Lectrosonics UCR201 User manual

UCR 201
DIVERSITY UHF RECEIVER
LECTROSONICS, INC.
WWW.LECTROSONICS.COM
Rio Rancho, NM
OPERATING INSTRUCTIONS
and trouble-shooting guide
March 20, 2001 @ 2:59 pm
Draft

2
TABLE OF CONTENTS
GENERAL TECHNICAL DESCRIPTION ............................................................... 3
FRONT PANEL CONTROLS AND FUNCTIONS ................................................... 6
Locking and Unlocking the UCR201 MENU ...................................................... 6
MENU SELECTIONS FROM MAIN WINDOW ...................................................... 7
FREQUENCY SCAN MODE .................................................................................. 8
REAR PANEL FEATURES ..................................................................................... 9
ANTENNA USE AND PLACEMENT ................................................................... 10
INSTALLATION AND OPERATING INSTRUCTIONS.......................................... 11
UCR201 REPLACEMENT PARTS and ACCESSORIES.................................... 11
TROUBLESHOOTING .......................................................................................... 12
SPECIFICATIONS AND FEATURES .................................................................. 13
SERVICE AND REPAIR ....................................................................................... 14
RETURNING UNITS FOR REPAIR ..................................................................... 14
WARRANTY ............................................................................................Back cover

3
UHFWireless Diversity Receiver
Rio Rancho, NM – USA
GENERAL TECHNICAL DESCRIPTION
unit frequency range in order to find useable operating
frequencies free of interference.
DIVERSITY RECEPTION
The antenna phase SMART switching diversity technique
was chosen in order to keep the receiver compact enough
for camera mounted or shoulder bag applications. This
diversity reception technique effectively minimizes
dropouts in short range situations where multi-path
reflections can cause serious problems.
RF SECTION
The problem posed to the design staff was to retain the
RF reliability of the Lectrosonics’ fixed frequency designs
but add the flexibility of a frequency agile design. Previ-
ously, the universal (and poor) way to build frequency
agile systems is to design a wide open front end that will
pass any frequency within the tuning range of the system.
This leads to very poor RF performance with lots of
interference, driving the user to switch frequencies in an
attempt to sidestep the interference. Lectrosonics,
however, has developed a robust wideband RF section
with good third order intermodulation performance.
The UCR201 is a portable, high performance, triple-
conversion, frequency synthesized, UHF receiver fully
compatible with all Lectrosonics 200 series transmitters.
The RF performance is extremely stable over a very wide
temperature range, making the UCR201 perfectly suited
to the rough environmental conditions found in the field.
The proprietary audio processing includes a dual-band
compandor for very low distortion and a superior signal to
noise ratio. The Smart Squelch system is operated by a
separate pilot tone and mutes the audio output directly at
the output connector.
The UCR201 features a menu-driven LCD graphic display
and a three button control panel. The combination iconic
and textual interface display windows provide convenient
and efficient access to system functions and status using
the menu button. For example, the main window alone
shows the pilot tone indicator, antenna diversity phase,
RF level, audio level, receiver battery status and transmit-
ter battery status. It is also possible to bypass the pilot
tone from the main display window. Other display win-
dows show operating frequency, audio output level,
battery status in tenths of volts, test tone, and also
provide for selection of levels or functions using the
select buttons. The frequency scan mode provodes a
graphic means to observe all signals “on the air” within the
Attenuation
IF
FILTER
2 (HI)
1 (COMMON
)
3 (LO)
50
50
2K
2K
u P
L C D
D i s p l a y
P a n e l
PILOT TONE
DETECTOR
FILTER
AMP
2nd
VCO
2:1
EXPANDER
TREBLE
2:1
EXPANDER
BASS
23KHZ
LP
FILTER
XLR
OUT
HI-LEVEL
MIXER
RF MODULE
3RD MIXER
AND
IF AMP
50KHz
LP FILTER
XTAL
CONTROLLED
3rd
OSCILLATOR
SAW
FILTER
244 MHz
IF AMP
COUNTING
DETECTOR
AUDIO
AMP
UCR201
BLOCK DIAGRAM
VARIABLE
CUT-OFF
LP FILTER
ANTENNA
SWITCHING
FILTER
E PROM
2
1st
VCO
Smart Diversity Smart Squelch
2ND
MIXER
10.7 MHZ
FILTER
SYNTHESIZER
LC
Filter
Digital
Squelch
Output
Level
Adjust Squelch
Digital
Attenuator

