Lectrosonics SR175 - Manual (Page 2)

INTRODUCTION
The SR175 is a fixed frequency, crystal controlled receiver designed for use in public address
applications. A proprietary Digital Code Squelch* is used in the system design to eliminate squelching
problems caused by interference. The compact size of the receiver permits mounting the receiver
almost anywhere. The audio output is a balanced XLR type, variable in level, to match any type of
sound system.
The digital code system provides much more reliable control over the receiver audio output than a
conventional squelch can provide. The matching transmitter generates an 8-bit code at turn on, and
another code at turn off, to open and close the audio output on the receiver. The squelch on the
receiver cannot be opened by anything other than the specific code it is programmed to receive. This
type of squelch system is even more important when the receiver is connected into an automatic mixing
system.
The SR175 circuitry utilizes the latest surface mount technology, with significant oscillator shielding. Up
to four systems can be operated simultaneously in close proximity in the 169 to 172 MHz band without
intermodulation, crosstalk or squelch problems. The housing is a durable aluminum extrusion with
rugged connectors for lasting reliability.
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
SR175 SPECIFICATIONS AND FEATURES . . . . . . . . . . . . . . . . . . . . . . .
8
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back cover
1