Lectrosonics MM400c User Manual download pdf (Page 12)

MM400C

LECTROSONICS, INC.

POWER

LED

Modulation

LEDs

Power On/Off

Switch

NOTE:All400Series(andanumberofearlier

receivers)offerafrontpanelLCDsthatindicatethe

correct transmitter switch settings when locating

clear channels. Use the scanning functions on

these receivers to ﬁnd a clear channel, then switch

both the receiver and transmitter to the Frequency

Select Switch settings indicated in the receiver’s

display.

If you are using a 100 Series receiver, turn off the trans-

mitter and observe the RF LED on the front panel of the

UCR100 receiver. If it ﬂickers, or glows red, then adjust

the UCR100’s Frequency Select Switches up or down in

100kHzincrementsuntiltheRFLEDextinguishes.Set

the MM400C transmitter’s Frequency Select Switches

to the same settings. Turn on the transmitter and ob-

serve that the RF LED on the receiver glows brightly.

Attaching a Microphone and

Adjusting Audio Levels

The front panel Modulation LEDs indicate limiter activity.

(Seechart.)Sincethedistortionintroducedbythelim-

iter is minimal and full modulation is assured, occasional

forays into the red by the -10 LED is acceptable.

1) Install a fresh battery.

2) Insert the watertight microphone plug into the Mic

Jack and screw it in snugly.

WARNING: Do not overtighten as this will

distort the “O-ring” and allow moisture to enter

the unit.

3) Mute the main sound system and rotate the Audio

LevelControlontheMM400Ctomaximumcounter-

clockwise(Off).

4) SetthePowerON/OFFswitchtotheONposition.

5) Position the microphone in the location where it will

be used during in actual operation.

6) ObservetheMM400CModulationLEDSwhile

speaking or singing into the microphone at

the same voice level that will be used during

the program. Gradually rotate the Audio Level

Control control clockwise until both LEDs glow

greenwiththe-20dBoccasionalblinking

red. This indicates full modulation and is the

optimum setting for the transmitter’s gain.

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

NOTE:Differentvoiceswillusuallyrequiredifferent

settings of the Audio Level 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, adjust it for the

loudest voice.

7) OncetheMM400C’saudiogainhasbeenset,the

remaining components of the audio system can be

energizedandadjusted.

WARNING: The AUDIO LEVEL control should

not be used to control the volume of your

sound system or recorder levels. This gain

adjustment matches the transmitter gain

with the user’s voice level and microphone

positioning.

Microphone Jack

Audio

Level

Control

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Lectrosonics MM400c User Manual Page 12

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