Lectrosonics DHu, Instruction Manual

Page: 10 / 20

DHu
LECTROSONICS, INC.
10
Input Gain Adjustment
While the digital system has an excellent signal to
noise ratio over a wide range of gain adjustment, it is
still good practice to set the gain close to full modula-
tion. The two bicolor Modulation LEDs (located at the
bottom of the control panel) are used to accurately
adjust the gain. They are upside/down from the keypad
for viewing with the capsule close to your mouth.
DHu
545.400
-40 -20 0
The audio level is shown by
LEDs and in the LCD screen.
The gain should be set so that
the -20 LED just turns red on
the loudest peak (the onset of
limiting).
The LEDs will glow either red or green to indicate
modulation levels as shown in the following table.
Signal Level -20 LED -10 LED
Less than -20 dB
Off Off
-20 dB to -10 dB
Green Off
-10 dB to +0 dB
Green Green
+0 dB to +10 dB
Red Green
Greater than +10 dB
Red Red
It is best to go through the following procedure with the
transmitter in the “standby” mode so that no audio will
enter the sound system, which could cause feedback.
1) With fresh batteries in the transmitter, power the
unit on into “standby” mode (RF output off)
2)
Press the
MENU/SEL
button once to enter the
setup menu. Use the UP/DOWN buttons to select
Gain
. Press the
MENU/SEL
button again to enter
the setup screen.
3)
Hold the microphone the way it will be used in
actual operation.
4) Speak or sing at the same voice level that will
actually be used during the program, while ob-
serving the modulation LEDs. Use the UP/DOWN
buttons to adjust the gain until the
–20 dB
LED
starts to flicker red and the –10 dB glows green.
5)
Once the audio gain has been set, the signal can
be sent through the sound system for overall level
adjustments, monitor settings, etc. To do this, the
unit must be set to transmit (see Powering On
and Off
, and the
Standby Mode
).
Programmable Switch
Functions
A special button on the outside of the housing can be
configured to provide several different functions, or to
be inoperative by selecting
(none)
.
Programmable Switch
• Power
• Cough
• Mute
• (none)
• TalkBk
• PTT
The
ProgSw
button on the keypad opens a setup
screen to select the programmable switch function.
Enter this setup screen and then use the
UP/DOWN
arrows to select the desired function and press the
MENU/SEL
button to return to the Main Window.
Press the PROG/SW
button or select ProgSw
in the main menu.
PROG/SW
Button
Gain
Freq.
ProgSw
Rolloff
The
ProgSw
menu provides a scrollable list of the
available functions. Use the UP/DOWN arrows to high-
light the desired function and press
BACK
or
MENU/
SEL to select it and return to the main menu.
ProgSw
Power
Power
turns the power on and off.
Hold the button on the housing in
until the countdown sequence from
3 to 1 is completed. The power will
then be turned off.
NOTE: When the button on the housing is set
to
Power
, it will turn on the transmitter in the
operating mode with the RF output on. Use
the power button on the keypad to turn on the
transmitter in the Standby Mode.
ProgSw
Cough
Cough
is a momentary mute switch.
Audio is muted while the button on
the housing is held in.