Audio Technica ATW-R92 Guide

ATW-R92 UHF Synthesized Diversity Dual Receiver
Installation and Operation

Location
For best operation the receiver should be at least 1 m.
above the ground and at least 1 m. away from a wall or
metal surface to minimize
reflections. The transmitter
should be at least 1 m. from
the receiver, as shown in
Figure A.
Keep antennas away from
noise sources such as digital
equipment, motors,
automobiles and neon
lights, as well as large
metal objects.
2
ATW-R92 UHF Synthesized Diversity Dual Receiver
Installation and Operation
CAUTION! The circuits inside the receiver and transmitter
have been precisely adjusted for optimum performance and
compliance with federal regulations. Do not attempt to open
the receiver or transmitter. To do so will void the warranty, and
may cause improper operation.
Individuals with implanted cardiac pacemakers or AICD
devices:Please see notice on back cover.
This device complies with part 15 of the FCC Rules. Operation
is subject to the condition that this device does not cause
harmful interference.
This device complies with INDUSTRY CANADA R.S.S. 210, en
conformit avec IC: RSS-210/CNR210. Operation is subject to
the following conditions: 1) This device may not cause harmful
interference and 2) this device must accept any interference
received, including interference which may cause undesired
operation.
Introduction
Audio-Technica Engineered Sound¨wireless systems are
offered as separate receiver and transmitter units, rather
than in predetermined combinations, for greatest system
flexibility. Operating details for Engineered Sound transmit-
ters are included with each transmitter.
Engineered Sound receivers feature a sophisticated Tone
Lockªtone squelch system that opens only when an
Engineered Sound transmitter is detected, reducing the
possibility of interference. As a result, Engineered Sound
transmitters and receivers must be used together and
should not be used with components from other
Audio-Technica wireless systems, or with those of other
manufacturers.
The ATW-R92 Dual Receiver unit features two independent
receivers in its housing, along with an antenna combiner/
divider system. Each receiver offers 100 PLL-synthesized
UHF frequencies and true diversity reception. In each
receiver, two antennas feed two completely independent
RF sections (Tuners) on the same frequency. Automatic
logic circuitry continuously compares and selects the superi-
or received signal, providing better sound quality and
reducing the possibility of interference and dropouts. The
ATW-R92 is housed in a full-width standard 19" (1U)
rack-mountable case, with rack-mount adapters included.
The antenna combiner/divider system in the ATW-R92
provides two "A" and two "B" antenna inputs that feed
each of the two diversity tuners in each receiver. As one
example, the two pairs of inputs might be used when
coverage of a split banquet/meeting room is difficult with
a single pair of antennas, or when considerable multipath
interference is present. Two "A" and two "B" antenna
output jacks are provided to feed other wireless receivers
operating in the same frequency band. With the addition of
two more ATW-R92 dual receiver units, up to six receiver
channels can be operated from a single pair of antennas.
However, any type of receiver in the same band, or even a
separate active antenna divider, may be fed by the antenna
outputs. The ATW-R92 also provides +12V DC on the
antenna input jacks to power in-line RF devices.
Please note that in multiple-system applications there must
be a transmitter-receiver pair set to a separate frequency for
each input desired (only one transmitter at a time for each
receiver). Because the wireless frequencies are on UHF TV
frequencies, only certain wireless frequencies may be use-
able in a particular geographic area. Also, only certain of the
available operating frequencies may be used together in
multi-channel systems. (Suggestions for multiple-frequency
groupings will be found on page 7.)
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Warning: This apparatus must be grounded.
This product is a safety class 1 product.
There must be an uninterruptible safety earth
ground from the main power source to the
product's AC input. Whenever it is likely that
the protection has been impaired, disconnect
the power cord until the ground has been
restored.
Attention: Cet appareil doit etre mise a la
terre. Cet appareil est de classe de surete 1.
Il doit y avoir un ininterrompable de mise a la
terre de securite provenant de la source
principale de courant de l'appareil de l'entree
du courant alternatif. Quand la protection a ete
affaiblie, d brancher le fil de courant jusqu'a la
mise a terre a bien ete reetablie.
