Lectronics 100 System Setup Procedure

100 Series

Wireless Microphone System

SYSTEM SETUP PROCEDURE

Rio Rancho, NM, USA
www.lectrosonics.com

100 Series

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Step 1: Install Batteries

Use fresh alkaline or lithium 9 Volt batter­ies. In all cases, observe large and small
battery contact openings inside the unit
and orient the battery accordingly prior to
inserting in the battery compartment.

LM transmitter

Push outward on
bottom then rotate
to open.

UH400A transmitter

Slide battery door
out then swing open.

After installing the battery,
turn the unit on and check
to see that the Power LED

UCR100

Power LED

UCR100 receiver

Push outward on bottom
then rotate to open.

UH400A Power LED

LM

Power LED

is brightly lit.

Important Note: Before using transmitters with the UCR100 Receiver, make
sure they are set to 100 Series Compatibility Mode. Refer to your transmitter’s
manual for instructions on how to change compatibility modes.

Step 2: Check for Interference and Select a Clear Frequency

Turn all transmitters OFF. Turn the UCR100 ON. Slide open the door to expose the frequency select switches.
Set the 100 kHz switch to “8.” Rotate the 1.6 MHz switch to a position where the green RF LED on the front
panel does NOT light up. Then, rotate the 100 kHz switch a few detents above and below where it was origi­nally set while observing the RF LED. The idea is to find switch settings
where the RF LED does not light up, which will be a clear operating
frequency.

NOTE: Video cameras often generate a
significant amount of RF noise (interference).
Mount the UCR100 on the camera or in the
position it will actually be used with the audio
cable connected, and check the green RF LED
again to see if interference is present. If the RF
LED on the receiver remains lit when the transmitters
are turned off, find new switch settings or re-position the receiver.
The RF LED should extinguish when the associated transmitter is turned off.

Step 3: Set Transmitter Frequency

Set the frequency selection switches on the side of the transmitter
to match the switches on the receiver determined in Step 2.
Ensure the transmitters are oriented so the
word “Frequency” reads correctly to orient the
left and right hand switches.

2

RF LED

Frequency Switches

1.6MHz
(left)

100KHz

(right)

Frequency Switches

1.6MHz 100KHz

UH400A

LM

LECTROSONICS, INC.

Wireless Microphone System

Step 4: Microphone Attachment – Belt-Pack Transmitters

Rotate the 5-pin plug to align

LM

A 5-pin jack on the transmitter
control panel provides input
taps for any microphone.

with the pins in the jack on the
transmitter. Insert the plug until
it latches in place.

Press the black button to re­move the plug from the trans­mitter.

Step 5: Microphone Attachment – Plug-On Transmitters

The connector fits standard
3-pin XLR jacks. A spring­loaded collar on the trans­mitter adapts to provide a
secure fit on a wide variety
of different microphones.

Step 6: Adjust Transmitter Gain

Adjust the gain while speaking into the microphone and
observing the LEDs on the transmitter and/or the re­ceiver.

Adjust the level control so that the “-10” LED blinks green
or stays lit during normal speech and the “-20” LED oc­casionally blinks red on louder peaks.

Signal Level -20 LED -10 LED

Less than -20 dB Off Off

-20 dB to -10 dB

-10 dB to +0 dB

+0 dB to +10 dB

Greater than +10 dB

Green Off

Green Green

Red Green (optimum)

Red Red

LM and UH400A

AUDIO LEVEL

Control

Modulation

LEDs

Warning: This is a critical adjustment to
optimize the audio performance.

Step 7: Set Camera or Mixer Audio Level Control to a Comfortable

Midrange Position

NOTE: This step only applies to cameras and camcorders that offer manual audio level control during
recording. If your camera or camcorder offers AGC (automatic gain control) only, skip this step and go to
step 8.

Set the manual input level control on the camera or mixer to a point just above the middle of the control
range (i.e. set it at “7” on a scale of 1 to 10).

Rio Rancho, NM

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581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
[phone] • [phone] • fax [phone] • [e-mail]

Step 8: Adjust UCR100 Output for Proper Record Level

For cameras or mixers with manual level control

Attach a receiver output cable (see below) between the UCR100 and the
camera or mixer. Leave the camera or mixer audio level control in the same
position as set in Step 7. While speaking into the transmitter microphone at
the same level that will be used in the program, adjust the UCR100 output
LEVEL control for the correct input level for the camera or mixer.

If a correct input level to the camera or mixer cannot be achieved using the
UCR100 output LEVEL control, set the UCR100 output level as close as
possible to the correct level, and then adjust the input control slightly on the
camera or mixer. A peak in the audio signal should cause the -20 LED on the
UH400A or LM transmitters to blink red and occasionally light the “0” LED on the
UCR100 receiver. It should also show a “0 VU” indication on the camera or mixer.

For cameras with AGC (automatic gain control) only

It is always better to set the audio record level manually if possible; however, if manual control is not offered
on your camera, the wireless system can still be used, but the audio output of the UCR100 must be set by
listening rather than using the LEDs. This will reduce the “breathing” effect on the audio caused by the AGC
(automatic gain control).

Have the talker pause for 5 or 6 seconds after speaking, and listen for a buildup of background noise during
the pause. When the talker begins speaking again, the background noise will be buried by the talker’s voice
until the next pause in speech occurs. The noise buildup is caused by the AGC circuit in the camera trying to
adjust for a constant level. It is not the fault of the wireless system. Manually adjust the UCR100 output level
control to minimize the “breathing” effect (generally a lower setting).

Output LEVEL

Control

Receiver Output Cables

MC100RCA

- 3.5mm male

TRS (stereo) plug
to two male RCA
plugs

MC100TRS

- 3.5mm TRS

(stereo) straight
plug to 3.5mm
TRS (stereo) right
angle plug

MC100XLR - 3.5mm

mono plug to male
XLR unbal; pin 2 (+)
with pins 1 and 3
jumpered; 100 ohm
resistor

MC55 - 3.5mm mono

mini plug to XLR male;
15” long; converts
unbalanced line level
to balanced mic level;
45dB attenuator;
built-in caps bypass
phantom power

Step 9: Walk Test / Voice Test

Always conduct a walk test before each use, since it is impossible to predict all potential sources of wireless
problems. Turn on the camera, the wireless and any other electronics that will be used. Have the talker (with
transmitter) walk through the areas while speaking where the wireless system will actually be used. Listen to
the audio quality while the talker makes this walk test. If the facility (worship center, conference room, hotel,
etc.) will also be using a wireless system while your system is operating, make sure that system is also turned
on and operating during your walk test.

May 8, 2007