Lectrosonics UDR700 User manual

700 Series
INSTRUCTION MANUAL
Encrypted Digital UHF Wireless System
Includes:
UDR700
UM700
UT700
Rio Rancho, NM, USA
www.lectrosonics.com
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UDR700 / UM700 / UT700
Table of Contents
Introduction ............................................................................................................................................................................................5
Overall System Design .........................................................................................................................................................................5
UDR700 Block Diagram ....................................................................................................................................................................5
UDR700 Encrypted Digital Receiver ....................................................................................................................................................5
Rota-Versity™ Reception..................................................................................................................................................................5
RF Section ........................................................................................................................................................................................5
Digital Demodulator ..........................................................................................................................................................................6
Digital Signal Processing ..................................................................................................................................................................6
Audio Output .....................................................................................................................................................................................6
UM700 Block Diagram ..........................................................................................................................................................................6
Encrypted Digital Transmitters ..............................................................................................................................................................6
DSP-Cntrolled Dual Envelope Analog Limiter ...................................................................................................................................6
Digital Signal Processing and Modulation ........................................................................................................................................7
Transmitter RF Output Section..........................................................................................................................................................7
Long Battery Life ...............................................................................................................................................................................7
UT700 Block Diagram ..........................................................................................................................................................................7
Frequency Agility ..............................................................................................................................................................................7
Antenna ............................................................................................................................................................................................7
UT700 Microphone Element .............................................................................................................................................................7
Comparing Diversity Reception and Rota-Versity™ ...........................................................................................................................8
SmartDiversity™ ............................................................................................................................................................................... 8
Rota-Versity™ ................................................................................................................................................................................... 8
The 700 Series Encryption System ......................................................................................................................................................9
Level 1 ..................................................................................................................................................................................................9
Level 2 ..................................................................................................................................................................................................9
Level 3 ..................................................................................................................................................................................................9
UDR700 Controls and Functions ........................................................................................................................................................11
UDR700 Front Panel ..........................................................................................................................................................................11
RF Level Indicator ...........................................................................................................................................................................11
Transmitter Audio Level ................................................................................................................................................................... 11
Information and Status Display ....................................................................................................................................................... 11
Menu Button .................................................................................................................................................................................... 11
Select Up/Down Buttons .................................................................................................................................................................11
Rota-Versity™ Switch ..................................................................................................................................................................... 11
Antenna Phase Combining Indicator ..............................................................................................................................................11
Power Switch ..................................................................................................................................................................................11
Security Jack ..................................................................................................................................................................................11
Audio Monitor Level ........................................................................................................................................................................11
Audio Monitor Jack .........................................................................................................................................................................11
UDR700 Rear Panel ...........................................................................................................................................................................12
AC Power Supply ............................................................................................................................................................................12
EXT Power Connector ....................................................................................................................................................................12
Analog Audio Output Control .......................................................................................................................................................... 12
GND/LIFT Switch ............................................................................................................................................................................12
Phase 0/180 ....................................................................................................................................................................................12
Digital Audio Output - AES-3id ........................................................................................................................................................ 12
Antenna Jacks ................................................................................................................................................................................12
UDR700 Iinformation and Status Display Menus and Functions........................................................................................................12
Power Up Sequence .......................................................................................................................................................................12
Enabling and Disabling the Buttons ................................................................................................................................................12
Menu Interface ....................................................................................................................................................................................13
Main Tuning Menu .............................................................................................................................................................................. 13
TV Tuning Menu ..................................................................................................................................................................................13
Group Tuning Menu ............................................................................................................................................................................ 13
AES Output Menu...............................................................................................................................................................................13
Security Menu ....................................................................................................................................................................................13
Key Generation Menu .........................................................................................................................................................................13
LECTROSONICS, INC.2

Encrypted Digital Wireless System
UM700 Controls and Functions ..........................................................................................................................................................14
Input Jack ........................................................................................................................................................................................... 14
Power On/Off Switch ..........................................................................................................................................................................14
Power LED ..........................................................................................................................................................................................14
Frequency Select Switches ................................................................................................................................................................ 14
Audio Level Control ............................................................................................................................................................................14
Modulation LEDs ................................................................................................................................................................................14
Antenna ..............................................................................................................................................................................................14
Adjustable Low Frequency Roll-Off Control........................................................................................................................................ 15
The Belt Clip ....................................................................................................................................................................................... 15
UM700 Battery Installation .................................................................................................................................................................15
UT700 Controls and Functions ........................................................................................................................................................... 16
Power On/Off Switch ..........................................................................................................................................................................16
Power LED ..........................................................................................................................................................................................16
Hiding the Power LED ........................................................................................................................................................................16
Encryption Key Link ............................................................................................................................................................................ 16
Frequency Select Switches ................................................................................................................................................................ 16
Modulation LEDs ................................................................................................................................................................................17
Audio Level Control ............................................................................................................................................................................17
Locked Mode ......................................................................................................................................................................................17
UT700 Battery Installation ..................................................................................................................................................................17
System Installation and Operating Instructions ...............................................................................................................................19
System Setup ..................................................................................................................................................................................... 19
Changing the Security Level ...............................................................................................................................................................22
Setting the Encryption Key .................................................................................................................................................................22
Protecting the Encryption Key ............................................................................................................................................................23
UT700 Vari-Mic™ Controls ................................................................................................................................................................. 23
Bass / Mid / Treble (LO / MID / HI) ..................................................................................................................................................23
Preamp Level Control .........................................................................................................................................................................24
Bass Filter ..........................................................................................................................................................................................24
5-Pin Input Jack Wiring (UM700) ........................................................................................................................................................24
RF Bypassing (UM700) ......................................................................................................................................................................25
Line Level Signals (UM700) ...............................................................................................................................................................25
Encryption Key Cables .......................................................................................................................................................................25
Troubleshooting ...................................................................................................................................................................................27
Power Problems .................................................................................................................................................................................27
UDR700 ..........................................................................................................................................................................................27
UM700 ............................................................................................................................................................................................27
UT700 .............................................................................................................................................................................................27
RF Problems ....................................................................................................................................................................................... 27
Audio Problems ..................................................................................................................................................................................28
Specifications .......................................................................................................................................................................................30
Overall System ................................................................................................................................................................................30
UDR700 Digital Receiver ................................................................................................................................................................30
UM700 Digital Transmitter ...............................................................................................................................................................30
UT700 Digital Transmitter ................................................................................................................................................................30
Replacement Parts and Accessories ................................................................................................................................................. 32
Service and Repair ...............................................................................................................................................................................33
Returning Units for Repair ..................................................................................................................................................................33
Microphone Cord Termination ............................................................................................................................................................34
Rio Rancho, NM 3

