INSTRUCTION MANUAL
UCR411A
Digital Hybrid Wireless® Compact UHF Receiver
(US patent 7,225,135)
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Rio Rancho, NM, USA
www.lectrosonics.com
UCR411A
2
LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
Digital Hybrid Wireless
The Lectrosonics Digital Hybrid WirelessTM uses innovative technology to combine the new advantages of digital
audio with the classic 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 being transmit-
®
ted 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.
Unlike traditional analog compandor systems, no artifacts are introduced under strong RF conditions.
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.
(*US Patent 7,225,135)
Rio Rancho, NM
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UCR411A
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LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
Table of Contents
Digital Hybrid Wireless
General Technical Description ..............................................................................................................................................................6
Compatibility Modes ..............................................................................................................................................................................6
Diversity Reception ...............................................................................................................................................................................6
RF Frequency Tracking Front-End and Mixer ........................................................................................................................................6
Microcontroller, PLL and VCO Circuits..................................................................................................................................................6
IF Amplifiers and SAW Filters ...............................................................................................................................................................7
Digital Pulse Counting Detector ............................................................................................................................................................7
DSP-Based Pilot Tone ...........................................................................................................................................................................7
Supersonic Noise-Based
Dynamic Filter and SmartSquelch
Smart Noise Reduction (SmartNR™) ....................................................................................................................................................7
Audio Output Level ................................................................................................................................................................................ 8
Test Tone ...............................................................................................................................................................................................8
Batteries ................................................................................................................................................................................................ 8
Power Supply ........................................................................................................................................................................................ 8
LCD Display ..........................................................................................................................................................................................8
Power Off ..............................................................................................................................................................................................8
Front Panel Controls and Functions .....................................................................................................................................................9
LCD Screen ..........................................................................................................................................................................................9
MENU Button ........................................................................................................................................................................................9
SELECT Up/Down Buttons ...................................................................................................................................................................9
Power ON/OFF Switch .......................................................................................................................................................................... 9
Rear Panel Features ...............................................................................................................................................................................9
XLR Audio Output Jack .........................................................................................................................................................................9
Power Input Jack ...................................................................................................................................................................................9
Main Window (LCD) .............................................................................................................................................................................. 10
Menu Selections from Main Window ...................................................................................................................................................11
Frequency Window..............................................................................................................................................................................11
Battery Level Window .........................................................................................................................................................................11
SETUP Window ..................................................................................................................................................................................12
LEVEL Setup Screen ..........................................................................................................................................................................12
TONE Setup Screen ...........................................................................................................................................................................12
TXBAT Setup Screen ..........................................................................................................................................................................12
PHASE Setup Screen .........................................................................................................................................................................12
SmartNR Setup Screen ......................................................................................................................................................................12
TUNING Setup Screen .......................................................................................................................................................................13
COMPAT Setup Screen .......................................................................................................................................................................13
Frequency Scan Mode .........................................................................................................................................................................14
Scan & VIEW WINDOW Elements ......................................................................................................................................................14
Fine VIEW WINDOW Elements ..........................................................................................................................................................14
Antenna Use and Placement ...............................................................................................................................................................15
Installation and Operating Instructions ..............................................................................................................................................16
Finding Clear Frequencies ..................................................................................................................................................................16
Locking and Unlocking the
UCR411A Front Panel Controls .......................................................................................................................................................... 17
Replacing the Batteries ........................................................................................................................................................................18
Antenna/Block Reference Table ..........................................................................................................................................................19
Pre-coordinated Frequencies ..............................................................................................................................................................20
Diagnostics ...........................................................................................................................................................................................21
Multi-channel System Checkout..........................................................................................................................................................21
Pilot Tone Bypass ................................................................................................................................................................................21
Replacement Parts and Accessories ..................................................................................................................................................22
Troubleshooting .................................................................................................................................................................................... 23
Specifications and Features ................................................................................................................................................................25
Service and Repair ...............................................................................................................................................................................26
Returning Units for Repair ..................................................................................................................................................................26
® ....................................................................................................................................................................................................................................................................................................3
™ ....................................................................................................................................................................................................................................................................7
Rio Rancho, NM
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UCR411A
General Technical Description
UCR411A Block Diagram
The UCR411A is a portable, high performance, tripleconversion, frequency synthesized, UHF receiver fully
compatible with all Lectrosonics 400 Series transmitters
(and some other transmitter types – see Compatibility
Modes for details). The RF performance is extremely
stable over a very wide temperature range, making the
UCR411A perfectly suited to the rough environmental
conditions found in the field. The proprietary audio processing includes a digital signal processor for very low
distortion and a superior signal-to-noise ratio.
