User's Manual

Compact Portable Receiver
Rio Rancho, NM
15
3) Prepare the signal source. Position a microphone
the way it will be used in actual operation and have
the user speak or sing at the loudest level that
will occur during use, or set the output level of the
instrument or audio device to the maximum level
that will be used.
4) Use the and arrow buttons to adjust the gain
until the –10 dB glows green and the –20 dB LED
starts to flicker red during the loudest peaks in the
audio.
5) Once the transmitter input gain has been set, the
signal can be sent to the sound system or recorder
for level adjustments, monitor settings, etc.
6) Do not use the transmitter input gain control to
adjust the audio output level of the receiver.
Other Transmitters:
Earlier Lectrosonics transmitters provide LEDs to ac-
curately indicate full modulation, with continuously vari-
able gain controls for a precise adjustment. The LEDs
operate in the same manner as those shown here for
transmitters with an LCD interface.
The UM400A transmitter shown below is typical of
many legacy Lectrosonics models.
LECTROSONICS
UM400a
OFF
ON
AUDIO
LEVEL
–10
–20
ANTENNA
Input gain
control
Modulation
level LEDs
Some transmitters from brands other than Lectroson-
ics can also be used if the appropriate compatibility
mode set is set in the receiver. Observe the audio level
meter on the LR receiver LCD as you adjust the input
gain on the transmitter to see the modulation level.
Some models may have limiters on the input to sup-
press overload distortion, and others may not. Monitor
the audio, preferably with headphones, as you adjust
the input gain to find the maximum level that can be
set without audible limiting or overload distortion.
7) Set Receiver Audio Output Level
The audio output can be adjusted from -50 dBu (mic
level) to +5 dBu (line level) in 1 dB steps. It is best to
use an output level high enough to drive the connected
device to an optimal level without the need for addition-
al gain. If the receiver is set to full output and the level
is still not sufficient to drive the connected device to an
optimal level, then some gain will need to be applied
by the connected device.
A built-in tone generator makes matching the output
level to the connected device easy and accurate.
1) Navigate to Audio Level in the LR receiver menu
and press MENU/SEL to enter the setup screen.
Use the arrow keys to reduce the level to minimum
(-50 dBu).
2) Turn on the 1k tone (MENU/SEL + UP arrow) in
the Audio Level setup screen.
3) On the connected device, set the input to “line
level” if available. Turn the input gain control (e.g.
record level) all the way down.
4) Gradually increase the output level on the receiver
while observing the input level meter on the con-
nected device. Increase the level until the input
level meter indicates 3 or 4 dB below maximum.
This “optimal level” will protect against overloading
the input with a very loud peak in the audio.
5) If this optimal level cannot be achieved, even with
the receiver output turned all the way up, increase
the input gain control on the connected device
gradually until this level is achieved.
Once this level match has been set, leave these set-
tings alone and make adjustments from one event to
another with the input gain control on the transmitter.
Tuning Groups
For quick, convenient access to predetermined groups
of frequencies, four user customizable groups, U,V, W
and X, are available, and can each hold up to 32 chan-
nels.
Activitating a Tuning Group
1) Navigate to Group on the menu and press MENU/
SEL to enter the setup screen.
2) Use the UP and DOWN arrows to scroll through
the options, None (Default), U, V, W or X. Choose
the desired tuning group and press MENU/SEL to
return to the menu.