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200 Series Owners Manual  v.1 

7-6-06 

Page 7 of 9 

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 not less than 6' (2 m). 
4. Do not place the receiver antennas within 3' (1 m) of another receiver or 
antenna. 
5. The receiver antennas should be kept away from any metal. 
6. A receiver cannot receive signals from two transmitters at the same time. 
7. In the UniPak transmitter, the “MT” or “GT” input control not in use should be 
set to minimum. 
8. If the receiver output is set too low, the overall signal-to-noise ratio of the 
system may be reduced. Conversely, if the volume control of the receiver is set 
too high, it may over-drive the input of the mixer/amplifier, causing distortion. 
Adjust the output level of the receiver so the highest sound pressure level going 
into the microphone (or the loudest instrument playing level) causes no input 
overload in the mixer, and yet permits the mixer level controls to operate in their 
“normal” range (not set too high or too low). This provides the optimum signal-to-
noise for the entire system. 
9. Turn the transmitter off when not in use. Remove the battery if the transmitter 
is not to be used for a period of time. 
10. Unplug the receiver from the AC outlet when the system is not in use. 

 

System Operating Frequencies 

Frequency Selection 

Each transmitter/receiver system operates on a single factory aligned, crystal-
controlled frequency. Available frequencies are shown in the chart below. 
 
Operating frequency is specified by a two character code, such as “T2,” in 
addition to the actual frequency in MHz. The frequency of each transmitter 
appears on a label on the outside of the unit. The frequency of each receiver 
appears on a label on the rear panel of the unit and the frequency of each 
system appears on the outer carton. For future reference, please record them in 
the space provided below. 

 
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 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 A-T professional division.  

Summary of Contents for ATW-251

Page 1: ...side 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 Notice to individuals with implanted cardiac pacemakers or AICD devices Any source of RF radio frequency energy may interfere with normal functioning of the ...

Page 2: ...tically adapts to changes in mains voltage Unlike bulky linear power supplies this switching power supply is lightweight and compact it uses only a single outlet space The versatile ATW T201 UniPak body pack transmitter has both a high impedance input for instruments and a low impedance input with bias connection for use with dynamic and electret condenser microphones The ATW T202 handheld transmi...

Page 3: ...orizontally in the shape of an L Fig B Use the position that performs better in your operating environment Be certain to extend both antennas to their full 15 38 cm length by holding them at their bases and pulling out on their caps Both antenna elements may be swiveled to the left and right but do not attempt to rotate them in a screwing unscrewing motion To do so may damage the antenna and or re...

Page 4: ... battery observing polarity markings 3 Replace the battery cover Fig F Handheld Transmitter Battery Installation 1 While holding the upper part of the transmitter body just below the ball screen unscrew the lower body cover and slide it downward to expose the battery compartment Fig G Do not attempt to pull the lower body farther down or to gain access to the electronics 2 Lift the white battery k...

Page 5: ...inal experiment with different transmitter positions on your body or instrument or try repositioning the receiver Do not attempt to remove replace or change the length of the transmitting antenna System Operation Turn down the receiver volume control and the mixer amplifier level before starting up the wireless system Do not switch on the transmitter yet Receiver on Plug the power supply into an A...

Page 6: ...t turn the GT control slightly counterclockwise until the AF Peak indicator no longer lights with maximum instrument input to the transmitter After adjusting input level return the screwdriver to its clip and reinstall the battery cover No further transmitter gain adjustments should be needed as long as the input device and the acoustic input level are not changed Adjusting Input Level Handheld Tr...

Page 7: ...heir normal range not set too high or too low This provides the optimum signal to noise for the entire system 9 Turn the transmitter off when not in use Remove the battery if the transmitter is not to be used for a period of time 10 Unplug the receiver from the AC outlet when the system is not in use System Operating Frequencies Frequency Selection Each transmitter receiver system operates on a si...

Page 8: ...udes clothing clip and windscreen Provided with ATW 201 L systems MT830cW Subminiature omnidirectional condenser lavalier microphone Includes clothing clip and windscreen MT830cW TH Theater model same as MT830cW except beige color mic and cable for concealment AT831cW Miniature cardioid condenser lavalier microphone Includes clothing clip and windscreen AT851cW Surface mount wide range hemi cardio...

Page 9: ... in a variety of lengths Also available with one straight and one 90 phone plug as the AT8316 AT8456a Stand clamp for handheld transmitter 5 8 27 threads ATW VP10 Vinyl pouch with belt clip to hold UniPak transmitter Receiver Power Supply Antennas Receiver Controls and Functions Transmitter Controls and Functions ...

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