The UCR411A front panel features a menu-driven LCD
graphic display and three control buttons to conveniently view and alter user settings. The main window,
for example, displays the pilot tone indicator, antenna
diversity phase, RF level, audio level, receiver battery
status and transmitter battery status. It is also possible
to bypass the pilot tone/squelch from the main display
window. Other windows display operating frequency,
audio output level, battery voltage and test tone status.
The frequency scan mode provides a spectrum analyzer for a graphical means of observing all signals “on the
air” within the frequency range of the receiver in order to
find operating frequencies that are free of interference.
Compatibility Modes
The UCR411A receiver was designed to operate with
Lectrosonics 400 Series transmitters and will yield the
best performance when doing so. Due to the flexibility
of digital signal processing, the UCR411A is also able
to operate with Lectrosonics 200 Series, Lectrosonics
100 Series, IFB Mode, as well as Modes 3 and 6, which
work with certain non-Lectrosonics transmitters.
Diversity Reception
The UCR411A technology with SMARTDiversity™ minimizes dropouts in situations where multi-path reflections can cause serious problems. The phase diversity
network and PIN diode RF switches are controlled by
the microprocessor using a sophisticated algorithm to
use both antennas simultaneously. This design keeps
the receiver compact enough for camera mounting or
shoulder bag applications, yet provides effective diversity reception.
RF Frequency Tracking Front-End and Mixer
The receiver 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 UCR411A has a frequency selective front-end section that tracks and tunes
to the desired signal frequency and rejects or “tunes
out” unwanted interfering signals. The design consists
of four varactor tuned ceramic transmission line resonators controlled by the microprocessor to provide good
selectivity. The low noise high current RF amplifier was
designed with feedback regulation for stability and precise gain in order to handle stronger RF signals without
output overload. The first mixer is of new GaAs technology that has a very high third order intercept point. This
produces a robust front-end that is as selective as fixed
single frequency designs and is suitable for use in close
proximity to other receivers and transmitters commonly
used in field production “bag” systems.
Microcontroller, PLL and VCO Circuits
The 8-bit microcontroller is truly the “heart” of the
UCR411A 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 UCR411A
design and the advanced technology of the microprocessor control arguably set a new standard in wireless
microphone development.
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LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
IF Amplifiers and SAW Filters
The first IF low noise amplifier is controlled with feedback regulation and drives the first of two quartz SAW
(Surface Acoustical Wave) filters. The 244 MHz SAW
filters combine sharp tuning, constant group delay,
wide bandwidth and excellent temperature stability, far
superior to conventional LC filters. The 244 MHz first IF
signal is converted down to 10.7 MHz, filtered through
two ceramic filters for sharp selectivity, then converted
to 300 kHz.
Digital Pulse Counting Detector
The UCR411A 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
Note: This description applies only in 400 Series
mode. In 100 and 200 Series mode, and Mode 6,
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.
The 400 Series system design uses a DSP-generated
ultrasonic pilot tone to control the receiver audio muting
(squelch). Brief delays when the associated 400 Series
transmitter is turned on or off, eliminate thumps, pops
or other transients that can occur when the power is
switched 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 the need for fragile crystals, allowing the
receiver to survive shocks and mishandling much better
than older analog-based pilot tone systems.
Supersonic Noise-Based
Dynamic Filter and SmartSquelch
In addition to SmartNR, all 400 Series receivers are
equipped with a supersonic noise-based dynamic filter
and squelch system. The incoming audio is monitored for
energy above 22 kHz, besides the pilot tone. 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 lowpass 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.
™
The UCR411A 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 can be cut off.
The UCR411A 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 UCR411A 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. (See Front Panel Controls and Functions.)
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 UCR411A 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 transmitter’s 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 and thus
increase the effective dynamic range of the system, the
UCR411A 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’ 195 and 200 Series designs,
much greater transparency is thus obtained. Desired
high frequency signals having some coherence such as
speech sibilance and tones are not affected.
