UH400A/UH400TM
LECTROSONICS, INC.
10
Operating Instructions
Attaching the Microphone
1.
Set the correct phantom power voltage for the mic.
If the mic does not require phantom voltage, set the
Phantom Voltage Select switch to 5 VDC to reduce
the possibility of damage to the mic when the trans-
mitter is powered up.
2.
Insert the UH400A into the XLR connector on the
bottom of the selected microphone. Listen for the
“click” that indicates the transmitter assembly has
locked on to the microphone. Gently pull on the mic
to ensure proper locking has occurred.
3.
Set the LEVEL control to minimum (fully counter-
clockwise).
4.
Turn on the transmitter by setting the Power Switch
to PHTM if the mic requires phantom power, or
to NO PHTM if the mic does not require phantom
power. (Refer to the specifications for the mic you
are using to determine if phantom power is re-
quired.)
5.
Position the mic as it will be used and speak into it
at the same voice level that will actually be used
during the program or production.
5.
Start with the Input Gain Control control at maxi-
mum counterclockwise, then observe the Modula-
tion LEDs next to the input coupler as you turn the
gain control up. Turn the gain up until the -20 LED
glows red and the -10 dB glows green with occa-
sional red flicker. This indicates full modulation.
The Input Gain Control on the transmitter should
not be used to control the volume of your sound
system or recording level. The control is used only
to achieve optimal modulation with the voice level
and mic position.
If the audio level is too high — both red LEDs will
glow solid red. This condition may reduce the
dynamic range of the audio signal with compression
being audible in severe cases.
If the audio level is too low — neither LED will glow,
or only the –20 LED will glow green. This condition
may cause hiss and noise in the audio.
6.
Once the gain has been adjusted, leave the gain
control where it is and adjust the receiver output
level to match the recorder or sound system.
Different voices will usually require different settings of
the gain control, so check this adjustment as each new
person uses the system. If several different people will
be using the transmitter and there is not time to make
the adjustment for each individual, It is generally best to
adjust it for the loudest voice.
Selecting the Compatibility Mode
This unit is capable of working with Lectrosonics 400
series digital hybrid receivers, 200 Series, 100 Series
and IFB analog receivers. It is also capable of working
with analog wireless receivers from other manufacturers
(contact the factory for details). Select the compatibility
mode for the matching receiver.
Note: The UH400A is supplied from the factory in
the Digital Hybrid (400 series mode).
1.
If the Power LED lights up when the Power Switch
is set to PHTM or NO PHTM, the battery is good
and correctly installed.
2.
Turn off the transmitter.
3.
With a small screwdriver (included with your unit),
set the frequency change switches to CC. (for
C
hange,
C
hange). To gain access to these switch-
es, slide the access door open with a fingernail.
TO ATTACH
TO REMOVE
Hold the
transmitter
case with the
microphone
pointed
upward.
Rotate the
collar in the
direction
shown.
Pull on mic to ensure it is locked.
Press firmly, listen for click.
Depress collar fully.
Click!
PHTM
NO PHTM
PWR OFF
LEVEL
15V
48
V
5V
INPUT
GAIN CONTROL
PHANTOM
VOLTAGE
SELECTOR
POWER SWITCH