UDR700 / UM700 / UT700
LECTROSONICS, INC.4

Encrypted Digital Wireless System
Introduction
The 700 Series encrypted digital wireless microphone
system uses a digital audio chain and an encrypted
digital RF communications link for excellent sound
quality and data security. The applications for this
system include high-end motion picture, studio and
stage, and boardrooms, courtrooms and conference
rooms where security is a concern. While these
applications are very different from one another, this
single system is able to provide significant benefits in all
of these areas of operation.
Overall System Design
The 700 Series system uses state-of-the-art techniques
to offer superb audio quality and formidable security.
Audio is sampled at 44.1 kHz using a 24-bit A/D con-
verter in the transmitter. (For perspective, a CD uses
the same sample rate, but only 16 bits per sample.)
High-entropy encoding, cryptographically secure
encryption, efficient modulation/demodulation,
decryption and decoding all take place in the digital
domain, using highly optimized proprietary techniques.
If digital audio output is desired, there is no need to
convert back to analog at all; otherwise, the first and
only conversion back to analog occurs at the receiver’s
output.
In the transmitter, the audio first passes through a DSP-
controlled, dual-envelope analog limiter to prevent
distortion from occurring on high level peaks. The audio
is then digitized and fed to a DSP. The DSP uses a
proprietary audio encoding scheme to lower the bit rate
and provide the high entropy required for secure
encryption. The bit stream is then encrypted, appor-
tioned into packets, and sent over the air using a
proprietary digital modulation technique.
In the receiver, the digital baseband signal is demodu-
lated to recover the original bit clock and data stream.
UDR700 Block Diagram
The DSP separates out the packet headers and de-
crypts the audio data. The audio data is then decoded
to recover the original audio signal present in the
transmitter.
UDR700 Encrypted Digital Receiver
Rota-Versity™Reception
The UDR700 receiver uses a proprietary technique to
implement a unique and very effective type of diversity
reception called Rota-VersityTM.
Rota-versity is a microprocessor controlled antenna
phase matching technique. The UDR700 uses a four
way phase shifter to combine the power of the two
antennas in any of four phase angles, 90 degrees apart.
Hundreds of times per second, all of the four phase
angles are tried. The angle offering the best reception
is always used for the audio data. The result is that the
diversity system “tracks” the phase shifts between the
two antennas, keeping phase cancellation loss under 1
dB at all times. Multi-path dropouts are minimized and
operating range is maximized by using both antennas,
in phase, at all times.
RF Section
The RF section of the UDR700 is a traditional dual-
conversion superheterodyne receiver. Once the
antenna power is combined, the RF signal is passed
through dual tracking filters. These 7 MHz bandpass
filters are centered on the operating frequency as it is
tuned through the 25.6 MHz frequency block for excel-
lent selectivity and interference rejection. The first
tracking filter is followed by a GaAs FET attenuator that
applies from 2 to 32 dB of attenuation to provide very
high overload protection. The amount of attenuation is
controlled by the RSSI (Received Signal Strength
Indicator) feedback from the second IF.
Input
Bandpass
Filter
RF
Amp
4-Way
Phase
Combiner
0/90/180/270
Antenna
Kill Switch
A/B/Rot.
Input
Bandpass
Filter
RF
Amp
1st
Mixer
Dual
SAW
Filters
2nd
Mixer
Quadrature
Detector
1st
Local
Oscillator
2nd
Local
Oscillator
244
MHz
10.7
MHz
Input
Bandpass
Filter
Display
& Buttons
Microprocessor
Microprocessor
Digital
Demodulator
Digital Signal
Processor
Decode Decrypt
D/A
Converter
Anti-aliasing
Filter
Audio
Amp
Tracking
Filter
FET
Attenuator
X
LR
Out
Headphone
Out
Phase
Reverse
Attenuator
Switch
2
3
1
600
Tracking
Filter
RF
Amp
Integrated Circuit
RSSI
RSSI
AES3
Transmitter
AES-3id
Jack
Rio Rancho, NM 5

UDR700 / UM700 / UT700
The 244 MHz from the first IF is reduced to the second
IF of 10.7 MHz, and is then fed to the Quadrature
Detector. The first mixer is a GaAs MMIC device with a
rated IP3 (third order intercept) of +24 dBm to minimize
undesired IM products. Because the signal is digital,
thermal drift in the detector has little effect on the
signal’s content, unlike an analog receiver.
Digital Demodulator
The digital demodulator consists of a PLL clock recov-
ery circuit and a bit slicer. The recovered bit clock and
data stream are fed to the DSP. In addition, the recov-
ered bit clock is used to derive the timings for the
receiver’s digital audio circuits, so the receiver audio is
synchronous with the transmitter audio, sample for
sample.
Digital Signal Processing
The DSP uses the packet headers as a timing refer-
ence to recover the digital audio data. The data is then
decrypted and decoded to recover the original digitized
audio samples. Additionally, the packet headers also
contain transmitter battery status information, which is
extracted by the DSP.
Audio Output
The digital audio samples are sent to the AES-3id
transmitter for digital audio output, and to the D/A
converter for conversion to analog. The converter
output is filtered and amplified, and then fed to a
transformer, attenuator and XLR jack. The analog
output is also sent to a separate headphone amplifier
on the UCR700 front panel for monitoring purposes.
The signal at the headphone output is taken just ahead
of the output transformer, so it provides the same audio
quality as the XLR output and can also be used as a
second output or recorder feed.
UM700 Block Diagram
The main audio output amplifier is set for maximum
gain. This output passes through a passive attenuator
and phase switch on its way to the rear panel Audio
Output XLR jack. The passive attenuator reduces the
audio level in calibrated 5 dB steps, ensuring the signal-
to-noise ratio of the receiver remains the same at all
output levels selected by the rear panel control.
Encrypted Digital Transmitters
Two encrypted digital transmitters are offered, a belt
pack unit and a hand held unit. Although their physical
packages differ, internally, they are essentially the
same. The major difference is the microphone input
jack in the UM700 and the VariMic™used in the UT700
hand held transmitter.
The microphone input jack used in the UM700 is
configured so that virtually every lavaliere, hand-held or
shotgun mic can be used, regardless of whether they
use positive or negative bias. (See UM700 Controls
and Functions and 5-Pin Input Jack Wiring.)
The UT700 uses a built in microphone element. (See
UT700 Microphone Element.)
DSP-Cntrolled Dual Envelope Analog Limiter
In order to make the best use of the high quality A/D
converter, microphone audio is limited in the analog
domain first, before being sampled. The DSP controls
this process, but because the limiting is done in the
analog domain, levels near the converter’s maximum
may be used without fear of clipping. (The limiter has a
range of more than 30 dB for excellent overload protec-
tion.)
The limiter has a fast attack, but different release
characteristics, depending on the nature of the signal
that drove the input into limiting. Brief transients result
in a fast decay, to avoid “pumping” effects, while sus-
tained loud signals result in a slower decay, to keep
distortion to a minimum. The result is a transparent-
sounding limiter with excellent low distortion character-
istics.
Phase
Locked
Loop
Freq
Switches
11001001
A-D
Converter
Digital Signal Processor
Shunt
Limiter
Bicolor
Modulation
LEDs
Microprocessor
9V
Battery
Switching
Power
Supply
+3.3v
+1.8v
+9v
-3v
50
Isolator
Hi/Lo
Pass
Filter
Audio
Bicolor
Power
LED
Audio
Level
Input
Amp
LF
Rolloff
Digital
Modulator
RF
Amp
5
4
3
2
1
+3.3V Bias
Supply
Mic
Jack
Dual
Envelope
Limiter
Encode Encrypt
Voltage
Controlled
Oscillator
Encryption
Key Link
LECTROSONICS, INC.6

