Lectrosonics SRb5P User manual

SRb5P & SRb
Camera Slot Dual UHF Receiver
Featuring
Digital Hybrid Wireless®Technology
INSTRUCTION MANUAL
Rio Rancho, NM, USA
www.lectrosonics.com
Fill in for your records:
Serial Number:
Purchase Date:
U.S. Patent 7,225,135
See Quick Start Summary on page 2

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
2
Quick Start Summary
The following checklist includes the minimum required
settings to start using the receiver.
• Install either stand-alone or camera slot adapter kit,
the antennas and position the receiver as it will be
used (see pages 9-12).
• Connect power to the receiver (see pages 10,11).
• Set the DIVMODE for single or dual channel opera-
tion (see page 15,16).
• Set the COMPAT (compatibility) mode for the trans-
mitters to be used (see pages 15,16).
• Find clear operating frequencies for one or both
receivers (see pages 19-21).
• Set transmitters on the matching frequencies (see
transmitter manual).
• Verify transmitters are set to the same compatibility
mode as the receiver (see transmitter manual).
• Adjust transmitter input gain to match voice level
and mic position (see transmitter manual).
• Adjust receiver output level as needed for the cam-
era or mixer input level desired (see pages 15,16).
IMPORTANT:
FREQ.
WARNING
Performance will be degraded if
Receiver 2 is set 4.2 to 4.8 MHz higher
than Receiver 1. The LCD will also flash
this message periodically.

UHF Digital Hybrid Wireless®
Rio Rancho, NM 3
Table of Contents
Digital Hybrid Wireless®......................................................................................................4
Model Differences.................................................................... 4
SRb........................................................................................ 4
SRb5P.................................................................................... 4
General Technical Description ............................................... 5
RF Front-End and Mixer......................................................... 6
Microcontroller, PLL and VCO Circuits................................... 6
IF Amplifiers and SAW Filters ................................................ 6
Digital Pulse Counting Detector............................................. 6
DSP-Based Pilot Tone............................................................ 6
SmartSquelch™...........................................................................................................................6
Smart Noise Reduction (SmartNR™)..................................... 6
Supersonic Noise-Based
Dynamic Filter and Squelch................................................... 7
Talkback Function .................................................................. 7
Turn On and Turn Off Delays.................................................. 7
Audio Output Level ................................................................ 7
Test Tone................................................................................ 7
Power Supply ......................................................................... 7
LCD Display ........................................................................... 7
Front Panel Controls and Functions...................................... 8
Audio Outputs ........................................................................ 8
LCD Screen ........................................................................... 8
MENU/SEL Button ................................................................. 8
PWR/BACK Button ................................................................ 8
UP/DOWN Arrow Buttons ...................................................... 8
Rear Panel and Adapters ........................................................ 8
Camera Slot Adapters............................................................ 9
Installing Camera Slot Adapters ............................................ 9
Adapters for Stand-Alone Use ............................................. 10
Installing Rear Panel Adapters............................................. 10
Replacement Screw Kits...................................................... 10
Battery Adapter.................................................................... 10
Audio Output Cables............................................................ 11
External Power Cables......................................................... 11
Mounting and Orientation..................................................... 12
AMJ Rev. A Jointed Antenna ................................................ 13
LCD Main Window.................................................................. 14
Navigating the LCD ............................................................... 15
Main Window........................................................................ 16
Frequency Screen................................................................ 16
Setup Screens ..................................................................... 16
Menu Items .......................................................................... 16
Front Panel Shortcuts .......................................................... 18
Locking and Unlocking the
Front Panel Controls ............................................................ 18
LCD Backlight Setup............................................................ 18
Scanning for Clear Frequencies .................................... 19
Scan Window ....................................................................... 19
Zoom View Window.............................................................. 19
Pre-coordinated Frequencies............................................... 20
Frequency Coordination ....................................................... 21
Multi-channel System Checkout .......................................... 21
Troubleshooting..................................................................... 22
Specifications and Features................................................. 25
Service and Repair ................................................................ 26
Returning Units for Repair ................................................... 26

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
4
Digital Hybrid Wireless®
The Lectrosonics Digital Hybrid Wireless®uses innova-
tive technology to combine the advantages of digital
audio with the advantages of analog RF transmission.
The result delivers the superior sound quality of a digital
system and the excellent range of an analog system.
A proprietary algorithm encodes the digital audio infor-
mation 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.
SRb
This is the basic receiver with audio outputs on the rear
panel only.
SRb5P
An additional audio output is provided next to the front
panel for use with cameras that have only one audio
input in the mounting slot. When the receiver is used
outside of a camera, this extra audio output can be
used to feed a recorder or IFB transmitter while the rear
panel audio outputs feed a mixer or camera.
Model Differences
This digital/analog hybrid technique has some very
beneficial properties. Because the information being
transmitted is digitally encoded, immunity to noise is
much higher than what a compandor can offer. Because
the encoded audio is sent in analog format, spectral
and power efficiency and operating range are not com-
promised.
Under weak RF conditions, the received signal de-
grades 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.

UHF Digital Hybrid Wireless®
Rio Rancho, NM 5
General Technical Description
SmartDiversity™allows each receiver to run indepen-
dently to provide two separate audio channels. The
algorithm analyzes both the incoming RF level and the
rate of change in RF level to determine the optimum
timing for phase switching, and the optimum antenna
phase. The system also employs “opportunistic switch-
ing” to analyze and then latch the phase in the best
position during brief squelch activity.
Ratio Diversity blends the audio outputs of both receiv-
ers in a seamless manner to produce a single audio
output. A panning circuit blends more signal from the re-
ceiver with the stronger RF signal over a wide RF level
range to anticipate and eliminate dropouts long before
they occur. When a good RF signal is present at both
receivers and the audio is blended equally, the signal-
to-noise ratio is increased by 3 dB.
The design consists of two separate receivers built into
a single, ultra compact housing with interchangeable
adapters for video camera wireless receiver slots and
stand-alone use. Digital Hybrid Wireless®technology
provides superb, compandor-free audio quality and
compatibility with other wireless systems. The RF per-
formance is extremely stable over a very wide tempera-
ture range, making the receiver perfectly suited to the
rough environmental conditions found in field produc-
tion.
The front panel features a menu-driven LCD interface
and four membrane switches used to view and alter set-
tings. Audio outputs are provided on the rear panel for
camera slots or other audio devices, and in the case of
the SRb5P, also on the front panel through a 5-pin TA
Series connector.
A built-in spectrum analyzer scans across the tuning
range of the receiver to simplify finding clear operating
frequencies.
RF PCB Block Diagram
Audio PCB Block Diagram
Ref. Osc
SAW
filter
RF amp
Splitter
Phase
combiner
MixerIF
amp
SAW
filter
SAW
filter
IF
amp
Rx IC
250 kHz
RSSI
Windo
w
detect
Audio 1
Pulse
detector
1st
VCO
2nd
VCO
PLL
µP
SAW
filter RF amp
Splitter
Mixer
IF
amp
SAW
filter
SAW
filter
IF
amp
Rx IC
350 kHz
RSSI
Windo
w
detect
Audio 2
Pulse
detector
1st
VCO
2nd
VCO
PLL
µP
Receiver 1
Receiver 2
High side
injection
High side
injection
SR Dual Receiver RF Board
Phase
combiner
248.450
MHz
243.950
MHz
µPDSP
Keypad
LCD
display
DAC
Codec
Memory
Ref xtal
Audio 1
Audio 2
(from RF PCB)
To both PLL
To phase switches
Audio amps
Digital pot
Digital pot
µP
digital
atten
CH 1
audio switch
CH 2
audio switch
Fuse
Camera
power in
Osc
sync
DC-DC
conv
DC-DC
conv
DC-DC
conv
On/O
–5V +5V Osc
sync
+1.6V
+3.3
V Reg
+3.3V
5k
5k
50
50 +
–
Com
Hi
Lo
+5V
+5V
5k
5k
50
50 +
–
Com
Hi
Lo
+5V
+5V
Diode
protected
outputs
123
45
µP
polarity

