Lectrosonics R172 User manual

INSTRUCTION MANUAL

R172 DUAL-RECEIVER

LECTROSONICS, INC.

581 Laser Road

Rio Rancho, NM 87124 USA

Tel (800) 821-1121 or (505) 892-4501

fax (505) 892-6243

e-mail: [email protected]

web: www.lectrosonics.com

INTRODUCTION

The R172 receiver is a fixed frequency design two channel wireless microphone receiver. Designed to offer two

simultaneous channels of wireless microphones, the R172 will can operate both channels from one antenna or two

for passive diversity operation. The dual antenna configuration reduces the probability of dropouts resulting from

multipath interference. Additionally, the audio output from this receiver can be either split into discrete channels or

mixed internally for maximum flexibility in any audio installation.

The RF signal first passes through RF filter coils coupled with ultra-low noise J-FETs. The J-FETs are used to

provide enough gain to compensate for inherent losses in the filter stages. Crystal controlled oscillators are used to

minimize drift and are stable over a wide range of temperatures. The output of the front end is then fed to a double

balanced diode mixer which generates an interference free IF signal. The mixer is followed by an LC filter stage and

the signal is amplified.

TABLE OF CONTENTS

Receiver Front Panel ............................................................................2

Receiver Rear Panel .............................................................................3

Operating Instructions: .........................................................................4

Set up sequence

Antenna Use and Placement.................................................................6

Multi-channel Audio Mixing ...................................................................7

Troubleshooting Guide..........................................................................8

Specifications .......................................................................................9

Factory Repair Service .........................................................................10

RECEIVER FRONT PANEL

Front panel controls on the R172 are identical for each channel and operate independently from each other.

MODULATION -- Indicates the modulation (audio level) of the incoming signal. The green LED indicates an

adequate modulation level. The red LED indicates maximum or "peak" modulation.

OUTPUT LEVEL -- An output attenuator is used to reduce the audio output level of the receiver. Reduces the audio

output levels of the XLR jacks in the rear by rotating the knob counter-clockwise.

NOTE: This control does not affect the MODULATION display, the RF LED or the POWER LED --

it also does not affect the output level of the "LINE LEVEL" RCA jack.

RF LED -- Light when the transmitters are turned on. If the carrier signal is too weak to produce a quality signal,

the lamp will go out. Each channel has it's own independent RF LED.

POWER LED -- Lights when the receiver is turned on.

OFF ON SWITCH -This switch activates the receiver when set to the "ON" position.

Figure 1R172 Front Panel

RECEIVER REAR PANEL

ANTENNA terminals -- Standard BNC 50 ohm connectors for connecting the antennas. The R172 is normally

shipped with a telescoping whip antenna and a coaxial antenna. Rack mounted units are shipped with two coaxial

antennas.

ANTENNA MODE -The unit may be operated as either a single antenna or a dual antenna system. If two

antennas are used set the switch to DUAL. If operating with only one antenna, set the switch to SNGL.

12 VDC DC POWER -- Connect the power supply here -- the CH-12 AC adapter is supplied with the receiver for

powering the unit from a 110 V AC outlet -- the receiver may also be powered from 12 volt DC sources using the

correct plug (Switchcraft S-760 power plug); the center pin is positive (+).

AUDIO OUTPUTS

MIC LEVEL -- 3 pin XLR at microphone level (80mV max.); 200 ohm impedance for either balanced or unbalanced

inputs

LINE LEVEL -- RCA phono jack at "line" level (1 volt max); 1K ohm impedance for unbalanced inputs. The output

level of this RCA jack is not affected by the front panel OUTPUT LEVEL control.

SEPARATE MIXED SWITCH -Allows the "A" and "B" audio signals to be mixed, if desired. Setting the switch to

SEPARATE will keep the signals from the two channels discrete. Setting the switch to MIXED will mix the signals

internally, allowing both channels to be output through either output jack.

AUDIO INPUT (mixing bus)

AUX INPUTS -- RCA phono jack inputs accept external tape deck or other audio source; mixes audio with receiver

output. Also allows "stacking" multiple receivers.

Figure 2R172 Rear Panel

OPERATING INSTRUCTIONS

SET UP AND OPERATION SEQUENCE

1) CONNECT POWER CORD -- Plug the connector of the CH-12 adapter included with the receiver into the jack

labeled "12 VDC INPUT." Insert the plug fully into the jack.

2) ATTACH THE ANTENNAS -Two antennas are provided with the receiver. If the system is not rack mounted,

the unit will have a telescoping whip antenna and a coaxial dipole antenna (this antenna looks like a piece of cable

with a small loop in one end and a BNC connector on the other). If it has been mounted into an RMP3 rack kit, then

it will have two coaxial dipole antennas.

If the system will be installed with one antenna -Attach the single antenna to the BNC connector

marked SNGL on the rear of the receiver. Set the ANTENNA MODE switch to SNGL

If the antenna is the telescoping whip, extend the antenna to its full length.

The coaxial dipole antenna should be uncoiled and led away from the receiver. The loop on the end is

provided as a convenient attachment point. The cable should be hung on a wall or suspended so the last

3.5 ft are straight and not close to any metal surfaces such as file cabinets, metals walls, or metal studs.