The Smart Noise Reduction algorithm has three modes
- OFF/NORMAL/FULL - selectable from a user setup
screen. 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,
the factory default setting, enough noise reduction is
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UCR411A
applied to remove most of the hiss from the mic preamp
and some of the hiss from lavaliere microphones. The
noise reduction benefit is dramatic 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. This additional noise reduction comes at the cost of some transparency for low-level room noise, yet the algorithm remains undetectable
under most circumstances.
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 UCR411A, 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 UCR411A operates on two 9 Volt alkaline or LiPolymer rechargeable batteries.
NOTE: Do not use an alkaline and a LiPolymer
rechargeable in the same unit. Standard or “heavy
duty” batteries are not recommended.
Power Supply
The UCR411A may be operated from an external DC
power source (see Specifications and Features section
for allowed voltages.) The receiver has a built-in PolyFuse to protect the unit. This fuse automatically resets if
the power supply is disconnected for about 15 seconds.
The power section also has protection circuits that prevent damage to the receiver 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 times out and reverts back to
last screen used when reactivated.
Power Up Sequence
The power up sequence consists of four messages that
appear automatically after the power is switched on.
1) UCR411A
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
XXX
Where “XXX” is one of the following:
NA 400 North American - Native 400 Series Digital Hybrid mode
NA 100 Lectrosonics 100 Series compatibility
NA 200 Lectrosonics 200 Series compatibility
NA M3 Compatible with certain non-Lectrosonics transmitters
NA IFB Compatible with all Lectrosonics IFB transmitters.
NA M6 Compatible with certain non-Lectrosonics transmitters
NA M7 Compatible with certain non-Lectrosonics transmitters
EU HBR European Union - Native 400 Series Digital Hybrid mode
EU 100 European Union - 100 Series compatibility
EU 200 European Union - 200 Series compatibility
EU M3 European Union - Compatible with certain
non-Lectrosonics transmitters
EU IFB European Union - Compatible with all Lectrosonics
IFB transmitters.
EU M6 European Union - Compatible with certain
non-Lectrosonics transmitters
EU M7 European Union - Compatible with certain
non-Lectrosonics transmitters
Note: NA M7 & EU M7 are only available with firmware
6.0 on the audio board.
4) TUNING
NORMAL Tune in single channel increments.
GRP x Tune in pre-coordinated intermod-free frequencies (x is A, B, C, D, U or V)
The Main Window appears after the introductory messages are displayed.
The UCR411A 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.
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LECTROSONICS, INC.
Front Panel Controls and Functions
UHF Digital Hybrid Wireless™ Receiver
LCD Screen
The LCD Screen is a graphics-type Liquid Crystal
Display that is used to monitor system operation and
configure the UCR411A.
MENU Button
The MENU button steps through the four primary windows and setup screens.
SELECT Up/Down Buttons
The SELECT Up/Down buttons are used to select various options within each display selection and to set 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.
Rear Panel Features
XLR Audio Output Jack
This is a standard XLR configuration with pin 2 “positive” with reference to hand-held and plug-on transmitters. With lavaliere microphones and belt-pack transmitters, however, phase will vary with different types of
microphones (2-wire vs. 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.
SELECT Up Button MENU Button
SELECT Down Button
BATTERY DOOR
To open lift
this edge and
turn door
LCD Screen
Audio Output Jack
AUDIO
OUT
Power ON/OFF Switch
12
3
10-18
VDC
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
until the reversed polarity condition is fixed. The small
Velcro strip can be used as a strain relief and retainer
on the power cable to avoid accidental disconnection.
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.
Rio Rancho, NM
Power Input Jack
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UCR411A
Main Window (LCD)
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
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.)
Icon
Description
Pilot Tone Indicator
A steady “P” icon will be displayed when a pilot tone from the transmitter is present, in those compatibility modes which use pilot tone: 200 Series, Digital Hybrid (400 Series), IFB and Mode 6.
The icon will blink if no pilot tone is present from the transmitter, and it 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 receiver will produce loud noise when no matching transmitter signal is
being received, regardless of which compatibility mode is selected.
SELECT UP Button
RF level - Top of icon aligns
SELECT DOWN Button
Audio Level - Right side of icon
aligns with value on dB scale
with value on uV scale
MENU Button -
Changes windows
Power ON/OFF
switch
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 from 1uV to 1000uV on the bezel to the left of the LCD display.