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
6
RF Front-End and Mixer
Each antenna signal is first passed through a high qual-
ity SAW filter to reject high power RF signals above and
below the operating frequency. A high current amplifier
follows the SAW filters and passes the signal to an in-
ternal splitter so that both antenna signals are available
to both receivers for SmartDiversity™ reception.
The mixer in each receiver takes the signal from the
PLL to generate the first IF signal, with both PLL circuits
fed from a common reference oscillator to maintain
signal phase through the IF sections.
Microcontroller, PLL and VCO Circuits
The 8-bit microprocessor is the “heart” of the SRb5P
and SRb receivers. 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 transmitter battery status. Outputs from the
microcontroller drive the LCD display and backlight, and
control the squelch, the audio output attenuator, the
PLL/VCO circuits and the antenna phase switch.
IF Amplifiers and SAW Filters
The first IF stage employs two SAW (surface acoustic
wave) filters. The use of two filters significantly increas-
es the depth of filtering while preserving sharp skirts,
constant group delay, and wide bandwidth. Though ex-
pensive, this special type of filter allows primary filtering
as early as possible, at as high a frequency as possible,
before high gain is applied, to deliver maximum image
rejection. Since these filters are made of quartz, they
are very temperature stable.
After the SAW filter, the IF signal is converted to 350
kHz in receiver 1 and 250 kHz in receiver 2. Only then
is the majority of the gain applied, just before the signal
is converted to audio with a pulse counting detector.
Although these IF frequencies are unconventional in a
wide deviation (±75 kHz) system, it offers outstanding
AM rejection over a very wide range of signal strengths
and improved noise performance.
Digital Pulse Counting Detector
The receiver uses an elegantly simple, yet highly effec-
tive digital pulse detector to demodulate the FM signal,
rather than a conventional quadrature detector. This
unusual design eliminates thermal drift, improves AM
rejection, and provides very low audio distortion.
DSP-Based Pilot Tone
The Digital Hybrid system design uses a DSP gener-
ated ultrasonic pilot tone to control the receiver audio
muting (squelch). The pilot tone frequency is different
for each of the 256 frequencies in the tuning range of a
system (frequency block). This eliminates squelch prob-
lems in multichannel systems where a pilot tone signal
can appear in the wrong receiver via intermodulation
products.
The DSP generated pilot tone also eliminates fragile
crystals, allowing the receiver to survive shocks and
mishandling much better than older analog-based pilot
tone systems.
Note: This description applies only to the Digital
Hybrid mode. In 200 Series, IFB and Mode 6
compatibility, 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.
SmartSquelch™
Any squelching system faces inevitable trade-offs:
squelch too aggressively and valuable audio information
may be lost. Squelch too little and excessive noise may
be heard. Respond too rapidly and the audio will sound
“choppy.” Respond too sluggishly and syllables or entire
words can be cut off.
SmartSquelchTM 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 syl-
lable 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. Us-
ing these and other techniques, the SRa5P and SRa can
deliver acceptable audio quality from otherwise unusable
signals.
Smart Noise Reduction (SmartNR™)
Note: The SmartNR setting is user selectable
only in the Digital Hybrid compatibility 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 wide dynamic range of digital hybrid technology,
combined with flat response to 20 kHz, makes it pos-
sible to hear the -120 dBV noise floor in the mic pre-
amp, or the (usually) greater noise from the microphone
itself. To put this in perspective, the noise generated
by the recommended 4k bias resistor of many electret
lavaliere mics is –119 dBV and the noise level of the
microphone’s electronics is even higher. In order to
reduce this noise the receiver is equipped with a Smart
Noise Reduction algorithm, which removes hiss without
sacrificing audio high frequency response.
The Smart Noise Reduction algorithm works by at-
tenuating only those portions of the audio signal that fit
a statistical profile for randomness or “electronic hiss.”
Because it is much more than a sophisticated variable
low pass filter, the transparency of the audio signal is
preserved. Desired high frequency signals having some
coherence are not affected, such as speech sibilance
and tones.

UHF Digital Hybrid Wireless®
Rio Rancho, NM 7
The Smart Noise Reduction algorithm has three modes,
selectable from a user setup screen. The optimal setting
for each application is subjective and selected while
simply listening.
• OFF defeats noise reduction and complete trans-
parency is preserved. All signals presented to the
transmitter’s analog front end, including any faint
microphone hiss, will be faithfully reproduced at the
receiver output.
• NORMAL applies enough noise reduction to re-
move most of the hiss from the microphone preamp
and some of the hiss from lavaliere microphones.
The noise reduction benefit is significant in this
position, yet the degree of transparency maintained
is exceptional.
• FULL applies enough noise reduction to remove
most of the hiss from nearly any signal source of
reasonable quality and some high frequency envi-
ronmental noise, assuming levels are set properly
at the transmitter.
Supersonic Noise-Based
Dynamic Filter and Squelch
In addition to SmartNR, all hybrid receivers are
equipped with a supersonic noise-based dynamic filter
and squelch system. The incoming audio is monitored
for energy above 22 kHz, pilot tone excepted. Excessive
high frequency energy indicates that the received signal
is too weak to achieve an acceptable signal-to-noise
ratio. Under marginal conditions, a variable low pass
filter is rolled in dynamically, masking the noise while
preserving as much of the transmitted signal as pos-
sible. 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. Perfor-
mance 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.
Talkback Function
The Talkback function works with the HH hand held
transmitter to use one of the output channels for com-
munication with staff and crew. One of the audio outputs
is connected to the mixer, recorder or house feed. The
other output is connected to a “com” channel.
When the talkback button on the transmitter is pressed,
the audio output on the receiver is switched to the
opposite output jack. When the button is released, the
audio output toggles back to the original output jack.
Turn On and Turn Off Delays
A brief delay is applied when the receiver is powered up
or down to prevent audible noise such as a thump, pop
or other transient noise.
Audio Output Level
A setup screen is provided for adjusting the audio out-
put level in 1 dB increments from -50 to +5 dBu using
the front panel UP and DOWN buttons.
Test Tone
To assist in matching the audio levels of equipment
connected to the SRb5P or SRb, 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 setup window.
Power Supply
The SRb5P and SRb is operated from an external DC
power source. The power supplies are protected from
damage to the receiver that could occur if a positive
ground power source is applied.
LCD Display
The display has four primary windows. Pressing the
Front Panel SEL button steps through each of these
windows.
If a battery gets low on one of the transmitters, a mes-
sage 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 fre-
quency, audio level, transmitter battery type and other
user settings.