Wood stud drywall construction will present no problems and the antenna may be hung against the wall.

Some contractors have actually run the antenna up inside hollow walls. Be sure to test the system before

committing the system to a particular antenna placement.

Figure 3Single Antenna Options

If the system will be installed with dual antennas -Attach both antennas to the dual BNC connectors

on the back of the receiver. Set the ANTENNA MODE switch to the DUAL position. If a telescoping whip

is used, fully extend the whip. DO NOT USE TWO TELESCOPING WHIPS ATTACHED SIDE BY SIDE

AT THE RECEIVER. There is little to no benefit of placing the antennas side by side. Place the coaxial

antennas in the same manner as described above. The two antennas should be placed at least 6 ft apart

for best reception. This will put each antenna into a different signal path (diversity) and reduce the

possibility of dropout.

Figure 4Dual Antenna Options

3) CONNECT THE AUDIO CABLE/S -

If the receiver will be connected directly to an amplifier and there is only one audio input available, set the

SEPARATE/MIXED switch to the mixed position and connect the cable to either the "A" or "B" output jack.

You may also used the MIXED position to connect the receiver to a tape deck and an amplifier for

simultaneous recording. See the illustration below.

If the receiver will be connected to a mixer or an amplifier with two (or more) audio inputs, then set the

switch to SEPARATE. By doing so, the audio signals will be separate and can be adjusted independently

at the mixer or amplifier. Connect the receiver with two cables to the amplifier or mixer.

Figure 5Audio Connections

4) SET FRONT PANEL SWITCH TO "ON" POSITION -Be sure the POWER LED lights.

5) ADJUST TRANSMITTER "MIC LEVEL" (See transmitter manual)

This is perhaps the most important step in the set up procedure. See your transmitter manual for specific

instructions on the proper gain adjustment of your transmitter. With some transmitter models you will

need to observe the MODULATION LED's on the receiver front panel as you adjust the gain on the

transmitter.

6) SET THE OUTPUT LEVELS -Set the front panel controls for OUTPUT LEVEL on each channel to the

"NORMAL" (at the 3 o'clock position)

7) ADJUST THE SOUND SYSTEM VOLUME

ANTENNA USE AND PLACEMENT

Extend the antennas fully. Position the antennas so that they are not touching each other or within 3 or 4 feet of

large metal surfaces. It is also good practice to position the receiver so that there is a direct "line of sight" between

the transmitter and the receiver antenna. In the dual antenna mode, place the antennas at least 6 ft apart. If the

installation has two rooms serviced by the same receiver, you may want to extend one antenna into one room and

place the other antenna into the second room. See the illustration below.

A wireless transmitter sends a radio signal out in all directions. This signal will often bounce off nearby walls,

ceilings, etc. and a strong reflection can arrive at the receiver antenna along with the direct signal. If the direct and

reflected signals are out of phase with each other a cancellation may occur. The result would be a "drop out." A

drop out sounds like either audible noise (hiss), or in severe cases, may result in a complete loss of the sound when

the transmitter is positioned in certain locations in the room. A dropout normally sounds like "hum" or "hiss."

Moving the transmitter (even a few inches) will change the hum or hiss, or eliminate it. A dropout situation may be

either better or worse as the crowd fills and/or leaves the room. The dual antenna configuration (passive diversity)

of the R172 helps reduce the probability of this problem occurring.

In the event that you do encounter a dropout problem, first try moving the receiver/antennas at least 3 or 4 feet from

where they were. This may alleviate the dropout problem. If dropouts are still a problem, try moving the receiver

and/or the antennas to an entirely different location in the room. Note -moving the receiver will only have an

effect if there is a telescoping whip antenna attached directly to the receiver. If both antennas are the coaxial

cable type, you will only need to move them around.

MULTI-CHANNEL AUDIO MIXING

The R172 receiver offers a unique feature that eliminates the necessity of using an external audio mixer in

multi-channel applications. When using two R172 receivers together, the LINE LEVEL and AUX INPUTS jacks

provide "unity gain" mixing of the audio signals. This means that the audio output of the receivers may be mixed

together through these connectors without affecting the volume levels. Connect the LINE LEVEL jack of one

receiver to the AUDIO IN jack of the next receiver, then connect its LINE LEVEL jack to the AUX INPUTS jack of

the next receiver, forming a "chain" as shown in the illustration.

Two receivers may be interconnected in this manner so that a single audio output is available from the output of the

last receiver in the "chain".

The output level of the LINE LEVEL RCA jack is not affected by the OUTPUT LEVEL control. The OUTPUT

LEVEL control on the last receiver in the "chain" will control the combined volume of all the receiver outputs. In

order to control the receiver outputs independently, you will need to use an external microphone mixer without the

"jumper" cords shown below.

MIXING AN EXTERNAL TAPE DECK WITH RECEIVER OUTPUT

A tape player (or other audio source) may be connected to the AUDIO IN jack on the rear panel to mix the tape

player output with the receiver output. Adjust the volume of the tape player with the volume control on the tape

player since there is not a separate control for this purpose on the receiver. You may also record from the R172 by

connecting to the LINE LEVEL jacks on the rear panel.

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