Lectrosonics T195 User Manual download pdf (Page 8)

OPERATING INSTRUCTIONS

1) Install a fresh battery according to the instructions on page 5. Leave the battery cover off for further adjustment.

2) Set the internal bypass slide switches so that the battery status LED and the bottom panel switches will operate.

3) On the bottom panel, move the “A” (audio) switch to “OFF” and the “P” (power) switch to ON (in that order).

Observe that the battery status LED is brightly lit. If the LED is dim, replace the battery.

4) Hold the microphone in the same position that will be used in actual operation.

5) While speaking or singing at the same voice level that will be actually used, observe the MOD LEVEL LEDs next

to the battery compartment. Adjust the AUDIO LEVEL control knob until the LEDs begin to light. Start at a low

setting where neither LED lights as you speak. Gradually, turn the gain up until one LED lights, then the other.

The first LED lights when the audio level is about 10 dB below full modulation. The second LED lights when the

limiter begins to operate. There is 30 dB of headroom above the limiter LED and it is normal that it lights up

occasionally during use.

If you find that the AUDIO LEVEL control is set to minimum and the LIMIT LED is still on often, then set the –10

dB switch to the –10dB position. This switch is located under the windscreen. Unscrew the windscreen and

carefully lift it off the top of the unit. Orient the unit so that the “–10 dB” label is toward you. In this position, when

the switch handle is pushed toward the label, the 10dB pad is enabled. The unit is set to disable the 10 dB

attenuator at the factory (switch handle pushed away from the label.)

6) Once the gain has been adjusted, the transmitter audio can be turned on to make sound system level adjust-

ments. Set the “A” (audio) switch to ON position and adjust the receiver and/or sound system level as required.

Please note, there will be a delay between the moment the switch is thrown and the time when audio will

actually pass through to the amplifier. This intentional delay eliminates turn on thumps, and is controlled by

the pilot tone squelch control.

OPERATING NOTES

The AUDIO LEVEL control knob should not be used to control the volume of your sound system. This gain adjust-

ment matches the transmitter gain with the user’s voice level and microphone positioning.

If the mic level is too high - both LEDs will light frequently or stay lit. This condition may cause distortion.

If the mic level is too low - neither LED will light, or the LEVEL LED will light dimly. This condition may cause hiss

and noise in the audio.

The first LED turns on at -10dB below full deviation. The limiting LED turns on at full deviation and indicates that the

input shunt compressor is operating. The input compressor operates over a full 20dB range regardless of the gain

control setting. The compressor uses a true absolute value circuit to detect both positive and negative peaks. The

attack time is 2 milliseconds and the release time is 80 milliseconds. Occasional limiting is desirable, indicating that

the gain is correctly set and the transmitter is fully modulated for optimum signal to noise ratio.

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.

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Lectrosonics T195 User Manual Page 8