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
8
Front Panel Controls and Functions
Audio Outputs
A second set of audio outputs is provided next to the
front panel for use with cameras that have only one au-
dio channel enabled in the slot. One channel can feed
the connector in the camera slot, and the second chan-
nel can be connected to the external audio jack on the
camera with a cable. When the receiver is used outside
of a camera, the front panel jack can be used to feed
audio to a recorder, IFB transmitter or camera while the
rear panel outputs feed the main production mixer.
The front panel 5-pin connector (TA5M type) provides
two balanced outputs with the following pinouts:
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5
Shields CH1 + CH1 – CH2 + CH2 –
LCD Screen
A backlit, graphics-type Liquid Crystal Display is used
to set up and monitor the receiver. The Main Window
shown here is used during normal operation, to display
RF and audio levels, transmitter battery status, pilot
tone status and diversity activity for both receivers.
MENU/SEL Button
This button is used to select menu items and enter
setup screens during setup.
PWR/BACK Button
Press the PWR/BACK switch to turn the power on.
Press and hold it until the display goes blank to turn
power off. It also functions as a “back” button while navi-
gating the various menus and setup screens to return to
the previous screen or menu item.
The firmware “remembers” whether the receiver was
turned on or off after power is disconnected, and it
returns to that state when power is restored. This allows
the receiver to power up and down as the camera or
external supply is turned on and off.
Press the PWR/BACK button from the Main Window to
briefly display the external power voltage.
UP/DOWN Arrow Buttons
The UP and DOWN arrow buttons are used to select
various options and adjust values in the setup screens,
and provide secondary functions such as locking out
the panel to guard against accidental changes.
Rear Panel and Adapters
Several different panel adapters are available to config-
ure the receiver for use with popular camera slots and
for stand-alone use. The adapters are retained by two
screws through the side panel of the housing, making
them easy to install.
Power and audio connections are made through mating
connectors on the adapter and receiver main circuit
boards.
DOWN Button
MENU/SELECT
Button
POWER/BACK
Button
UP Button
Receiver 1 Receiver 2
LCD Main Window with two channels shown
Audio
Output

UHF Digital Hybrid Wireless®
Rio Rancho, NM 9
Camera Slot Adapters
SRSUPER
Adapter kit for Un-
islot®camera slots
such as those pro-
vided on Ikegami®
and Panasonic®
cameras.* Includes
bezel, hardware
and rear panel
DB25 connector
wired for power
and audio connec-
tions.
SRSNY
Adapter kit for
Sony®camera
slots,* includes be-
zel, hardware and
rear panel DB15
connector wired for
power and audio
connections.
Installing Camera Slot Adapters
SRSUPER Adapter
Thread two short
screws through the
recessed tabs on the
adapter and slide
it onto the receiver
housing. Thread two
short screws through
the tabs on the
receiver flange as
shown.
On the opposite
side, thread two long
screws through the
tabs on the receiver
flange, then align
them with the tabs
on the adapter.
Slide the adapter
up and tighten the
retaining screws
to secure it to the
receiver flange.
The four lower
screws attach to the
camera body.
SRSNY Adapter
Two different types of screws are used to attach the
receiver flange and the adapter.
Thread the smaller, thin head screws through the
adapter and into the camera body.
Upper screws with thicker
heads secure the receiver
to the adapter.
Lower screws with thinner
heads secure the adapter
to the camera body.
NOTE: If you are having difficulty inserting
the receiver into the camera slot, try mounting
the blue adapter plate to the camera first, then
inserting the receiver.
* UniSlot®is a trademark of Ikegami Tsushinki Co., Ltd.
Ikegami®is a registered trademark of Ikegami Tsushinki Co., Ltd.
Panasonic®is a registered trademark of Matsushita Electric Industrial Co., Ltd.
Sony®is a registered trademark of Sony Kabushiki Kaisha TA Sony Corporation.

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
10
Installing Rear Panel Adapters
Installation of the rear panel output/power adapters is
the same for all models.
Panels are held in
place by two phil-
lips head screws
on the sides of the
housing.
Connections
between the panel
and main circuit
board are made
via miniature mat-
ing connectors.
Align the mating
connectors and
slide the panel
straight into the
housing until the
screw holes align
with the housing.
Adapters for Stand-Alone Use
SREXT For stand-alone use,
this kit includes a
rear panel with two
TA3 male jacks for
the balanced out-
puts and a power
jack with a locking
connector. Trim the
power cable to the
desired length.
SRHARNESS
Ideal for use in por-
table “bag systems.”
Two balanced output
cables and the power
cable are 6 feet long.
Cut the cables to the
desired length and
terminate as needed.
Battery Adapter
The receiver can be
powered with an
optional “battery
sled” adapter that
attaches to the top
or bottom outside
of the housing
(Lectrosonics
Model SRBATT-
SLED). The
adapter includes an integrated connector plate and
accepts L and M type video camera rechargeable
batteries. The adapter sled does not include charging
circuitry. Batteries must be recharged with their respec-
tive chargers.
The unit has an integral circuit that automatically
selects between the battery or the external source,
whichever delivers the highest voltage.
Replacement Screw Kits
SRSNYSCREWKIT
Contains:
5 - #28863 (smaller mid-length)
5 - #28864 (larger mid-length)
5 - #28869 (shortest)*
* For Housing
SRSUPERSCREWKIT
Contains:
3 - #28862 (longest)
5 - #28864 (mid-length)
3 - #28869 (shortest)*
* For Housing

