Lectrosonics UH190 - Manual (Page 5)

Plug-on Transmitter
OPERATING INSTRUCTIONS
1) Insert the UH190 into the selected microphone. Listen for the “click” that indicates the UH190 has locked on to
the microphone. Pull on the mic to insure proper locking has occurred.
2) Turn the power switch to the “MUTE” position on both the transmitter and the receiver. The “MUTE” position
allows internal voltages to stabilize before audio signal paths are opened.
3) Hold the microphone as you will when you will be using it.
4) Speak as loudly as you expect to speak in normal system use. Rotate the MIC LEVEL knob so that the LEVEL
LED flickers or stays lit as you speak. The LIMIT LED should light up on loud “peaks.” Occasional lighting of the
LIMIT LED (about 10-15% of the time) indicates proper operation and optimum signal-to-noise ratio. Even when
the transmitter is limiting, little distortion is produced because of the high linearity of the gain control circuit in the
UH190.
5) Move switches to “ON” position on both the transmitter and the receiver and adjust the volume of the
sound system.
NOTE:
The MIC LEVEL control should not be used to control the volume of your sound system. This is accomplished using
the level control on the receiver, or a level control on the mixing console.
If the mic level is too high - the LIMIT LED will light frequently or stay on. This condition may cause distortion.
TO ATTACH TO REMOVE
PULL ON MIC TO INSURE LOCKING
PRESS FIRMLY, LISTEN FOR CLICK
DEPRESS COLLAR FULLY ROTATE
COLLAR
If the mic level is too low - neither LED will light, or the LEVEL LED will light dimly. This condition will cause hiss and
noise. You may experience severe reduction in apparent range if the modulation level is too low. It may sound as if
you are getting dropouts. What is actually happening is that you are hitting your noise floor because the S/N ratio
has been compromised by the low modulation.
The LEVEL LED turns on at -12dB below full deviation. The LIMIT LED turns on at full deviation and indicates that
the input shunt compressor is operating. The input compressor operates over a full 30dB 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.
Rio Rancho, NM – USA 5