UCR401
Compact Wireless Receiver
INSTRUCTION MANUAL
Featuring
Digital Hybrid Wireless® Technology
U.S. Patent 7,225,135
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Rio Rancho, NM, USA
www.lectrosonics.com
UCR401
2
LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
Digital Hybrid Wireless
TM
The Lectrosonics Digital Hybrid WirelessTM uses innovative technology to combine the new advantages of
digital audio with the advantages of analog RF transmission, thus delivering the superior sound quality of a
digital system and the excellent range of an analog system. A proprietary algorithm encodes the digital audio
information into an analog format which can be transmitted in a robust manner over an analog FM wireless
link. The receiver employs state-of-the-art filters, RF
amplifiers, mixers and detector to capture the encoded
signal and a DSP recovers the original digital audio.
This digital/analog hybrid technique has some very
beneficial properties. Because the information beingtransmitted is digitally encoded, immunity to noise is
much higher than a compandor can offer. Because the
encoded audio is sent in analog format, spectral and
power efficiency and operating range are not compromised.
Under weak RF conditions, the received signal degrades gracefully, like an analog system, delivering
as much usable audio as possible at maximum range.
Since the audio is free of compandor artifacts, pumping
and breathing problems are also greatly reduced.
Rio Rancho, NM
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UCR401
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LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
Table of Contents
General Technical Description ..............................................................................................................................................................7
Front Panel Controls and Functions ...................................................................................................................................................10
LCD Screen ........................................................................................................................................................................................10
MENU Button ......................................................................................................................................................................................10
SELECT Up/Down Buttons .................................................................................................................................................................10
Power ON/OFF Switch ........................................................................................................................................................................ 10
Rear Panel Features .............................................................................................................................................................................10
XLR Audio Output Jack .......................................................................................................................................................................10
Power Input Jack .................................................................................................................................................................................10
Main Window (LCD) .............................................................................................................................................................................. 11
Menu Selections from Main Window ...................................................................................................................................................12
Frequency Window..............................................................................................................................................................................12
Battery Level Window .........................................................................................................................................................................12
Setup Window .....................................................................................................................................................................................13
LEVEL .................................................................................................................................................................................................13
TONE ..................................................................................................................................................................................................13
TXBAT .................................................................................................................................................................................................13
PHASE ................................................................................................................................................................................................13
SmtNR ................................................................................................................................................................................................13
TUNING ..............................................................................................................................................................................................14
COMPAT .............................................................................................................................................................................................14
Frequency Scan Mode .........................................................................................................................................................................15
Scan & View Window Elements ..........................................................................................................................................................15
Fine View Window Elements ............................................................................................................................................................... 15
Antenna Orientation .............................................................................................................................................................................16
Setup and Operating Instructions .......................................................................................................................................................17
Installing/Replacing Batteries..............................................................................................................................................................17
Adjusting Audio Output .......................................................................................................................................................................17
Finding Clear Frequencies ..................................................................................................................................................................18
Locking and Unlocking the UCR401 ...................................................................................................................................................19
Pre-coordinated Frequencies ..............................................................................................................................................................20
Frequency Coordination ......................................................................................................................................................................21
Multi-channel System Checkout .........................................................................................................................................................21
Pilot Tone Bypass .................................................................................................................................................................................22
Replacement Parts and Accessories ..................................................................................................................................................23
Mating power plug dimensions ...........................................................................................................................................................23
Troubleshooting ....................................................................................................................................................................................24
Specifications and Features ................................................................................................................................................................26
Service and Repair ...............................................................................................................................................................................27
Returning Units for Repair ..................................................................................................................................................................27
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UCR401
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LECTROSONICS, INC.
General Technical Description
UHF Digital Hybrid Wireless® Receiver
RF MODULE
ANTENNA
COMBINING
LCD
Display
Panel
Smart Diversity
FILTER
PLL
SYNTHESIZER
AMP
FILTER
uP
2
E PROM
LC
Filter
1st
VCO
SAW
FILTER
244 MHz
IF AMP
2nd
VCO
FILTER
The UCR401 is a portable, high performance, tripleconversion, frequency synthesized, UHF receiver fully
compatible with all Lectrosonics 400 Series transmitters, Lectrosonics wideband UHF analog systems. DSP
compatibility modes also provide compatibility with
some other transmitter brands. The RF performance is
extremely stable over a very wide temperature range,
making the UCR401 perfectly suited to the rough
environmental conditions found in field production. The
combination of digital audio with analog RF produces
superb audio quality and extended operating range.
The UCR401 front panel features a menu-driven LCD
interface and three control buttons to conveniently view
and alter user settings. The main LCD window simultaneously displays the pilot tone indicator, phase diversity
activity, RF level, audio level, battery status for both
transmitter and receiver. It is also possible to bypass
the pilot tone squelch from the main display window for
diagnostic purposes. Other windows display operating
frequency, audio output level, battery voltage and test
tone status.
A built-in spectrum analyzer scans across the tuning
range of the receiver to locate RF signals in the vicinity
and find clear operating frequencies.
Diversity Reception
Microprocessor controlled antenna phase combining
keeps the receiver small, with low power consumption,
yet it is still able to deal effectively with multi-path dropouts. SmartDiversity™ analyzes both the incoming RF
level and the rate of change in RF level to determine the
optimum timing for phase switching, and the optimum
antenna phase. This adaptive technique operates over
a wide range of RF levels to anticipate dropouts before
they occur. The system also employs “opportunistic
switching” to analyze and then latch the phase in the
best position during brief squelch activity.
HI-LEVEL
MIXER
SAW
FILTER
244 MHz
IF AMP
PILOT TONE
DETECT
Attenuation
CERAMIC
FILTER
2ND
MIXER
10.7 MHZ
XTAL
CONTROLLED
3rd
OSCILLATOR
3RD MIXER
AND
IF AMP
COUNTING
DETECTOR
50KHz
LP FILTER
A-D
CONVERTER
DIGITAL SIGNAL
PROCESSOR
D-A
CONVERTER
UCR401
BLOCK DIAGRAM
Output
Level
Adjust
AUDIO
AMP
Digital
Attenuator
XLR
OUT
50
5K
1 (COMMON)
5K
50
2 (HI)
3 (LO)
RF Front-End and Mixer
The UCR401 is frequency agile and can be set to
operate on any one of 256 frequencies within its tuning
range. To significantly reduce unwanted interference
and intermodulation problems, the UCR401’s front-end
is tuned to the desired frequency band and rejects or
“tunes out” unwanted out-of-band signals. Two tuned
HI-Q ceramic transmission line resonators prior to a low
noise, high current RF amplifier provide good selectivity. A LC bandpass filter after the RF amplifier provides
added insurance against strong RF interference, and
the first mixer has a very high third order intercept point.
The overall design ensures stability, selectivity and precise gain in order to handle strong RF signals without
input overload.
Microcontroller, PLL and VCO Circuits
The 8-bit microprocessor is truly the “heart” of the
UCR401 receiver. It monitors user command inputs
from the front panel control buttons and numerous other
internal signals such as RF level, audio levels, pilot tone
levels and external/internal power voltages. Outputs
from the microcontroller drive the LCD display and
backlight, control the squelch and audio output attenuator, and operate the front-end tuning, the PLL/VCO
circuits and the antenna phase switch. The UCR401
design and the advanced technology of the microprocessor control arguably set a new standard in wireless
microphone development.
