Lectrosonics MM400a - Manual User Manual download pdf (Page 10)

MM400A

with the number of blinks listed in Step 1.

The mode setting will remain the same until

you reset it with the procedure listed above.

ADJUSTING THE TRANSMITTER

FREQUENCY

If you are experiencing interference from another signal

on your frequency, you may want to change the operat-

ing frequency of your system. The left switch (COARSE)

changes the operating frequency by large increments

and the right switch (FINE) changes it in small incre-

ments. If you are experiencing interference, change the

operating frequency in fine steps to find a clear channel.

If it is not possible to find a clear channel using the Fine

switch, return it to its original position and change the

Coarse switch by one click then try the Fine switch again.

Lectrosonics 400 series receivers have a built-in fre-

quency scanner which makes finding a clear channel

very easy. See the separate receiver manual for instruc-

tions.

To gain access to these switches, unscrew the retaining

bolt that holds the access door to the case. It is not

necessary to remove the bolt from the case since it is

retained by the case with enough room to still remove

the access door. Pull the access door away from the

case and swing the door to the side to gain access to the

frequency switches.

Frequency Select Switch Cover

Frequency Select Switches

Battery Compartment Cover

ATTACHING A MICROPHONE AND

ADJUSTING GAIN

The front panel Modulation LEDs indicate limiter activity.

At -20 dB, the -20 LED glows green. At -10 dB, both the

-20 and the -10 LEDs glow green. At 0 dB, the -20 LED

glows red and the -10 LED glows green, and at +10 dB,

both LEDs glow red. Since the distortion introduced by

the limiter is minimal and full modulation is assured,

occasional forays into the red by the -10 LED is accept-

able.

Generally speaking, some limiting is acceptable in

normal operation to improve the signal to noise ratio of

the system. The limiting action is not audible and does

not create distortion. A highly trained ear would hear

only the compression of the peaks in the audio signal,

which is desirable with most recorders and many sound

reinforcement systems.

1) Insert the watertight microphone plug into the

Micorphone Input Jack and screw it in snuggly.

Mic Input Jack

Antenna SMA Connector

Watertight Connector for

Microphone

3) Mute the main sound system and rotate the Audio

Level Control on the MM400A to maximum coun-

terclockwise (Off).

4) Insert the battery to turn on the transmitter

5) Position the microphone in the location where it

will be used in actual operation.

6) Observe the MM400A Modulation LEDS while

speaking or singing at the same voice level that

will be used during the program. Gradually rotate

the AUDIO LEVEL control clockwise until the -20

LED glows red and the -10 dB glows green with

occassional red flickers. This flikcer indicates full

modulation and is the optimum setting for the

transmitter’s gain.

–10

–20

POWER

Audio Level Control

Modulation LEDS

Power LED

7) Once the MM400’s audio gain has been set, the

remaining components of the audio system can be

energized and adjusted.

LECTROSONICS, INC.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

Comments to this Manuals

No comments

Lectrosonics MM400a - Manual User Manual Page 10

Comments to this Manuals

Related products and manuals for Accessories communication Lectrosonics MM400a - Manual