4
The problem of frequency agility is further compounded
when you realize that frequency changes “on the fly”
cannot be made on any type of wireless system. For
example, if there is suddenly an interference problem with
a system in use, on stage for instance, a frequency
change cannot be made without interrupting the program.
Basically, the show must go on. In multichannel applica-
tions, changing the frequency of one system will usually
produce all kinds of new intermodulation problems with
the other systems operating in the same location. Fre-
quency agility is not the universal panacea for interfer-
ence problems. It is only another tool and a limited tool at
that. The first line of defense must be the system’s basic
immunity to interference. That required a new look at
frequency agile receiver design.
DOUBLE BALANCED DIODE MIXERS
In all wireless receivers, a mixer is used to convert the
carrier frequency to the IF frequency where most of the
filtering and gain in the receiver takes place. After doing
all the right things in the front end, it would be a shame to
waste the performance with a second rate mixer. In other
designs that is exactly what happens since mediocre
mixers cause more intermodulation problems than medio-
cre front ends. The only solution was a new technology
GaAs mixer having a robust 3rd order of +25dBm. The
mixer in the UCR201 produces output at only the sum and
difference signals, with minimal spurious signals. This
mixer offers a very high overload threshold and a high
degree of isolation between ports. The IF output of this
mixer is at 244 MHz which is unusually high for a wireless
receiver. This high frequency was chosen to increase the
image rejection in the front end to as high or a higher level
than our fixed frequency designs. The mixer is followed
by low noise amplifiers and SAW filters to preserve the
superior RF performance.
SURFACE ACOUSTIC WAVE FILTER
The UCR201 is unique in that it uses a state of the art
SAW filter in the IF section. The SAW filter is the only
filter that can combine sharp skirts, constant group delay,
and wide bandwidth in one filter. Though expensive, this
special type of filter allows us to follow the basic receiver
rule of doing the primary filtering as early as possible, at
as high a frequency as possible and before high gain is
applied to the signal. Since these filters are made of
quartz, they are very temperature stable. Conventional
LC filters at these frequencies don’t begin to perform as
well and in addition would drift unacceptably in the
elevated temperatures of an equipment rack. After
following the rule in a rigorous way, and due to the sharp
filtering action of the SAW filters, the 244MHz signal is
converted to 10.7Mhz and then to the low frequency of
300 kHz. Lots of gain is then applied in a conventional IC
and the signal is then converted to audio. 300 kHz is
very unconventional for a second IF in a wide deviation
(±50 kHz) system. We chose to use 300 kHz to obtain an
outstanding AM rejection figure over a very wide range of
signal strengths and to produce an excellent noise
improvement at low signal strengths (capture ratio). To
use an IF at 300 kHz requires an unusual circuit to
convert the IF to audio.
DIGITAL PULSE COUNTING DETECTOR
The UCR201 receiver uses an advanced digital pulse
detector to demodulate the FM signal, rather than a
conventional quadrature detector. The common problem
with quadrature detectors is thermal drift, particularly
those that operate at higher frequencies like 10.7 MHz.
Though the quadrature detectors may work well at room
temperature, if they are not carefully compensated, they
will produce amplitude changes and audio distortion in the
elevated temperatures of an equipment rack. Some
manufacturers try to get around the problem by tuning
their systems at higher temperatures after they’ve been
on for some time. The end result is a design that is not
within specifications until it warms up.
The UCR201 design presents an elegantly simple, yet
highly effective solution to this age old problem. The
UCR201 detector basically works like this: A stream of
precision pulses is generated at 300kHz locked to the FM
signal coming from the 300 kHz IF section. The pulse
width is constant, but the timing between pulses varies
with the frequency shift of the FM signal. The integrated
voltage of the pulses within any given time interval varies
in direct proportion to the frequency modulation of the
radio signal. Another way of describing it is that as the
FM modulation increases the frequency, the circuit
produces more pulses and as the modulation decreases
the frequency, the circuit produces fewer pulses. More
pulses produces a higher voltage and fewer pulses a
lower voltage. The resultant varying voltage is the audio
signal.
This type of detector eliminates the traditional problems
with quadrature detectors and provides very low audio
distortion, high temperature stability and stable audio
level. The counting detector also adds additional AM
rejection, in addition to the limiting in the IF section. The
amplitude of the pulses is constant, so level differences
in the IF signal do not affect the pulse.
TRI MODE DYNAMIC FILTER
The audio signal is passed through a “dynamic noise
reduction circuit”. The cutoff frequency of this filter is
varied automatically by measuring the amplitude and
frequency of the audio signal and the quality of the RF
signal. The audio bandwidth is held only to that point
necessary to pass the highest frequency audio signal
present at the time. If the RF level is weak, then the filter
becomes more aggressive. This results in a dramatic
reduction of “hiss”at all times. During passages with a
high frequency content, this filter gets completely “out of
the way”and passes the signal with no decrease in high-