Encrypted Digital Wireless System
Digital Signal Processing and Modulation
The preamplified and limited audio signal is converted
to digital using a 24-bit A/D converter and fed to the
DSP. Within the DSP, the audio is encoded to reduce
the bit rate and increase entropy in the data stream
prior to encryption. The data stream is then encrypted
and apportioned into packets, delimited by packet
headers. The complete bit stream is modulated onto
the carrier using a modified pi/4 DQPSK (differential
quadrature phase shift keying) method. This modula-
tion method makes efficient use of the RF spectrum
and is easy to demodulate reliably.
Transmitter RF Output Section
Intermodulation (IM) is a problem that occurs in the final
amplifier stages of conventional transmitters when the
transmitters are within a few feet of each other. This
can create serious problems in multichannel wireless
systems when an IM signal falls in the same range as
the carriers, IF frequencies, local oscillator or image
frequencies of the systems being operated. The
UM700 and UT700 eliminate this problem by passing
the modulated radio signal through a circular isolator
before it enters the antenna. The circular isolator
functions like a “one-way check valve,” allowing the RF
signal to pass through to the antenna, but not allowing
spurious RF to pass back into the transmitter amplifier
stage. This provides excellent stability and eliminates
IM in the output stage of the transmitter.
Long Battery Life
The use of highly efficient circuits and switching power
supplies throughout the design allow over 4 hours of
operation using a single 9 volt alkaline battery. (A 9 V
lithium battery will provide over 7.5 hours of operation.)
The battery compartment is a unique mechanical
design which automatically adjusts to fit any brand of 9
volt battery, and the battery contacts are spring loaded
to prevent “rattle” as the unit is handled.
UT700 Block Diagram
Mic
Frequency Agility
700 Series wireless systems are currently available in
four different “blocks” of 256 frequencies each, from
562.200 to 665.500 MHz.
Note: Frequencies between 608.000 MHz to
614.000 MHz are reserved and not available for
commercial use.
Each of these blocks is preset at the factory and
provides 256 selectable frequencies in 100 kHz steps
over a 25.6 MHz bandwidth. This wide variety of
selectable frequencies alleviates carrier interference
problems in mobile or traveling applications. Two 16-
position rotary switches are used to select the fre-
quency.
The transmitter section uses a synthesized, frequency
selectable main oscillator. The frequency is extremely
stable over a wide temperature range and over time.
Antenna
At UHF, where wavelengths and antennas are shorter
than at VHF, a resonant length wire is preferred over
using the microphone cable as the antenna. The
antenna on the UM700 is a flexible 1/4 wavelength
insulated galvanized steel cable, detachable via an
SMA connector. The impedance of this connector is 50
Ohms.
The UT700 has a dipole antenna incorporated into the
circuit board.
UT700 Microphone Element
The UT700 includes the Lectrosonics VariMicTM mic
element. The VariMicTM is a cardioid condenser (back
electret) microphone that is adapted for the unique
circumstances of wireless microphones. It offers
excellent dynamic range while minimizing handling
noise and low frequency noise (rumble or wind).
In the VariMicTM, an unusual pumped source FET circuit
increases the usable dynamic range 12 dB and greatly
reduces distortion, just as if the FET were being
Phase
Locked
Loop
Freq
Switches
11001001
A-D
Converter
Digital Signal Processor
Shunt
Limiter
Bicolor
Modulation
LEDs
Microprocessor
9V
Battery
Switching
Power
Supply
+3.3v
+1.8v
+9v
-3v
50
Isolator
Audio
Bicolor
Power
LED
Audio
Level
Input
Amp
LF
Rolloff
Digital
Modulator
RF
Amp
Dual
Envelope
Limiter
Encode Encrypt
Voltage
Controlled
Oscillator
Encryption
Key Link
Preamp
Element
Preamp
Level
Tone
Rio Rancho, NM 7

