User Manual
7
OVERALL SYSTEM
UHF Operating Frequency 542.125 MHz to 561.250 MHz
Number of Channels 8
Frequency Stability ±0.005%, Phase Lock Loop Frequency 
control
Modulation Mode FM
Maximum Deviation ±25 kHz
Operating Range 200' typical
Operating Temperature Range 40º F (4ºC) to 110º F (43º C)
Frequency Response 100 Hz to 12 kHz
RECEIVER
Receiving System Antenna Switching Diversity
Image Rejection 55 dB minimum
Signal-to-noise Ratio >80 dB at 10 kHz deviation (IEC 
weighted), maximum deviation 25 kHz
Total Harmonic Distortion ≤1% (10 kHz deviation @ 1 kHz)
Sensitivity 25 dBµV (S/N 60 dB at 10 kHz deviation, 
IEC-weighted)
Audio Output
Unbalanced  211 mV (-13.5 dBV) (1 kHz modulation, 
10 kHz deviation)
Balanced 150 mV (-16.5 dBV) (1 kHz modulation, 
10 kHz deviation)
Output Connectors
Unbalanced
1
/
4
" TS (“mono”) phone jack
Balanced XLRM-type
Power Supply 100-240 VAC (50/60 Hz) to 12V DC 1A 
(center positive) switched mode, external 
power supply
Dimensions 7.48" (190.0 mm) W x 1.65" (42.0 mm) H 
x 5.12" (130.0 mm) D
Net Weight 12.9 oz (365 g)
Accessory Included Power supply
Specifications
†
UNIPAK
™
TRANSMITTER
RF Power Output High: 10 mW; Low: 5 mW 
Spurious Emissions Under Federal Regulations
Dynamic Range >100 dB, A-weighted
Input Connections High impedance, Low impedance, Bias
Batteries (not included) Two 1.5V AA Alkaline
Current Consumption High: 140 mA; Low: 130 mA, typical
Battery Life Approximately 8 hours (High); 10 hours 
(Low), depending on battery type and use
pattern 
Dimensions 2.56" (65.0 mm) W x 4.13" (105.0 mm) H 
x 0.73” (18.5 mm) D
Net Weight (without batteries) 2.8 oz (80 g)
HANDHELD TRANSMITTER
RF Power Output 10 mW
Spurious Emissions Under Federal Regulations
Dynamic Range >100 dB, A-weighted
Microphone Element Dynamic Unidirectional
Batteries (not included) Two 1.5V AA Alkaline
Current Consumption 120 mA, typical
Battery Life Approximately 12 hours depending on 
battery type and use pattern
Dimensions 9.65" (245.0 mm) long, 2.11" (53.5 mm) 
diameter
Weight (without batteries) 9.1 oz (257 g)
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.
Specifications are subject to change without notice.
Optional System Accessories
WIRELESS ESSENTIALS
® 
MICROPHONES AND CABLES
All Wireless Essentials
®
accessories are terminated for use with all A-T
UniPak
™
transmitters.
AT829cW  Miniature cardioid condenser lavalier microphone. 
MT830cW  Miniature omnidirectional condenser lavalier microphone. 
MT830cW-TH  “Theater” model, same as MT830cW except beige color mic 
and cable.
AT831cW  Miniature cardioid condenser lavalier microphone. 
AT889cW  Headworn noise-canceling condenser microphone. 
AT892cW MicroSet
®
headworn omnidirectional condenser microphone.
AT892cW-CO  Same as AT892cW except cocoa-color mic, earset and 
cable.
AT892cW-TH  “Theater” model, same as AT892cW except beige color 
mic, earset and cable.
AT898cW  Subminiature cardioid condenser lavalier microphone. 
AT899cW  Subminiature omnidirectional condenser lavalier microphone. 
AT899cW-TH  “Theater” model, same as AT899cW except beige color mic 
and cable.
ATM350cW  Cardioid condenser instrument microphone. 
ATM73cW  Headworn cardioid condenser microphone. 
ATM75cW  Headworn cardioid condenser microphone. 
PRO 8HEcW  Headworn hypercardioid dynamic microphone. 
PRO 35cW  Cardioid condenser instrument microphone. 
U851cW Surface-mount wide-range hemi-cardioid condenser 
microphone.
U857ALcW Gooseneck cardioid microphone. Mounts to 
5
/
8
"-27 thread. 
AT-GCW  Hi-Z instrument/guitar cable with 
1
/
4
" phone plug.
XLRW  Connecting cable for UniPak
™
transmitter with an XLRF-type 
input connector, for Lo-Z microphones with XLRM-type 
output terminations.
TRANSMITTER ACCESSORIES
AT8114  Foam windscreen for handheld transmitter.
AT8456a Quiet-Flex
™
stand clamp for handheld transmitter, 
5
/
8
"-27 
threads.
700 Series Frequency Channel Plan
Channel Frequency - MHz TV Channel
1 542.125 26
2 545.750
3 551.500 27
4 552.000
5 557.875 28
6 559.375
7 560.500 29
8 561.250
Each transmitter/receiver system operates on a choice of eight
switch-selected frequencies. Available frequencies are shown
in the chart. All frequencies may be combined for up to 8 
simultaneous operating channels.
700 Series UHF Operating Frequencies








