Lectrosonics UDR200a User Manual

RARA

RA

RARA

TIOTIO

TIO

TIOTIO

UDR200AUDR200A

UDR200A

UDR200AUDR200A

DIVERSITYDIVERSITY

DIVERSITY

DIVERSITYDIVERSITY

RECEIVERRECEIVER

RECEIVER

RECEIVERRECEIVER

Wireless Diversity Receiver

OPERAOPERA

OPERA

OPERAOPERA

and trouble-shooting guideand trouble-shooting guide

and trouble-shooting guide

and trouble-shooting guideand trouble-shooting guide

LECTROSONICS, INC.LECTROSONICS, INC.

LECTROSONICS, INC.

LECTROSONICS, INC.LECTROSONICS, INC.

TING INSTRTING INSTR

TING INSTR

TING INSTRTING INSTR

Rio Rancho, NMRio Rancho, NM

Rio Rancho, NM

Rio Rancho, NMRio Rancho, NM

UCTIONSUCTIONS

UCTIONS

UCTIONSUCTIONS

Rio Rancho, NM – USA

1

A little bit of Lectrosonics history...

Founded in 1971, Lectrosonics began with the manufacture of portable
sound systems sold under the Voice Projector© registered trademark. The
first product line consisted of a self-contained lectern/sound system and two
over-the-shoulder portable sound systems.

In 1975 the first wireless microphone systems were introduced to audio
visual markets. The first system was a lavalier system consisting of a belt­pack transmitter and matching receiver. Soon after this, the receiver was
equipped with a rechargeable battery pack to allow it to be used with the
portable sound systems. A year or so later a special version of the receiver
was designed to be built inside of one of the lecterns providing a completely
cordless, wireless portable sound system in a lectern configuration. In
keeping with the "total portability" concept, the first self-contained speaker/
amplifier/wireless system was developed. The advent of wireless microphone
products introduced new prospective markets and set the stage for the future
direction of engineering. The first UNICHANNEL
with ultra-narrow band crystal IF filtering to eliminate interference.

By the early 1980's, wireless microphone products had come to dominate the
growth of the company, leading to further investment in engineering. The
first VHF high band wireless systems were introduced in 1987, taking the

©

proven UNICHANNEL

design to a higher frequency band. The product
line expanded rapidly over the following 5 or 6 years, leading to the
introduction of UHF wireless systems in 1993.

©

receiver was designed

In 1989 the first automatic mixer products were introduced. The most recent
models include an advanced microprocessor controlled mic/line mixer that
provides an adaptive algorithm* that keeps track of microphone activity to
prevent background noise from affecting the mixing action. Future products
in the audio group will include even more advanced microprocessor and
computer controlled components for automation of entire sound systems.

Lectrosonics remains an engineering driven company. Ongoing efforts
continuously produce new designs with the latest technology in electronics
and mechanical engineering.

*US Patent Pending

2

Wireless Diversity Receiver

Table of Contents

FRONT PANEL CONTROLS AND FUNCTIONS ............................ 4

TRANSMITTER AUDIO LEVEL .............................................................................. 4

RF LEVEL INDICATORS ........................................................................................ 4

OPTI-BLEND LEDs ................................................................................................. 4

PILOT LED .............................................................................................................. 4

DIVERSITY MODE ................................................................................................. 4

MONITOR ............................................................................................................... 4

POWER ................................................................................................................... 4

REAR PANEL CONTROLS AND FUNCTIONS ............................... 5

AUDIO OUTPUT ..................................................................................................... 5

PHASE REV ............................................................................................................ 5

AC POWER SUPPLIES .......................................................................................... 5

EXTERNAL POWER JACK .................................................................................... 5

CONTACT CLOSURE ............................................................................................ 5

PILOT TONE BYPASS ........................................................................................... 5

ANTENNA JACKS .................................................................................................. 5

ANTENNA USE AND PLACEMENT ................................................ 6

INSTALLATION AND OPERATING INSTRUCTIONS ..................... 7

TROUBLESHOOTING ..................................................................... 8

POWER SUPPLY AND FUSE ................................................................................ 8

PILOT TONE SQUELCH ........................................................................................ 8

ANTENNAS AND RF SIGNAL STRENGTH ........................................................... 8

AUDIO SIGNAL QUALITY ...................................................................................... 8

UDR200 REPLACEMENT PARTS and ACCESSORIES ................ 9

SERVICE AND REPAIR ................................................................. 10

RETURNING UNITS FOR REPAIR ................................................ 10

SPECIFICATIONS AND FEATURES ............................................. 11

LIMITED ONE YEAR WARRANTY ................................................ 12

Rio Rancho, NM USA

–

3

FRONT PANEL CONTROLS AND FUNCTIONS

TRANSMITTER AUDIO LEVEL

The modulation (audio level) of the incoming signal is indicated
by a fast responding LED strip. The strip is calibrated in 6dB
steps over an expanded scale (54dB) which provides an ex­tremely accurate visual “picture” of the signal dynamics, even at
a distance away from the receiver. Audio signal peaks easily
exceed the response time of VU meters, however, the LED strip
is fast enough to track even brief transients.

RF LEVEL INDICATORS

Two separate LED strips are provided to indicate the level of the
incoming RF signals. The LED strips are calibrated to provide
accurate indications from 1uV to 1mV. The LEDs are highly
visible from a distance, making antenna set up more accurate.
The dual LED strips are especially useful in “trouble-shooting”
difficult antenna installations.

OPTI-BLEND LEDs

The UDR200 receiver operates with a method of audio ratio
blending of two audio outputs. RF level in each receiver is
compared and the audio signals from the two receivers are
mixed together in a ratio that favors the quieter receiver. As this
blending action occurs, the brightness of the two OPTI-BLEND
LEDs will vary. The brighter the LED, the more audio is being
mixed in from that receiver.

FREQUENCY SWITCHES

The UDR200 is frequency agile within the 5 MHz passband of
the front-end filters. To gain access to these switches, slide the
access door up with a fingernail. 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.

PILOT LED

The audio output muting (squelch) function of the UDR200 is
controlled by a 33kHz tone modulation of the RF carrier. The
audio output is muted until this tone is present. As soon as the
tone is received, this LED is turned on to indicate the audio
output is enabled.

The pilot tone function can be defeated by pressing a switch on
the rear panel. The PILOT LED, however, operates the same
regardless of whether or not the defeat switch is pressed. The
PILOT LED strictly indicates the presence of the pilot tone
carrier from the transmitter.

DIVERSITY MODE

This switch is set to the DIVERSITY position for normal opera­tion. For trouble-shooting or when the receiver is used with a
single antenna, the switch can be set to select a single antenna
only.

MONITOR

This is an audio output to drive a wide variety of different types
of headphones. It is also useable as a secondary audio output to
drive recorders or external audio devices.

POWER

Pressing the upper half of the rocker switch applies power to
the receiver. At turn on, there are various relays and delays
built into the receiver to allow various stages to stabilize
before the audio output is activated. This will prevent an
audio “thump” when powering up the receiver and/or the
transmitter.

1uV

LECTROSONICS

5

2uV 1mV

PILOT

25

10

Figure 1 - UDR200 Front Panel

4

100

50

RF LEVEL

250

500

A

B

OPTI

BLEND

-42

-48

FREQUENCY

1.6M

100K

-36

TX AUDIO LEVEL dB

DIVERSITY

A B

MODE

POWER

-18-24-30

LIM0-6-12

MONITOR