UDR700 / UM700 / UT700
supplied with 48 Volts. A unique 16-position sensitivity
control at the element itself can also adjust the sensitiv-
ity over a 15 dB range. This is in addition to the normal
gain control in the wireless microphone. The result is
the widest dynamic range of any condenser mic in a
wireless microphone.
The VariMicTM has a three-point damped rubber suspen-
sion to reduce high frequency handling noise and a
generous sized windscreen to keep wind noise and
breath pops away from the microphone.
Comparing Diversity Reception and Rota-Versity™
The UDR700’s new approach to diversity reception is a
vast improvement over traditional designs. Traditional
analog diversity reception designs employed techniques
ranging from simple antenna and audio signal switching
using one or two receivers, to dual-receiver ratio
combining systems. In the digital realm, even more
advanced techniques are possible to analyze and
correct antenna phase.
A popular phrase, “true diversity,” arose in defense of
dual-receiver audio switching diversity designs versus
very low cost receivers that simply had two antennas
mounted on a single unit. Diversity reception can be
implemented by mixing or selecting the audio from two
separate receivers, or by various antenna combining
techniques ahead of the receiver. In reality, all receiver
designs can aptly be called “true diversity” if they make
use of two or more antennas that are receiving diverse
(uncorrelated) signals.
Two diversity designs found in use today include Audio
Switching Diversity and Ratio Diversity. Both offer some
improvement in
audio reception,
but with a
significant
increase in
equipment costs
because of the
need for two
receivers.
SmartDiversity™
from
Lectrosonics is
different.
SmartDiversity™
SmartDiversity™is a microprocessor controlled tech-
nique that automatically analyzes audio content and RF
levels to determine optimum timing for the switching
activity. Active analog antenna phase switching tech-
niques use both antennas at the same time, with 180
degree phase switching to help keep the received
signals in phase and minimize dropouts. When the
overall RF signal strength quickly drops, the phase of
one antenna is switched 180 degrees. If the switch
increases the RF
level, it will remain
latched in that
position until the
RF level quickly
drops again. Both
antennas are used
at the same time,
so overall operating
range is also
improved.
Rota-Versity™
ANTENNA PHASE
SWITCHING
RECEIVER
180 DEGREE PHASE
SWITCHING
MICROPROCESSOR
RECEIVER A
RECEIVER A
SWITCH
RECEIVER AUDIO OUTPUT
SELECTED BY RF LEVEL
AUDIO SWITCHING
DIVERSITY
AUDIO
OUTPUT
RATIO DIVERSITY
AUDIO COMBINING
AUDIO
OUTPUT
Rota-Versity™is only possible in the digital realm. Rota-
VersityTM uses a four-way phase shifter to combine the
output of two antennas in any of four phase angles,
each 90 degrees apart, regardless of RF levels. Hun-
dreds of times per second, all of the phase angles are
explored, with the angle offering the best reception
used for the audio data. The result is the diversity
system “tracks” the phase shift between the two anten-
nas to ensure that they always add to one another (they
are always less than 90 degrees out of phase). Multi-
path dropouts are minimized and operating range is
maximized by using both antennas simultaneously.
Because it times
phase switches
to happen only
during digital
packet headers
where no audio
is being con-
veyed, Rota-
versity™is also
transparent and
cost effective .
ROTA-VERSITY™ DIGITAL
PHASE CORRELATION
0
270 90
MICROPROCESSOR
RECEIVER
180
PHASE CORRECTED
COMBINING
LECTROSONICS, INC.
RECEIVER A
RECEIVER A
RECEIVER AUDIO OUTPUTS
MIXED IN OptiBlend™ RATIO
CONTROLLED BY RF LEVEL
AUDIO
PANNING
CIRCUIT
8

Encrypted Digital Wireless System
The 700 Series Encryption System
To guard against eavesdropping, the encryption in the 700
Series digital wireless system makes use of several
processes and a unique key setup procedure to provide a
high level of entropy and thus maximum security. A 128-
bit key is used to create a formidable barrier against brute
force attacks attempting to break the encryption code.
The result is 340 trillion, trillion, trillion possible key
combinations.
The audio signal entering the transmitter first passes
through a DSP controlled, dual-envelope limiter that cleanly
limit signal peaks up to 30 dB above full modulation. The
signal is then converted to 24-bit digital audio, with sampling
at 44.1 kHz. The resulting bit stream is then digitally
compressed to meet the bandwidth requirements for the
radio output, encrypted and then transmitted over the air.
The encryption key setup procedure involves a cable
connection between the transmitter and receiver. Once
connected, the receiver maybe placed into the key
generation mode and the operator is prompted to make
several button pushes on the front panel of the receiver.
These button pushes capture the instanteneous value of a
fast, free running, 16-bit timer. The captured values are
combined to create the eight, 16-bit segments of the 128-
bit encryption key.
With the exception of Security Level 3, any number of
transmitters can be connected during a single setup
procedure to share a common encryption key. Regardless
of which Security Level is selected, only one receiver can
share the key with the transmitter(s). This prevents the
use of a second receiver to eavesdrop on the transmitted
signal.
The 700 System offers three levels of security, trading off
ease of use for immunity to attack.
Level 1
Security Level 1 offers the most intuitive operation. Once
the key has been set, the equipment may be operated
exactly the same as a traditional analog system. The
transmitter and receiver may be powered on in any
sequence, and the transmitter may move in and out of
range without consequence (except normal squelching).
Security in this mode is excellent, but the scrambling
sequence repeats approximately every 20,000 bits,
theoretically exposing the user to differential attacks. Due
to its ease of use and quite effective security, Level 1 is the
default security level.
Level 2
Security Level 2 offers much greater encryption strength,
at the cost of slightly less intuitive operation. In Level 2,
the scrambling sequence never repeats (i.e. the PRNG is
free-running), so the receiver must be on and ready to
receive when the transmitter is first switched on. Some
signal loss is tolerated but if the transmitter should wander
out of range for more than ten seconds, it will be neces-
sary to switch it off and on again to restart the sequence,
resynchronizing with the receiver. Security in this mode is
a great deal stronger than Level 1, since the scrambling
sequence never repeats. Only if the sequence is deliber-
ately reused (i.e. by cycling transmitter power after
prolonged signal loss, or by reusing the same key session
after session) is a differential attack possible even in
theory.
Level 3
Security Level 3 offers the strongest encryption of all,
again at the cost of some convenience. Level 3 is much
like Level 2, except that the equipment itself enforces a
policy that
no portion of any scrambling sequence shall
ever be used more than once
. This is a fundamental tenet
of cryptography: key reuse leads to vulnerability. Thus,
Level 3 security is about as close to the holy grail of the
one-time pad as any wireless vendor is likely to offer at a
reasonable price. Operation is a little different in Level 3:
1. The transmitter will not send any audio until a new key
is transferred from the receiver.
2. Only one transmitter may receive each key.
3. If the transmitter is out of range of the receiver for more
than ten seconds, it will be necessary to generate a
new key in order to continue using the system.
All three levels offer strong encryption, so each user may
make a policy decision based on an assessment of risk.
Those requiring ease of use may relax, knowing that
eavesdropping is extremely difficult even in Level 1. Many
users may find Level 2 to be just as convenient, allowing
them to use greater encryption strength. Those users
willing to follow stricter security procedures can use Level
3, the strongest encryption available today from a wireless
microphone.
ENCRYPTION KEY CREATION PROCESSOR FROM RECEIVER
RANDOM
BUTTON
PRESSES
AUDIO
INPUT
24-BIT
A/D CONVERTER
HIGH ENTROPY
ENCODER
(DIGITAL COMPRESSION)
ENCRYPTER
ENTROPY
HARVESTER PRNG
128-BIT KEY
(SEED)
BIT STREAM BIT STREAM
BIT STREAM
(SCRAMBLING SEQUENCE)
MODULATOR OUTPUT SECTION
ANTENNA
DIGITAL TRANSMITTER HARDWARE
Rio Rancho, NM 9

