Lectrosonics Inc UH400E Manuel D’Utilisation

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 

Change, Change).  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.

PHTM

NO PHTM

PWR OFF

LEVEL

15V

48

V

5V