Lectrosonics UM250c User Manual download pdf (Page 3)

UHF Belt-Pack Transmitter

INTRODUCTION

Thank you for selecting the Lectrosonics UM250C frequency agile, belt-pack transmitter. The UM250C combines over

80 years of engineering experience with the very latest components, in a design that addresses the most demanding

professional applications.

The design of the UM250C was the direct result of numerous conversations with users, staging and touring companies

and dealers across the US. The specific concerns and needs brought up in these conversations led directly to the

development of the operational features offered on the UM250C. Two hundred fifty six frequencies are user selectable

in 100kHz steps to alleviate interference problems in travelling venues, and the low frequency roll-off is user 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 input tap for virtually any microphone or line level audio source. 5 Volts of bias voltage is available

to power electret mics with either positive or negative bias. Level indicating LEDs are provided on the control panel to

make input gain settings quick and accurate, without having to view the receiver. The battery compartment accepts

any 9 Volt lithium or alkaline battery and makes a positive connection via self-adjusting contacts. The antenna is a

detachable, locking 1/4 wavelength flexible bronze cable that connects to a 50 Ohm SMA port on the transmitter.

Only the UM250C transmitter is covered in this manual. Companion receivers are covered in separate manuals. The

UM250C will operate with any 200 Series Lectrosonics receiver in the same frequency group.

TABLE OF CONTENTS

GENERAL TECHNICAL DESCRIPTION ...................................................................................................... 4

GENERAL ...................................................................................................................................................................... 4

DUAL BAND COMPANDOR ......................................................................................................................................... 4

NO PRE-EMPHASIS/DE-EMPHASIS ........................................................................................................................... 4

PILOT TONE SQUELCH ............................................................................................................................................... 4

WIDE-BAND DEVIATION .............................................................................................................................................. 5

LONG BATTERY LIFE ................................................................................................................................................... 5

FREQUENCY AGILITY ................................................................................................................................................. 5

ANTENNA ...................................................................................................................................................................... 5

CONTROLS AND FUNCTIONS .................................................................................................................... 6

INPUT JACK .................................................................................................................................................................. 6

POWER ON/OFF SWITCH ........................................................................................................................................... 6

POWER ON LED ........................................................................................................................................................... 6

FREQUENCY SELECT SWITCHES ............................................................................................................................. 6

MODULATION LEDS .................................................................................................................................................... 6

AUDIO LEVEL ................................................................................................................................................................ 6

ANTENNA ...................................................................................................................................................................... 7

ADJUSTABLE LOW FREQUENCY ROLL-OFF .......................................................................................................... 7

BATTERY INSTALLATION ............................................................................................................................. 7

THE BELT CLIP ............................................................................................................................................................. 7

OPERATING INSTRUCTIONS ...................................................................................................................... 8

OPERATING NOTES ...................................................................................................................................... 8

ADJUSTING THE TRANSMITTER FREQUENCY ....................................................................................... 8

MICROPHONE CORD TERMINATION ......................................................................................................... 9

5-PIN INPUT JACK WIRING ...................................................................................................................... 1 0

RF BYPASSING ........................................................................................................................................................... 10

BODY GROUND .......................................................................................................................................................... 11

LINE LEVEL SIGNALS ................................................................................................................................................ 11

WIRING HOOKUPS FOR DIFFERENT SOURCES ................................................................................................. 11

TROUBLESHOOTING ................................................................................................................................. 1 2

SERVICE AND REPAIR .............................................................................................................................. 13

RETURNING UNITS FOR REPAIR ............................................................................................................ 1 3

SPECIFICATIONS AND FEATURES ......................................................................................................... 1 4

LIMITED ONE YEAR WARRANTY ............................................................................................................. 1 6

The UM250B transmitter is FCC type accepted under Part 74: 470-608MHz and 614-806MHz

Rio Rancho, NM – USA

1 2 3 4 5 6 7 8 ... 15 16

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Lectrosonics UM250c User Manual Page 3

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