as you speak. Gradually, turn the gain up until one LED lights, then the other.
The LEVEL LED lights when the audio level is about 12dB below full modulation. The LIMIT LED lights when the
limiter begins to operate. There is over 30dB of limiting range without overload above the LIMIT LED, so it is
normal that the LIMIT LED light up 5% to 10% of the time during use.
7) Once the gain has been adjusted, the transmitter audio can be turned on to make sound system 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 pass through to the amplifier. This intentional delay eliminates turn on thumps, and is
controlled by the pilot tone squelch control.
OPERATING NOTES
The MIC 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 mic 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 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, or pumping and breating in the background noise.
The first LED turns on 12dB below full deviation. The limiting 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 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. 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 MIC 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.
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 sideways 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.
With the UDR200B receiver, the front panel LED character display will indicate the correct transmitter switch settings.
9
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