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UCR401
IF Amplifiers and SAW Filters
The first IF stage at 244 MHz employs two state-of-theart SAW (surface acoustic wave) filters. The use of two
filters significantly increases the depth of filtering while
preserving sharp skirts, constant group delay, and wide
bandwidth. Though expensive, this special type of filter
allows primary filtering as early as possible, at as high a
frequency as possible before high gain is applied to the
signal for maximum image rejection.
Since these filters are made of quartz, they are very
temperature stable. After the SAW filter, the 244 MHz IF
signal is converted to 10.7 MHz IF and then to the low
frequency of 300 kHz. Only then is the majority of the
gain applied, just before the signal is converted to audio
with a pulse counting detector. Although 300 kHz is very
unconventional for an IF in a wide deviation (±75 kHz)
system, it offers outstanding AM rejection figure over
a very wide range of signal strengths and produces an
excellent noise improvement at low signal strengths.
Digital Pulse Counting Detector
The UCR401 receiver uses an elegantly simple, yet
highly effective digital pulse detector to demodulate
the FM signal, rather than a conventional quadrature
detector. This unusual design eliminates thermal drift,
improves AM rejection, and provides very low audio
distortion.
DSP-Based Pilot Tone
The Digital Hybrid system design uses a DSP generated ultrasonic pilot tone to control the receiver audio
muting (squelch). Brief delays are applied to eliminate
thumps, pops or other transients that can occur when
the power is turned on or off. The pilot tone frequency
is different for each of the 256 frequencies in the tuning
range of a system (frequency block). This eliminates
squelch problems in multichannel systems where a
pilot tone signal can appear in the wrong receiver via
intermodulation products. The DSP generated pilot tone
also eliminates fragile crystals, allowing the receiver to
survive shocks and mishandling much better than older
analog-based pilot tone systems.
Note: This description applies only in 400 Series
mode. In 200 Series mode, only one pilot tone
frequency is used on all channels, emulating
the original crystal-based system. In other
compatibility modes, no pilot tone is used.
Smart Squelch
Any squelching system faces inevitable trade-offs:
squelch too aggressively and valuable audio information
may be lost. Squelch too little and excessive noise may
be heard. Respond too rapidly and the audio will sound
“choppy.” Respond too sluggishly and syllables or entire
words can be cut off.
The UCR401 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 technique
™
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 UCR401 can
deliver acceptable audio quality from otherwise unusable signals.
Smart Noise Reduction (SmartNR™)
Note: The SmartNR setting is user selectable
only in 400 Series mode. In other modes, noise
reduction is applied in such a way as to emulate
the original analog system as accurately as
possible and is not user adjustable.
The UCR401 has been meticulously designed using the
best available low noise components and techniques.
Nonetheless, the wide dynamic range of digital hybrid
technology, combined with flat response to 20 kHz,
makes it possible to hear the -120 dBV noise floor in
the mic preamp, or the (usually) greater noise from the
microphone itself. To put this in perspective, the noise
generated by the recommended 4 k bias resistor of
many electret lavaliere mics is –119 dBV and the noise
level of the microphone’s electronics is much higher. In
order to reduce this noise the UCR401 is equipped with
a Smart Noise Reduction algorithm, which removes
hiss without sacrificing high frequency response.
The Smart Noise Reduction algorithm works by attenuating only those portions of the audio signal that fit
a statistical profile for randomness or “electronic hiss.”
Because it isn’t simply a sophisticated variable low pass
filter as in Lectrosonics’s 195 and 200 series analog designs, much greater transparency is obtained. Desired
high frequency signals having some coherence are not
affected, such as speech sibilance and tones.
The Smart Noise Reduction algorithm has three modes,
selectable from a user setup screen: OFF, NORMAL,
and FULL. When switched OFF, no noise reduction is
performed and complete transparency is preserved. All
signals presented to the transmitter’s analog front end,
including any faint microphone hiss, will be faithfully
reproduced at the receiver. When switched to NORMAL,
enough noise reduction is applied to remove most of
the hiss from the mic preamp and some of the hiss from
lavaliere microphones. The noise reduction benefit is
significant in this position, yet the degree of transparency maintained is exceptional. When switched to FULL,
enough noise reduction is applied to remove most of
the hiss from nearly any signal source of reasonable
quality, assuming levels are set properly at the transmitter, and some high frequency environmental noise. The
optimal setting for each application is subjective and
selected while simply listening.
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LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
Supersonic Noise-Based
Dynamic Filter and Squelch
In addition to SmartNR, all hybrid receivers are
equipped with a supersonic noise-based dynamic filter
and squelch system. The incoming audio is monitored
for energy above 22 kHz, pilot tone excepted. Excessive
high frequency energy indicates that the received signal
is too weak to achieve an acceptable signal-to-noise
ratio. Under marginal conditions, a variable low pass
filter is rolled in dynamically, masking the noise while
preserving as much of the transmitted signal as possible. When the channel is too noisy even for the filter,
the audio is squelched.
This noise-based filter and squelch system replaces a
more or less equivalent system used for many years,
which based its operation on RF signal strength. Performance of the two systems is virtually identical, but the
noise-based system requires no calibration and there
is no better way to track the signal-to-noise ratio than to
measure it directly.
RF-Controlled Digital Noise Filter
In extremely weak signal conditions, an RF sensitive
variable frequency filter is applied to reduce the high
frequency response of the receiver. This filter does
nothing until the RF signal strength drops below 3 uV at
which point it begins to roll off high frequencies. Usable
audio remains unaffected, but noise-ups or “hits” occurring near the fringe of reception sound much less harsh.
Audio Output Level
A setup screen is provided for adjusting the audio output level in 1 dB increments from -50 to +5 dBu using
the front panel SEL Up and Down buttons.
Test Tone
To assist in matching the audio levels of equipment connected to the UCR401, a 1 kHz audio test tone, adjustable from -50 to +5 dBu in 1 dB increments, is available
at the XLR connector. This tone is available through the
TONE display window.
Batteries
The UCR401 operates on two AA 1.5 Volt alkaline,
lithium or NiMH batteries. Access to the battery compartment is gained by lifting one end and turning the
rear panel door.
Note: Do not mix battery types in the same unit.
Also, standard or “heavy duty” batteries are not
recommended.
Power Supply
The UCR401 may be operated from an external DC
power source. The power supplies are protected from
damage to the receiver that could occur if a positive
ground power source is applied.
LCD Display
The display has four primary windows. Pressing the
Front Panel MENU button steps through each of these
windows.
If the battery gets low on either transmitter or receiver,
a message will interrupt the display every few seconds
and flash a low battery warning.
After power is turned off and back on again, the unit
defaults to the main window and to the most recent frequency, audio level, transmitter battery type and other
user settings. These settings are retained even if the
batteries are removed. After five minutes of no key activity, the LCD backlight goes off and the display reverts
back to the main window.
Power Up Sequence
The power up sequence consists of four messages that
appear automatically after the power is switched on.
1) UCR401
BLK xx (xx is the frequency block number)
2) VERSION
R.R/A.A (R.R is the RF board firmware version,
A.A is the audio board firmware version)
3) COMPAT
mode (mode is one of the following:
400 - Native 400 Series mode
100 - Lectro 100 Series compatibility
200 - Lectro 200 Series compatibility
MODE 3 - compatible with certain
non-Lectrosonics transmitters)
IFB - compatible with all Lectrosonics IFB
transmitters.
