5
5
System Operation
Turn down the AF Level of the receiver as well as the mixer.
Switch on the receiver only. Do
not
switch on the transmitter
yet.
Receiver On…
The power indicator will light up and one of the diversity indi-
cator LEDs (A or B) will light, even though the transmitter is
not on. If any of the RF LEDs light up at this point, there may
be RF interference in the area, or a nearby TV station is on
the same frequency. Check the frequency of the system
against the chart on page 7 to ensure you have the proper
frequency for your area. The frequency is marked on the back
panel of the receiver.
Transmitter On…
When the transmitter is switched on and in normal operation,
the receiver’s RF signal level indicators will light up from left
to right. For optimum performance at least four, and preferably
five, of the signal strength indicators should light up when the
transmitter is switched on. The transmitters have a three-
position power switch. When the switch is set to “Standby,”
the transmitter produces RF with no audio signal. When the
switch is “On,” the transmitter produces both RF and audio.
With the switch “Off” there is minimum noise output due to
a special A-T muting system.
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 an area with considerable RF interference. 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 will “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 that reliably mutes the
unwanted RF signals.
UniPak Input Level Adjustment
Trimmer adjustments in the UniPak transmitter (Fig. K) will
enable you to use microphones with different output levels
or guitars that have built-in preamps. To adjust microphone
(Lo-Z) input levels,
gently turn the “M” (mic trimmer) control
to the full counter-clockwise position. Plug in the mic and
power up the system. Increase the adjustment until the
maximum
audio output of the mic lights about three or four
LED units on the receiver’s AF Level indicator. Do
not
set the
level too high (indicated by the red LED lighting). At normal
audio levels, only the first two or perhaps three LEDs
(80-92-106 dB) should light on peaks. During normal speech
only the first LED may light.
Follow the same procedure when using the guitar (Hi-Z) input,
adjusting the “G” (guitar trimmer) control to set the
transmitter’s audio input level.
The input control not in use should be set to minimum.
CAUTION! The small trimmer controls are
delicate
; use a
small screwdriver or alignment tool with a maximum
3
/
32
"-wide
blade. Do
not
force the trimmers beyond their normal 180°
range of rotation.
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 no closer
together than three feet.
4. The receiver antennas should be in the open and
away from any metal. If mounted in a rack, have the
unit on top, or angle antennas outward away from the
metal rack.
5. A receiver cannot receive signals from two
transmitters at the same time.
6. The power switch on the transmitter has three
positions: “Off,” “Standby” and “On.” In the middle
“Standby” position, the transmitter sends only RF to
the receiver; the audio source is turned off.
7. For best operation, all the RF Level LEDs should be
lit (maximize RF input); but only the first two or three
AF Level LEDs should be lit (don’t overmodulate).
8. If the AF Level control of the receiver is set too high,
it may over-drive the input of the mixer or clip the
output of the receiver, 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
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. In the UniPak transmitter, the “M” or “G” input
control not in use should be set to minimum.
10. Turn the transmitter off when not in use. Remove the
battery if the transmitter is not to be used for a period
of time.
Microphone
Trimmer (M)
Guitar
Trimmer (G)
Fig. K