Audio Level
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 SEL Down together for one second.
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LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
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 - Indicates the television broadcast channel (xx) this frequency falls
within.
Transmitter switch settings (AE in the illustration)
-These are the correct switch 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 left hand corner of the Frequency
window.
Note: NA M7 & EU M7 are only
available with firmware 6.0 on the
audio board.
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.
Tuning shortcuts: In NORMAL tuning mode, MENU+UP
and MENU+DOWN tune in 16 channel increments for
faster tuning. In the group tuning modes, MENU+UP
jumps to the first frequency in the group and
MENU+DOWN jumps to the last one in the group.
Battery Level Window
This window shows the transmitter (TX) and receiver (RX) battery
voltage. These levels will flash when
there will be about one hour operating time remaining. 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 ac-
curacy.)
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UCR411A
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 setup screens allows the user to change the associated operating parameters. Pressing the MENU
button accesses whatever mode is identified in the
Setup window. Pressing the MENU button whenever
EXIT is displayed returns the user to the Main window.
LEVEL Setup Screen
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 Setup Screen
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 the received audio
and test 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 Setup Screen
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.
9V LTH Transmitter uses a 9V lithium battery. Moni-
tor 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. Moni-
tor 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, hold MENU and
SEL Down together for one second.
PHASE Setup Screen
The 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.
SmartNR Setup Screen
The SmartNR 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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LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
TUNING Setup Screen
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.
Note: User Group Tuning available in units with
firmware version 3.0 and above.
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.
Frequency Window Behavior
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 types of group tuning modes: factory preset groups (Grp A through D) and user programmable
frequency groups (Grp U and V).
When using Group Tuning, 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, indicating which group is selected. If currently tuned frequency
is not in the current tuning group, the indicator will blink.
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 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 will only display that one frequency regardless
of how many times the SEL Up or Down buttons are
pressed (providing the MENU button is not pressed at
the same time).
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. 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. It is suggested
to 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
for about a second. 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 Setup Screen
The COMPAT setup screen selects
the type of transmitter used with the
UCR411A. The available modes are:
NA 400 North American - Native 400 Series Digital Hybrid mode
NA 100 Lectrosonics 100 Series compatibility
NA 200 Lectrosonics 200 Series compatibility
NA M3 Compatible with certain non-Lectrosonics transmitters*
NA IFB Compatible with all Lectrosonics IFB transmitters.
NA M6 Compatible with certain non-Lectrosonics transmitters*
NA M7 Compatible with certain non-Lectrosonics transmitters*
EU HBR European Union - Native 400 Series Digital Hybrid mode
EU 100 European Union - 100 Series compatibility
EU 200 European Union - 200 Series compatibility
EU M3 European Union - Compatible with certain
non-Lectrosonics transmitters*
EU IFB European Union - Compatible with all Lectrosonics
IFB transmitters.
EU M6 European Union - Compatible with certain
non-Lectrosonics transmitters*
EU M7 European Union - Compatible with certain
non-Lectrosonics transmitters*
*Contact Lectrosonics for a list of compatible transmitters.
Rio Rancho, NM
13
UCR411A
Frequency Scan Mode
To start the scanning, 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 will shift the display to
the FINE VIEW window which will show an expanded
portion of the spectrum around the cursor.
In the FINE VIEW window, each vertical band represents one frequency the UCR411A is capable of tuning.
The upper right corner shows the transmitter switch
settings for the frequency indicated by the cursor. In
this 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
In addition to assessing the congestion within the RF
tuning range of the receiver, the scanning mode is also
used to find a clear operating frequency. Scroll through
the screen and find a frequency where no RF signals
are present (or in the worst case, only very weak RF
signals). With the cursor on this frequency, simultaneously press the SEL Up, Down and MENU buttons to
leave the scan mode.
14
Scan & VIEW WINDOW Elements
Cursor - shows relative position
of the scanner within the 25Mhz
band of the receiver.
Scan level indications -
showing relative level of RF
activity across the 25MHz
bandwidth of the receiver.
Switch Settings - shows the
transmitter switch settings -
will change rapidly while the
unit is scanning.
Remaining unscanned
part of band.
