Telex Setting System Gain Levels, Adjusting Gain, BTR-300 Base Station, TR-300 Portable

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.

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.

INCREASE

CAUTION

D O N O T r e m o v e

this plug or attempt

to adjust. This beltpack

has been precisely tuned

Telex EV/

REMOVE BELT CLIP

	and any attempt to alter
Telex /	this adjustment will result
	in a non-operational unit.
EV

BTR 300

Mic On Push Twice to Latch

DECREASE

GAIN

REMOVE THIS RUBBER PLUG FOR ACCESS TO THE MICROPHONE GAIN CONTROL

OVERMODULATION

INDICATOR

bat/ talk ovmod

Figure 34	Figure 35
Adjusting Microphone Gain - BTR-300	Adjusting Microphone Gain - TR-300
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