Lectrosonics R175 User Manual
R175
Compact Receiver
OPERATING INSTRUCTIONS
and trouble-shooting guide
Digital Code Squelch
LECTROSONICS, INC.
Rio Rancho, NM
INTRODUCTION
The R175 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
a 9-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 R175 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 .................................................................................................. 2
RECEIVER FRONT PANEL ................................................................................. 3
RECEIVER REAR PANEL ................................................................................... 3
SYSTEM SETUP AND OPERATION .................................................................. 4
INDICATOR QUICK REFERENCE ...................................................................... 4
ANTENNA USE AND PLACEMENT ................................................................... 5
TROUBLESHOOTING ......................................................................................... 6
REPLACEMENT PARTS and ACCESSORIES ................................................... 6
SPECIFICATIONS AND FEATURES ................................................................... 7
SERVICE AND REPAIR ....................................................................................... 8
RETURNING UNITS FOR REPAIR ..................................................................... 8
WARRANTY ......................................................................................... Back cover
2
Compact Receiver
GRN RED
RED
YEL
RECEIVER FRONT PANEL
-20 and 0dB LEDs - 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 level in the transmitter is being limited. It is normal
to see an occasional flicker of the 0dB lamp.
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.
CODE LED - Lights when the transmitter is turned on and the internal code in the transmitter matches this particular
receiver. If the receiver is turned on after the transmitter, the code led will not come on. In this case, it will be necessary to turn the transmitter off and back on to enable the receiver. When the carrier signal from the transmitter is too
weak to produce a clean audio signal the receiver will squelch (no audio) but the code lamp will remain lit.
AUDIO LEVEL - This is an attenuator used to regulate the output level of the receiver. When fully counter-clockwise,
the output of the XLR jack on the rear panel will be fully attenuated. When fully clockwise, the output level will be
similar to a high output electret microphone. Intermediate settings are often necessary to ideally match the level with
other equipment.
LECTROSONICS
AUDIO LEVEL
MODULATION
–20
0dB CODE
OFF
ON
DIGITAL CODE
POWER
RECEIVER REAR PANEL
ANTENNA terminal - A standard BNC connector compatible with the supplied antenna.
12 VDC IN - Connect the power supply here - the CH-12 AC adapter is supplied with the receiver for powering the
unit from a 110V AC source. The receiver may also be powered from an 12 to 18 VDC @ 98mA source using the
correct plug (Switchcraft S-760 , 2.1mm coaxial power plug.) The center pin on the receiver jack is positive (+).
AUDIO OUT (standard XLR jack) - This is the audio output that should connect into your sound system. Being such a
common type of connector, many different adapters and cords are available from local audio or electronics dealers in
your area, or from the factory. The pin configuration is:
Pin 1 - shield
Pin 2 - Audio (+)
Pin 3 - Audio (-)
ANTENNA 12V DC IN
Rio Rancho, NM – USA
1
AUDIO OUT
2
3
3
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