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System 9 Installation and Operation
7
4
3
2
1
For future reference, please record your system information here. The serial number
appears inside the battery compartment in each transmitter, and on the bottom of each
receiver.
Receiver
Model ATW-R900a Serial Number
Transmitter
Model ATW-T90 Serial Number
1a or 2a
OVERALL SYSTEM
Operating Frequencies VHF highband, 169 MHz to 172 MHz
Modulation Mode FM
Maximum Deviation ±10 kHz
Dynamic Range ≥90 dB (A-weighted), typical
Total Harmonic Distortion <1.5% (at 1 kHz, ±10 kHz deviation)
Operating Range 200' (60 m) typical
Open range environment with no interfering signals
Operating Temperature Range 40° F (4° C) to 110° F (43° C)
Battery performance may be reduced at
very low temperatures
Frequency Response 80 Hz to 13 kHz
RECEIVER
Receiving System Non-diversity, single-channel,
dual antenna system
Image Rejection 50 dB minimum
RF Sensitivity 20 dBuV at 60 dB S/N ratio
(50 ohms termination)
Normal Output Level
XLR, balanced: 350 mV (1 kHz modulation, 10 kHz
deviation, 100k ohm load)
1
/4" (6.3 mm), unbalanced: 700 mV (1 kHz modulation, 10 kHz
deviation, 100k ohm load)
Power Supply 100-240V AC (50/60 Hz) to 12V DC .5A
(center positive) switched mode external
power
supply
Dimensions 7.48" (190.0 mm) W x 1.82" (46.2 mm) H x
5.06" (128.5 mm) D
Net Weight 12.0 oz (337 grams)
Accessory Included Power supply
UNIPAK
®
TRANSMITTER
RF Output Power 10 mW
Spurious Emissions Following federal and national regulations
Input Connection Four-pin Locking Connector
Pin 1: GND, Pin 2: INST INPUT,
Pin 3: MIC INPUT, Pin 4: DC BIAS +9V
Batteries (not included) Two 1.5V AA
Battery Life 8 hours (alkaline)
Depending on battery type and use pattern
Dimensions 2.76" (70.2 mm) W x 4.08" (103.7 mm) H
x 0.98" (24.9 mm) D
Net Weight (without batteries) 2.8 oz (80.0 grams)
HANDHELD TRANSMITTER
RF Output Power 10 mW
Spurious Emissions Following federal and national regulations
Batteries (not included) Two 1.5V AA
Battery Life 8 hours (alkaline)
Depending on battery type and use pattern
Dimensions 9.91" (251.8 mm) long,
2.11" (53.5 mm) diameter
Net Weight (without batteries) 9.2 oz (260 grams)
Accessory Included AT8456a Quiet-Flex
™
stand clamp
†
In the interest of standards development, A.T.U.S. offers full details on its test methods to
other industry professionals on request.
System Operating Frequencies
System Operating Frequencies
Each transmitter/receiver system operates on a choice of four switch-
selected frequencies. Available frequencies are shown below. All
frequencies may be combined for up to 4 simultaneous operating
channels.
Traveling frequencies normally work anywhere in the USA and Canada.
Not all frequencies available in all areas outside the US. Please check
with local regulations.
System 9 Operating Frequencies/Channels
Channel Frequency – MHz Frequency Code
1 169.505 T2
2 170.245 T3
3 171.045 T5
4 171.905 T8
RF Interference
Please note that wireless frequencies are shared with other radio ser
-
vices. According to Federal Communications Commission regulations,
“Wireless microphone operations are unprotected from interference
from other licensed operations within 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 Solutions at Audio-Technica U.
S.
Extensive wireless information also is available on the A-T Web site at
www.audio-technica.com.
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