MODE 6 - compatible with certain
non-Lectrosonics transmitters)
4) TUNING
mode (mode is one of the following:
NORMAL - tune in single channel increments
GRP x - tune in precoordinated intermod-free
frequencies (x is A, B, C, D, U or V))
The Main Window appears after the introductory messages are displayed.
The UCR401 is fully operational during the power
up sequence and will immediately respond to button
pushes made before the automatic sequence is completed. If a valid transmitter signal is already present
when the receiver is turned on, the audio output will
typically be engaged somewhere in the middle of the
power-up sequence, following a brief delay to allow the
audio circuits to stabilize.
Power Off
When the Front Panel Power ON/OFF switch is moved
to the OFF position, the audio output is instantly muted
(squelched) and the message “POWERING OFF...” is
displayed briefly before the receiver switches off.
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UCR401
Front Panel Controls and Functions
LCD
SEL Up Button
SEL Down Button
LCD Screen
The LCD Screen is a graphics-type Liquid Crystal
Display that is used to monitor system operation and
configure the UCR401.
MENU Button
The MENU button steps through the four primary windows and setup screens.
Rear Panel Features
AUDIO OUT Jack
MENU Button
Power OFF/ON Switch
SELECT Up/Down Buttons
The SELECT Up/Down buttons are used to select various options within each display selection and for setting
the operating frequency of the receiver.
Power ON/OFF Switch
The Power ON/OFF switch is used to apply battery or
external power to the unit.
Power Input Jack
XLR Audio Output Jack
This is a standard XLR configuration with pin 2 “positive” with reference to handheld and plug-on transmitters. With lavaliere microphones and belt-pack transmitters, however, phase will vary with different types of
microphones (2-wire versus 3-wire for example). The
audio output is balanced but not floating, so an unbalanced signal is available using pin 1 as ground and pin
2 as signal, leaving pin 3 open.
Power Input Jack
The power input jack can accept 6-18 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 until the
reversed polarity condition is fixed. The jack and plug
feature twist-lock retention. The Power Input Jack will
also accommodate non-locking plugs.
10
Note: The external power source must have its
own short-circuit protection
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.
Velcro Strain Relief
LECTROSONICS, INC.
Main Window (LCD)
UHF Digital Hybrid Wireless® Receiver
SEL Up Button - control up
SEL Down Button -
control down one step
The Main Window displays information concerning the
condition of the Pilot Tone, antenna phase, RF and
audio signal levels and battery conditions for both the
receiver and the associated transmitter. It is also the
Icon
one step
RF levels - reference for RF level screen icon
Description
Pilot Tone Indicator
A steady “P” icon will be displayed when a pilot tone from the transmitter is present. The “P” will appear only in those compatibility modes which use pilot tone: 200 Series and the native 400 Series
modes, plus Mode 6. The icon will flash if no pilot tone is detected and will change to a small “b” if the
pilot tone has been bypassed. To bypass the pilot tone, hold MENU and press the UP button. Hold
MENU and press UP again to restore normal pilot tone squelch. Bypassing the pilot tone also disables the squelch, so the “pilot tone bypass” function has an effect even in those compatibility modes
that do not use pilot tone.
Audio Levels - reference levels
for audio signal modulation from
transmitter
MENU Button - changes
windows
Power ON/OFF switch
access portal to menu selections for setting up the receiver and searching for clear frequency channels. (See
Menu Selections from Main Window and Frequency
Scan Mode.)
Antenna Phase Indicator
This icon shows antenna phase switching activity. As the antenna phase is switched, the symbol will
flip vertically.
RF Level
This icon changes in size vertically to indicate the strength of the incoming RF signal. RF levels are
engraved on a scale from 1uV to 1000uV on the bezel to the left of the LCD display.
Audio Levels
This icon changes in size horizontally to indicate the audio level (modulation) of the signal received
from the transmitter. The icon display will change to a solid rectangular block when the audio signal is
being limited in the transmitter. Levels in dB are engraved into the bezel above the LCD display.
Battery Levels
The icon above the Rx symbol indicates the receiver battery condition and will flash when approximately one hour of operating time is remaining. When external power is being used, the Rx battery
icon changes to look like a power plug. The area above the Tx symbol features either a transmitter
battery status icon or the transmitter battery timer, depending on the TXBAT setting. The transmitter
battery status icon is available only in compatibility modes supporting battery telemetry (400 and 200
Series). In such cases, the transmitter battery status icon appears 5 to 10 seconds after the transmitter signal is acquired. If selected in the TXBAT setup screen, the transmitter battery timer is available
in any compatibility mode. It accumulates hours and minutes that the communications link is active,
retaining the timing even when the receiver is off.
Note: To reset the battery timer, press and hold MENU and SELECT Down together for one second.
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UCR401
Frequency
Scan Mode
SELECT
Lock/Unlock
Pilot Off/On
Battery Level
Window
Frequency
Window
Main Window
P
r
e
s
s
M
E
N
U
P
r
e
s
s
M
E
N
U
P
r
e
s
s
M
E
N
U
P
r
e
s
s
M
E
N
U
Hold MENU & press UP
Press All Buttons
Press & Hold MENU
Press UP
Press
UP
Press UP
Press MENU
Setup Window
(Press UP / DOWN to adjust)
Level
Audio Te st To ne
Press MENU
(Press UP / DOWN to adjust)
Press MENU
Press MENU
Audio Test Tone
(Press UP / DOWN to select)
Tx Battery Ty pe
Press MENU
(Press UP / DOWN to select)
Output Phase
Press
UP
Press MENU
(Press UP / DOWN to select)
Press MENU
P
r
e
s
s
U
P
Noise Reduction
Press
UP
Press MENU
(Press UP / DOWN to select)
Press MENU
Tu ning Mode
Press
UP
Press MENU
(Press UP / DOWN to select)
Press MENU
Compatibility Mode
Press
UP
Press MENU
Press
MENU
Press
MENU
Press
UP
Menu Selections from Main Window
From the Main Window, you can navigate
to the Frequency, Battery Level and
Setup windows in a circular sequence by
pressing the MENU button.
Frequency Window
TVxx - The television broadcast channel the frequency
falls within.
Transmitter switch settings (AE
in the illustration) - These are the
correct settings for the frequency
switches on your transmitter - see
your transmitter instructions.
Frequency - Press the SEL Up and
Down buttons to change the frequency of the receiver.
Note: Be certain to change the transmitter
frequency switches to match the settings shown
in the upper right hand corner of the Frequency
window.
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When the TUNING mode is set to NORMAL, the SEL
Up and Down buttons tune in single channel increments. In the GROUP tuning modes, the SEL Up and
Down buttons move among the selected intermod-free
frequencies.
Battery Level Window
This window shows the transmitter (TX) and receiver (RX)
battery voltage. 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 EX when operating on external
power and displays the external power source voltage.
(Disclaimer: We cannot guarantee 0.1 Volt accuracy.)
LECTROSONICS, INC.