Warning: To prevent fire or shock hazard, do
not expose this appliance to rain or moisture.
Attention: Pour prevenir feu ou choc
electrique, ne pas expose l'appareil a la pluie
ou a l'humidite.
Caution/Avis: For continued protection
against fire hazard, replace only with same
type/rating of fuse.
Pour poursuivre la protection contre le feu,
replacez la fusible de meme type/cote.
Warning/Attention: There are some sharp
edges inside. To reduce the risk of injury,
do not remove cover.
Bord tranchant a l'interieur. Pour reduire le
risque de blessure, ne pas ouvir le couvercle.
To prevent electric shock, do not remove the
cover. There are no user-serviceable parts
inside. Internal adjustments are for qualified
professionals only. Refer all servicing to
qualified service personnel.
Pour prevenir un choc electrique, ne pas ouvrir
le couvercle. Il n'y aucune pieces de rechanges
a l'interieur. Tout ajustement interne doit etre
fait par une personne qualifi seulement.
Referez tout reparation au personnel qualifie.
Receiver Installation
Fig. A
1m
1m
1m 1m

3
Output Connections
There are two audio output jacks on the back for each of
the receivers: balanced (4 mV) and unbalanced (40 mV).
Use shielded audio cable for the connection between the
receiver and the mixer. If the input of the mixer is a 6.3mm
jack, connect a cable from the 6.3mm unbalanced audio
output on the back of the receiver housing to the mixer . If the
input of the mixer is an XLR-type input, connect a cable from
the balanced XLR-type audio output on the back panel to the
mixer. The two isolated audio outputs permit simultaneous
feeds to both unbalanced and balanced inputs. For example,
both a tape recorder and a mixer can be driven by each
receiver.
Antennas
Attach a pair of UHF antennas to the antenna input jacks;
connect one to the main "Antenna A In" jack and one to the
main "Antenna B In" jack. See Figure B. The antennas are
normally positioned in the shape of a "V" (45 degreefrom
vertical) for best reception.
The antennas can be remotely located from the receiver.
However, due to signal loss in cables at UHF frequencies,
use the lowest-loss RF cable type(s) practical for any cable
runs over 25 feet. RG-8 is a good choice. Use only copper-
shielded cable, not CATV-type foil-shielded wire.
The two pairs of antenna inputs might be used when
coverage of a split banquet/meeting room is difficult with a
single pair of antennas, or in the case of multipath-prone
areas. Simply connect another set of
remote antennas to
the alternate "A" and "B" inputs. (Main and alternate
antenna inputs are identical and interchangeable.) The
unique RF nature of each venue normally requires some
experimentation to determine the best locations, if any ,
for additional antennas.
All four antenna input jacks also provide +12V DC output
on their center pins to power in-line RF devices. A combined
total of 20 mA can be drawn from the "A" jacks and 20 mA
from the "B" jacks. While an accidental short-circuit will not
harm the internal 12V supply, make certain that an antenna
cable shield does not contact the center conductor.
Power Connections
The switching power supply is designed to operate properly
from any AC power source 120-240V, 50/60 Hz without
adjustment. Simply connect to a standard AC power outlet,
using an IEC input cordset approved for the country of
operation. Use the included cable clamp to secure the plug
in the chassis connector. Power to the unit is controlled by
the front-panel Power switch.
Headphone Jack
A headphone jack on the front panel provides monitoring
of each receiver's output. The 6.3mm jack is intended for
use with stereo headphones. The "Phones" level control
affects the headphone jack only.
Fig. B Antenna Connections

4
Receiver Controls And Functions
Fig. C Receiver Front Panel
Fig. D Receiver Rear Panel
1
2
467 8 9 10
52
3467 8 9 10
5
311
12 13 14 15 16 17 18 19
16 UNBALANCED AUDIO OUTPUT JACK:6.3mm phone
jack. Can be connected to an unbalanced aux-level
input of a mixer, guitar amp or tape recorder.