Fine VIEW WINDOW Elements
Cursor (center bar)
RF Level indicators
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.
Transmitter
Switch Settings
SCROLL reminders
LECTROSONICS, INC.
Antenna Use and Placement
UHF Digital Hybrid Wireless™ Receiver
The receiver is supplied with two straight BNC whip
antennas. In some circumstances remote antennas
may be useful for improving reception. Position remote
antennas at least three or four feet apart and at least
three or four feet from large metal surfaces. If this is not
possible, try to position the antennas so that they are as
far away from the metal surface as is practical. It is also
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.
Note: Be careful about the length of cabling from
antenna to receiver. Long cable runs can have
serious signal loss. Lectrosonics has in-line RF
amplifiers suitable for compensating for long cable
runs. Contact your dealer or the factory for more
information.
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 “dropout.” A dropout 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.
A UHF dropout sounds like a very brief “sshhht” or
a “swishing” sound. Moving the transmitter even a
few inches will change the sound of the dropout, or
eliminate it. A dropout situation may be either better or
worse as a crowd fills or leaves the room, or when the
transmitter or receiver is operated in a different location.
The receiver offers a sophisticated diversity design
which overcomes dropout problems in almost any situation. In the event, however, that you do encounter
a dropout problem, first try moving one of the remote
antennas at least 3 or 4 feet from its original location (or
move the receiver if the antennas are attached directly
to it). This may alleviate the dropout problem at that
location. If dropouts are still a problem, try moving the
antennas to an entirely different location in the room or
moving them closer to the transmitter location.
Lectrosonics transmitters radiate power very efficiently,
and the receivers are very sensitive. This reduces
dropouts to an insignificant level. If, however, you do
encounter dropouts frequently, call the factory or consult
your dealer. There is probably a simple solution.
Rio Rancho, NM
15
UCR411A
Installation and Operating Instructions
1. Install a fresh battery or connect an external power
source to the UCR411A and attach the antennas.
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 Audio Out
XLR jack.
4. Set the Power ON/OFF switch to ON and verify that
the LCD panel activates.
5. Adjust the transmitter gain.
THIS IS PERHAPS THE MOST IMPORTANT STEP
IN THE SET UP PROCEDURE. 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 UCR411A’s audio level icon to
fluctuate fully. This will result in the best possible
signal to noise ratio for the system.
Important:
• Adjustthetransmittergainbefore you adjust the
receiver output level.
• Whenthetransmitteriffullymodulated,itslimiter
will prevent any further increases in level.
• Thereceiveroutputcircuitryissettorunatfull
output, and the level control is simply an attenuator.
There is no difference in signal to noise ratio across
the entire adjustment range of the receiver output
level. The transmitter input gain is the critical adjustment that will affect the signal to noise ratio.
6. Adjust the Audio Output according to the type of
input on your equipment. Use the LEVEL menu
and adjust the level with the SELECT 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 UCR411A
audio output is designed to drive any audio input
device from microphone level to +10dBu line level.
Finding Clear Frequencies
The following procedure will help you identify RF signals in the area and find clear channels for operating
the wireless system.
1. Ensure transmitter is turned off. Turn on the receiver and wait a few seconds until the Main Window
appears on the LCD
2. Ensure the receiver is NOT in PILOT TONE BYPASS mode. (A “P” will be blinking in the upper left
corner of the Main Window.)
Pilot Tone Indicator
TO ENABLE PILOT BYPASS: Step the MENU
key to the MAIN window. Press the MENU and
UP keys together for b bypassed pilot or p normal
pilot.
3. Simultaneously press the MENU and SELECT Up
and Down buttons to enter Scan Mode.
Press all three buttons at the same time and
the receiver will start scanning.
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 dark
areas in the display.
Vertical marker moves left to right
RF activity
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.
16
LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
12
12
5. RF signal strength is indicated by markings in microvolts on the front panel to the left of the LCD.
Pilot
10
1
uV
Div
-40 -20 0 dB
RF AudRxTx
BAT
MENU
ON
OFF
1000
100
SEL
RF level in microvolts
Look for clear channels in the spectrum where
there is no RF activity. Scanning will repeat and
continue until a button is pressed.
No RF activity (clear channel)
6. If necessary, press the MENU button to zoom in for
greater detail for fine adjustment.