Setup Window
In the Setup window, the SEL Up
and Down buttons scroll through a
list of eight possible setup screens:
EXIT, LEVEL, TONE, TXBAT,
PHASE, SmtNR (in 400 Series
mode only), TUNING and COMPAT. Each of these
destinations allows a variety of settings to customize
the receiver operating parameters. Pressing the MENU
button accesses whatever setup screen is identified in
the Setup window. Pressing the MENU button whenever
EXIT is displayed returns the user to the Main Window.
LEVEL
The LEVEL setup screen displays
the audio output level of the receiver in dBu. Use the SEL Up or Down
buttons to change the level. Range
is from -50 to +5 dBu in 1 dB steps.
Press the MENU button to leave this screen.
TONE
The TONE setup screen enables
an audio test tone at the receiver
output for precise level matching
with other equipment. The first
screen prompts you to press the
SEL Up button to enable the tone
at the receiver output jack. The next
screen that appears allows the level
to be adjusted in 1dB steps using
the SEL Up and Down buttons.
When the audio test tone is enabled, the received audio
is muted and an internally generated 1 kHz test tone
is routed to the XLR connector. Since there is only one
audio output level setting for both received audio and
tone, the level set here will be retained in the receive
mode (it will supersede the setting made in the LEVEL
setup screen). The test tone has 1% distortion and is
intended for confirmation of output levels only. To exit
the test tone screen and stop the tone press the MENU
button.
TXBAT
The TXBAT setup screen allows
you to select the exact battery
being used in the transmitter to
provide more accurate battery level
monitoring. Four different types of
batteries are commonly used in Lectrosonics transmitters: 9 Volt alkaline, 9 Volt lithium, AA alkaline, and AA
lithium. Correctly set, this will ensure that adequate
warning will be provided in advance of battery failure.
Use the SEL Up and Down buttons to select the transmitter battery. Press MENU to leave this screen.
In native 400 Series mode as well as in the 200 Series
compatibility mode, the TXBAT menu offers six choices:
9V ALK - Transmitter uses a 9V alkaline battery. Monitor
voltage with battery icon in main window.
UHF Digital Hybrid Wireless® Receiver
9V LTH - Transmitter uses a 9V lithium battery. Monitor
voltage with battery icon in main window.
9V TIM - Transmitter uses a 9V battery. Display its voltage normally in the battery level window but monitor its
status with the battery timer in the main window.
AA ALK - Transmitter uses a AA alkaline battery. Monitor voltage with battery icon in main window.
AA LTH - Transmitter uses a AA lithium battery. Monitor
voltage with battery icon in main window.
AA TIM - Transmitter uses an AA battery. Display its
voltage normally in the battery level window but monitor
its status with the battery timer in the main window.
The 9V TIM and AA TIM settings are most useful for
NiMH batteries as they do not exhibit reliably identifiable voltage drops as they discharge.
In compatibility modes other than 400 Series and 200
Series, no battery telemetry information is available so
the TXBAT setup screen offers only two choices:
NOTIMER - Display no transmitter battery status in the
main window.
TIMER - Monitor the transmitter battery status with the
battery timer in the main window.
Note: To reset the battery timer, press and hold
MENU and SELECT Down together for one
second.
PHASE
The output PHASE setup screen
allows the audio output phase to
be inverted. The SEL Up and Down
buttons can be used to toggle between normal and inverted phase.
Press MENU to leave this screen.
SmtNR
The SmtNR (Smart Noise Reduction) setup screen (available in 400
Series compatibility mode only)
places the Smart Noise Reduction
algorithm in one of three modes. In
the OFF position, no noise reduction is applied, for complete transparency. In the NORMAL position
(factory default setting), a moderate amount of noise reduction is
applied, dramatically reducing
hiss with virtually no discernible
side effects. In the FULL position, the transparency is
superior to the Lectrosonics noise reduction system
used for many years in the 195 and 200 series systems.
Try switching between the three modes to decide what
setting is correct for your application. Refer to the Smart
Noise Reduction section in the GENERAL TECHNICAL
DESCRIPTION chapter for more detailed information
about this feature.
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UCR401
TUNING
The Tuning setup screen allows
selection of one of four factory
set frequency groups (Groups A
through D), two user programmable
frequency groups (Groups U and V)
or the choice to not use groups at all.
In the four factory set frequency groups, eight frequencies per group are preselected. These frequencies are
chosen to be free of intermodulation products. (See
Frequency Coordination.)
In the two user programmable frequency groups, up to
16 frequencies can be programmed per group.
Note: The Tuning Setup Screen only selects the
tuning mode (NORMAL or Group Tuning) and
not the operating frequency. Actual operating
frequencies are chosen through the Frequency
Window.
If NORMAL tuning mode is selected, the SEL Up and
Down buttons select the operating frequency in single
channel (100 kHz) increments and the MENU+Up and
MENU+Down shortcuts tune in 16 channel (1.6 MHz)
increments.
There are two group tuning modes: factory preset
groups (Grp A through D) and user programmable frequency groups (Grp U and V).
In these modes, the SEL Up and Down buttons navigate among the selected intermod-free frequencies in
the group (and the MENU+Up and MENU+Down shortcuts jump to the first and last frequencies in the group.)
Also, a lower case a, b, c, d, u or v will be displayed to
the immediate left of the transmitter switch settings in
the Frequency Window. The letter identifies the selected
factory or user tuning group.
Any time the currently tuned frequency is not in the current tuning group, the group tuning mode indicator will
blink. Any time the currently tuned frequency is in the
current tuning group, the group tuning mode indicator
will give a steady (non-blinking) indication.
If a factory tuning group has been selected, pressing
either the SEL Up or Down button will select the nearest
factory selected frequency in that group above or below
the current frequency.
User Programmable Frequency Group Behavior
The user programmable frequency groups “U” or “V”
work very similarly to the factory groups with a few
exceptions. The most obvious difference is the ability to
add or remove frequencies from the group. Less obvious is the behavior of a user programmable frequency
group with only one, or no entries.
A user programmable frequency group with only one
entry continues to display the single frequency stored
in the group no matter how many times the SEL Up or
Down buttons are pressed (provided the MENU button
is not pressed at the same time). The “U” or “V” will not
blink.
A user programmable frequency group with no entries
reverts to non-group-mode behavior, i.e., access is
allowed to all 256 available frequencies in the selected
receiver module’s frequency block. When there are no
entries, the “U” or “V” will blink automatically. However,
once a frequency has been added to the tuning group,
this behavior changes to group-mode behavior where
the MENU button must be pressed and held while either
the SEL Up or Down buttons are pressed to access
frequencies that are not part of the current tuning group.
Adding/Deleting User Programmable
Frequency Group Entries
Note: Each User Programmable Frequency Group
(“u” or “v”) has separate contents. We recommend
that you review the section titled Frequency
Coordination prior to adding frequencies in order
to minimize potential intermodulation problems.
1. Start from the Frequency Window and verify that a
lower case “u” or “v” is present next to the transmitter switch settings.
2. While pressing and holding the MENU button press
either the SEL Up or Down button to move to one of
the 256 available frequencies in the block. Whenever the selection comes to rest on a frequency that is
in the current group, the group tuning mode indicator (letter “u” or “v”) will give a steady indication. On
frequencies that are not in the group, the indicator
will blink.
3. To add or remove the displayed frequency from the
group, hold down the MENU button while pressing
and holding the SEL Up button. The group tuning
mode indicator will stop blinking to show that the
frequency has been added to the group, or begin
blinking to indicate that the frequency has been
removed from the group.