UHF Digital Hybrid Wireless®
Rio Rancho, NM 11
Audio Output Cables
MCSR5PXLR5P
Right angle TA5F plug
to 5-pin XLR; balanced
outputs; 25 inches long.
For TA5M output jacks.
MCSR5PXLR2
Right angle TA5F plug to
two 3-pin XLR; balanced
outputs; 20 inches long.
For TA5M output jacks.
RATPAC Adapter Kit
Adapter kit to build either
a 3-pin or 5-pin TA Series
right angle connector.
Includes standard 5-pin
connector, modified 3-pin
insert and backshell,
aluminum right angle
housing, strain relief
tubing, set screws and
wrenches.
MCSRPT
12 inch long TA3 female to
stripped and tinned wires
for balanced output.
PIN 1: Shield
PIN 2: Audio (+) white
PIN 3: Audio (-) green
MCSRXLR
12 inch long TA3 female to
XLR male 3-pin for balanced
output.
PIN 1: Shield
PIN 2: Audio (+)
PIN 3: Audio (-)
MCSRTRS
Male 3.5 mm TRS plug
to two female TA3 (mini
XLR) connectors for
dual channel use.
External Power Supply
DCR12/A5U
AC power supply for IFBT4
transmitters; 100-240 V, 50/60
Hz, 0.3 A input, 12 VDC
regulated output; 7-foot cord
with LZR threaded locking
plug and interchangeable
blades/posts for use in Europe,
UK, Australia and USA (sold
separately).
External Power Cables
21747
Locking LZR style plug
to stripped and tinned;
6 feet long.
21746
Locking LZR style plug
to stripped and tinned;
12 inches long.
PS200
Hirose 7-4 pin to LZR
type locking plug, 12”
long.
21425
6 ft. long power cord; coaxial to stripped & tinned leads.
Coaxial plug: ID-.080”; OD-.218”; Depth- .5”.
.475”
.375”O.D.
21472
6 ft. long power cord; coaxial to stripped & tinned leads.
Right angle coaxial plug: ID-.075”; OD-.218”; Depth-
.375”
.375”
.35”
.375”O.D.
21586
DC16A Pigtail power cable, LZR stripped & tinned.
Thread lock collar.
.475”O.
D.
Locking collar with
5/16”-32 thread

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
12
Mounting and Orientation
Installation into the slot on a video camera places the
antennas in an optimal vertical position away from the
camera body.
When used with non-slot cameras, as depicted in the
diagram below, one or two receivers can be positioned
in a variety of locations around the camera body using
the Velcro and SRSLEEVE mounting options.
Mounting the receiver horizontally on the side of a camera
can seriously reduce the operating range of the wireless
system.
For maximum operating range, the antennas should be
vertical and above the camera body. While it may be
convenient, mounting the receiver horizontally on the
side of the camera can seriously reduce the operating
range of the wireless system.
The receiver provides stand-
alone operation with the battery
sled adapter and mounting
sleeve. It can be mounted in
any position with Velcro, or in
horizontal and vertical positions
using the mounting foot.
SRSLEEVE Mount
An optional mounting sleeve is available to simplify
mounting the receiver on camera body, battery brack-
ets and other locations. The sleeve is furnished with a
hook/loop Velcro swatch for mounting on flat surfaces.
SRHARDWARE Cold Shoe Adapter
This hardware and adapter kit allows the SRSLEEVE to
be mounted on a “cold shoe.” A right angle bracket is in-
cluded so the sleeve can be mounted in a horizontal or
vertical position. Vertical mounting is generally preferred
because the antennas will provide a circular, horizontal
pattern. For indoor applications where multipath reflec-
tions are prevalent, the best antenna orientation can be
discovered by simple walk test while observing the RF
level indicators on the receiver LCD.
RATPAC Connector
The 5-pin RATPAC right angle connector is designed for
the front panel output jack. The 3-pin version is de-
signed for the rear panel outputs on the receiver.
The connector can be
rotated during assembly
to exit the cable in the
desired direction. See
instructions included
with the RATPAC kit.

UHF Digital Hybrid Wireless®
Rio Rancho, NM 13
470 470.100 - 495.600 Black w/ Label 5.56” 141.2 mm
19 486.400 - 511.900 Black w/ Label 5.27” 133.9 mm
20 512.000 - 537.500 Black w/ Label 4.93” 125.2 mm
21 537.600 - 563.100 Brown w/ Label 4.71” 119.6 mm
22 563.200 - 588.700 Red w/ Label 4.48” 113.8 mm
23 588.800 - 614.300 Orange w/ Label 4.27” 108.5 mm
24 614.400 - 639.900 Yellow w/ Label 4.07” 103.4 mm
25 640.000 - 665.500 Green w/ Label 3.87” 98.3 mm
26 665.600 - 691.100 Blue w/ Label 3.68” 93.5 mm
27 691.200 - 716.700 Violet (Pink) w/
Label
3.52” 89.4 mm
28 716.800 - 742.300 Grey w/ Label 3.36” 85.3 mm
29 742.400 - 767.900 White w/ Label 3.22” 81.8 mm
30 768.000 - 793.500 Black-w/Label 3.08” 78.2 mm
31 793.600 - 819.100 Black-w/Label 2.97” 75.4 mm
32 819.200 - 844.700 Black-w/Label 2.89” 73.4 mm
33 844.800 - 865.000 Black-w/Label 2.81” 71.4 mm
944 944.100 - 951.900 Black-w/Label 2.53” 64.3 mm
BLOCKFREQUENCY CAP/SLEEVE ANTENNA
RANGE COLOR WHIP LENGTH
The AMJ antenna is a general purpose design for any
Lectrosonics receiver or transmitter with a standard
SMA connector. The hinged joint pivots in both direc-
tions for positioning the whip at any desired angle.
32
470
944
33
31
21
22
23 24
25 26 27
28 29
30
20
19
AMJ KIT CUTTING TEMPLATE
Lay uncut antenna on this template and cut to length for the desired frequency block
Note: Check the scale of your printout. This line should be 6.00 inches long (152.4 mm).
Whip Length
Tr im the end of the color cap and slide the remaining sleeve over the whip - OR - Glue color cap onto the end
*Cut end of cap off
and slide over whip Frequency Blocks *Color cap
32
470
944
33
31
21
22
23 24
25 26 27
28 29
30
20
19
AMJ KIT CUTTING TEMPLATE
Lay uncut antenna on this template and cut to length for the desired frequency block
Note: Check the scale of your printout.This line should be 6.00 inches long (152.4 mm).
Whip Length
Tr im the end of the color cap and slide the remaining sleeve over the whip - OR - Glue color cap onto the end
*Cut end of cap off
and slide over whip Frequency Blocks *Color cap
The hinged joint pivots in both directions
AMJ Rev. A Jointed Antenna