UDR700 / UM700 / UT700
LECTROSONICS, INC.10

Encrypted Digital Wireless System
UDR700 Controls and Functions
UDR700 Front Panel
Information and Status Display SELECT Up/Down Buttons POWER On/Off Switch
RF Level Indicator
MENU Button
Antenna Phase Combining Indicator
Audio Monitor Jack SECURITY Jack
Transmitter Audio Level ROTA-VERSITY Switch Audio Monitor Level Control
RF Level Indicator
A 10-segment LED strip indicates the level of the
incoming RF signal. The strip is calibrated to provide
accurate indications from 1 uV to 1 mV. The LEDs are
highly visible from a distance.
Note: A digital wireless receiver behaves differently
than an analog receiver during weak RF signal
conditions. The audio signal to noise ratio of an
analog receiver will gradually deteriorate as the RF
signal level drops, and the receiver will continue to
produce audio (accompanied by some noise) even
at very low RF levels. The signal to noise ratio of a
digital receiver remains largely unchanged as the
RF signal level drops, until suddenly, over a range
of just a few dB, the signal abruptly degrades and
then is muted altogether.
The RF Level Indicator can accurately display signals
as low as 1 uV to permit checking for interfering signals
just below the squelch threshold of the receiver. With
the transmitter turned off, the LEDs will indicate the
presence of interference.
Transmitter Audio Level
The 10-segment Transmitter Audio Level indicator strip
displays the modulation (audio level) of the incoming
signal. The strip is calibrated in 6 dB steps over an
expanded scale (54 dB) providing an extremely accu-
rate visual “picture” of the signal dynamics.
Information and Status Display
A 16-segment Information and Status Display provides
information about the security level, selected frequency,
or tuning group, transmitter Frequency Select Switch
setting, TV channel, transmitter battery level and
system locked/unlocked status.
Menu Button
The MENU button steps the Information and Status
Display through six different displays used for setup and
operation. (See Information and Status Display Menus
and Functions and Installation and Operating Instructions.)
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.
Rota-Versity™ Switch
The Rota-Versity™ switch is a three-position switch
used to either enable diversity operation, or to tempo-
rarily disable diversity operation (by selecting antenna A
or antenna B) for diagnostic purposes.
Antenna Phase Combining Indicator
Indicates the phase relationship between antenna A
and right for antenna B. Also provides a visual warning
if the Rota-Versity switch is not in the normal (centered)
position, or if one of the antennas is malfunctioning.
Power Switch
The Power switch applies AC or External DC power to
the unit. This switch, in conjunction with the MENU
button, can also be used to lock, or unlock the front
panel buttons (see Disabling Front Panel Buttons), and
in conjunction with the SELECT Down button, can used
to set the Security Level. (See Installation and Operat-
ing Instructions, Setting the Security Level.)
Security Jack
The Security Jack is a 3.5 mm mono connector used to
set the security level of the associated transmitter(s).
(See Installation and Operation Instructions, Setting the
Security Level.)
Audio Monitor Level
The Audio Monitor Level controls the amplitude of the
audio output from the Audio Monitor Jack.
Audio Monitor Jack
The 1/4-inch, stereo, Audio Monitor Jack will drive a
wide variety of different types of headphones and can
also be used as a second high quality audio output to
drive recorders or other external audio devices.
Rio Rancho, NM 11

UDR700 / UM700 / UT700
UDR700 Rear Panel
AC Power EXT Power
Input Connector Connector GND LIFT Digital Audio AES-3id
AUDIO OUTPUT Jack Analog Audio ANT B ANT A
PHASE Switch Output Control
AC Power Supply
The UDR700 has a universal switching power supply
which operates on AC voltages ranging from 95 to 240
Volts, 50 or 60 Hz. Since the power supply is self
protected against line transients, short circuits, and over
current conditions, there is no external fuse.
EXT Power Connector
This 4-pin XLR jack is also provided for connecting to
an external power source (+11 to +17 VDC) if desired.
The EXT POWER Connector accepts a standard 4-pin
female XLR connector wire so that Pin 4 is positive and
Pin 1 is ground.
Analog Audio Output Control
A calibrated control on the rear panel adjusts the output
level in 5 dB increments, calibrated in dBu. This control
adjusts the absolute output level at the rear panel XLR
connector when the transmitter is fully modulated
(maximum audio level). The Analog Audio Output
Control is located after the output transformer allowing
the signal to noise ratio to remain constant regardless
of the control’s setting.
GND/LIFT Switch
The GND/LIFT switch either applies or removes chassis
ground from Pin 1 of the AUDIO OUTPUT jack. Lifting
the chassis ground is useful when AC hum is generated
by a ground loop.
Note: Ground loops can occur when the analog
audio output is connected to remote equipment
powered from a different AC main supply.
Phase 0/180
The PHASE 0/180 switch reverses the polarity of the
analog audio output signal.
Digital Audio Output - AES-3id
A BNC connector providing a digital audio output signal
conforming to the AES-3id standard.
Antenna Jacks
These are standard 50 Ohm BNC terminals for the RF
input to the receiver. Both antennas are required for
diversity mode (normal) operation.
UDR700 Iinformation and Status Display
Menus and Functions
Power Up Sequence
When the UDR700 is powered up, the Information and
Status Display will display three messages in sequence
followed by one of the three tuning menus (Main Tuning
Menu, TV Tuning Menu or Group Tuning Menu).
Buttons Enabled/Disabled
Security Level
Firmware Version/Decoder Firmware Version
SECURITY LEVEL 1
BUTTONS ENABLED
UDR700 V3.0/3.0
The tuning menu displayed is the last tuning menu
displayed prior to the last time the UDR700 was turned off.
Enabling and Disabling the Buttons
The front panel control buttons (MENU, SELECT Up/
Down) can be disabled (locked) to prevent accidental
operational changes during use.
When the UDR700 is turned on, the first message
displayed on the Information and Status Display will be
either BUTTONS ENABLED or BUTTONS DISABLED.
If buttons are disabled, pressing any button causes the
message BUTTONS DISABLED to be displayed briefly
and no action will be taken.
LECTROSONICS, INC.12

