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SETTING SYSTEM GAIN LEVELS
ADJUSTING GAIN
The gain may need to be adjusted for various
audio conditions. The overmodulation light
will indicate when the gain is too high. If the
light is illuminated when you are talking, the
gain is too high and will need to be decreased.
If the light does not flash at all, and the audio
is low, the gain may need to be increased. An
occasional flash of the overmodulation indica-
tor is fine.
Using a plastic screwdriver (supplied), adjust
the control clockwise to increase the gain or
counterclockwise to decrease the gain. Note
that the gain can also be adjusted by changing
the spacing between the microphone and your
mouth.
Figure 34
Adjusting Microphone Gain - BTR-300
BTR-300 BASE STATION
The microphone overmodulation indicator
light for the BTR-300 headset can be found on
the right side of the front panel. The micro-
phone gain control potentiometer is located to
the left of the indicator light.
TR-300 PORTABLE
The overmodulation circuitry in the TR-300
uses the same light as the low battery cir-
cuitry. If modulation is too high this light will
illuminate when talking.
If the gain needs to be adjusted, remove the
belt clip on the rear of the unit and pry out the
small rubber plug to the right of the screw
boss. This will reveal the microphone gain
control potentiometer. Once adjusted, replace
the rubber plug.
Figure 35
Adjusting Microphone Gain - TR-300
-28-
BTR-300
Mic On Push Twice to Latch
OVERMODULATION
INDICATOR
INCREASE
DECREASE
bat/
ovmod
talk
DO NOT remove
this plug or attempt
to adjust. This beltpack
has been precisely tuned
and any attempt to alter
this adjustment will result
in a non-operational unit.
OVERMODULATION
INDICATOR
OVERMODULATION
INDICATOR
CAUTION
REMOVE THIS RUBBER
PLUG FOR ACCESS TO
THE MICROPHONE GAIN
CONTROL
REMOVE BELT CLIP
GAIN
Telex / EV
Telex / EV