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
14
LCD Main Window
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.
Pressing the MENU/SEL button accesses the menus
and screens for setting up the receiver and searching
for clear frequency channels.
Pilot Tone Indicator
A steady “P” icon will be displayed when a pilot tone from the transmitter is present. The “P” will ap-
pear only in those compatibility modes which use pilot tone, such as the native Digital Hybrid, 200 Se-
ries, IFB modes and Mode 6. The icon will flash if no pilot tone is detected and will change to a small
“b” if the pilot tone has been bypassed. To bypass or enable the pilot tone on Receiver 1, hold MENU/
SEL button and press the UP button briefly. To bypass or enable the pilot tone on Receiver 2, hold
MENU/SEL and press the DOWN button briefly. Bypassing the pilot tone also disables the squelch,
regardless of which compatibility mode has been selected.
Channel Mute
The audio output can be muted on Receiver 1 by holding the MENU/SEL button and holding the UP
button for about a second or more. Receiver 2 can be muted by holding MENU/SEL and then hold-
ing the DOWN button. The same buttons toggle the mute status off. An “M” will appear on the screen
when a channel is muted. In ratio diversity mode, the UP button is used and a signal M appears.
Antenna Phase Indicator
This antenna icon is displayed when the SWITCHING DIVERSITY mode is selected. 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.
Audio Levels
One icon is used in the SWITCHED DIVERSITY mode and the other when RATIO DIVERSITY is
selected. The 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.
Battery Levels
When the COMPAT mode is set for a compatibility mode that supports battery telemetry (Digital
Hybrid and 200 Series), a battery icon is displayed on the LCD to indicate the transmitter battery
condition. The receiver will periodically check the battery voltage and update the icon in a “fuel guage”
manner. In the example at left, the icon indicates about “half full.” When other COMPAT modes are
selected, this area of the LCD will be blank.
If selected in the TXBAT setup screen, a transmitter battery timer is available for any compatibility
mode. It accumulates hours and minutes whenever the transmitter is turned on, and retains the ac-
cumulated time even when the receiver is off. The icon represents a digital clock readout (rotated 90
degrees clockwise) and in this example is indicating 4 minutes. To reset the battery timer, change
the selection in TXBAT to something other than a timer mode (NOT AAT or 9VT).
Icon Description
NOTE: When the RATIO DIVERSITY mode
is selected, both receivers are combined to
pick up the same transmitter, so the Main
Window will display a single audio channel.
Receiver 1
RF Level
Receiver 2
RF Level
Audio
Level
Transmitter
Battery Level
RF Level Audio Level
Transmitter
Battery Level
Pilot Tone
Indicator
Receiver 1 Receiver 2 Diversity
Activity

UHF Digital Hybrid Wireless®
Rio Rancho, NM 15
Navigating the LCD
NOTE: This setting does not
appear when the MIXMODE
is set to DIRECT
NOTE: Press the
BACK button from
the Main Window
to briefly display
the external power
supply voltage.
NOTE: To reset the timer, set the TXBAT
mode to anything other than 9VT or AAT,
then back to the desired mode.
HYB
SETUP
(item)
180
652.800
2AF
657.500
TUNING
MENU
BACK
BACK
MENU
Receiver 1
Pilot Tone
ON\OFF
Hold MENU and
hold DOWN
Hold MENU
and hold UP
Mute Audio on
Receiver 1
Mute Audio on
Receiver 2
Press
UP/DOWN
to select
Press
UP/DOWN
to adjust
RECEIVER 1
00 00 00
RECEIVER 2
SEL
BACK
SEL
SEL
BACK
SEL
SCANNING
STARTS
SEL
SCANNING
STOPS
Press
SEL to
select
receiver
Press UP/DOWN
to scroll
frequency
Press both
UP and DOWN
to ZOOM
Press UP/DOWN
to scroll
frequency
MENU
BACK
Setup Screen
Main Window
Receiver 1
Receiver 2
Press UP/DOWN to change frequency
Press UP/DOWN to change frequency
DIVMOD
RATIO
Press
UP/DOWN
to select
NOTE: Main Window will look like this
when the RATIO DIV mode is selected.
LEVEL LEVEL
00
DOWN
DOWN
DOWN
DOWN
DOWN
DOWN
DOWN
DOWN
DOWN
SEL
BACK
COMPAT
HYB HYB HYB
COMPAT
B3
B3
2
4A
1
5E
BACK
BACK
ZOOM GRAPHIC
BACK
SEL
BACK
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
SEL
BACK
TUNING TUNING
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
a
NOR a
NOR
Press
SEL to
select
receiver
Press
SEL to
select
receiver
SEL
BACK
SmtNR SmtNR
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
FULNOR
Press
SEL to
select
receiver FUL
NOR
LEVEL
SETUP
SCAN
SETUP
DIVMODE
SETUP
COMPAT
SETUP
SmtNR
SETUP
PHASE
SETUP
TXBAT
SETUP
MIXMODE
SETUP
TONE
SETUP
SEL
BACK
PHASE PHASE
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
Press
SEL to
select
receiver
++
SEL
BACK
TXBAT TXBAT
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
Press
SEL to
select
receiver
SEL
BACK
MIXMODE Press
UP/DOWN
to select
SEL
BACK
TONE?
RECEIVER 1 RECEIVER 2
Press
UP/DOWN
to select
Press
SEL to
select
receiver
00+05
Tone will be enabled
when level is set with
the UP/DOWN buttons
TONE?
00+05
LVL 1K
RECEIVER 1
00+05
BACK
UP
UP
UP
UP
UP
UP
UP
UP
UP
DOWN
RATIO 80
652.800
When the receivers are combined in the
RATIO DIVERSITY mode, the frequency
screen will look like this.
MIXBOTH
DOWN
MIXTRIM
SETUP SEL
BACK
MIXTRIM
UP
00+05
MIXTRIM
Press
SEL to
select
receiver
00 +05
Press
UP/DOWN
to select
Receiver 2
Pilot Tone
ON/OFF
Hold MENU and
press UP
momentarily
Hold MENU and
press DOWN
momentarily
9V 9V 9V
9V
COMPAT
SETUP
ALT
TALKBACK HYB/TB
COMPAT
Main Window
will vary
depending upon
the DIVMODE
selected.
SWITCHED RATIO
Press MENU
then
UP/DOWN to
select
Talkback mode
must be selected
on receiver 1
IMPORTANT:
FREQ.
WARNING
Performance will be degraded if
Receiver 2 is set 4.2 to 4.8 MHz higher
than Receiver 1. The LCD will also flash
this message periodically.

