7
Fig. G
Screwdriver
Gain Trimmer
(VR1)
•
Guitar/Instrument: Adjusting input level
While playing at typically-loud levels, carefully turn the GT control clockwise while watching the
receiver’s AF Peak indicator. Increase the GT control setting until the AF Peak indicator lights.
This indicates that maximum transmitter modulation without significant distortion has been
reached.
(When using a microphone, return the GT control setting to minimum.)
After adjusting input levels, 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 downward, exposing the screwdriver and gain trimmer
(Fig. G). Remove the screwdriver and
gently
turn the gain trimmer control to its full counter-clock-
wise position.
While speaking/singing into the microphone at typically-loud levels, carefully turn the trimmer
control clockwise while watching the receiver’s AF Peak indicator. Increase the control setting until
the AF Peak indicator lights. This indicates that maximum transmitter modulation without
significant distortion has been reached.
Return the screwdriver to its clip and close and secure the lower body. (Make certain that the
white “battery keeper” arm is inside the body.) No further transmitter gain adjustments should
be needed, as long as the acoustic input does not change significantly.
Ten Tips To Obtain The Best Result
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.
4. Do not place the receiver antennas within three feet 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 volume control of the receiver is set too high, it may over-drive the input of the
mixer/amplifier, causing distortion. Conversely, if the receiver output is set too low, the overall
signal-to-noise ratio of the system may be reduced. 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 AC adapter from the AC outlet when the system is not in use.
6
System Operation
Check the frequency of the system against the chart on page 9 to ensure you have a proper
frequency for your area. Operating frequency is shown on the back panel of the receiver and on
the transmitter.
Turn down the volume control of the receiver as well as input controls on the mixer/amplifier.
Do
not
switch on the transmitter yet.
Receiver on...
Plug the AC adapter into an AC power source. The red power indicator will light.
Transmitter on...
When the transmitter is switched on, the receiver’s yellow RF signal indicator will light. The
transmitters have a 3-position power switch. When the switch is set to “Standby” (ST or ST.BY),
the transmitter produces RF with no audio signal. When the switch is “On,” the transmitter
produces both RF and audio. Maximum audio input to the transmitter will cause the receiver’s
red AF Peak indicator to light.
Receiver Squelch
The squelch control on the back panel of the receiver is preset at the factory, but can be adjusted
if you must use the system in a high RF interference area. If there is audio output from the receiver
when
your
transmitter is
off,
adjust the squelch control so the system will receive the signal from
your
transmitter but “squelch” or eliminate the unwanted background RF noise. This adjustment
can cause a reduction in useable range of the wireless transmitter, so set the control to the
lowest
position which reliably mutes the unwanted RF signals.
Input Level Adjustment
Input trimmer controls in the transmitters enable you to use microphones or guitars with different
sensitivities, or to adjust for different acoustic levels.
CAUTION!
The small trimmer controls are
delicate
; use only the supplied screwdriver.
Do
not
force the trimmers beyond their normal 260
o
range of rotation.
Return the screwdriver to its storage clip when not in use.
Adjusting Input Levels-UniPak Transmitter
Slide the battery cover off the top part of transmitter and remove the screwdriver from its clip
(Fig. B). Gently turn the “MT” (mic trimmer) and “GT” (guitar trimmer) controls to their full counter-
clockwise positions.
•
Microphone: Adjusting input level
While speaking/singing into the microphone at typically-loud levels, carefully turn the MT control
clockwise while watching the receiver’s AF Peak indicator. Increase the MT control setting until
the AF Peak indicator lights. This indicates that maximum transmitter modulation without signifi-
cant distortion has been reached.
(When using a guitar, return the MT control setting
to minimum.)
