Lectrosonics SR170AC User Manual

SR170 AC

RECEIVER

OPERATING INSTRUCTIONS

and trouble-shooting guide

LECTROSONICS, INC.

Rio Rancho, NM

INTRODUCTION

The SR170 AC receiver design is the result of surveying the needs of professional video producers,
audio visual coordinators, and many others in the industry. Numerous conversations with dealers and
end-users have developed the parameters for the design.

The SR170 AC receiver is a fixed frequency design utilizing a quartz crystal oscillator. This assures
that the frequency will not drift and also eliminates the need to "tune" or adjust the receiver every time it
is used. This is the preferred design that professionals have chosen.

Custom made toroidal filters in the front-end reject adjacent channels to avert interference. A noise
reduction "compandor" is used in all Pro-Series systems to suppress audio noise without impairing the
natural dynamics of the audio signal. The receiver is housed in an aluminum extrusion with rugged
connectors for years of professional performance. The SR170 AC receiver is compatible with all
Lectrosonics high-band receivers.

While the SR170 AC was designed primarily to meet the needs of video producers, it has many other
applications in public address.

TABLE OF CONTENTS

INTRODUCTION .......................................... 1

RECEIVER FRONT PANEL ................................... 2

RECEIVER REAR PANEL .................................... 3

SYSTEM SETUP AND OPERATION ............................ 4

INDICATORS ............................................. 4

ANTENNA USE AND PLACEMENT ............................. 5

TROUBLESHOOTING ....................................... 6

REPLACEMENT PARTS and ACCESSORIES ..................... 6

SERVICE AND REPAIR ..................................... 7

RETURNING UNITS FOR REPAIR ............................. 7

SR170 AC SPECIFICATIONS AND FEATURES .................... 8

WARRANTY ........................................ Back cover

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RECEIVER FRONT PANEL

MODULATION - Indicates the modulation (audio level) of the incoming signal - see transmitter manual

for proper adjustment of transmitter "MIC LEVEL" or "GAIN." The -20 lamp should flicker, or stay lit as
you speak into the microphone. The 0dB lamp is a "peak" indicator showing that the audio gain in the
transmitter is set too high. It is normal, however, to see an occasional flicker of the 0dB lamp.

POWER OFF-ON Switch - This slide switch turns the power off and on.

POWER LED - Glows when the switch is in the "ON" position and the power source is good, or when

the AC adapter is properly connected. If this LED is very dim or does not light up when the switch is
turned on, check the power source.

RF LED - Lights when the transmitter is turned on. When the carrier signal from the transmitter is too
weak to produce a clean audio signal the lamp will go out.

Figure 1 -SR170AC Front Panel

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