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
16
Main Window
The appearance of the LCD Main Window will change
according to which diversity mode is selected:
• SWITCH (2-channel mode) splits the screen to
indicate activity and levels on both receivers and
transmitters.
• RATIO combines the audio outputs of both receiv-
ers to deliver a single audio channel.
With the DIV MODE set to
SWITCH, two audio channels
will be displayed.
With the DIV MODE set to
RATIO, a single audio channel
will be displayed.
Frequency Screen
Press MENU/SEL from the Main Window once for Re-
ceiver 1 and twice for Receiver 2. The selected receiver
is denoted in the upper left corner of the screen.
Press BACK to move from
Receiver 2 back to Receiver 1,
and again to return to the Main
Window
180
652.800
2A
F
657.500
In this example, the upper screen denotes that receiver
1is set at 652.800 MHz, requiring that any transmitter
with hex switches be set at 80 for this frequency. Lectro-
sonics transmitters with LCD interfaces allow frequency
to be set in MHz or hex settings.
Press the UP and DOWN buttons to change the fre-
quency of the receiver. When the tuning mode is set to
NORMAL, the UP and DOWN buttons tune in single
channel increments. In the group tuning modes, the UP
and DOWN buttons step through the pre-coordinated
frequencies. (see the section on the next page entitled
Using the Group Tuning Modes)
Setup Screens
From the Main Window, press MENU/SEL three times
to enter the setup screens. Press UP and/or DOWN to
scroll through the available items and press MENU/SEL
to enter the desired screen. For those items that allow
separate settings for each receiver, press MENU/SEL
repeatedly to toggle back and forth between Receiver 1
and Receiver 2, then press the UP and DOWN buttons
to select the value or option, then press BACK to return
to the previous screen.
SHORTCUT: Hold the MENU/SEL button in while
pressing the UP or DOWN arrow to jump in 16
channel increments (1.6 MHz steps).
Menu Items
LEVEL
This setup screen displays the audio output level of the
receiver in dBu when the transmitter is fully modulated.
Press the MENU/SEL button to toggle between receiver
1 and receiver 2. Use the UP or DOWN buttons to
change the level. Range is from -50 to +5 dBu in 1 dB
steps. Press the BACK button to leave this screen.
The output levels at the two jacks may be set indepen-
dently, regardless of the diversity mode setting.
SCAN
This function provides a fast and reliable method of
finding clear channels for each receiver. Press SEL to
start the scanning. Follow the procedure outlined in the
navigation map on the previous page and on the page
entitled Scanning for Clear Frequencies for instructions
on using the scanner to find clear channels.
DIVMODE
The SWITCH diversity mode (dual channel mode) al-
lows the two internal receivers to operate independently
on different frequencies and settings with two different
transmitters. Diversity reception uses an antenna phase
switching technique on each receiver. When this mode
is selected, the setup screens will prompt you to select
the receiver to be adjusted.
The RATIO mode combines the two internal receiv-
ers to pick up the same transmitter and mix their audio
outputs for ratio diversity reception. Diversity reception
mixes the audio outputs in a ratio panning mode. In this
mode, the setup screens will prompt you for a single
value which will automatically be set for both receivers.
COMPAT (includes Talkback mode)
The COMPAT setup screen selects the type of transmit-
ter used with the receiver. The available modes are:
• HYB is used with Lectrosonics Digital Hybrid trans-
mitters. This is the default setting and should be
used if your transmitter supports it. This mode offers
the best audio quality.
• 100 for Lectrosonics 100 Series transmitters.
• 200 for Lectrosonics 200 Series transmitters.
• IFB for Lectrosonics IFB transmitters.
• M.3, M.6 and M.7 are compatible with certain non-
Lectrosonics transmitters. Contact the factory for
details.
• HYB/TB selects the Talkback mode where the
audio is switched to channel 2 when the talkback
button on the transmitter is pushed.
When the Talkback mode is selected, the receiver is
configured so that the program audio output is on chan-
nel 1 and the talkback output is on channel 2.
The Talkback mode is used only with a matching trans-
mitter such as the HH hand held model that includes
this feature. See transmitter manual for details.

UHF Digital Hybrid Wireless®
Rio Rancho, NM 17
TUNING
In addition to the NOR (normal) mode, this screen also
allows Selection of one of four factory pre-selected
frequency groups (Groups a through d) or two user
programmable frequency groups (Groups u and v).
• NOR allows selection of all 256 frequencies that the
receiver will tune. Each press of the UP or DOWN
button will step in 100 kHz increments to the next
frequency.
• a, b, c, d sets the receiver to tune only factory
preselected frequencies, up to eight in each group.
Each press of the UP or DOWN button will step to
the next frequency in the group.
• u, v allow up to 16 user-selected frequencies to
be stored in each group. Each press of the UP or
DOWN button will step to the next stored frequency
in the group.
Note: The Tuning Setup Screen only selects the
tuning mode (NORMAL or Group Tuning). Actual
operating frequencies are chosen through the
Frequency Screens.
USING THE GROUP TUNING MODES
Press MENU to select receiver 1 or 2.
When a tuning group is
Selected, a letter will appear
next to the hex switch settings.
105
640.500
a
Holding the MENU/SEL button while pressing the UP or
DOWN button will step to the next frequency in 100 kHz
steps, which will select a frequency that is not stored
in the group. In this case, the group letter in the display
will blink to indicate that the selected frequency is not
included in the group.
The letter will blink when
a frequency outside of the
tuning group is Selected.
105
640.500
a
When no frequencies are stored in groups u and v, the
UP and DOWN buttons will function the same as in
the NORMAL mode (each press moves up or down in
100kHz steps).
When only one frequency is stored in group u or v, the
UP and DOWN buttons will not change the frequency. In
this case, hold the MENU/SEL button in and then press
UP or DOWN to scroll to the desired frequency.
To add a frequency to tuning either group u or v, Select
the desired frequency, then hold the MENU/SEL button
in and then hold the UP or DOWN button in until the
letter stops blinking.
To delete a stored frequency, select it with the UP and
DOWN buttons, then hold the MENU/SEL button in,
then hold the UP or DOWN button in until the letter
starts blinking.
SmtNR
This setup screen is available only in the Digital Hybrid
COMPAT (compatibility) mode. Select the desired mode
while listening to the audio to of one of three choices:
• OFF provides no noise reduction for complete
transparency, which is useful in controlled environ-
ments with very little high frequency noise such as
an indoor motion picture production set.
• NORMAL applies a moderate amount of noise
reduction to noticeably reduce hiss from subtle
sources such as electret microphones.
• FULL is very similar to the Lectrosonics noise
reduction system used for many years in the 195
and 200 Series analog systems. Hiss from electret
microphones and some environmental HF noise are
suppressed.
PHASE
This setup screen allows the audio output phase to be
inverted to compensate for situations such as phase
reversal caused by microphone wiring.
TXBAT
This setup screen allows you to Select the exact battery
being used in the transmitter to provide more accurate
battery level monitoring.
When the COMPAT mode is set to HYB (Digital Hybrid)
or the 200 Series mode, the choices are:
• 9V - Transmitter uses a 9V alkaline battery.
• 9VL - Transmitter uses a 9V lithium battery (not
rechargeable).
• 9VT - Transmitter uses a 9V battery of any type.
Monitor its status with the timer in the LCD Main
Window. This is the best choice when using a re-
chargeable battery in the transmitter.
• AA - Transmitter uses a AA alkaline battery.
• AAL - Transmitter uses a AA lithium battery (not
rechargeable).
• AAT - Transmitter uses an alkaline, lithium or re-
chargeable AA battery. This is the best choice when
using a rechargeable battery in the transmitter.
In compatibility modes other than Digital Hybrid and
200 Series, no battery telemetry information is avail-
able, so the TXBAT setup screen offers only two
choices:
• --- (no timer) - Display no transmitter battery status
in the main window.
• TIM - Monitor the transmitter battery status with the
battery timer in the LCD Main Window.
NOTE: To reset the timer, set the TXBAT mode to
anything other than 9VT or AAT, then back to the
desired mode.

