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Summary of Contents for Lectrosonics UM400AV
- Page 1 INSTRUCTION MANUAL UM400a Frequency Synthesized 100 mW UHF Belt-Pack Transmitter Featuring Digital Hybrid Wireless Technology ™ Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.com...
- Page 2 UM400a LECTROSONICS, INC.
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Page 3: Table Of Contents
Microphone RF Bypassing ..................................12 Line Level Signals ....................................Wiring Hookups for Different Sources ...............................13 Works with Servo Inputs Only: ................................13 Compatible with Servo Inputs and other Lectrosonics Transmitters: ....................13 Replacement Parts and Accessories ..............................14 UHF Transmitter Antenna Specifications ............................14 Troubleshooting ....................................15 Specifications and Features ................................17... -
Page 4: General Technical Description
Digital Hybrid Wireless audio chain and ® packaged in the widely recognized Lectrosonics stan- Channel noise still has an impact on received signal dard transmitter housing. quality and will eventually overwhelm the receiver. The Digital Hybrid simply encodes the signal to use a noisy... -
Page 5: No Pre-Emphasis/De-Emphasis
Frequency Synthesized UHF Belt-Pack Transmitter No Pre-Emphasis/De-Emphasis Wide-Band Deviation The signal to noise ratio of the hybrid system is high ± 75 kHz deviation improves the capture ratio, signal to enough to preclude the need for conventional pre-em- noise ratio and AM rejection of a wireless system dra- phasis (HF boost) in the transmitter and de-emphasis matically, compared to the more commonly used ±15 (HF roll off) in the receiver. -
Page 6: Controls And Functions
The front panel AUDIO LEVEL Control is used to adjust left (when using the recommended battery). The LED the incoming audio input level for proper modulation. blinks red when there are only a few minutes of life left. LECTROSONICS, INC. -
Page 7: Modulation Leds
Frequency Synthesized UHF Belt-Pack Transmitter Modulation LEDs Adjustable Low Frequency Roll-Off The Modulation LEDs provide a visual indication of the A 18dB per octave low frequency roll-off is provided in input audio signal level from the microphone. These the audio section, with the -3dB point adjustable from two bicolor LEDs can glow either red or green to indi- 35Hz to 150Hz. -
Page 8: Battery Installation
Selecting the Compatibility Mode cover door in the direction of the arrow as shown in the The UM400a can be used with Lectrosonics 400 Series illustration. Only firm, sliding pressure is needed to open Digital Hybrid, 200 Series analog, 100 Series analog, and close the battery door. -
Page 9: Attaching A Microphone And Adjusting Gain
To gain access to these switches, slide the access door Less than -20 dB sideways with a fingernail. -20 dB to -10 dB Green With Lectrosonics 400 Series receivers, a front panel LCD character display will indicate the correct transmit- -10 dB to +0 dB Green Green... -
Page 10: 5-Pin Input Jack Wiring
PIN 3 Low impedance microphone level input for number listed under Service and Repair in this manual or dynamic microphones. Also accepts hand-held visit our web site at: www.lectrosonics.com electret microphones provided the microphone has its own built-in battery. PIN 4 Bias voltage selector for Pin 3. -
Page 11: Microphone Cord Termination
Frequency Synthesized UHF Belt-Pack Transmitter 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. -
Page 12: Microphone Rf Bypassing
Capacitors are available from Lectrosonics. Please specify the part number for the desired lead style. Leaded capacitors: P/N 15117 Leadless capacitors: P/N SCC330P All Lectrosonics lavaliere mics are already bypassed and do not need any additional capacitors installed for proper operation. LECTROSONICS, INC. -
Page 13: Line Level Signals
PLUG (This configuration handles input signal levels up to 3 V or 12 dBu before limiting and is fully compatible with other Lectrosonics transmitters such as the LM or UM series. A 20 k resistor can be inserted in series with pin 5 for additional 20 dB attenuation (30 V or +32 dBu).) -
Page 14: Replacement Parts And Accessories
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 individual transmitter.) If a situation exists whereby the antenna is defective and the antenna cap is missing, refer to the following chart to determine the correct replacement antenna. -
Page 15: Troubleshooting
Frequency Synthesized 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. Symptom Possible Cause TRANSMITTER BATTERY LED OFF 1) Battery is inserted backwards. - Page 16 UM400a LECTROSONICS, INC.
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Page 17: Specifications And Features
Frequency Synthesized UHF Belt-Pack Transmitter Specifications and Features Operating frequencies: Block 21: 537.600 - 563.100 Block 22: 563.200 - 588.700 Block 23: 588.800 - 607.900 and 614.100 - 614.300 Block 24: 614.400 - 639.900 Block 25: 640.000 - 665.500 Block 26: 665.600 - 691.100 Block 27: 691.200 - 716.700 Block 28: 716.800 - 742.300 Block 29: 742.400 - 767.900... -
Page 18: 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 19 Frequency Synthesized UHF Belt-Pack Transmitter Rio Rancho, NM...
- Page 20 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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