Zoom in to make fine adjustments
7. Then press the SEL Up and Down arrows 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.
Locking and Unlocking the
UCR411A Front Panel Controls
The front panel controls can be “LOCKED” to prevent
accidental changes being made during operation and
handling.
To LOCK the UCR411A
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. When in a LOCKED state, the pilot tone
bypass toggle is also defeated.
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 an LCD screen displaying the word “LOCKED.” The unit cannot be used for RF
scanning when it is set in the LOCKED state.
To UNLOCK the UCR411A
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 UCR411A can only be LOCKED or UNLOCKED
from one 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.
Move marker to area with no RF activity
8. Press all three buttons (SEL Up and Down and
MENU) to move to the next screen. Two options will
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.
Press the SEL Up arrow button to select USE OLD
and return to the frequency that was set before
scanning.
Pilot
10
1
uV
Div
-40 -20 0 dB
RF AudRxTx
BAT
MENU
ON
OFF
1000
100
SEL
Use the SEL Up and Down arrow buttons
to select the old or new frequency.
Rio Rancho, NM
17
UCR411A
Replacing the Batteries
Lift and rotate the battery door to open it.
Observe the battery contacts inside the compartment.
The larger contact is the neg. (-) terminal and the
smaller contact is the pos. (+) terminal.
Insert the contact end of the battery first, making sure
the large terminals are aligned with the large contacts in
the compartment.
Depress the batteries slightly to allow the door to rotate
and close. The battery contacts are spring loaded to
maintain constant pressure. The door with snap into
place place when it is fully closed.
CAUTION: Lithium batteries will expand and
swell if allowed to go into a deep discharge.
Be sure to remove lithium batteries as soon
as possible after they are depleted. If lithium
batteries are allowed to fully discharge while
still inside the battery compartment, they will
be very difficult to remove.
Stuck lithium batteries can be avoided by
removing the label wrapping around the
battery before use. This will allow the battery
to swell but will still leave enough room in
the compartment for the battery to fall out
normally.
The larger contacts
are the neg. (–)
terminals.
18
LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
Antenna/Block Reference Table
The A8U whip UHF whip antenna supplied with the receiver is factory cut to a specific frequency block as shown in
the table below. A colored cap and label are used on blocks 21 through 29, and a black cap and label are used on the
other blocks to denote the frequency range of each model.
The chart is useful for fabricating an antenna from coaxial cable or other materials, or for identifying the frequency of
an antenna that is not marked. The lengths shown are specifically for the A8U whip antenna with a BNC connector, as
determined by measurements with a network analyzer. The optimal length of the element in other designs will likely be
different than those shown in this table, but since the bandwidth is typically wider than the specified block, the exact
length is not critical for useful performance in whip, dipole and coaxial designs.
BLOCK FREQUENCY CAP ANTENNA
RANGE COLOR WHIP LENGTH
470 470.100 - 495.600 Black w/ Label 5.47”
19 486.400 - 511.900 Black w/ Label 5.19”
20 512.000 - 537.500 Black w/ Label 4.95”
21 537.600 - 563.100 Brown 4.73”
22 563.200 - 588.700 Red 4.47”
23 588.800 - 614.300 Orange 4.23”
Note: Not all
Lectrosonics
products are
built on all of the
blocks covered
in this chart.
606 606.000 - 631.500 (Use Block 24) 4.00”
24 614.400 - 639.900 Yellow 4.00”
25 640.000 - 665.500 Green 3.80”
26 665.600 - 691.100 Blue 3.61”
27 691.200 - 716.700 Violet (Pink) 3.46”
28 716.800 - 742.300 Grey 3.31”
29 742.400 - 767.900 White 3.18”
30 768.000 - 793.500 Black w/ Label 3.08”
31 793.600 - 819.100 Black w/ Label 2.99”
32 819.200 - 844.700 Black w/ Label 2.92”
33 844.800 - 861.900 Black w/ Label 2.87”
Cut top of colored cap
to make a colored sleeve
Rio Rancho, NM
Whip Length
779
333231
944
29
30
Note: This line should be 6.00" long.
24
25
26
27
28
Frequency Blocks
Colored cap
22
23
21
20
19
470
19
UCR411A
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
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)
• CallingLectrosonicsforassistance
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.
NOTE: Pre-coordinated frequencies do not guard
against interference from outside sources.