COMPAT
The COMPAT setup screen selects
the type of transmitter used with the
UCR401. The available modes are:
400 - Lectrosonics 400 Series.
This is the default setting and should be used if your
transmitter supports it. This mode offers the best audio
quality.
100 - Lectrosonics 100 Series compatibility mode.
200 - Lectrosonics 200 Series compatibility mode.
IFB - Lectrosonics IFB compatibility mode.
MODE 3 and MODE 6 - Compatible with certain non-
Lectrosonics transmitters.
14
LECTROSONICS, INC.
Frequency Scan Mode
UHF Digital Hybrid Wireless® Receiver
Scan & View Window Elements
Cursor - shows relative position
of the scanner within the
25 MHz band of the receiver.
Scan level
indications - showing
relative level of RF
activity across the
25 MHz bandwidth of
the receiver.
To use the integrated scanning function, press both SEL
Up/Down buttons and the MENU button at the same
time. The display will switch to the SCAN WINDOW
and start scanning immediately. Data gathered during a
scan is stored until it is purposely erased or the power
is turned off. Previous data will remain and subsequent
scans can be made to search for additional signals or to
accumulate higher peaks.
To stop scanning, press the MENU button once. The
scanning will stop immediately, and the display will
switch to the VIEW window. In this window, each vertical
band of the display represents 8 frequencies (800 kHz).
Pressing the SEL Up or Down buttons will scroll the
cursor coarsely across the tuning range. The transmitter switch settings matching the frequency indicated by
the cursor are shown in the upper right corner of the
screen.
Spectrum data is collected only when the receiver is
scanning. Successive scanning with repeated passes
through the tuning range will accumulate the highest
peaks encountered to aid in finding clear frequencies.
To clear the scan memory without leaving scan mode,
turn the power switch off and back on quickly.
Pressing the MENU button once again will shift the
display to the FINE VIEW window which shows an expanded portion of the spectrum around the cursor.
In the FINE VIEW window, each vertical band represents one frequency the UCR401 is capable of tuning.
The upper right corner shows the transmitter switch
settings for the frequency indicated by the cursor. In this
Switch Settings - shows the
transmitter switch settings
- will change rapidly while the
unit is scanning.
Remaining unscanned
part of band.
Fine View Window Elements
Transmitter
Cursor (center bar)
RF Level indicators
screen, a vertical center bar 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 by pressing the SEL Up and Down buttons.
Pressing the SEL Up button will make the display scroll
left, showing higher frequencies. Pressing the SEL
Down button will make the display scroll right, showing
lower frequencies. The cursor remains in place while
the display scrolls left or right
The scanning mode is used to find a clear operating frequency. Scroll through the screen and find a frequency
where no RF signals (or in the worst case, only very
weak RF signals) are present. With the cursor on this
frequency, simultaneously press the SEL Up, Down and
MENU buttons to leave the scan mode.
When leaving the scan mode, you are given the option
of using the frequency the unit was on before entering
the scan mode, or using the frequency just selected in
the scan mode. The display shows USE OLD and USE
NEW to prompt you to make a frequency selection.
To accept the new frequency just selected in the scan
mode, press the SEL Down button for USE NEW. To
return to the frequency you were using before entering
the scan mode, press the SEL Up button for USE OLD.
(The MENU button defaults to USE OLD.)
Once you leave the scan mode, the Frequency Window
will be displayed. Set your transmitter switches to the
same settings as shown on the display and your system
will be ready for operation.
Switch Settings
SCROLL reminders
Rio Rancho, NM
15
UCR401
Antenna Orientation
Two antennas are used in a polarity switching, combining technique called Smart DiversityTM to provide an
immunity to dropouts caused by RF multipath reflections. Signals from the transmitter arrive in a direct path
from the transmitter and from reflections from other
directions. To make full use of diversity reception, the
antenna whips need to be spaced apart.
The whips are made of woven stainless steel and can
be bent and shaped without damaging them. Shape
them so they curve slightly away from each other for
best reception.
In the diagrams below, the antenna patterns are simplified to help illustrate the effects of different orientations.
Receiver antennas are most sensitive perpendicular to
the whip, and transmitter antennas radiate maximum
power perpendicular to the whip. Reflected signals that
occur in normal use can also be useful, but they are not
easy to predict and generally not reliable.
Good
Bad
Optimal
Vertical orientation for
maximum range
Marginal
Poor
Range is reduced if receiver
is horizontal, even though the
transmitter is vertical, or vice versa.
Range is significantly reduced
if receiver and transmitter
antennas are oriented
horizontally. In this case,
reflections may even be
stronger than direct signals.
16
LECTROSONICS, INC.
Setup and Operating Instructions
UHF Digital Hybrid Wireless® Receiver
Installing/Replacing Batteries
1. As per the instructions engraved on the Battery
Door, use your thumb to lift and open door. Then
rotate it until it is perpendicular with the case.
2. Replace the old batteries, ensuring that you observe the polarity of the batteries when installnig
the new ones.
Battery Door
Battery polarity is
shown on the side of
the housing
Adjusting Audio Output
1. Install fresh batteries or connect an external power
source to the UCR401.
2. Unless frequency settings have been previously
assigned, scan for an open frequency and set both
the receiver and transmitter to that frequency. (See
Finding Clear Frequencies.)
3. Connect the audio cable to the receiver’s Audio Out
XLR jack.
AUDIO OUT XLR Jack
4. Set the Power ON/OFF switch to ON and verify that
the LCD panel activates.
Observe Battery Polarity
“-”
“+”
3. When finished rotate the door closed. You will feel it
snap into place when it is fully closed.
Power ON/OFF Switch
5. Adjust the transmitter gain. Refer to your transmitter
manual’s 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 audio modulation indicators on the
receiver and transmitter to show full modulation on
the loudest peak audio levels. Normal levels should
cause the UCR401’s audio level icon to fluctuate
fully. This will result in the best possible signal to
noise ratio for the system.
Rio Rancho, NM
17
UCR401
Warning: A common mistake is to use the
transmitter audio gain control to set the overall
audio level of the recorder or sound system.
The transmitter gain control is only used to
set the proper modulation of the transmitter
to match the microphone placement and
talker’s voice level. Once set it should remain
untouched until the microphone, placement or
talker changes.
6. Adjust the Audio Output on the receiver for an optimal level for your recorder or sound system. Use
the LEVEL setup screen and adjust the level with
the SEL Up and Down buttons.
The input levels of different cameras, VCRs, and PA
equipment vary, which may require that you adjust
the AUDIO OUT 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 UCR401
audio output is designed to drive any audio input
device from microphone level to +5dBu line level.
Note: The test tone output is especially useful for
an exact level match. With the test tone running,
adjust for the maximum desired peak level using
the metering on the connected device.
Finding Clear Frequencies
The folllowing procedure will help you identify RF signals in the area and find clear channels for operating
the wireless system.
1. Ensure transmitter has fresh batteries and is turned
off. Turn on the receiver and wait a few seconds
until the Main Window appears on the LCD.
3. Simultaneously press the MENU and SEL Up and
Down buttons to enter Scan Mode.
4. View the LCD while the receiver is scanning. The
vertical marker will move across the display from
left to right. RF activity will be indicated by black
areas in the display.