17 AC POWER: IEC-type connector for 120-240V AC
50/60 Hz power input. No adjustment for mains
voltage/frequency is necessary.
18 POWER CABLE CLAMP: Use provided cable clamp
to secure the plug in the chassis connector.
19 GROUND TERMINAL: Case grounding screw, if
needed.
Rear Panel Controls and Functions (Fig. D)
Antenna "A" / Antenna "B"
12 INPUT JACKS: BNC-type antenna connectors for "A"
and "B" Tuners in both receivers. Attach antennas
directly, or extend them with low-loss antenna cable.
See the "Antennas" section on page 3 for more details.
13 OUTPUT JACKS: Provide RF distribution to other
receivers operating in the same frequency band. Each
output should be connected to only one other antenna
input, without "daisy-chaining." (Using two additional
ATW-R92 dual receiver units provides a total of six
channels in three rack spaces with a single pair of
antennas.)
Receiver 1 / Receiver 2
14 GROUND LIFT SWITCH: Disconnects the ground pin
of the balanced output (15) from ground. Normally, the
switch should be to the right (ground connected). If
hum caused by a ground loop occurs, slide switch to
the left.
15 BALANCED AUDIO OUTPUT JACK: XLRM-type connec-
tor. A standard 2-conductor shielded cable can be used
to connect the receiver output to a balanced micro-
phone-level input on a mixer or integrated amplifier.
12 13 14 15 16
Front Panel Controls and Functions (Fig. C)
1 POWER SWITCH: Press switch On and the Channel
Designator Displays (5) will light.
Receiver 1 / Receiver 2
Controls and operation of the two receivers are identical.
2 AF LEVEL INDICATOR: Indicates the audio modulation
level of the received signal. The LEDs light up from left
to right.
3 RF LEVEL INDICATOR: Indicates the strength of the RF
signal received from the transmitter.
4 TUNER OPERATION INDICATOR: Indicates which Tuner
(A or B) has the better reception and is in operation.
Lights only when receiving an ES transmitter's signal.
5 CHANNEL DESIGNATOR DISPLAY: Indicates the current
channel setting.
6 CHANNEL SET BUTTON: Hold this button in and
press "Up" or "Down" to change the channel shown
in the Channel Designator Display.
7 CHANNEL SELECTOR "DOWN" SWITCH: Changes
the channel designator, decreasing from 99 to 00.
"Rolls over" from 00 to 99.
8 CHANNEL SELECTOR "UP" SWITCH: Changes the
channel designator, increasing from 00 to 99. "Rolls
over" from 99 to 00.
9 "PHONES" LEVEL CONTROL: Adjusts the level of
the headphone jack only; it does not affect receiver
audio output.
10 HEADPHONE OUTPUT: 6.3mm phone jack. Plug in
a "stereo" headphone to monitor receiver signal.
11 MOUNTING ADAPTERS: For mounting the receiver in
any standard 19" rack. Attach to receiver with screws
supplied.

Turn down the mixer /amplifier level before starting up the
wireless system.
Switch on the receiver. Do not switch on the transmitter yet.
Receiver On...
The Channel Designator Displays will light. If any of the RF
LEDs light up at this point, there may be RF interference in the
area. If this occurs, select another frequency using the front-
panel channel selectors. While holding in the "Set" button,
press the "Up" or "Down" button to access the desired
frequency; then release the Set button to select the channel.
Transmitter On...
Refer to the manual included with each Engineered Sound
transmitter for details of setup and operation.
Before turning on the transmitter , make certain it is set to the
same operating channel as the receiver . When the transmit-
ter is switched on and in normal operation, the
receiver's RF signal level indicators will light up from left to
right. For optimum performance at least four, and preferably
five, of the signal strength indicators should light up when the
transmitter is switched on. One of the T uner LEDs (A or B)
also will light up when the transmitter is on, indicating that its
signal has been received and the receiver's Tone Lock squelch
circuit has opened.