5
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
frequency response. Keep in mind that if hiss is added to
a signal, there is a psychoacoustic effect that makes the
sound seem brighter. The other side of this is that if hiss
is removed from a signal it will sound duller. Basically the
ear’s detection apparatus is pre-sensitized to high fre-
quency sounds by small amounts of high frequency hiss.
Consider this effect when making a judgment about the
sound quality of various wireless systems and this
particular filter. Extensive testing has shown that this
filter is totally transparent.
PILOT TONE MUTE
The UCR201 uses a pilot tone muting technique in order
to protect against the reception of stray signals. The
Lectrosonics transmitter adds an inaudible signal, known
as the pilot tone, to the transmitted signal. The receiver
detects (and removes) the pilot tone, and is thus able to
identify the desired signal and mute all others.
When the receiver is powered up, receive audio is muted
unless a proper pilot tone is detected. The pilot tone must
be present for approximately one second before the signal
is accepted.
The PILOT TONE BYPASS mode is set from a menu
screen. In this mode, the received audio remains unmuted
regardless of the presence or absence of a pilot tone.
This mode is useful for locating a clear frequency, since
any potential interference may be heard. It may also be
used in situations where squelching behavior is undesir-
able. The PILOT TONE BYPASS disables the squelch, as
described below.
SMART SQUELCH
The UCR201 employs a sophisticated squelching system
in an attempt to deliver the cleanest possible audio during
marginal conditions of reception. Any squelching system
faces inevitable trade-offs: squelch too much and valuable
audio information may be lost, squelch too little and
excessive noise may be heard; respond too rapidly and
the audio sounds “choppy”, respond too sluggishly and
syllables or entire words are cut off.
The UCR201 combines several techniques to achieve an
optimal balance, removing distracting noise, without the
squelching action itself becoming a distraction. One of
these techniques involves waiting for a word or syllable to
complete before squelching. Another incorporates recent
squelching history and recent signal strength, adjusting
squelching behavior dynamically for the most serviceable
result under variable conditions. Using these and other
techniques, the UCR201 can deliver acceptable audio
quality from otherwise unusable signals.
In the PILOT TONE BYPASS mode, the squelch system
is disabled. Received audio remains unmuted at all times
with this setting.
OUTPUT LEVEL ADJUST
A front panel menu screen allows adjusting the audio
output in 1dB steps from -50 to +10dBu using the menu
and up and down buttons.
POWER SUPPLY
The UCR201 may be operated from an external DC
source (see Specifications and Features section for
allowed voltages.) The receiver has a built in Poly-Fuse to
protect the unit. This fuse resets if the power supply is
disconnected for about 15 seconds.
LCD DISPLAY SCREEN
The display screen has four main windows. Pressing the
menu button rotates through each of these windows.
If the battery gets low on either transmitter or receiver, a
message will interrupt the display every few seconds. A
dead receiver battery will cause the receiver to mute,
cease function and DEAD BATTERY will be displayed.
After a power off, the unit defaults to the main window
and to the most recent frequency and audio settings.
These settings are retained even if the battery is re-
moved.
The display backlight is always on when plugged into an
external power source and will turn off after five minutes
of no keypress activity when on the internal battery.
POWER UP SEQUENCE
When the UCR201 is powered up, it is operational in
about one second. Audio will pass if there is an active
transmitter on the correct frequency. At power-up, the
LCD panel will automatically scroll through a series of
screens to confirm proper operation and inform you of its
state. First it will show LOCKED or UNLOCKED. (See
Locking and Unlocking the UCR201 Menu) The next
window will say Lectrosonics –(we like our name). The
third window will show the model # (UCR201) and the
firmware revision of the internal programming. The fourth
window will show which frequency block the receiver will
tune. The fifth window will be the main screen (page).
It is important to remember that the UCR201 is fully
operational during the power up sequence –you do not
have to wait for the power up sequence to finish.
POWER OFF
When the power switch is moved to the OFF position the
audio output is instantly muted (squelched).