5. RF signal strength is indicated by markings in
microvolts on the front panel to the left of the LCD.
Look for clear channels in the spectrum where
there is no RF activity. Scanning will repeat and
continue until the MENU button is pressed.
6. If necessary, press the MENU button to zoom in for
greater detail.
7. Then press the SEL Up and Down buttons to move
the marker to the middle of a clear area where
there is no RF activity. If an area with no RF activity
cannot be found anywhere in the spectrum, locate
one with the least amount of RF activity.
Vertical marker moves left to right
RF activity
Strength of RF activity is indicated in
microvolts with markings on the front panel
8. Press all three buttons (SEL Up and Down and
MENU) to move to the next screen. Two options will
Fine adjustment can be made
when zoomed closer
Move marker to area with
no RF activity
be shown.
Press the SEL Down arrow button to select the
USE NEW option and set the receiver to the new
frequency just found in scanning.
-OR-
Press the SEL Up arrow button to select USE OLD
and return to the frequency that was set before
scanning.
SEL Up Button
SEL Down Button
Press all three buttons at the same time and the receiver will
start scanning.
18
MENU Button
LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
Press all three buttons at
the same time to move to
Frequency Select Screen
SEL Up Button
SEL Down Button
MENU Button
Locking and Unlocking the UCR401
Front Panel Controls
The front panel panel controls can be “LOCKED” to
prevent accidental changes being made during operation and handling.
To UNLOCK the UCR401
Press and hold the MENU button until a bar tracks horizontally across the screen and the word “UNLOCKED”
is displayed on the LCD screen. When the unit is UNLOCKED, all settings can be altered.
The UCR401 can only be LOCKED or UNLOCKED
from any of the main windows. (There are four of them.)
Also, it cannot be switched between LOCKED and UNLOCKED modes when it is in a scanning mode or from
other subordinate screens.
MENU Button
Note: Whether locked or unlocked, the setting
persists when the unit is off and also when the
batteries are removed.
To LOCK the UCR401
Press and hold the MENU button until a bar tracks
horizontally across the LCD screen and the word
“LOCKED” appears. If the MENU button is released
before the word “LOCKED” appears, the unit will remain
UNLOCKED.
In LOCKED state, the use of the MENU and SEL Up/
Down buttons are limited to “view only” and any attempts to change selections will result in a LCD screen
displaying the word “LOCKED.” The unit cannot be used
for RF scanning when it is set in the LOCKED state.
When in a LOCKED state, the pilot tone bypass toggle
is also defeated.
Rio Rancho, NM
19
UCR401
BLOCK 22
5t
Bt
4t
At
7t
0t
5t
Dt
Dt
3t
At
7t
9t
2t
Ct
3t
5t
Bt
4t
At
4t
0t
5t
Bt
3t
Dt
2t
3t
At
0t
7t
BLOCK 24 BLOCK 25
BLOCK 24 BLOCK 25
Pre-coordinated Frequencies
Interference from IM (intermodulation) is a potential
problem in all multi-channel wireless systems, so proper
frequency coordination is always required to avoid
noise, range and dropout problems. Your options to accomplish this include:
• Usingthepre-coordinatedfrequencygroups
• Performingasystemcheckout
(See Multi-channel System Checkout)
• ContactingLectrosonicsforassistance
Groupings of compatible frequencies have been created to minimize intermodulation problems in multiple
channel wireless systems. The frequencies can be used
with Digital Hybrid and analog Lectrosonics wireless
equipment. Compatibility with other brands is likely, but
not guaranteed by Lectrosonics.
These frequencies have been calculated to minimize IM
between these frequencies only. RF signals from outside sources can still interfere with operation, so even if
only these pre-coordinated frequencies are being used,
a Multi-channel System Checkout is still necessary. See
the procedure on the next page.
Pre-coordinated frequencies
are arranged in four groups as
shown at right.
The uppermost eight
frequencies comprise Grp
a, the eight just below them
comprise Grp b, and so on.
FREQ SW SET US TV CH
563.700 0,
564.300 0,
565.200 1,
565.800 1,
567.100 2,
568.000 3,
568.500 3,
569.300 3,
575.700 7,
577.900 9,
578.600 9,
579.900 A,
581.700 B,
582.600 C,
585.200 D,
587.500 F,
BLOCK 22
FREQ SW SETUS TV CH
570.100 4,
570.700 4,
571.600 5,
572.200 5,
573.200 6,
574.400 7,
574.900 7,
575.500 7,
581.100 B,
582.100 B,
582.600 C,
584.300 D,
585.000 D,
585.600 E,
586.300 E,
588.100 F,9 tv32
v29
v29
v29
v29
v30
v30
Grp a
v30
v30
v31
v31
v32
v32
Grp b
v32
v32
v33
v33
v30
v30
v30
v31
Grp c
v31
v31
v31
v31
v32
v32
v32
v32
v32
v32
Grp d
v32
and as “Grp a” through “Grp d” in VRpanel
Displayed as “GROUP a” through “GROUP d” in the LCD
Compatibility follows the pattern illustrated in the diagram at right.
Grp a and Grp b contain the 16 frequencies shown in
the table below (upper orange/white set).
Grp c and Grp d contain the 16 frequencies shown in
the table below (lower blue/white set).
NOTE: There is no assurance that frequencies
are compatible between the upper orange/white
set and the lower blue/white set. Combined use of
frequencies from both sets requires testing with
the procedures outlined in the following section
entitled Multi-channel System Checkout
These frequencies share RF spectrum with TV channels. TV station broadcast signals are much more
powerful than a wireless microphone transmitter, and
can easily mix with the signals from the wireless system
to produce a variety of interference problems. Even if
these pre-coordinated frequencies are being used, it is
always a good idea to go through the checkout procedure on the following page.
Active TV station and other external signals can be
discovered by scanning with the receiver.
All 16 within the
same block are
compatible
The upper eight are
compatible with the
lower eight in the
adjacent blocks.
The lower eight are
compatible with the
upper eight in the
adjacent blocks.
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,5tv43
621.900 4,Btv39 647.500 4,Btv43
622.800 5,4tv39 648.400 5,4tv43
623.400 5,Atv39 649.000 5,Atv43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,0tv44
626.100 7,5tv40 651.700 7,5tv44
626.700 7,Btv40652.300 7,Btv44
632.300 B,3tv41657.900 B,3tv45
633.300 B,Dtv41658.900 B,Dtv45
633.800 C,2tv41659.400 C,2tv45
635.500 D,3tv41661.100 D,3tv45
636.200 D,A tv41661.800 D,Atv45
636.800 E,0tv41 662.400 E,0tv46
637.500 E,7tv41 663.100 E,7tv46
639.300 F,9tv42 664.900 F,9 tv46
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,5tv43
621.900 4,Btv39 647.500 4,Btv43
622.800 5,4tv39 648.400 5,4tv43
623.400 5,Atv39 649.000 5,Atv43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,0tv44
626.100 7,5tv40 651.700 7,5tv44
626.700 7,Btv40652.300 7,Btv44
632.300 B,3tv41657.900 B,3tv45
633.300 B,Dtv41658.900 B,Dtv45
633.800 C,2tv41659.400 C,2tv45
635.500 D,3tv41661.100 D,3tv45
636.200 D,A tv41661.800 D,Atv45
636.800 E,0tv41 662.400 E,0tv46
637.500 E,7tv41 663.100 E,7tv46
639.300 F,9tv42 664.900 F,9 tv46
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,5tv43
621.900 4,Btv39 647.500 4,Btv43
622.800 5,4tv39 648.400 5,4tv43
623.400 5,Atv39 649.000 5,Atv43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,0tv44
626.100 7,5tv40 651.700 7,5tv44
626.700 7,Btv40652.300 7,Btv44
632.300 B,3tv41657.900 B,3tv45
633.300 B,Dtv41658.900 B,Dtv45
633.800 C,2tv41659.400 C,2tv45
635.500 D,3tv41661.100 D,3tv45
636.200 D,A tv41661.800 D,Atv45
636.800 E,0tv41 662.400 E,0tv46
637.500 E,7tv41 663.100 E,7tv46
639.300 F,9tv42 664.900 F,9 tv46
20
LECTROSONICS, INC.