Setting Levels
Although Engineered Sound receivers require no level
adjustment, correct adjustment of transmitter audio input
and mixer/amplifier input and output levels is important for
optimum system performance.
Engineered Sound transmitters include adjustments for
optimum audio modulation levels. Refer to the transmitter' s
manual for full details. Maximum audio input to the mic or
guitar should light about three or four green LEDs on the
receiver's AF Level indicator. Audio modulation from the
transmitter level should not be allowed to light the red LED -
doing so will cause the system to overload and distort.
The audio output level of the ATW-R92 has been optimized
for best performance and no adjustment is necessary. The
level control on the front panel controls the headphone jack
only.
Receiver Squelch
The sophisticated Tone Lockªsystem in AT wireless units
eliminates the need for any user-adjustable squelch control on
the receiver. Do not attempt to open the receiver housing or
adjust any internal alignment controls.
RF Interference
Please note that wireless frequencies are shared with other
radio services. According to Federal Communications
Commission regulations, "Wireless microphone operations are
unprotected from interference from other licensed operations
in the band. If any interference is received by any Government
or non-Government operation, the wireless microphone must
cease operation..."
If you need assistance with operation or frequency selection,
please contact your dealer or the Audio-Technica professional
division. Extensive wireless information also is available on the
Audio-Technica Web site at www .audio-technica.com.
5
System Operation
Ten Tips To Obtain The Best Results
1. Use only fresh alkaline batteries. Do not use "general
purpose" (carbon-zinc) batteries.
2. Position the receiver so that it has the fewest
possible obstructions between it and the normal
location of the transmitter. Line-of-sight is best.
3. The transmitter and the receiver should be as close
together as conveniently possible, but no closer
together than three feet.
4. The receiver antennas should be in the open and
away from any metal. If mounted in a rack, have the
unit on top, or use external/remote antennas.
5. Each transmitter/receiver pair must be set to the
same channel number.
6. A single receiver cannot receive signals from two
transmitters at the same time.
7. For best operation, all the RF Level LEDs should be
lit (maximize RF input); but only the first two or three
AF Level LEDs should be lit (don't overmodulate).
8. You need to change channels 1) when a strong
interference signal is received, 2) when the channel
breaks down, or 3) during multiple-system operation
in order to select an interference-free channel.
9. In the UniPak transmitter, the "MT" or "GT" input
control not in use should be set to minimum.
10. Turn the transmitter off when not in use. Remove the
batteries if the transmitter is not to be used for a
period of time.

6
Specifications Receiver Accessories
OVERALL SYSTEM
Operating Frequency UHF band, 800.550 to 819.700 MHz
Number of Channels 100 total
Frequency Stability ±0.005%, Phase Lock Loop
frequency control
Modulation Mode FM
Normal Deviation ±5 kHz
Tone Squelch Frequency 32.768 kHz
Operating Range 90m typical
Operating Temperature Range 5C degree to 45C degree
Frequency Response 100 Hzto 15 kHz
ATW-R92 RECEIVER
Receiving System Dual independent tuners, automatic
switching diversity
Image Rejection >100 dB
Signal-to-noise Ratio >107 dB (IEC-weighted at ±40 kHz
deviation)
Total Harmonic Distortion <1% (±5 kHz deviation at 1 kHz)
Sensitivity 18 dBµV (S/N 60 dB at ±5 kHz
deviation, IEC-weighted)
Intermediate Frequencies 54.25 MHz, 10.7 MHz
Audio Output
Unbalanced: 40 mV (at 1 kHz, ±5 kHz deviation,
1M ohm load)
Balanced: 4 mV (at 1 kHz, ±5 kHz deviation,
600 ohm load)
Output Connectors
Unbalanced: 6.3mm phone jack
Balanced: XLRM-type
Headphone Output 20 mW max. into 16 ohms
(at 1 kHz, ±5 kHz deviation)
Antenna Inputs BNC-type, 50 ohms, two "A" and
two "B"
Antenna Outputs BNC-type, 50 ohms, two "A" and
two "B"
Antenna Power +12V DC on input jacks, 20 mA max.
from "A" jacks, 20 mA max. from
"B" jacks
Power Supply 120-240V AC, 50/60 Hz, autoadjusting
Dimensions 430.0 mm W x 44.0 mm H x 175.0 mm D
without antennas, rack-mount adapters
Weight 2.9 kg
Accessories Included Two flexible UHF antennas,
rack-mount adapters, power cable and
power cable clamp
In the interest of standards development, A.T.U.S. offers full details on its test methods
to other industry professionals on request.