6
SELECT DOWN Button -
control down one step
SELECT UP Button - control up one step
MENU Button -
changes windows
OFF/ON - Power switch
Main Window Elements
RF levels - reference for
RF level screen icon
Audio Levels - reference levels for audio
signal modulation from transmitter
OFF ON
MENU
ANT 1 ANT 2
SELECT
Pilot
Div RF Aud Rx Tx
BAT
-40 -20 0 dB
1000
100
10
1
uV
Pilot tone indicator - Shows steady P when pilot tone from transmitter is present; will flash if no pilot tone is
detected; will show a small b if bypassed. To bypass the pilot tone, press the UP and MENU buttons simul-
taneously. Press UP and MENU to return to PILOT TONE.
Antenna Phase indicator - Shows antenna phase switching activity - as antenna phase is switched from
one phase to another, the symbol will invert.
RF level - Shows RF levels - levels are engraved on the bezel at the left side of the display from 1 to
1000uV.
Audio Levels - Shows audio level as received from the transmitter - the display will appear as a solid square
block when in limiting. Levels in dB are printed on the bezel at the top of the screen.
Battery Levels - Rx shows receiver battery condition and will flash when approximately one hour of opera-
tional time is remaining. Tx - shows transmitter battery condition - will flash when approximately one hour
operational time is left in battery. The TX battery icon usually appears 5 to 10 seconds after power on. When
using external power the RX battery icon changes to a power plug.
FRONT PANEL CONTROLS AND FUNCTIONS
Locking and Unlocking the UCR201 MENU
To prevent accidental changes in the various Menu windows, you can lock access to the MENU button. The unit is
shipped in the UNLOCKED mode.
To Lock the UCR201 MENU button –Hold the MENU button down until a bar begins tracking horizontally across the
screen. The bar indicates the UCR201 is now locking down all MENU access. Hold until the screen says LOCKED.
If you release before LOCKED is shown, the unit will remain UNLOCKED. When the MENU button is locked, the pilot
bypass toggle is also locked. When in Scan mode, you must return to the main menu before locking.
When the unit is in locked mode, attempts to access the MENU windows will result in a window that says HOLD TO
UNLOCK. You must UNLOCK the unit to change FREQUENCY, LEVEL or engage the SCAN function.
To UNLOCK - Hold the MENU button down until a bar begins tracking horizontally across the screen. The bar indi-
cates the UCR201 is now unlocking all MENU access. Hold until the screen says UNLOCKED. When the unit is
UNLOCKED, normal operation is restored.