Frequency Coordination
IM (intermodulation) is a process of two or more RF
signals mixing in any stage in the transmitter or receiver
that generates another RF signal. If this new signal
happens to land on a carrier, IF or oscillator frequency
you may have interference problems that affect range
or audio quality. The possible combinations also include
odd and even order harmonics of the carriers.
Feel free to contact the factory if you need help in coordinating frequencies. A specialized computer program is
used to perform thousands of calculations and identify
various interfering signals. Potential problems and trouble areas can be identified in advance, and proposed
new frequencies or other solutions can be suggested.
This service is offered to authorized Lectrosonics dealers and other customers who are using Lectrosonics®
wireless microphone and wireless IFB systems.
Even with thorough analysis, interference can still be
present from local sources that cannot be predicted in
advance. This makes it mandatory to check out a multichannel system before the production or use begins.
Multi-channel System
Checkout
Intermodulation (IM) and crosstalk increases as the
distance between transmitters and receiver decreases.
In order to conduct a valid checkout of multi-channel
compatibility using the procedure shown here, it is best
to adhere to the following guidelines:
• 4to5feetbetweentransmitters
• 20to25feetbetweentransmittersandreceiver
antennas
• Receiverantennasnottouchingoneanother
If the distances are less than this, IM will be exaggerated and not likely to be realistic. If the distances are
greater than this, IM products that could occur during
actual use that may not show up in the checkout procedure.
Interference can result from a wide variety of sources
including TV station signals, other wireless equipment
in use nearby, or from intermodulation within a multichannel wireless system itself.
The pre-coordinated frequencies in the tables on the
previous pages address in-system compatibility, but
obviously do not take into account RF signals from
external sources that may be present in the location
where the system will be operating.
UHF Digital Hybrid Wireless® Receiver
The scanning process will identify external RF signals,
but it does not address the compatibility of the selected
frequencies. Always go through the following steps to
make sure the frequencies that are chosen are compatible within themselves and also free from external
interference.
1. Set up the system for testing. Place antennas in
the position they will be used and connect to the
receivers. Place transmitters about 4 to 5 feet apart
and about 20 to 25 feet from the receiver antennas.
If possible, have all other equipment on the set,
stage or location turned on as well, especially any
mixing or recording equipment that will be used with
the wireless system.
2. Turn on all receivers. Leave transmitters off.
Look at the RF level display on each receiver. If
an indication is present, change the frequency to
a clear channel where no signal is indicated. If a
completely clear channel cannot be found, set it for
the one with the lowest RF level indication. Once all
receivers are on clear channels, go to the next step.
3. Start with all transmitters turned off. Then turn
on one transmitter at a time. Look at the matching
receiver to verify a strong RF signal is received.
Then, look at the other receivers and see if one of
them is also picking up the signal. Only the matching receiver should indicate a signal. Change frequencies on either system slightly until it will pass
this test, then check again to see that all receivers
are still on clear channels as in Step 2. Repeat this
procedure for each transmitter, one at a time.
4. With all transmitters and receivers turned on,
turn each transmitter OFF one at a time. Look at
the RF level indicator on the receiver that matches
the transmitter that is turned off. It should “fall silent”
and the RF level should disappear or drop to a very
low level. If it does not, change the frequency on
that receiver and transmitter and try it again.
IMPORTANT: Any time a frequency is changed on
any of the systems in use, you must start at the
beginning and go through this procedure again for
all systems. With a little practice, you will be able to
do this quickly and save yourself some grief.
Rio Rancho, NM
21
UCR401
Pilot Tone Bypass
Some wireless equipment uses a supersonic “pilot tone”
to control the squelch (audio mute) of a receiver module
to keep it silent until a valid signal is received. When a
signal with the correct pilot tone is received, the squelch
opens and audio is delivered to the output. Pilot tone
squelch control also eliminates transients (clicks and
pops) when transmitters are turned on and off. Pilot
tone is supported in the Digital Hybrid compatibility
modes for those systems that use it.
Pilot tone control can be bypassed as a diagnostic tool.
Bypass opens the audio output of the receiver unconditionally, allowing you to listen to any signals entering the
receiver to help identify their source. Pilot tone bypass
will also allow you to use a transmitter that has a defective pilot tone circuit.
CAUTION: When pilot tone is bypassed and
the transmitter is turned off, excessive noise
will be present. Turn the audio level down
before bypassing pilot tone.
22
LECTROSONICS, INC.
Replacement Parts and Accessories
CCMINI
Zippered, padded vinyl system pouch
DCR12/A4U
Power Supply; 90-240 VAC, 50/60 Hz input;
12 VDC (regulated), 400 mA max. output.
VSR1
Thin velcro loop for power cable strain relief.
PS70
A/C power supply with 3-pin NEMA socket on hous-
ing, 100-240 VAC input; 13.8 VDC, 2.8 A (max.)
output.
21425
6 ft. long power cord; coaxial to stripped & tinned
leads. Coaxial plug: ID-.080”; OD-.218”; Depth- .5”.
Fits all compact receiver models that use CH12
power supply.
21472
6 ft. long power cord; coaxial to stripped & tinned
leads. Right angle coaxial plug: ID-.075”; OD-.218”;
Depth- .375”. Fits all compact receiver models that
use CH12 power supply.
CCMINI
DCR12/A4U
UHF Digital Hybrid Wireless® Receiver
Mating power plug dimensions
21425
.475”
21472
.375”
VSR1
.375” O.D.
PS70
.35”
.375” O.D.
Rio Rancho, NM
23
UCR401
Troubleshooting
Symptom Possible Cause
INITIAL POWER ON
LCD display not active or lit External power supply disconnected or inadequate.
Wrong polarity power source. The external power input jack requires
POSITIVE (+) to be on the center pin. Battery gets warm and doesn’t
work.
Battery may be low. Try fresh batteries.
Version message shows DSP or COM This indicates an internal error. Please contact the factory for
assistance.
Display indicates CHECK FREQ This is a warning that a strong RF signal is present that is not
centered on the channel, and the audio is likely to be distorted.
There are three principal causes:
1) The transmitter is set to the wrong channel, but close to the
the correct channel. Check frequency setting of transmitter.
2) A foreign signal is causing the condition, such as from a local
TV station or from intermodulation from another transmitter.
Retune the receiver and transmitter to a clear frequency.