ATW-A20 Pair of UHF ground-plane antennas with5/8"-27 thread
for mounting to microphone stands, etc. Takes RF
cables with BNC connectors, not included.
ATW-D80 UHF (800 MHz) active unity-gain antenna distribution
system provides two "1-in, 4-out" RF channels; connects
a pair of antennas to as many as four diversity receivers.
Includes four DC interconnect cables to power up to
four receivers, eight RF output cables and two rack-mount
adapters. Mounts in a single (1U) 19" rack space.
For future reference, please record your system information here (the serial number appears on the bottom of the
receiver):
Receiver ATW-R92 Serial Number

7
Audio-Technica UHF Wireless Operating Frequencies
Multi-channel Systems
Following are groupings of frequencies suggested for multi-channel wireless systems.
Group A: Channels 01 (or 04), 09, 13, 18, 22, 32, 34, 40, 44, 47 -or-
Group B: Channels 56, 58, 63, 66, 78, 81, 85, 88, 93, 97
Designator Frequency (MHz)
00 800.550
01 800.575
02 800.600
03 801.100
04 801.125
05 801.150
06 801.200
07 801.450
08 801.925
09 801.950
10 801.975
11 802.075
12 802.200
13 802.225
14 802.250
15 802.325
16 802.575
17 803.025
18 803.050
19 803.075
20 803.550
21 803.575
22 803.600
23 803.625
24 803.700
25 804.825
26 805.075
27 805.150
28 805.200
29 805.300
30 805.775
31 806.900
32 806.925
33 806.950
34 807.400
35 807.425
36 807.450
37 808.525
38 808.550
39 808.575
40 808.600
41 808.625
42 809.100
43 809.175
44 809.200
45 809.225
46 809.450
47 809.475
48 809.925
49 809.950
Designator Frequency (MHz)
50 810.075
51 810.200
52 810.325
53 810.550
54 810.575
55 811.075
56 811.100
57 811.550
58 811.575
59 811.600
60 811.700
61 812.775
62 812.800
63 812.825
64 812.850
65 813.075
66 813.100
67 813.125
68 813.200
69 813.300
70 813.750
71 813.775
72 814.850
73 814.875
74 814.950
75 815.425
76 815.450
77 816.525
78 816.550
79 816.575
80 816.650
81 817.100
82 817.125
83 817.200
84 817.450
85 817.925
86 817.950
87 818.075
88 818.200
89 818.225
90 818.325
91 818.550
92 818.575
93 819.025
94 819.050
95 819.075
96 819.550
97 819.575
98 819.600
99 819.700
Frequency and Channel Designator List

Audio-Technica US., Inc., 1221 Commerce Drive, Stow, Ohio 44224 330/686-2600
Form No. ATGC-0023-04-WM
Notice to individuals with implanted car diac pacemakers or AICD devices:
Any source of RF (radio frequency) energy may interfere with normal functioning of the implanted device. All wire-
less microphones have low-power transmitters (less than 0.05 watts output) which are unlikely to cause difficulty,
especially if they are at least a few inches away. However , since a "body-pack" mic transmitter typically is placed
against the body, we suggest attaching it at the belt, rather than in a shirt pocket where it may be immediately adjacent
to the medical device. Note also that
any medical-device disruption will cease when the RF transmitting source
is turned off
. Please contact your physician or medical-device provider if you have any questions,or experience any
problems with the use of this or any other RF equipment.
Audio-Technica Corporation, 2206 Naruse,Machida, Tokyo 194-8666, Japan