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Summary of Contents for Lectrosonics UT700
- Page 1 UT700 ENCRYPTED DIGITAL UHF HANDHELD TRANSMITTER OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. Rio Rancho, NM www.lectrosonics.com...
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Page 2: Table Of Contents
PVC, machined to a natural, comfortable shape. Internal mechanical parts are machined aluminum and brass. Only the UT700 transmitters are covered in this manual. Companion receivers are covered in separate manuals. The UT700 transmitter is FCC type accepted under Part 74: 470-608MHz and 614-802MHz LECTROSONICS, INC. -
Page 3: General Technical Description
Digital Frequency Agile UHF Hand-held Transmitter GENERAL TECHNICAL DESCRIPTION GENERAL The 700 series encrypted digital wireless microphones use an all-digital communications link for excellent sound quality and data security. In the transmitter, the audio first passes through a DSP-controlled dual envelope analog limiter. The signal is then digitized and fed to a DSP (digital signal processor). - Page 4 IF frequencies, local oscillator and image frequencies of the systems being operated. To eliminate this problem in the UT700, the modulated radio signal passes through a circular isolator before entering the antenna. The circular isolator functions like a “one-way check valve” to allow the RF signal to pass through to the antenna, but not to pass backwards into the amplifier stage.
- Page 5 Digital Frequency Agile UHF Hand-held Transmitter MICROPHONE ELEMENT The UT400 includes the Lectrosonics VariMic mic element. The VariMic is a cardioid condenser back electret microphone that is adapted for the unique circumstances of wireless microphones. The problems it solves are dynamic range, handling noise and low frequency noise (rumble or wind).
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Page 6: Controls And Functions
LED instead of the audio LEDs. LOCKED MODE The UT700 can be placed in a locked mode where neither the power switch nor the frequency switches have any further effect on operation. This protects the unit from... - Page 7 Digital Frequency Agile UHF Hand-held Transmitter HIDING THE POWER LED This unit has no provision for disabling the LEDs. The audio LEDs are covered during normal use but the power LED is exposed. If the light is objectionable, we recommend covering the LED with a piece of tape. FREQUENCY ADJUST Two rotary switches (located under the battery door) adjust the center frequency Coarse...
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Page 8: Varimic Controls
UT700 VARIMIC CONTROLS 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. - Page 9 BASS FILTER In addition to the tone controls, the UT700 also has a built in bass filter. This filter is fixed and cannot be adjusted or defeated. Low frequency noise is much more of a problem with wireless microphones than with conventional micro- phones.
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Page 10: Battery Installation
UT700 BATTERY INSTALLATION The transmitter is powered by a standard alkaline or lithium 9 Volt battery. It is important that you use ONLY an ALKALINE or LITHIUM battery for longest life. Standard zinc-carbon 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. -
Page 11: Operating Instructions
Digital Frequency Agile UHF Hand-held Transmitter OPERATING INSTRUCTIONS ADJUSTING THE GAIN 1) Install a fresh battery. Leave the battery cover off for further adjustment. 2) On the bottom panel, move the “P” (power) switch to ON, toward the LED. Observe that the battery status LED is glowing green indicating a good battery. -
Page 12: Troubleshooting
UT700 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. - Page 13 Digital Frequency Agile UHF Hand-held Transmitter MICROPHONE HAS A “WHINE” NOISE IN 1) Install bypass capacitors at both ends of the mic cable THE BACKGROUND WHICH VARIES AS THE use the factory supplied microphone. MIC CABLE IS MOVED RECEIVER OUTPUTS AN EXTREMELY LOUD, 1) Encryption keys in transmitter and receiver do not match.
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Page 14: Specifications And Features
UT700 SPECIFICATIONS AND FEATURES Operating principle: Proprietary digital modulation with encryption Modulation type: Modified pi/4 DQPSK Sample rate: 44.1 ksps Audio coder: Proprietary sub-band ADPCM Encryption key length: 128 bit (300 trillion trillion trillion keys) Bit rate: 220,500 bps including packet overhead Operating frequencies: 537.600 to 793.500 MHz depending upon local regulations... -
Page 15: Service And Repair
There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS service department is equipped and staffed to quickly repair your equipment. In-warranty repairs are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest flat rate plus parts and shipping. -
Page 16: Warranty
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. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item.
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