7
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
MENU SELECTIONS FROM MAIN WINDOW
FREQUENCYWindow
TV channel - which television broadcast channel this
frequency falls within.
Transmitter switch settings - these are the correct
switch settings for the frequency switches on your
transmitter - see your transmitter instructions.
Frequency - Press the Select Up and Select Down
buttons to change the frequency of the receiver. Be
certain to change the transmitter switches to match the
settings shown in the upper right hand corner.
AUDIO TEST TONE Window
While in the LEVEL screen, you can activate an audio
test tone by pressing both the SELECT UP and SELECT
DOWN simultaneously.
The level of the test tone will remain at the level set by
you in the LEVEL window. Pressing any button returns
you to the LEVEL window and turns off the test tone.
(Note - the test tone is generated by the microprocessor
and has 5% distortion. The test tone is strictly for confir-
mation of output levels.)
From the main metering window, you can navigate to the FREQUENCY, LEVEL and BATTERY windows in sequence
by pressing the MENU button.
LEVEL Window
Display shows the audio output level of the receiver in
dBu. Use the SELECT UP or SELECT DOWN buttons to
change the levels. Range is from -50dBu to +10dBu in
1dB steps.
TV40 AE
631.800
LEVEL
-50 dBu
1KHZ
-50 dBu
TX 7.2V
RX 8.2V
BATTERY LEVEL Window
This window shows the transmitter (TX) and receiver (RX)
battery voltage in tenth volt increments. These levels will
flash when the voltages drop below suggested optimum
working levels. Typically, there will be about one hour
operating time remaining after the indicators begin to
flash. The RX voltage changes to LINE when operating on
external power.
Press
All
Buttons
Frequency
Scan Mode
Menu
Press &
Hold
Menu
Lock/Unlock
Menu
Press
Menu
Press
Menu
Press
Menu
Press
TV40 AE
631.800
TX 7.2V
RX 8.2V
Power Up
Pilot
Off/On
Press
UP Select
& MENU
Battery Level Window Frequency Window
LEVEL
-50 dBu
Press Both
Select Buttons
Press Any
Button
1KHZ
-50 dBu
Test Tone Window
Main Window

8
FREQUENCY SCAN MODE
Switch Settings - shows the
transmitter switch settings
- will change rapidly while
the unit is scanning.
Cursor - shows relative
position of the scanner within
the 25Mhz band of the receiver
RF Level indicators
Coarse Scan Mode Display Elements
To use the integrated scanner function, depress both SELECT buttons (with one finger) and the MENU button at the
same time. The display will switch to the COARSE SCAN WINDOW if power has been off since scan mode was last
used. The display will switch back to the last used window if power has not been off since scan mode was last used.
B8
B8
Switch Settings
Cursor
SCROLL reminders
Scan level indications - showing relative level of RF
activity across the 25MHz bandwidth of the receiver.
To stop auto scanning, press the MENU button once. The
auto scan will stop immediately. The unit is now in the
coarse manual scan mode. Each vertical band of the
display represents 8 frequencies (800kHz). By pressing
the Menu Button once, you can shift to FINE manual
scan mode which will show a smaller portion of the
spectrum of the receiver.
Fine Scan Mode Display Elements
In FINE display mode, each vertical band represents
each frequency the UCR201 is capable of tuning. The
upper right corner shows the frequency switch settings.
There is a center bar which is the cursor. Underneath the
switch settings are two arrows to remind you that this is a
partial picture of the spectrum and that you can scroll left
or right to view the entire spectrum of the receiver.
As you scroll through the frequencies, the cursor remains
in place while the display scrolls left or right. Pressing
the Up button will make the display scroll left, showing
higher frequencies. Pressing the down button will make
the display scroll right, showing progressively lower
frequencies. When you find an empty channel, stop
scrolling and press the three front panel buttons to return
to the main menu. The UCR201 will be retuned to the new
frequency. Reset your transmitter switches to the same
settings as shown on the display and your system will be
ready for operation.
Exiting Scan Mode
(from any scan window)
B8
Press Any
Button
B8 Menu
Press
CC
Press
All
Buttons
USE OLD
USE NEW
Menu
Press
Frequency
Choice
Window
Exit From Any
SCAN Window
Press All Buttons
Up Select-Old
or
Down Select-New
Main or Freq
Window
Any
Window
Coarse Auto Scan Window
Coarse
Manual Scan
Window
Press
All
Buttons
USE OLD
USE NEW
Up Select-Old
or
Down Select-New
Main or Freq
Window
Frequency
Choice
Window
Remaining unscanned
part of band.