3) The transmitter carrier frequency is not correct (rare occurence).
Contact factory for repair.
If any of these solutions don’t remove the warning message, the
transmitter or receiver may need repair.
PILOT TONE SQUELCH
Pilot Tone indicator (P) present, but no sound (Check audio meter first)
Audio output cable bad or disconnected.
Audio Output level too low. Use the built-in test tone to verify levels.
Pilot Tone Indicator (P) keeps flashing when transmitter turned on
Pilot tone detection can take several seconds. Turn on the transmitter
power (and the audio switch on some models) and wait 3 to 5 seconds
for the “P” to indicate steadily.
Transmitter and receiver not on same frequency.
Receiver compatibility mode does not match the transmitter in use.
(See Menu Selections from Main Window, COMPAT Window.)
Noise on audio and Pilot Tone Indicator is “b”
The pilot tone bypass has been activated. Hold MENU and press UP
to reset (works only from the Main Window).
Pilot Tone Indicator not present but receiving audio
Receiver is set to a compatibility mode that doesn’t use Pilot Tone.
Check that receiver compatibility mode matches the transmitter in use
as any sufficiently strong signal can unsquelch the receiver in this
mode, compatible or not.
NOTE: In the 400 Series, 200 Series and Mode 6 compatibility modes, 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).
In the other compatibility modes, no pilot tone is used and the “P” is never displayed. Audio is present whenever the
receiver detects a sufficiently strong signal.
Regardless of the compatibility mode, activating the “pilot bypass” function causes a lowercase “b” to appear in the pilot
indicator position on the main window and forcibly unsquelches the audio.
24
LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
Symptom Possible Cause
ANTENNAS AND RF SIGNAL STRENGTH
RF Level is weak Receiver may need to be moved or reoriented.
Antenna on transmitter or receiver may be defective or poorly
connected - double check antennas.
Improper length of antenna, or wrong antenna on transmitter or
receiver. 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.
AUDIO SIGNAL QUALITY
Poor signal to noise ratio Transmitter gain set too low.
The noise may not be in the wireless system. Turn the transmitter
audio gain all the way down and see if the 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 UCR401 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 UCR401 and lowering the
input gain on the device the UCR401 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 audio meter in the main window.
Audio output level too high for the device the UCR401 is feeding.
Lower the output level of the UCR401.
Bad frequency response or generally poor audio quality
Ensure the receiver is set to the compatibility mode that matches
the transmitter in use.
Rio Rancho, NM
25
UCR401
Specifications and Features
Operating Frequencies (MHz):
Block 470: 470.100 - 495.600
Block 19: 486.400 - 511.900
Block 20: 512.000 - 537.500
Block 21: 537.600 - 563.100
Block 22: 563.200 - 588.700
Block 23: 588.800 - 607.900 and
614.100 - 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
Block 28: 716.800 - 742.300
Block 29: 742.400 - 767.900
Block 944: 944.100 - 951.900
Frequency Adjustment Range: 25.5 MHz in 100kHz steps
Channel Seperation: 100 kHz
Receiver Type: Triple conversion,
superheterodyne, 244 MHz,
10.7 MHz and 300 kHz
Frequency Stability: ±0.001 %
Front end bandwidth: 30 MHz @ -3 dB
Sensitivity
20 dB Sinad: 1 uV (-107 dBm), A weighted
60 dB Quieting: 1.5 uV (-104 dBm), A weighted
Squelch quieting: Greater than 100 dB
AM rejection: Greater than 60 dB, 2 uV to 1 Volt
(Undetectable after processing)
Modulation acceptance: 85 kHz
Image and spurious rejection: 85 dB
Third order intercept: +0 dBm
Diversity method: SmartDiversity
FM Detector: Digital Pulse Counting Detector operating
at 300 kHz
Antenna inputs: Two, fixed whip
Audio outputs
Rear Panel XLR: Adjustable from -50dBu to +5dBu
in 1 dB steps. Calibrated into a
typical 10 k Ohm balanced load.
Can drive 600 Ohm load.
TM
phased antenna combining
Audio Performance (overall system): (These specs apply to 400 Series mode only.)
Frequency Response: 32 Hz to 20 kHz (+/- 1dB)
THD: 0.2% (typical)
Signal to Noise Ratio (dB):
(overall system, 400 Series mode)
Note: The dual envelope “soft”
limiter provides exceptionally good
handling of transients using variable
attack and release time constants. Once activated, the limiter compresses 30+ dB of transmitter
input range into 4.5 dB of receiver output range, thus reducing the measured figure for SNR
without limiting by 4.5 dB
Total Harmonic Distortion: 0.2% typical (400 Series mode)
Input Dynamic Range: 125 dB (with full Tx limiting)
Rear Panel Controls and features: XLR audio output jack;
External DC input;
Battery compartment access
Power Options:
Ext DC: Minimum 6 Volts to maximum 18 Volts DC;
150 mA at 6 VDC; 75 mA at 18 VDC
Int Batt: Two AA 1.5 Volt alkaline, lithium or
NiMH (270 mA @ 3V)
Battery Life:
AA alkaline 4 hours continuous
AA NiMH 8 hours (2500 mAH)
AA lithium Up to 21 hours (continuous and
intermittent usage are the same)
Weight: 13 oz. with batteries
Dimensions: 2.83” wide x 1.25” high x 4.64” deep
(2.83 mm x 32 mm x 118 mm)
Specifications subject to change without notice
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
Front Panel Controls and Indicators:
LCD control panel Main window: Pilot tone; antenna phase, receiver battery
level; transmitter battery status; audio level,
RF level
Frequency window: Frequency, TV channel;
Transmitter switch setting
Audio output level adjustment: -50 dBu to +5 dBu
Battery level tracking: Receiver (AA battery) in 1/10th volt
steps, accuracy +/- 0.2V.
Transmitter (AA battery) x.xxV
format, accuracy +/- 0.1V.
Timer option available when NiMH used.
Scanning mode: Coarse and fine modes for RF spectrum
site scanning
Audio test tone: 1 kHz, -50 dBu to +5 dBu output, 1% THD
Transmitter battery type selection: 9V alkaline, 9V lithium, AA alkaline,
AA lithium, NiMH
Phase invert: Audio output phase normal or inverted
SmartNR (noise reduction): OFF, NORMAL, FULL modes
(available in 400 Series mode only)
26
LECTROSONICS, INC.
UHF Digital Hybrid Wireless® Receiver
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 the interconnecting cables and then go through the Troubleshooting section in this 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 connection, 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
For timely service, please follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by email 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 A.M. to 4 P.M. (U.S. 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 dam-
age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Lectrosonics USA:
Mailing address: Shipping address: Telephone:
Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501
PO Box 15900 581 Laser Rd. (800) 821-1121 Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax
USA USA
Web: E-mail:
www.lectrosonics.com sales@lectrosonics.com
Lectrosonics Canada:
Mailing Address: Telephone: E-mail:
49 Spadina Avenue, (416) 596-2202 Sales: colinb@lectrosonics.com
Suite 303A (877) 753-2876 Toll-free Service: joeb@lectrosonics.com
Toronto, Ontario M5V 2J1 (877-7LECTRO)
(416) 596-6648 Fax
Rio Rancho, NM
27
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. or an authorized
dealer, 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.
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.com
29 July 2013
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