System 8
Installation and Operation
6
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 AC power source. The green Power
indicator on the front panel will light.
Transmitter on...
When the transmitter is switched on, the receiver’s amber RF signal
indicator will light. The transmitters have a soft-touch power switch.
When the switch is set to “Mute” (red indicator LED), the transmitter
produces RF with no audio signal. When the switch is “On” (green
indicator LED) the transmitter produces both RF and audio. Excessive
audio input to the transmitter will cause the receiver’s red AF Peak
indicator to light.
Receiver Volume
Under typical operating conditions, the receiver’s volume control should
be turned all the way up, with overall system audio gain adjusted at the
mixer or amplifier.
Input Level Adjustment
Input trimmer controls in the transmitters enable you to maximize
performance for a particular microphone or guitar sensitivity, or to
adjust for different acoustic input levels.
Adjusting Input Level - UniPak Transmitter
Slide the battery cover off the top part of transmitter and remove
the screwdriver from its clip (Fig. D). Gently turn both the “MIC”
(Mic Trimmer) and “INST” (Instrument Trimmer) controls to their full
counterclockwise positions (toward “L”).
• Microphone: Adjusting input level
Gently turn only the “MIC” (Mic Trimmer) control all the way
up (clockwise, toward “H”). Check for excessive gain by speaking/
singing into the microphone at typically loud levels while watching the
receiver’s AF Peak indicator. If the AF Peak indicator does light, turn
the “MIC” control slightly counterclockwise until the AF Peak indicator
no longer lights with maximum audio input to the transmitter.
• Guitar/Instrument: Adjusting input level
Gently turn only the “INST” (Instrument Trimmer) control all the way
up (clockwise, toward “H”). Check for excessive gain by playing at
typically loud levels while watching the receiver’s AF Peak indicator.
If the AF Peak indicator does light, turn the “INST” 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 Transmitter
Unscrew the lower body cover and slide it off, exposing the screwdriver
and "LEVEL" (Gain Trimmer) control (Fig. C). Remove the screwdriver
from its clip. Gently turn the "LEVEL" control to its full clockwise
position (toward the side marked “H”), the factory setting. Check for
excessive gain by speaking/singing into the microphone at typically-loud
levels while watching the receiver’s AF Peak indicator. If the AF Peak
indicator does light, turn the "LEVEL" control slightly counterclockwise
until the AF Peak indicator no longer lights with maximum audio input
to the mic/transmitter.
Return the screwdriver to its clip and close and secure the lower body.
No further transmitter gain adjustments should be needed, as long as
the acoustic input does not change significantly.
CAUTION!
The small trimmer controls are
delicate
; use only the
supplied screwdriver. Do
not
force the trimmers beyond their normal
190o range of rotation.
Return the screwdriver to its storage clip when not in use.
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 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 on the same
frequency at the same time.
7. In the UniPak transmitter, the “MIC” or “INST” 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
on the next page.
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 bottom of the unit and the
frequency of each system appears on the outer carton. For future refer-
ence, please record them in the space provided on page 7.
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.