9
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
REAR PANEL FEATURES
To open the battery
compartment door, push the
door up and away from the case
with your thumb, then swing
open.
1
2
AUDIO
OUT
10-18VDC
BATTERY DOOR
To open lift
this edge and
turn door
12
3
XLR Audio Output Jack
The audio output is balanced but not floating. Pin 2 is in
phase if the microphone is properly wired in phase on the
transmitter. (This can vary from brand to brand of lavaliere
microphone).
Power Input Jack
The power input jack can accept 10-18 VDC - the center
pin is positive and sleeve is ground. The input is diode
protected to prevent damage if the power is applied with
reversed polarity but the unit will not work. Strain relief to
avoid accidental disconnection can be provided with the
included small hook and loop strip. Attach the adhesive
strip side to the side of the receiver or mount with the
opening end of the strip up - place the cable in the strip
and secure.
To Replace the Battery
Open the bottom battery door cover with your thumb,
rotate the door until it is perpendicular with the case and
allow the battery to fall out of the compartment into your
hand. Retaining pins will prevent you from opening too
far. It is difficult to install the battery backwards. Ob-
serve the large and small holes in the battery contact pad
before inserting a new battery. Insert the contact end of
the battery first, making sure the contacts are aligned
with the holes in the contact pad, and then swing the door
closed. You will feel it snap into place when it is fully
closed.

10
ANTENNA USE AND PLACEMENT
leaves the room, or when the transmitter or receiver is
operated in a different location.
The UCR201 receiver offers a sophisticated diversity
design which overcomes drop-out problems in almost any
situation. In the event, however, that you do encounter a
dropout problem, first try moving the receiver at least 3 or
4 feet from where it was. This may alleviate the drop-out
problem at that location. If drop-outs are still a problem,
try moving the unit to an entirely different location in the
room or moving the receiver in closer to the transmitter
location.
Lectrosonics transmitters radiate power very efficiently,
and the receivers are very sensitive. This reduces drop-
outs to an insignificant level. If, however, you do encoun-
ter drop-outs frequently, call the factory or consult your
dealer. There is probably a simple solution.
DIRECT SIGNAL
INDIRECT SIGNAL
DIRECT SIGNAL
INDIRECT SIGNAL
MULTI-PATH DROPOUT
TRANSMITTER
RECEIVER
PHASE
CANCELLATION
REFLECTIVE SURFACE
The receiver is supplied with two fixed antennas. It is
good to position the receiver so that there is a direct “line
of sight”between the transmitter and the receiver antenna.
In situations where the operating range is less than about
100 feet, the antenna positioning is much less critical.
A wireless transmitter sends a radio signal out in all
directions. This signal will often bounce off nearby walls,
ceilings, etc. and a strong reflection can arrive at the
receiver antenna along with the direct signal. If the direct
and reflected signals are out of phase with each other a
cancellation may occur. The result would be a “drop-out.”
A drop-out sounds like either audible noise (hiss), or in
severe cases, may result in a complete loss of the carrier
and the sound when the transmitter is positioned in
certain locations in the room. A UHF drop-out normally
sounds like a short “hiss”or a “swishing”sound. Moving
the transmitter even a few inches will change the sound
of the hum or hiss, or eliminate it. A drop-out situation
may be either better or worse as the crowd fills and/or

