System Operation
Switch on the receiver. Do
not
switch on the transmitter yet.
Receiver On…
The LCD display will light up and one of the tuner operation
indicator LCD segments (A or B) will light, even though the
transmitter is not on. If two or more of the RF LCD segments
light up at this point, there may be RF interference in the area.
If this occurs, change operating channels (select another
frequency).
How to Make Operating Channel Changes
Operating channel changes (frequency changes) may be made
in two ways: manually and automatically.
To change channel manually
1. Use the Up/Down arrow buttons to reach the desired
channel number.
2
Hold the Set/Scan button until the channel number stops
flashing to set the receiver to the channel indicated.
NOTE: Before the channel has been set, a touch
(momentary press) of the Set/Scan (rather than a hold) will
revert the channel to its previous setting.
To change channel automatically
1.
Hold the Set/Scan button. The Automatic Scan/Set Mode
will automatically scan for and set the next open channel.
LCD screen will flash “FS” four times to indicate start of
scan.
Transmitter On…
Before turning on the transmitter, use the provided screwdriver
to set the transmitter channel selector switches (Fig. E/I) to the
same numbers as those displayed on the receiver. Always turn
the transmitter off when changing channels (frequencies).
The transmitters have a two-position, on-off power switch.
When the switch is “On,” the transmitter produces both RF
and audio.
There is about a half-second delay after the transmitter is
switched to the “On” position before the receiver’s Tone Lock
squelch un-mutes the receiver.
When the transmitter is switched on and in normal operation,
the receiver’s RF signal level indicators will display as dark
segments (signal strength indicators) from bottom to top at the
left side of the LCD display.
Setting Levels
Correct adjustment of transmitter audio input, receiver audio
output, and mixer/amplifier input and output levels is important
for optimum system performance.
ATW-T220 Handheld Transmitter
The 2000 Series handheld transmitter has factory pre-set audio
input levels. Factory setting is full clockwise, maximum gain.
While speaking/singing into the microphone at typically loud
levels, check the AF meter levels on the receiver. If all five AF
meter bars are consistently illuminated and distortion is heard
through the system, it may be necessary to adjust the
transmitter audio input level.
To adjust the transmitter audio input level, unscrew the lower
body cover and slide it downwards, exposing the screwdriver
and level trim control (Fig I). Remove the screwdriver and gently
turn the level trim control counterclockwise until the topmost
receiver AF level meter bar is illuminated only on audio peaks.
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 180° range of rotation.
Return the screwdriver to its storage clip when not in use.
MAX
CH
LEVEL
1
3
5
7
9
Figure I-Handheld Transmitter Interior View
Channel
Selector
Switch
Level Trim Control
7
Screwdriver
