Lectrosonics FM875 User Manual download pdf (Page 10)

OPERATING INSTRUCTIONS

This section covers the initial adjustments to the FM875 and the companion transmitter that must be made

before the system is placed into operation:

1) Connect the audio output cable as required. If you are connecting into a "house" sound system or

external audio or recording equipment, make those connections before turning on the power.

2) Turn both volume controls on the FM875 control panel to minimum (fully counter-clockwise).

3) Set the power switch to ON. Verify that the POWER lamp lights.

4) Position yourself behind the FM875 (or sound system speakers) so that the sound from the speaker

output will be directed away from the microphone.

5) Plug your microphone into the transmitter. Rotate the plug clockwise to make sure the connection is

locked. Do not over-tighten the plug.

6) Turn the transmitter power on and verify that the red light on it lights. If the lamp is very dim or does

not light, replace the battery.

7) Observe that the RF lamp on the FM875 control panel is lighted. This verifies that the unit is receiving

a useable signal from the transmitter.

8) Position the microphone on your person in the same location it will be in during actual operation. The

microphone should ideally be within 6 to 10 inches from the mouth to minimize "feedback".

9) A small screwdriver is supplied with the transmitter. The screwdriver is used to adjust the audio gain

of the transmitter to match the microphone with your voice. The adjustment is made while observing

the MODULATION lamps on the FM875 control panel as shown in the figure on page 10.

10) Speak at the voice level you will be using during actual operation. While speaking, adjust the

transmitter gain until the -20 lamp is lighted or flickers and LIMIT lamp blinks only on the loudest

words. Raise and lower your voice while observing the lamps. The LIMIT lamp should only blink

occasionally.

11) You may now adjust the WIRELESS MIC VOLUME control to a level which will allow everyone in the

audience to hear clearly.

REMEMBER--the transmitter gain control is used only to adjust for proper MODULATION lamp indications.

DO NOT use it to adjust the output volume of the FM875. Different voices and different microphones will

usually require readjustment of the transmitter gain control, so check the adjustment frequently. If several

different people will be using the system and there is not time to make the adjustment for each individual,

adjust it for the loudest voice.

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Lectrosonics FM875 User Manual Page 10