Encrypted Digital Wireless System
To toggle between BUTTONS ENABLED and BUT-
TONS DISABLED, press and hold the SELECT Up
button while setting the POWER switch to On.
Menu Interface
The menu interface consists of six linked menus:
Main Tuning
TV Tuning
Group Tuning
AES Output
Security
Key Generation
The MENU Button is used to cycle through the menus.
The menus are:
Main Tuning Menu
The Main Tuning menu is normally the first screen that
appears on the Information and Status Display after the
power up sequence is complete. This screen shows the
frequency (in MHz) that the UDR700 is tuned to, the
transmitter battery voltage (if actively receiving this
information from the transmitter) and the Frequency
Select Switch settings for the transmitter.
6 68 .
1 0 0 8. 7V 19
If the transmitter battery is low, the voltage display will
blink. If the transmitter battery is very low, a “Battery
Low” warning message will flash periodically, regardless
of what menu is currently being displayed.
The UDR700 comes preloaded with three groups of
seven selected intermod-free frequencies. In the Main
Tuning menu, the SELECT Up and Down buttons can
be used to navigate among the seven frequencies in
the current group. (See Group Tuning Menu.)
You can also tune the receiver across the 25.5 MHz
block in 100 kHz increments by pressing the SELECT
Up or Down button while pressing and holding the
MENU button. Holding either SELECT button down
activates an autorepeat function for faster tuning.
If pressing any button results in “BUTTONS DISABLED”
being displayed, the front panel buttons have been
disabled. (See ENABLING AND DISABLING THE
BUTTONS.)
TV Tuning Menu
The TV Tuning menu is just like the Main Tuning menu,
except that the applicable UHF TV channel number is
shown in the center of the display in place of the
transmitter battery voltage. This makes it easier to
avoid occupied UHF TV channels in the geographical
area of operation.
9147TV001.866
Group Tuning Menu
The Group Tuning menu displays the current group (the
three groups are designated A, B, and C) and the
selected frequency within that group. The Transmitter
Frequency Select Switch settings are shown at right, as
on the other tuning menus.
G R PA C
H AN 1 20
In the Group Tuning menu, the SELECT Up and Down
buttons navigate among the seven frequencies in the
current group. To choose a different group, press either
SELECT Up or Down while holding down the MENU
button.
Note: If one of the tuning menus is active when
the receiver is powered down, the receiver will
return to that same menu following the three boot
messages the next time it is turned on.
AES Output Menu
The AES Output menu allows toggling the DIGITAL
AUDIO OUTPUT (AES-3id jack at the receiver’s back
panel) on or off. Use the SELECT Up and Down
buttons to change the setting.
Caution: To minimize the chance that the digital
audio output signal will radiate unwanted RF
energy, this function should be turned off
unless the digital audio output is in use.
Security Menu
The Security menu displays the current security level.
(See The 700 Series Encryption System.)
L 1 E
SCRI
T N
O
Y
U
This menu also allows decryption in the receiver to be
temporarily turned off. Use the SELECT Up and Down
buttons to toggle between decryption on and off. If the
UDR700 is turned off with decryption disabled,
decryption will automatically be enabled when the unit
is powered up again.
Note: The only reason to turn decryption off is to
hear what the received audio sounds like without
the right decryption key. 700 Series transmitters
are incapable of transmitting an unencrypted
signal.
Key Generation Menu
The Key Generation menu is the entry to the security
key generation process.
M A E NE
W YE
K
K ?
Press SELECT Up to begin the new key generation
process. (See SETTING THE ENCRYPTION KEY.)
Rio Rancho, NM 13

UDR700 / UM700 / UT700
UM700 Controls and Functions
Input Jack
LECTROSONICS
UM700
OFF ON
AUDIO
LEVEL
–10
–20
ANTENNA
Font Panel
Power LED
Power ON/OFF Switch
Audio Level Control
Modulation LEDs
SMA Antenna Jack
Input Jack
The input jack on the UM700 is a Switchcraft TA5M
connector that accommodates virtually every lavaliere,
hand-held or shotgun microphone available, regardless
of whether they use positive or negative bias. Use a
Switchcraft TA5F connector on the microphone cable or
input adapter cord. The input circuits will also cleanly
handle line level signals up to 300 mV before limiting
(higher with special wiring). (See 5-Pin Input Jack
Wiring, Line Level Signals (UM700).)
Power On/Off Switch
The Power On/Off Switch turns the battery power on
and off. Digital muting prevents “thumps” or transients
from occurring in the event that the switch is turned off
or on abruptly.
Power LED
The Power LED glows green when the battery is good
and the ON/OFF switch is set to ON. The LED glows
yellow/orange as the battery voltage drops and finally
glows red when there are about 30 minutes of operation
left (with an alkaline battery). The lamp will blink red
when there are only a few minutes of battery life left.
Caution: A NiMH battery will give little or no
warning when it is depleted. If you wish to use
NiMH batteries in the UM700, we recommend
trying fully charged batteries in the unit, noting
the length of time that the batteries will run the
unit and in the future use somewhat less than
that time to determine when the battery needs
to be replaced.
A weak battery will sometimes cause the Power LED to
glow green immediately after the unit is powered up, but
will soon discharge to the point where the LED will go
red, flicker red or shut off completely (much like a
flashlight with “dead” batteries). If the lamp fails to light,
the battery should be replaced.
Frequency Select Switches Left Panel
FREQUENCY
1.6MHz 100kHz
0 1 2
3
4
5
6
7
8
9
A
B
C
D
E F
0 1 2
3
4
5
6
7
8
9
A
B
C
D
E F
Belt Clip
SN:
XXXX
FCCID:DBZUM700
Lectrosonics, Inc.
Made in U.S.A.
35 150
75 Hz
LF ROLL OFF
Right Panel
Low Frequency Roll-Off Control
Frequency Select Switches
These two 16-position rotary switches (located under a
sliding door on the transmitter’s left side) adjust the
center frequency of the carrier. The 1.6 MHz switch is
the coarse adjustment and the 100 kHz switch is the
fine adjustment.
Audio Level Control
The front panel Audio Level Control is used to adjust
the incoming audio input level for proper modulation.
Modulation LEDs
The Modulation LEDs provide a visual indication of the
input audio signal level from the microphone and
feedback as the transmitter is turned about the selected
security level.
These two bicolor LEDs can glow either red or green to
indicate modulation levels.
Signal Level -20 LED -10 LED
Less than -20 dB Off Off
-20 dB to -10 dB Green Off
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 db Red Red
When the transmitter is first switched on, the modula-
tion LEDs blink a code that indicates the current
security level:
Level 1 Security one blink
Level 2 Security two blinks
Level 3 Security three blinks
Antenna LECTROSONICS, INC.14

