier uses a Motorola 33078 op amp for ultra low noise operation.
Frequency Agile Handheld Transmitter, Euro Model PILOT TONE SQUELCH The 300 system utilizes an ultrasonic tone modulation of the carrier to operate the receiver squelch. This “pilot tone” consists of a 32kHz signal mixed with the audio signal following the microphone preamp, just after the compandor, to control the audio output muting of the receiver.
CONTROLS AND FUNCTIONS EXTERNAL “P” SWITCH – POWER ON/OFF A slide switch which turns battery power on and off. The LED next to the switch lights up when the “P” switch is turned on. This LED also serves as a battery condition indicator. The LED will glow brightly when the battery is good and will dim as the battery condition deteriorates. The LED is at full brightness with a new battery. When the battery voltage reaches 7 Volts, the LED will be completely dark.
Frequency Agile Handheld Transmitter, Euro Model ADJUSTING THE TRANSMITTER FREQUENCY To change frequencies, remove the cover door on the side of the transmitter using your fingernails to expose two rotary switches. The switch nearest the windscreen changes the operating frequency in FINE increments. The switch farthest from the windscreen makes changes in COARSE increments.
Internal Controls - VariMic Version Caution - Due to the high RF levels surrounding the transmitter, the sound of the Varimic capsule may be temporarily affected if the metal windscreen is not in place. Always make the final decision about sound balance and quality with the windscreen in place. The VariMic head includes adjustments for Bass, Midrange and Treble response, and for an attenuation adjustment to provide up to 15dB of additional headroom if needed.
Frequency Agile Handheld Transmitter, Euro Model too late. To solve this problem, the VariMic has a low frequency filter that is so sharp that it can remove low frequency noise without affecting any wanted vocals. It consists of a 36 dB per octave filter circuit to sharply remove low fre quency noise below 75 Hz without affecting vocal fundamentals. The lowest operatic bass voice fundamental is 82 Hz.
BATTERY INSTALLATION The transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY ALKALINE or LITHIUM batteries for reliable operation. Alkaline batteries will provide about 8 hours of operation while the lithium batteries will operate the transmitter for 18 to 20 hours. The battery status lamp will function normally only with alkaline or lithium batteries. Standard zinc-carbon batteries marked “heavy duty” or “long-lasting” are not adequate.
Frequency Agile Handheld Transmitter, Euro Model OPERATING INSTRUCTIONS 1) Install a fresh battery according to the instructions. Leave the battery cover off for further adjustment. 2) Set the internal bypass slide switches so that the battery status LED and the bottom panel switches will operate. 3) On the bottom panel, move the “A” (audio) switch to “OFF” (away from the LED) and the “P” (power) switch to ON (toward the LED) in that order. Observe that the battery status LED is brightly lit.
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) External LED is turned off. Check internal slide switch. 2) Battery is inserted backwards. 3) 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.
Frequency Agile Handheld Transmitter, Euro Model SPECIFICATIONS Operating Frequencies: 537.6 to 862.0 MHz in 26.5MHz blocks RF Power Output: 10mW Pilot Tone: 32.765 kHz, ±2 Hz, 5kHz deviation Frequency Stability: ±0.
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.