When a pre-coordinated group is selected, it is still necessary to check for interference from outside sources.
Groups a, b, c and d each store 8 frequencies. After
selecting one of these groups, step through each frequency one at a time and check for interference before
trying to use the frequency.
To check for interference, set the frequency on the
receiver, then return to the Main Window and observe
the RF level indicator with the matching transmitter
turned OFF.
Pre-coordinated frequencies within each
block are arranged in
four groups (Grp) as
shown at right.
Example: Block 22
The uppermost eight
frequencies comprise
Grp a, the eight just
below them comprise
Grp b, and so on.
Grp a and Grp b are
compatible with one
another.
Grp c and Grp d are
compatible with one
another.
There is no assurance
that the upper 16 (a,b)
are compatible with the
lower 16 (c,d).
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
Grp a
v30
v30
v30
v31
v31
v32
v32
v32
Grp b
v32
v33
v33
v30
v30
v30
v31
v31
Grp c
v31
v31
v31
v32
v32
v32
v32
v32
Grp d
v32
v32
RF Level Indicator
Even a weak signal, as shown here, will have a significant effect on operating range and dropouts. When
interference is present with the transmitter turned off, a
warning message will flash on the screen periodically.
20
LECTROSONICS, INC.
Diagnostics
Multi-channel System Checkout
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. Regardless of how the
frequencies were coordinated, a final checkout procedure is always a good idea.
Scanning with the RF spectrum analyzer built into the
Venue system will identify external RF signals, but
it does not address the compatibility of the selected
frequencies.
The pre-coordinated frequencies on the chart on the
previous pages address in-system intermodulation,
but obviously cannot take into account RF signals from
external sources that may be present in the location
where the system will be operating.
In some cases, you can run the scanner to find clear TV
channels, then find enough pre-coordinated frequencies
in the tuning groups (Grp a through Grp d) to operate
on the clear TV channels. Even so, it is still a good idea
to go through the check out procedure because you
can encounter interference from other wireless, IFB and
intercom systems when you get to the production or
installation site.
1. Set up the system for testing.
Place antennas in the position in which they will be
used and connect to the receivers. Place transmitters about 3 to 5 feet apart, about 25 to 30 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. Set all receivers on clear channels.
Turn on all receivers, but leave the transmitters off.
Observe at the RF signal strength indicator for each
receiver module. If a signal is present, change the
frequency to a clear channel where no signal is
indicated. If a completely clear channel cannot be
found, select the frequency with the lowest RF level
indication. Once all receiver modules are on clear
channels, go to step 3.
3. Turn each transmitter on one at a time.
Start with all transmitters turned off. As you turn on
each one, 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 all channels pass this test, then check
again to see that all channels are still clear as done
in step 2.
UHF Digital Hybrid Wireless™ Receiver
4. Turn each transmitter off one at a time.
With all transmitters and receivers turned on, turn
each transmitter off one at a time, in turn, and look
at the RF level indicator on the matching receiver
module. The RF level should disappear or drop to a
very low level. If it does not, change frequency on
that receiver and transmitter and try it again. When
a clear frequency is found, turn the transmitter on
and move on to the next channel.
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 “multichannel grief.”
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.
Rio Rancho, NM
21
UCR411A
Replacement Parts and Accessories
32251
Velcro mounting strips
CCMINI
Zippered, padded vinyl system pouch
CH12
AC power supply with US type 2-pin plug on hous-
ing, 110 VAC input; 12 VDC, 400 mA output.
VSR1
Thin velcro loop for power cable strain relief.
A8U
UHF marine phosphor bronze antenna - straight
connector, specify block.
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.
UMCWB
Rack-mount multicoupler combining antenna and
power distribution for up to four Lectrosonics wireless microphone receivers.
SNA600
Collapsible dipole antenna adjustable from 550
MHz to 800 MHz. Ideal for situations where a full
360 degree receiving pattern is required as opposed to a directional pattern.
ALP Series (ALP500, ALP620, ALP650)
“Shark fin” Log Periodic Dipole Array (LPDA)
antennas provide useful directional pattern over
500 to 800 MHz range. Ideal for portable applications including temporary setups for field production
ARG15-ARG100
Coaxial cables for remote antennas are available
from Lectrosonics in a variety of lengths - from 2 to
100 ft. Cables include Velcro tie wraps.