SN:
XXXX
FCCID:DBZUM700
Lectrosonics Inc.
Made in U S.A.
35 150
75 Hz
LF ROLL OFF
SN:
XXXX
FCCID:DBZUM700
Lectrosonics, Inc.
Made in U S A.
35 150
75 Hz
LF ROLL OFF
Encrypted Digital Wireless System
The insulated flexible galvanized steel cable antenna
supplied with the transmitter is cut to 1/4 wavelength of
the center of the frequency block (the frequency range)
of the transmitter. It is removable via an SMA connec-
tor. The SMA connector is a 50 Ohm RF port which can
also be connected directly to test equipment. Replace-
ment antennas are available in pre-cut lengths for
specific frequency blocks, or as a kit with instructions to
cut the antenna for any frequency block. Replacement
antenna is part AMM(xx) where “xx” indicates the
frequency block, i.e.. AMM27 for block 27. (See Acces-
sories Master Catalog, or visit www.lectrosonics.com.)
Adjustable Low Frequency Roll-Off Control
An 18 dB per octave Low Frequency Roll-off Control is
provided in the audio section, with the -3 dB point
adjustable from 35 Hz to 150 Hz. The actual roll-off
frequency will vary according to the low frequency
response of the mic capsule being used.
. .
Low Frequency Roll-off Adjustment
The low frequency roll-off control is used to reduce the
undesirable effects of very low frequency audio, such as
those produced by air conditioning systems, automobile
traffic and other sources. Excessive low frequency
content in the audio input can cause overload of the
program audio in recording applications. In sound
reinforcement systems, excessive low frequency
content can cause excessive power amplifier drain or
even damage to loudspeaker systems. A common
example is wind blowing across a microphone, causing
very high levels of low frequency audio (wind noise). By
rotating the roll-off control clockwise, the hinge point of
the roll-off is increased to reduce the level of low
frequencies. In low noise situations, such as a motion
picture production set indoors where environmental
noise is minimal, the control can be rotated counter-
clockwise to permit low frequency audio to be captured.
The Belt Clip
The belt clip may be removed for special applications by
removing the Belt Clip Attachement Screw.
WARNING: USE ONLY THE SCREW THAT IS
SUPPLIED.
The circuitry is tightly packed into this unit. A longer
screw will permanently damage the transmitter! Use
only Lectrosonics PN:28528 which is a Phillips head, 4-
40 x 3/16", FL100 screw.
UM700 Battery Installation
The transmitter is powered by a standard alkaline or
lithium 9 volt battery. Use alkaline or lithium batteries
for longest life. Standard zinc-carbon batteries marked
“heavy-duty” or “long-lasting” are not adequate. Ni-
cad or NiMH rechargeable batteries provide 1.5 hours
of operation, or less, and will run down quite abruptly.
Unless it is cold, alkaline batteries provide over 4.0
hours of operation. Lithium batteries can be used to
provide up to 7.5 hours. Care should be taken not to
leave a fully discharged lithium battery in the transmit-
ter, as swelling of the battery can make it difficult to
remove from the compartment. The battery status
circuitry is designed for the voltage drop over the life of
alkaline batteries.
To open the battery compartment, press outward on
the cover door in the direction of the arrow as shown in
the drawing. Only firm, sliding pressure is needed to
open and close the battery door. Swing the door open
and take note of the polarity marked inside showing the
location of the positive (+) and negative (-) terminals.
You can see the large and small contact holes inside
the battery compartment with the door open.
Insert the battery correctly and close the cover by
pressing the door closed and across, reversing the
opening procedure illustrated above. If the battery is
inserted incorrectly, the door will not close. Do not
force the door closed.
Swing the
door open
Press outward on the
battery door in this
direction
,
.
Belt Clip Attachment Screw location
Rio Rancho, NM 15

UDR700 / UM700 / UT700
UT700 Controls and Functions
Encryption Key Link Power LED
Power On/Off
Switch
Battery
Compartment
Power On/Off Switch
The Power On/Off slide switch is located on the outside
bottom of the unit and controls power to the transmitter.
Power LED
The Power LED glows green when the battery is good
and the On/Off switch is set to On. The LED glows red
as the battery voltage drops and blilnks when there is
about 30 minutes of operation left with the recom-
mended alkaline battery.
Note: A weak battery will sometimes cause the
POWER LED to glow green immediately after
being put in the unit, but will soon discharge to the
point where the LED will either glow red or the
transmitter shuts down. If the lamp fails to light,
the battery should be replaced.
Caution: A NiMH battery will give little or no
warning when it is depleted. If you wish to use
NiMH batteries in the unit, we recommend
trying fully charged batteries, noting the length
of time that the batteries will run the unit and
in the future use somewhat less than that time
to determine when the battery needs to be
replaced.
When the unit is first turned on, the Power LED also
blinks a code to indicate the current Security Level.
Level 1 - One blink
Level 2 - Two blinks
Level 3 - Three blinks
Modulation LEDs
-10 -20
Fine Coarse
Frequency Switches
Audio Level
Control
Hiding the Power LED
This unit has no provision for disabling the LEDs. The
Audio Level LEDs are covered during normal use but
the Power LED is exposed. If the light is objectionable,
we recommend covering the Power LED with a piece of
opaque tape.
Encryption Key Link
The Encryption Key Link is used to connect the trans-
mitter to the UDR700 Series receiver to set an encryp-
tion key.
Frequency Select Switches
Two 16-position rotary Frequency Select Switches
(located in the battery compartment) are used to adjust
transmitter’s operating frequency. The Coarse switch
adjustment adjusts the frequency in 1.6 MHz incre-
ments and the Fine switch adjusts in 100 kHz incre-
ments.
Frequency Switches
Coarse Fine
0 1 2
3
4
5
6
7
8
9
A
B
C
D
E F 0 1 2
3
4
5
6
7
8
9
A
B
C
D
E F
LECTROSONICS, INC.16

