Related Manuals for Lectrosonics UM300B
Summary of Contents for Lectrosonics UM300B
- Page 1 UM300B FREQUENCY-AGILE UHF BELT-PACK TRANSMITTER EURO MODEL OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC. www.lectrosonics.com 0885...
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Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ....................3 GENERAL TECHNICAL DESCRIPTION ............. 4 CONTROLS AND FUNCTIONS ................6 BATTERY INSTALLATION ..................8 OPERATING INSTRUCTIONS ................8 OPERATING NOTES ..................... 9 ADJUSTING THE TRANSMITTER FREQUENCY ..........9 MICROPHONE CORD TERMINATION .............. 10 5-PIN INPUT JACK WIRING ................11 A6U UHF ANTENNA ................... -
Page 3: Introduction
US. The specific concerns and needs brought up in these conversations led directly to the develop ment of the operational features offered on the UM300B. Up to two hundred fifty six frequencies are user selectable to alleviate interference problems in travelling venues, and the low frequency roll-off is user adjustable to adapt to varying acoustic environments and preferences. -
Page 4: General Technical Description
GENERAL TECHNICAL DESCRIPTION The UM300B 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 (6.5 Volts) of battery life. - Page 5 At UHF frequencies, where wavelengths and antennas are shorter than at VHF frequencies, a resonant length wire is preferred over using the microphone cable as the antenna. The antenna on the UM300B consists of a flexible 1/4 wavelength bronze cable, detachable via an SMA connector. The impedance of this connector is 50 Ohms.
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Page 6: Controls And Functions
LF ROLL OFF INPUT JACK The input on the UM300B accommodates virtually every lavalier, hand-held or shotgun microphone available. Line level signals can also be accommodated. Use a Switchcraft TA5F connector on the cord. See the separate sheet titled “Transmitter 5-Pin Input Jack Wiring” regarding the correct connections for various microphones, and other sources. - Page 7 USE ONLY THE SCREW THAT IS SUPPLIED The circuitry is tightly packed into this unit. A longer screw will permanently damage the transmitter! Use only Lectrosonics PN:28528 which is a Phillips head, 4-40 x 3/16", FL100 screw. Rio Rancho, NM – USA...
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Page 8: Battery Installation
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 9: Operating Notes
Frequency Agile UHF Belt-Pack Transmitter 6) Position the microphone in the location you will use in actual operation. 7) While speaking or singing at the same voice level that will actually be used, observe the MODULATION LEDs. Adjust the AUDIO LEVEL control knob until the LEDs begin to light. Start at a low setting where neither LED lights as you speak. -
Page 10: Microphone Cord Termination
MICROPHONE CORD TERMINATION TA5F Connector Assembly VIEW FROM SOLDER SIDE OF PINS 0.15" Heatshrink Tubing 0.3" Mic Cord Stripping Instructions Caution! Do not allow the shield wire to touch any metal part of the connector shell. The shield wire is the antenna on VHF models and poor operating range will result. -
Page 11: 5-Pin Input Jack Wiring
UHF Transmitter Equivalent Input Circuit VHF transmitters use the shield of the microphone cord as the antenna. The UM300B uses a 1/4 wave flexible wire to radiate the RF signal. There is really not much difference between these two approaches, with respect to the effect of the RF on the microphone capsule. - Page 12 Leaded capacitors: P/N 15117 Leadless capacitors: P/N SCC330P All Lectrosonics lavalier mics are already bypassed and do not need any additional capacitors installed for proper operation. BODY GROUND 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.
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Page 13: A6U Uhf Antenna
Frequency Agile UHF Belt-Pack Transmitter A6U UHF ANTENNA This is a full size cutting template. Lay the actual antenna on top of this drawing and cut at the mark for the desired frequency group. Install cap on end of antenna after cutting to length. -
Page 14: Troubleshooting
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. -
Page 15: Specifications And Features
1996 and I ETS 300 422 (December 1995). A copy of the Declaration of Conformity may be requested from your dealer or by contacting the factory directly: Lectrosonics, Inc. Marketing Department 581 Laser Rd. NE, Rio Rancho, NM 87124 USA tel: 505-892-4501 fax: 505-892-6243 e-mail: marketing@lectrosonics.com Rio Rancho, NM – USA... -
Page 16: Service And Repair
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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