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
18
MIXTRIM and MIXMODE
When set to the SWITCHED (dual channel mode),
special options are available to allow the audio from the
receivers to be mixed to either one or both audio output
channels.
The MIXMODE setting determines which audio signal
appears at which output channel:
• MIXBOTH mixes the audio and delivers the mix to
both output channels.
• MIXTO 1 mixes the audio and delivers the mix to
output channel 1.
• MIXTO 2 mixes the audio and delivers the mix to
output channel 2.
• DIRECT keeps the audio separated and delivers
receiver 1 audio to output channel 1, and receiver 2
audio to output channel 2.
The MIXTRIM setting applies attenuation up to 20dB in
1 dB steps to adjust the ratio of the two audio signals in
the mix. This adjustment takes effect only when a mix
mode is selected (it is ignored when the mix mode is
set to DIRECT).
IMPORTANT: The output level of each receiver
is adjusted with the LEVEL setup screen, which
is hardware-based, so it affects the output
level regardless of which mix mode is selected.
MIXTRIM then applies attenuation to that level
setting resulting in the final level delivered to
the output channel. It is good practice to set the
output level of both receivers to the same
value when using a mix mode.
When a MIXMODE is selected, each audio signal is au-
tomatically attenuated by 6 dB prior to the mixing. This
is done to avoid overload and potential distortion since
mixing increases the level by 6 dB. The same input gain
on the camera or mixer can generally be used regard-
less of whether or not a mix mode is being used in the
receiver.
TONE
The TONE setup screen enables an audio test tone at
the receiver output for precise level matching with other
equipment. The first screen prompts you to press the
UP or DOWN button to enable the tone at the receiver
output. Press MENU/SEL to toggle between receivers.
The first screen prompts you
to press the UP or DOWN
button to start the tone.
RECEIVER 2
TONE?
00+05
Once the button is pressed, a 1 kHz tone is enabled,
and its level can be adjusted with additional presses on
the UP or DOWN buttons.
The level set here will be retained in the regular operat-
ing 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
BACK button.
Front Panel Shortcuts
A convenient shortcut is available from any setup
screen that displays the receiver selection option
(switching diversity, dual channel mode). Once the value
has been set on one receiver, the same value can be
copied to the other receiver with a simple button push
combination.
For example, in the LEVEL Setup screen, holding the
MENU/SEL button and pressing the UP arrow will copy
the value set on receiver 1 to receiver 2 . Pressing the
DOWN button will copy the value set on receiver 2 to
receiver 1.
+05 00 00
LEVEL LEVEL
00
Hold MENU and
press UP arrow
NOTE: It does not matter which receiver is
selected (highlighted).
Locking and Unlocking the
Front Panel Controls
The front panel controls can be LOCKED to prevent
accidental changes being made during operation and
handling.
Note: Whether locked or unlocked, the setting
persists when the unit is off and even when the
power is turned off.
From the Main Window, press and hold the UP and
DOWN arrows at the same time and observe the
display. The current state is displayed as LOCKED or
UNLOCKED, and numerals appear as a 3, 2, 1 count-
down takes place. When the countdown is complete the
state is reversed and the new state is displayed.
LCD Backlight Setup
Hold the UP arrow and turn on the power. The unit will
boot up then display the Backlight Options screen. Use
the UP and DOWN arrows to select the desired back-
light operating mode.
DOWN
DOWN
ON
BKLIGHT
30 SEC
BKLIGHT
OFF
BKLIGHT
UP
UP
DOWN
5 MIN
BKLIGHT
UP
Remains on
Dims after 30 seconds
Dims after 5 minutes
Backlight turns OFF
and Remains OFF

UHF Digital Hybrid Wireless®
Rio Rancho, NM 19
Spectrum scanning with the receiver itself is the best
way to find clear operating frequencies, since it will
reveal all RF signals present in the receiver, including
those generated by IM (intermodulation).
First, turn off all of the transmitters you intend to use
with the receiver.
Navigate to the SETUP/SCAN screen and press the
MENU/SEL button to start the scanner. The display will
switch to the Scan Window (see illustration above) and
start scanning immediately. Allow the receiver to scan
across the entire tuning range at least once, then press
the MENU/SEL button to stop the scanning.
Scroll through the screen with the UP and DOWN but-
tons and find a frequency where no RF signals (or in
the worst case, only very weak RF signals) are present.
Press the PWR/BACK button to set the receiver to this
new frequency.
Press both the UP and DOWN buttons at the same
time to switch to the Zoom View Window (see illustra-
tion above). In this view, the cursor remains fixed in the
center of the screen and the background scrolls behind
it. The frequency can be stepped up and down in 100
kHz increments using the UP and DOWN arrow buttons.
When the receiver is configured for SWITCHED diver-
sity (dual channel mode), two cursors will appear when
the scanning is stopped. Press MENU/SEL to toggle
between the two receivers. The cursor for the selected
receiver will be a dashed rather than solid line. Select
Scanning for Clear Frequencies
each receiver and use the UP and DOWN buttons to
locate a frequency with no (or very weak) RF activity.
Keep the frequencies of the two receivers at least 700
kHz apart to minimize de-sensing (short range) issues.
This spacing is a “worst case” approximation assum-
ing the transmitters are about 25 feet from the receiver
antennas.
Data gathered during a scan is stored until it is inten-
tionally 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 clear the scan memory and screens, press the back
button several times to return to the Main Window, then
press and hold the PWR/BACK button briefly. As soon
as Powering off... appears on the display, release the
button. The receiver will remain turned on, and the scan
data will be erased.
Set your transmitter to the same frequency as shown on
the receiver display, turn the transmitter on and verify
that a strong RF signal is present.
It is always good practice to go through the Multi-chan-
nel Checkout Procedure detailed on page 22.
Scan Window
RF Signal
indicators
Legacy
Transmitter
Switch Settings
Cursor (center bar)
SCROLL
reminders
Zoom View Window
Legacy Transmitter Switch
Settings for the currently
tuned frequency.
Dashed line (cursor)
shows the currently
selected receiver.
RF activity level.
70
1
Previously tuned
frequency
B3
Press both UP and
DOWN arrows on
control panel to switch
to the Zoom View
Press the BACK
button to return
to the Scan View
Window