Battery
Battery Compartment
two printed circuit boards.
sized holes in the battery
Encrypted Digital Wireless System
Modulation LEDs
The Modulation LEDs (located under the Battery
Compartment Door) provide a visual indication of the
input audio signal level from the microphone. These
two bicolor LEDs can glow either red or green to
indicate modulation levels.
Signal Level -20 LED -10 LED
Less than -20 dB Off Off
-20 dB to -10 dB Green Off
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 db Red Red
Audio Level Control
The Audio Level control is used to set the audio input
level (or gain) for the proper modulation. Located under
the battery door, this control is rotated while speaking
or singing into the microphone to set the modulation
level.
Audio Level LEDs
Audio Level control
Locked Mode
The UT700 can be placed in a locked mode where
neither the Power On/Off Switch nor the Frequency
Select Switches have any further effect on operation.
This protects the unit from accidental power off or
misadjustment after it has been prepared for use.
To enter locked mode, start with the transmitter turned
on and toggle the Power On/Off Switch off and on
rapidly three times. (Each toggle must be shorter than
two seconds and there must never be more than 10
seconds between toggles.)
After the third toggle, the power LED will go out briefly,
then blink the current security level in red indicating
locked mode.
Locked mode can be cleared by removing the battery.
Note: Removing the transmitter battery may cause
noise in the associated receiver. It is suggested to
turn the receiver audio volume off prior to
removing the transmitter battery.
UT700 Battery Installation
Caution: The transmitter is designed for a
standard alkaline or lithium 9 volt battery. It is
important that you use an alkaline or lithium
battery for longest life. Standard zinc-carbon
batteries marked “heavy-duty” or “long-lasting”
are not adequate. Ni-cad rechargeable
batteries will only provide 1.5 hours of
operation, or less, and will run down quite
abruptly.
Alkaline batteries provide over 3.5 hours of operation
under normal conditions. Lithium batteries can provide
up to 6.5 hours. Care should be taken not to leave a
fully discharged lithium battery in the transmitter, as
swelling of the battery can make it difficult to remove
from the compartment. The battery status circuitry is
designed for the voltage drop over the life of alkaline
batteries.
The battery
compartment is
located in the
lower section of the
transmitter,
between the
Note the two differently
contact pad inside the
Battery Compartment.
Insert the battery so that the large hole in the battery
contact pad will line up with the large contact on the
battery. A spring-loaded plunger in the bottom of the
compartment (opposite the contact pad) secures the
battery in place.
Compartment Cover
The battery status is indicated by the Power LED
located on the UT700 bottom panel. The LED glows
green under normal circumstances when there is
sufficient power left in the battery. The LED changes to
red as the battery voltage drops and starts blilnking
when only about 30 minutes of operation left with the
recommended alkaline battery. Battery status is also
displayed on the Information and Status Display on the
front panel of the UDR700 receiver.
Note: It is possible to insert the battery backwards
and still be able to close the battery door. No
physical damage will occur but the transmitter will
not operate in this condition.
Rio Rancho, NM 17

UDR700 / UM700 / UT700
LECTROSONICS, INC.18

Encrypted Digital Wireless System
System Installation and Operating Instructions
System Setup
1) Locate a suitable operating location where the
receiver will not be subjected to extreme tempera-
ture variations and possible bumps and drops. Try
to route all wiring so it will not cross walkways or
aisles.
2) Connect the power. For AC operation, connect the
female end of the power cord to the AC input jack
on the rear panel and plug the other end into a
suitable electrical outlet.
4) Preset the UDR700 controls as follows:
Audio Monitor Level Control (front panel)
to minimum (CCW)
PHASE Switch (rear panel) to “0”
Analog Audio Output Control (rear panel)
fully CCW (-40 dBu)
If external DC power is desired, a power cord
needs to be fabricated. Use a standard 4-pin
female XLR connector for the receiver end and wire
it according to the diagram below (Pin 4 is positive
and Pin 1 is ground).
Antenna Input BNC Connectors
AC Power Input Jack
90 to 240 VAC, 50-60 Hz
Audio Monitor Level
(Counterclockwise)
External Power Connector 11-17
VDC
PHASE Switch (0)
Analog Audio Output Control
5) Connect the Audio Output XLR jack to your mixer
input. (Pins 2 and 3 of the XLR jack are HI and LO
and can be reversed with the Phase switch, Pin 1 is
common.)
Audio Output XLR jack
External DC
Power Supply
4-Pin XLR DC
4 1
23
2
1
PIN
3
4 + 11 to +17 VDC
Ground
Power Plug
3) Connect the antennas. You can use either two
remote antennas or two whip antennas with 90-
degree connectors to operate the UDR700; how-
ever, the operating range may be less with the whip
antennas than with the remote antennas. When
using remote antennas, for best performance place
them at least three feet from each other and as high
as possible with a direct line of sight path to the
transmitter.
Rio Rancho, NM 19

POWER Switch
UDR700 / UM700 / UT700
6) Set the front panel POWER switch to On and
observe the POWER UP SEQUENCE. (See
Information and Status Display Menus and Func-
tions.
Warning: Do not turn on the associated
transmitter(s)
.
7) When the Main Tuning Menu appears observe the
RF Level Indicator LEDs. (If the Main Tuning Menu
is not displayed, press and release the MENU
button to step through the menu selections until it is
displayed.) If any of the RF Level Indicator LEDs
glow or blink, use the SELECT Up or Down button
to locate a clear channel (no RF activity) from one
of the current factory preset frequency group. If a
clear channel is not available using one of the
factory preset frequencies, press and hold the
MENU button, then press the SELECT Up or Down
button to tune across the entire 25.5 MHz fre-
quency block (in 100 kHz steps) to locate one.
(See Information and Status Display Menus and
Functions, Main Tuning Menu and Group Tuning
Menu)
SELECT Down
MENU
SELECT Up
Information and Status Display
8) If necessary, install a fresh battery in the transmit-
ter. (See UM700 Battery Installation and UT700
Battery Installation.) Set the Frequency Select
Switches on the associated transmitter to match
those identified in the receiver’s Main or Group
Tuning Menus (the two rightmost characters on the
Information and Status Display).
Coarse Fine
UT700
Frequency Select Switches
(Inside Battery Compartment)
Coarse Fine
Frequency Select Switches
UM700
9) Determine the security level required. (See The
700 Series Encryption System.)
10) Turn the UDR700 Off, then press and hold the
SELECT Down button while turning the UDR700
back on. The display will show the current security
level. The default is Level 1.
11) Use the SELECT Up or Down buttons to choose a
new security level, then press the MENU button to
finalize the security level selection process. The
Information and Status Display displays a message
indicating the level of security (Level 1, 2 or 3).
Note: Changing security levels requires that a new
key be sent to the transmitter before the system
will operate. (See Changing Security Level and
Setting or Resetting Encryption Key.)
Warning: In Security Level 3, both the transmitter
and receiver must be turned on and set to the
same operating frequency prior to setting the
Encryption Key.
12) Press the MENU button to enter the Key Genera-
tion Menu. “MAKE NEW KEY?” will be displayed in
the Information and Status Display with an “Up”
arrow to the message’s right. (See Information and
Status Display, Menus and Functions, Key Genera-
tion Menu.)
13) Press the SELECT Up button and follow the
directions on the Information and Status Display.
Eventually the prompt “NEW KEY TO TX ^” is
displayed.
15) Connect the appropriate KEY CABLE Encryption
Cable between the transmitter and the UDR700
and turn on the transmitter.
UDR700 Security Jack
UT700 Key Cable
UT700
Power LED
Encryption
Key Link
UM700 Input Jack
Security Jack
UM700
UDR700
Modulation LEDs
UM700 Key Cable
LECTROSONICS, INC.20