11
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
INSTALLATION AND OPERATING INSTRUCTIONS
1. Install battery or connect the power cord. The battery should be inserted contact end down into the battery com-
partment.
2. Set the frequency to match the transmitter frequency switch setting. See page 7.
3. Connect the audio cable to the audio output XLR.
4. Set the Power switch to ON (right position). Check to see that the LCD display panel activates.
5. Set the audio LEVEL to minimum. To get to the LEVEL menu press the Menu button until the screen labeled Level
appears. Levels can be adjusted up and down in 1dB increments from -50 to +10dBu. This level is achieved when
the transmitter is at a full 70kHz deviation.
6. Adjust the transmitter gain. THIS IS PERHAPS THE MOST IMPORTANT STEP IN THE SET UP PROCEDURE.
See your transmitter manual (Operating Instructions section) for details on how to adjust the transmitter gain. In
general, adjust the transmitter gain so that the voice peaks will cause the first Mod Level display on the front of
the receiver to show a full block on the loudest peak audio levels. Normal levels should cause the audio level icon
to fluctuate fully. This will result in the best possible signal to noise ratio for the system without causing overload
distortion.
7. Adjust the Audio Output according to the type of input on your equipment. Use the LEVEL menu and adjust the
levels with the Up and Down buttons.
The input levels of different cameras, VCRs, and PA equipment vary, which may require that you set the Audio
Output control to 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. The UCR201 audio output is designed to drive any
audio input device from microphone level to +10dBu line level.
UCR201 Simplified Audio Output Circuit
UCR201 REPLACEMENT PARTS and ACCESSORIES
Part No. Description
32251 Velcro mounting strips
35753 Zippered, padded vinyl system pouch
CH12 AC power supply
50
50
2K
2K
XLR
OUT
AUDIO
AMP
Output
Level
Adjust Squelch
2 (HI)
1 (COMMON)
3 (LO)

12
POWER SUPPLY AND FUSE
LCD Screen not active or lit.
•External power supply disconnected or
inadequate.
•Main power supply fuse tripped. Turn the
receiver off, remove the cause of the overload
and turn the receiver back on.
•Wrong polarity power source. The external DC
in requires POSITIVE to be on the center pin.
Battery may be low - check battery level - (press
MENU button 3 times )
PILOT TONE SQUELCH
The PILOT indicator on the front panel shows as a solid
“P”to indicate that the audio has been turned on at the
transmitter, and that the audio output on the receiver is
enabled. When the “P”is on, the audio is enabled. If the
“P”is flashing the pilot tone is not detected and the audio
will be muted (squelched).
When the pilot tone is disabled, the “P”changes to a “b”.
PILOT indicator is on “P”, but no sound
•Audio output cable bad or disconnected.
•Audio Output level set too low.
PILOT “P”keeps flashing when transmitter audio
switch is turned on
•It takes several seconds for the relay to actuate
the PILOT.Turn the transmitter power and audio
switches on and wait 3 to 5 seconds for the P to
come on.
•Transmitter and receiver not on same frequency.
Noise on audio and Pilot lamp is red.
•The pilot tone bypass has been pressed. Press
the SELECT UP and the MENU buttons to reset.
ANTENNAS AND RF SIGNAL STRENGTH
RF Level is weak.
Receiver may need to be moved or reoriented
Antenna on transmitter may be defective or
poorly connected - double check antenna on
transmitter.
•Improper length of antenna, or wrong antenna on
transmitter. UHF whip antennas are generally
about 3 to 5 inches long. UHF helical antennas
may be shorter, but are often less efficient.
No RF Signal
• Make certain frequency switches on transmitter
match the receiver frequency setting.
• Check battery in transmitter
TROUBLESHOOTING
AUDIO SIGNAL QUALITY
Poor signal to noise ratio
•Transmitter gain set too low
•Noise may not be in wireless system. Mute the
audio signal at the transmitter and see if noise
remains. If the noise remains, then turn the
power off at the transmitter and see if it remains.
If the noise is still present, then the problem is
not in the transmitter.
•If noise is still present when the transmitter is
turned off, try lowering the audio output level on
the UCR201 and see if the noise lowers
correspondingly. If the noise remains, the
problem is not in the receiver.
•Receiver output is too low for the input of the
device it is feeding. Try increasing the output
level of the UCR201 and lowering the input gain
on the device the UCR201 is feeding.
Distortion
•Transmitter input gain too high. Check and/or
readjust input gain on transmitter according to the
LEDs on the transmitter and then verify the
setting with the transmitter Mod level LED pair on
the UCR201D front panel.
•Audio output level too high for the device the
UCR201 is feeding. Lower the output level of the
UCR201.