SRb5P and SRb Dual Receivers
LECTROSONICS, INC.
20
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 ac-
complish this include:
• Using the pre-coordinated frequency groups
• Performing a system checkout
(See Multi-channel System Checkout)
• Contacting Lectrosonics for assistance
Groupings of compatible frequencies have been cre-
ated to minimize intermodulation problems in multiple
channel wireless systems. The frequencies can be used
with Digital Hybrid and analog Lectrosonics wireless
equipment. Compatibility with other brands is likely, but
not guaranteed by Lectrosonics.
These frequencies have been calculated to minimize IM
between these frequencies only. RF signals from out-
side sources can still interfere with operation, so even if
only these pre-coordinated frequencies are being used,
a Multi-channel System Checkout is still necessary. See
the procedure on the next page.
Pre-coordinated frequencies
are arranged in four groups as
shown at right.
The uppermost eight
frequencies comprise Grp
a, the eight just below them
comprise Grp b, and so on.
BLOCK 22
FREQ SW SET US TV CH
563.700 0,
5t
v29
564.300 0,
Bt
v29
565.200 1,
4t
v29
565.800 1,
At
v29
567.100 2,
7t
v30
568.000 3,
0t
v30
568.500 3,
5t
v30
569.300 3,
Dt
v30
575.700 7,
Dt
v31
577.900 9,
3t
v31
578.600 9,
At
v32
579.900 A,
7t
v32
581.700 B,
9t
v32
582.600 C,
2t
v32
585.200 D,
Ct
v33
587.500 F,
3t
v33
BLOCK 22
FREQ SW SETUS TV CH
570.100 4,
5t
v30
570.700 4,
Bt
v30
571.600 5,
4t
v30
572.200 5,
At
v31
573.200 6,
4t
v31
574.400 7,
0t
v31
574.900 7,
5t
v31
575.500 7,
Bt
v31
581.100 B,
3t
v32
582.100 B,
Dt
v32
582.600 C,
2t
v32
584.300 D,
3t
v32
585.000 D,
At
v32
585.600 E,
0t
v32
586.300 E,
7t
v32
588.100 F,9 tv32
Grp a
Displayed as “GROUP a” through “GROUP d” in the LCD
and as “Grp a” through “Grp d” in VRpanel
Grp b
Grp c
Grp d
Compatibility follows the pattern illustrated in the dia-
gram at right.
Grp a and Grp b contain the 16 frequencies shown in
the table below (upper orange/white set).
Grp c and Grp d contain the 16 frequencies shown in
the table below (lower blue/white set).
NOTE: There is no assurance that frequencies
are compatible between the upper orange/white
set and the lower blue/white set. Combined use of
frequencies from both sets requires testing with
the procedures outlined in the following section
entitled Multi-channel System Checkout
These frequencies share RF spectrum with TV chan-
nels. TV station broadcast signals are much more
powerful than a wireless microphone transmitter, and
can easily mix with the signals from the wireless system
to produce a variety of interference problems. Even if
these pre-coordinated frequencies are being used, it is
always a good idea to go through the checkout proce-
dure on the following page.
Active TV station and other external signals can be
discovered by scanning with the receiver.
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,
5t
v43
621.900 4,Btv39 647.500 4,
Bt
v43
622.800 5,4tv39 648.400 5,
4t
v43
623.400 5,Atv39 649.000 5,
At
v43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,
0t
v44
626.100 7,5tv40 651.700 7,
5t
v44
626.700 7,Btv40652.300 7,
Bt
v44
632.300 B,3tv41657.900 B,
3t
v45
633.300 B,Dtv41658.900 B,
Dt
v45
633.800 C,2tv41659.400 C,
2t
v45
635.500 D,3tv41661.100 D,
3t
v45
636.200 D,A tv41661.800 D,
At
v45
636.800 E,0tv41 662.400 E,
0t
v46
637.500 E,7tv41 663.100 E,
7t
v46
639.300 F,9tv42 664.900 F,9 tv46
All 16 within the
same block are
compatible
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,
5t
v43
621.900 4,Btv39 647.500 4,
Bt
v43
622.800 5,4tv39 648.400 5,
4t
v43
623.400 5,Atv39 649.000 5,
At
v43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,
0t
v44
626.100 7,5tv40 651.700 7,
5t
v44
626.700 7,Btv40652.300 7,
Bt
v44
632.300 B,3tv41657.900 B,
3t
v45
633.300 B,Dtv41658.900 B,
Dt
v45
633.800 C,2tv41659.400 C,
2t
v45
635.500 D,3tv41661.100 D,
3t
v45
636.200 D,A tv41661.800 D,
At
v45
636.800 E,0tv41 662.400 E,
0t
v46
637.500 E,7tv41 663.100 E,
7t
v46
639.300 F,9tv42 664.900 F,9 tv46
BLOCK 24 BLOCK 25
FREQ SW SET US TV CH FREQ SW SET US TV CH
621.300 4,5tv39 646.900 4,
5t
v43
621.900 4,Btv39 647.500 4,
Bt
v43
622.800 5,4tv39 648.400 5,
4t
v43
623.400 5,Atv39 649.000 5,
At
v43
624.400 6,4tv39 650.000 6,4 tv43/44
625.600 7,0tv39 651.200 7,
0t
v44
626.100 7,5tv40 651.700 7,
5t
v44
626.700 7,Btv40652.300 7,
Bt
v44
632.300 B,3tv41657.900 B,
3t
v45
633.300 B,Dtv41658.900 B,
Dt
v45
633.800 C,2tv41659.400 C,
2t
v45
635.500 D,3tv41661.100 D,
3t
v45
636.200 D,A tv41661.800 D,
At
v45
636.800 E,0tv41 662.400 E,
0t
v46
637.500 E,7tv41 663.100 E,
7t
v46
639.300 F,9tv42 664.900 F,9 tv46
The upper eight are
compatible with the
lower eight in the
adjacent blocks.
The lower eight are
compatible with the
upper eight in the
adjacent blocks.