Lectrosonics UM450 User Manual download pdf (Page 9)

Frequency Synthesized UHF Belt-Pack Transmitter

Attaching a Microphone and Adjusting Gain

1) Ensure the battery is in good condition.

2) Insert the microphone plug into the input jack, align-

ing the pins; be sure that the connector locks.

3) Attach the antenna to the SMA connector on the

top of the transmitter.

4) Mute the associated receiver’s audio output.

5) Turn on the transmitter.

6) Position the microphone in the location you will

use in actual operation. While speaking or sing-

ing at the same voice level that will actually be

used, observe the Modulation LEDs. Adjust the

AUDIO LEVEL control until the –20 dB LED glows

green with occasional red ﬂickers and -10 dB glows

green.* This will set the gain of your transmitter to

between +0 dB and +10 dB modulation. (See chart

below.)

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 *optimum

Greater than +10 dB

Red Red

7) Once the gain has been adjusted, the audio system

audio can be turned on to make level adjustments

in the main audio system.

NOTE: The transmitter 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. Adjust the

receiver output level to match the sound system or

recorder.

Operating Notes

If the audio level is too high — both LEDs will blink red

frequently or glow a steady red. This condition may

reduce the dynamic range of the audio signal.

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.

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.

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.

If you are using a receiver with a frequency scan func-

tion, ﬁnd a clear frequency with the receiver, then set

the transmitter to the frequency selected with the re-

ceiver. Simply change frequencies to one where no RF

is indicated on the receiver.

Note: Leave the transmitter turned off while you

search for a clear frequency.

The left switch changes the operating frequency by 1.6

MHz per step and the right switch changes it 100 kHz

per step. Start by changing the operating frequency

in 100 kHz increments to ﬁnd a clear channel. If it is

not possible to ﬁnd a clear channel using the 100 kHz

switch, return it to its original position and change the

1.6 MHz switch by one click then try the 100 kHz switch

again.

To gain access to these switches, slide the access door

sideways with a ﬁngernail.

With Lectrosonics 400 Series receivers, a front panel

LCD character display will indicate the correct transmit-

ter switch settings once a clear frequency has been

located with the scan function (if the receiver is so

equipped).

1.6M 100K

Rio Rancho, NM

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Lectrosonics UM450 User Manual Page 9

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