Lectrosonics UH200c - Manual (Page 5)

Frequency Agile Plug-on UHF Transmitter
OPERATING INSTRUCTIONS
1) Insert the UH200C into the selected microphone. Listen for
the “click” that indicates the UH200C has locked on to the micro­
phone. Pull on the mic to insure proper locking has occurred.
TO ATTACH
TO REMOVE
Pull on mic to insure locking.
Press firmly, listen for click.
Depress collar fully.
Hold the
transmitter
case and
rotate the
collar in the
direction
shown. Do
this over a
soft surface
as the
microphone
may pop off
suddenly
Attaching the Microphone
2) Turn the power switch to the “MUTE” position.
3) Hold the microphone as you will when you will be using it.
4) Position the microphone in the location you will use in actual
operation.
5) While speaking or singing at the same voice level that will
actually be used, observe the MODULATION LEDs. Adjust the
AUDIO LEVEL control knob until the LEDs begin to light. Start
at a low setting where neither LED lights as you speak. Gradu­
ally, turn the gain up until one LED lights, then the other.
The -20 LED lights when the audio level is about 20dB below full
modulation. The “0” LED lights when the limiter begins to
operate. There is over 30dB of limiting range without overload
above the “0” LED, so it is desirable that the it lights up occasion­
ally during use.
6) Once the gain has been adjusted, the audio system audio can
be turned on to make level adjustments. Set the power switch to
the 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 appear at the receiver output. 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 or recorder levels. This gain
adjustment matches the transmitter gain with the user’s voice
level and microphone positioning.
If the audio level is too high -- both LEDs will light frequently or
stay lit. This condition may reduce the dynamic range of the
audio signal.
If the audio level is too low -- neither LED will light, or the -20
LED will light dimly. This condition may cause hiss and noise in
the audio, or pumping and breathing in the background noise.
The first LED turns on 20dB below full deviation. The “0” LED
turns on at full deviation and indicates that the input shunt
compressor is operating. The input limiter will handle peaks
over 30dB above full modulation, regardless of the gain control
ADJUSTING THE TRANSMITTER
FREQUENCY
If you are experiencing interference from another signal on your
frequency, you may want to change the operating frequency of
your system. The left switch changes the operating frequency
by 1.6 MHz per step and the right switch changes it 100 kHz per
step. If you are experiencing interference, change the operating
frequency in 100 kHz steps to find a clear channel. If it is not
possible to find a clear channel using the 100 kHz switch, return
it to its original position and change the 1.6 MHz switch by one
click then try the 100 kHz switch again.
0 1
2
3
4
5
6
7 8 9
A
B
C
D
E
F 0 1
2
3
4
5
6
7 8 9
A
B
C
D
E
F
To gain access to these switches, slide the access door side­
ways with a fingernail.
Note: With the UDR200A receiver, these switches also appear
on the front panel of the receiver. Normally, you should set the
transmitter switches to match the receiver switch settings. The
switches are located on the rear panel of the UCR200D
receiver.
With the UDR200B receiver, the front panel LED character
display will indicate the correct transmitter switch settings.
setting. The limiter uses a true absolute value
circuit to detect both positive and negative
peaks. The attack time is 5 milliseconds and
the release time is 200 milliseconds. Occa­
sional 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.
Rio Rancho, NM – USA 5