Lectrosonics UDR200a User Manual download pdf (Page 7)

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 “UDR200 Replacement

Parts and Accessories” for manufacturer part numbers of the

correct type and value for 110 and 220 Volt supplies.

2) Locate a suitable operating location where the receiver will

not be subjected to extreme temperature variations and pos-

sible 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 14 Volt DC

operation is desired, a power cord will need to be fabricated.

Use a three-pin connector for the UDR200 end and wire the

+12 to pin 2, –12 to pin 3, and Gnd to pin 1. 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

UDR200 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 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.)

8) Turn on the transmitter and adjust the transmitter gain. This

is perhaps the most important step in the setup proce-

dure.

Adjust the transmitter so that voice peaks will light

the 0 LED on the UDR200 front panel Transmitter Audio

Level dB strip. The red LIM LED on the transmitter may

flash occasionally. This is normal but it should not happen

very often. See your transmitter manual (Operating Instruc-

tions 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 Audio Output 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) Set the operating frequency. 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 interfer-

ence, 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.

To gain access to these switches, slide the access door up with

a fingernail.

The UDR200 is frequency agile within the 5 MHz passband

of the front-end filters. It is possible to choose a frequency

that is outside the passband of the front-end filters. Reduced

operating range and increased noise can result if the receiver

is operating outside of its range.

We recommend that you never set the 1.6MHz switch more

than one click from the default position

Each receiver is factory aligned at the center of its operating

range. The default position of the frequency select switches

is in the center of the receiver passband.

Figure 4 - Frequency Select Switches, Default Position

Rio Rancho, NM – USA

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Lectrosonics UDR200a User Manual Page 7

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