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.
VSR1
CH12
PS70
A500RA
21425
.475”
.375” O.D.
21472
22
.375”
.35”
.375” O.D.
LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
Troubleshooting
Symptom Possible Cause
INITIAL POWER ON
LCD display 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. Try a fresh battery.
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 signal is present but it’s far enough
away from the center of the channel that the audio is likely to be
distorted. Try relocating to unused frequencies.
If this doesn’t remove the warning message, the transmitter or
receiver may need repair.
PILOT TONE SQUELCH
Pilot Tone indicator (P) present, but no sound
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 and 200 Series 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.
Rio Rancho, NM
23
UCR411A
Symptom Possible Cause
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 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 UCR411A 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 UCR411A and lowering the
input gain on the device the UCR411A 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 UCR411A is feeding.
Lower the output level of the UCR411A.
Bad frequency response or generally poor audio quality.
Ensure the receiver is set to the compatibility mode that matches
the transmitter in use.
24
LECTROSONICS, INC.
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 - 614.300
Block 606: (Export - Outside N. America) 606.000 - 631.500
Block 24: 614.400 - 639.900
Block 25: 640.000 - 665.500
Block 26: 665.600 - 691.100
Block 27: (Export - Outside N. America) 691.200 - 716.700
Block 28: (Export - Outside N. America) 716.800 - 742.300
Block 29: (Export - Outside N. America) 742.400 - 767.900
Block 30: (Export - Outside N. America) 768.000 - 793.500
Block 31: (Export - Outside N. America) 793.600 - 819.100
Block 32: (Export - Outside N. America) 819.200 - 844.700
Block 33: (Export - Outside N. America) 844.800 - 861.900
* Firmware 5.1 and older has Block 23 split for US restricted access to the 608 to 614 frequencies.
Frequency Adjustment Range: 25.5 MHz in 100kHz steps
Receiver Type: Triple conversion, superheterodyne, 244 MHz,
10.7 MHz and 300 kHz
Frequency Stability: ±0.001 %
Front end bandwidth: ±5.5 MHz @ -3 dB
Sensitivity
20 dB Sinad: 0.9 uV (-108 dBm), A weighted
60 dB Quieting: 1.12 uV (-105 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: 85dB
Third order intercept: +8 dBm
Diversity method: Phased antenna combining SmartDiversity
FM Detector: Digital Pulse Counting Detector operating at
300 kHz
Antenna inputs: Dual BNC female, 50 Ohm impedance
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.
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 and transmitter (9V battery) in 1/10th
volt steps, accuracy +/- 0.2V.
Transmitter (AA battery) x.xxV format, accuracy
+/- 0.05V.
Timer option available when transmitter battery is
set to NiMH.
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
TM
UHF Digital Hybrid Wireless™ Receiver
Phase invert: Audio output phase normal or inverted
SmartNR (noise reduction): OFF, NORMAL, FULL modes
(available in 400 Series mode only)
Audio Performance (overall system):
(These specs apply to 400 Series mode only.)
Frequency Response: 32 Hz to 20 kHz (+/- 1dB)
THD: 0.2% (typical)
SNR at receiver output (dB):
(Note: the dual envelope “soft”
limiter provides exceptionally
good handling of transients
using variable attack and release
time constants. The gradual onset of limiting in the design begins below full
modulation, which reduces the measured figure for SNR without limiting by 4.5 dB)
SmartNR No Limiting w/Limiting
OFF 103.5 108.5
NORMAL 107.0 111.5
FULL 108.5 113.0
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 10 Volts to maximum 18 Volts DC;
1.6 W, 180 mA at 12 VDC
Int Batt: Two 9 Volt alkaline or lithium (165 mA @ 9V,
240 mA @ 6V)
Battery Life:
9V alkaline 6 to 8 hours continuous, up to
12 hours intermittent
9V lithium Up to 20 hours (continuous and intermittent
usage are the same)
Weight: 14 oz. with batteries
Dimensions: 3.23” wide x 1.25” high x 4.64” deep
Specifications subject to change without notice
Rio Rancho, NM
25
UCR411A
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
26
LECTROSONICS, INC.
UHF Digital Hybrid Wireless™ Receiver
Rio Rancho, NM
27
UCR411A
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
2 July 2013
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