Lectrosonics UDR195 - Manual (Page 13)

Wireless Diversity Receiver
INSTALLATION AND OPERATING INSTRUCTIONS
1) If operating the unit from AC power, determine the line voltage to be used and set the Line Voltage Selector on the rear panel
to match. The units are shipped with the proper size fuse for use with 120V systems (315mA). If the unit will be used in a
220V environment, change the fuse to a 160mA of the same type. See the section "DR195 Replacement Parts and Accesso­
ries" for manufacturer part numbers of the correct type and value for 110 and 220 Volt supplies.
2) Locate a suitable operating location where the DR195 will not be subjected to extreme temperature variations and possible
bumps and drops. Try to route all wiring so it will not cross walkways or isles.
3) Connect the power. For 120V AC operation, connect the power cord to the AC input jack on the rear panel and plug the other
end into a suitable electrical outlet. If 12 to 18 Volts DC operation is desired, a power cord will need to be fabricated. Use a
standard A4M XLR connector for the DR195 end and wire the 12 to 18 VDC to pins 1 and 4. The DR195 will operate with
either polarity. Make the length of the DC cable long enough to suit your installation and prepare and connect the source end
of the cable.
4) Attach the antenna cables to the BNC jacks on the rear of the DR195 and place the antennas. Best performance will be
obtained if the antennas are placed at least 3 feet from each other. Try to mount them as high as possible with a direct line of
sight path to the transmitter.
5) Set the Audio Output level control to minimum (CCW) and connect the Audio Output XLR jack to the mixer input. Pins 2
and 3 of the XLR jack are HI and LO and can be reversed with the Phase switch, pin 1 is common.
6) Preset the following controls: MODE (front panel) to DIVERSITY
MONITOR (front panel) to minimum (CCW)
PHASE (rear panel) to UP
VU METER HEADROOM (rear panel) to 0
AUDIO OUTPUT (rear panel) to -40 (full CCW)
7) Turn the unit on with the front panel Power switch and check to see that the red Pilot LED is off (be sure the transmitter is
turned off.) The VU meter will be lit only when the unit is operated from 120 VAC.
8) Turn on the transmitter and adjust the transmitter gain. THIS IS PERHAPS THE MOST IMPORTANT STEP IN THE SET
UP PROCEDURE. Adjust the transmitter so that voice peaks will light the 0 LED on the DR195 front panel Transmitter
Audio Level dB strip. The red LIM LED may flash occasionally. This is normal but it should not happen very often. See
your transmitter manual (Operating Instructions section) for specific directions on how to adjust the gain of your particular
transmitter.
9) After adjusting the transmitter gain, set the rear panel Audio Output level control to the desired level. The -40 setting is
approximately equal to 10mV, the 0 position will give 0.775VRMS, and the +15 setting will allow up to 4.4 VRMS. This
setting will depend on the requirements of your system.
10) Operate the system and re-adjust the receiver output level as required for your equipment. The input levels on different
VCR’s and PA equipment vary, which may require that you set the OUTPUT ATTENUATOR control in an intermediate
position. Try different settings and listen to the results. If the output of the receiver is too high, you may hear distortion or a
loss of the natural dynamics of the audio signal. If the output is too low, you may hear steady noise (hiss) along with the
audio.
11) Once the transmitter and Audio Output level has been set, you may adjust the VU Meter Headroom on the rear panel so the
analog VU meter will swing to 0 on normal audio peaks. The Headroom control is calibrated 0 to 20 dB in 5 dB steps so it is
always possible to know what the VU meter is actually measuring. For instance, if the VU meter is indicating 0 with a steady
state audio tone and the Headroom control is set to "5", the audio output is -5 dBu. The Headroom switch actually adjusts the
sensitivity of the VU meter by a calibrated amount. Without it, the VU meter would not deflect at all if the Audio Output was
set to a low setting such as –30.
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