Lectrosonics UM250C Operating Instructions And Troubleshooting Manual Download Page 1 | Manualshive

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UM250C

FREQUENCY-AGILE UHF

BELT-PACK TRANSMITTER

LECTROSONICS, INC.

Rio Rancho, NM

www.lectrosonics.com

OPERATING INSTRUCTIONS

and trouble-shooting guide

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Summary of Contents for UM250C

Page 1: ...UM250C FREQUENCY AGILE UHF BELT PACK TRANSMITTER LECTROSONICS INC Rio Rancho NM www lectrosonics com OPERATING INSTRUCTIONS and trouble shooting guide...

Page 2: ...HNICAL 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 WI...

Page 3: ...er adjustable to adapt to varying acoustic environments and preferences The UM250C is a rugged machined aluminum package with a removable spring loaded belt clip The input section provides a correct i...

Page 4: ...frequency audio distortion will be low but high frequency transients will then be distorted The 200 system introduces an entirely new approach to solving this basic problem called dual band compandin...

Page 5: ...the receiver so that it does not influence the compandor or various gain stages The basic benefit of the pilot tone squelch system is that the receiver will remain muted until it receives the pilot t...

Page 6: ...After about 7 hours of operation with a lithium battery the battery voltage will be about 7 Volts and the LED will be nearly out FREQUENCY ADJUST These two rotary switches adjust the center frequency...

Page 7: ...CY ROLL OFF A 18dB per octave low frequency roll off is provided in the audio section with the 3dB point adjustable from 35Hz to 150Hz The actual roll off frequency will vary somewhat according to the...

Page 8: ...as shown in the drawing Only firm sliding pressure is needed to open and close the battery door Swing the door open and take note of the polarity marked inside showing the location of the positive and...

Page 9: ...n The 0 LED turns on at full deviation and indicates that the input shunt compressor is operating The input limiter will handle peaks over 30dB above full modulation regardless of the gain control set...

Page 10: ...tructions 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 Shield Wire Crimp Tabs R...

Page 11: ...em sensitive to RF which can cause problems with the microphone transmitter compatibility If the electret microphone is not designed properly for use with wireless transmitters it may be necessary to...

Page 12: ...The normal hookup for line level signals is Signal Hot to pin 5 Signal Gnd to pin 1 pin 4 jumped to pin 1 and pin 3 jumped to pin 1 This gives a 40dB attenuator that allows signal levels much higher t...

Page 13: ...er output level set too low 2 Receiver output is disconnected cable is defective or mis wired 3 Sound system or recorder input is turned down DISTORTED SOUND 1 Transmitter gain audio level is far too...

Page 14: ...quotation We will be happy to quote approximate charges by phone for out of warranty repairs RETURNING UNITS FOR REPAIR You will save yourself time and trouble if you will follow the steps below A DO...

Page 15: ...reater than 10k Input compressor Soft compressor 30 dB range Gain control range 43 dB semi log rotary control Modulation indicators Dual LEDs indicate modulation level 12 dB below limiting and at the...

Page 16: ...c or an authorized dealer shipping costs prepaid within one year from the date of purchase This Limited Warranty is governed by the laws of the State of New Mexico It states the entire liablility of L...

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