13
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
SPECIFICATIONS AND FEATURES
Operating Frequencies (MHz):
Block 21 537.600 - 563.100
Block 22 563.200 - 588.700
Block 23 588.800 - 614.300
Block 24 614.400 - 639.900
Block 25 640.000 - 665.500
Block 26 665.600 - 691.100
Block 27 691.200 - 716.700
Frequency Adjustment Range: 25.5 MHz in 100kHz steps
Receiver Type: Triple conversion, superheterodyne, 244MHz , 10.7MHz and 300kHz
Frequency Stability: ±0.001 %
Front end bandwidth: +/- 30MHz @ -3dB
Sensitivity
20 dB Sinad: 0.9 uV (-108 dBm), A weighted
60 dB Quieting: 1.12 uV (-106 dBm), A weighted
Squelch quieting: Greater than 125 dB*
AM rejection: Greater than 60 dB, 2 uV to 1 Volt (Undetectable after processing)
Modulation acceptance: >90 kHz
Image and spurious rejection: >85dB
Third order intercept: 0 dBm
Diversity method: Phased antenna diversity
FM Detector: Digital Pulse Counting Detector operating at 300kHz
Antenna inputs: Dual fixed - made of marine phosphor bronze
Audio outputs
Rear Panel XLR: Calibrated into an actual output impedance, approx 500 Ohms.
Typical 10K Ohm balanced load, adjustable
from -50dBu to +10dBu in 1dB steps
Front Panel Controls and Indicators: LCD control panel - menus include:
Main control panel Pilot tone; antenna phase, receiver battery level;
transmitter battery level; audio level, RF level
Frequency screen Frequency, TV channel; Transmitter switch setting
Level Audio output level from -50Bu to +10dBu
Battery levels Both transmitter and receiver in 1/10th volt steps.
Scanning mode Coarse and fine screens for spectrum check
Test tone 1kHz, -50dBm to +10dBm output, < 5% THD
Rear Panel Controls and features: XLR audio output jack; External DC input; Battery compartment access
Power Options:
Ext DC: Minimum 10 Volts to maximum 18 Volts DC; 1.6 W, 100 mA at 12VDC
zInt Batt: 9V alkaline or lithium (90 mA @ 9V, 120mA @ 6V)
Battery Life:
9V alkaline 3.5 hours continuous, 4 hours intermittent
9V lithium Up to 12 hours (continuous and intermittent usage are the same)
Weight: 10.7oz.
Dimensions: 2.83" wide x 1.25" high x 4.64" deep
Specifications subject to change without notice.
Block 28 716.800 - 742.300
Block 29 742.400 - 767.900
Block 30 768.000 - 793.500 (outside USA)
Block 31 793.600 - 819.100 (outside USA)
Block 32 819.200 - 844.700 (outside USA)
Block 33 844.800 - 865.000 (outside USA)

14
SERVICE AND REPAIR
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Check out the intercon-
necting cords and then go through the TROUBLE SHOOTING section in the manual
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop
attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connec-
tion, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set
at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment.
There are no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS’service department is equipped and staffed to quickly repair your equipment. In warranty repairs are
made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest flat
rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does to
make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for
out of warranty repairs.
RETURNING UNITS FOR REPAIR
You will save yourself time and trouble if you will follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to know
the nature of the problem, the model number and the serial number of the equipment. We also need a phone number
where you can be reached 8 am to 4 pm (Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed
your repair through our receiving and repair departments. The return authorization number must be clearly shown on
the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed”for
safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or damage
to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Mailing address: Shipping address: Telephones:
Lectrosonics, Inc. Lectrosonics, Inc. Regular: [phone]
PO Box 15900 581 Laser Rd. Toll Free [phone]
Rio Rancho, NM 87174 Rio Rancho, NM 87124 FAX: [phone]
USA USA
Web : http://www.lectrosonics.com Email: [e-mail]

15
UHFWireless Diversity Receiver
Rio Rancho, NM –USA
Have you found the undocumented feature yet?

LECTROSONICS, INC.
581 LASER ROAD
RIO RANCHO, NM 87124 USA
March 20, 2001
LIMITED ONE YEAR WARRANTY
LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc., shipping costs
prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights
which vary from state to state.