INSTRUCTION MANUAL
IFBR1B
UHF Multi-Frequency Belt-Pack IFB Receiver
IFBR1B, IFBR1B-941, IFBR1B-VHF
IFBR1B-VHF
IFBR1B-941
IFBR1B
NOTE: The IFBR1B does not ship standard
with the single battery charger. To order this
unit with a charger, order as IFBR1B-WITHCHARGER.
Fill in for your records:
Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
IFBR1B, IFBR1B-941, IFBR1B-VHF
Table of Contents
Introduction ............................................................................3
General Technical Description .............................................3
Frequency Agility..................................................................3
Frequency Presets ...............................................................3
Simplicity ..............................................................................3
IFBR1B Features ....................................................................4
On/Off and Volume Knob .....................................................4
Battery Status LED ..............................................................4
RF Link LED .........................................................................4
USB Port ..............................................................................4
Installing the Battery .............................................................4
Battery Charging ...................................................................4
IFBR1B Functions ...............................................................5
Frequency Selection ............................................................5
Preset Selection ...................................................................5
Clear a Preset Selection ......................................................5
Firmware Update Instructions ..............................................6
Backlight Settings ................................................................6
LED On/Off ..........................................................................6
Locale Menu ........................................................................6
Locking the Settings .............................................................6
Specifications and Features .................................................7
Specifications .......................................................................7
Parts and Accessories ..........................................................8
Troubleshooting .....................................................................10
Service and Repair ................................................................11
Returning Units for Repair ...................................................1
2
LECTROSONICS, INC.
IFB Receiver
Introduction
Wireless IFB (interruptible fold back) systems are used
for talent cueing and crew communications in broadcast
and motion picture production. In other cases, the IFB
system is used by directors and other management
to monitor program audio during a production. The
IFBR1B receiver provides simplicity and flexibility in a
package that is intuitive for untrained users to operate.
In spite of its tiny size, the new IFBR1B receiver offers
excellent performance on par with all of Lectrosonics’
IFB products.
The design uses +/-20 kHz FM deviation for efficient
use of the bandwidth, with compandor noise reduction circuitry for an excellent signal to noise ratio. A
supersonic Pilot Tone signal controls the audio output
squelch to keep the receiver silent when no transmitter signal is received. The incoming RF signal is filtered
and amplified, then mixed down to the IF frequency with
a microprocessor controlled synthesizer.
If a monaural earpiece is connected, this condition is
automatically accommodated, with no loss of audio output power or battery life. Full output power is available
with either type of connector, without the power losses
that result from a resistive circuit design. The headphone cable doubles as the receiving antenna.
The receiver will drive a wide variety of earbuds, headphones and induction neck loops at substantial levels,
with loads from 16 Ohms to 600 Ohms.
The IFBR1B operates on a single 3.6 V rechargeable
LB-50 Li-ion battery that will provide about eight hours
of operation per charge. The LED indicator changes
color from green to red as the battery voltage declines
to provide plenty of warning before operation ceases.
Inside the battery door is a USB port for firmware updates in the field.
The IFBR1B is housed in a rugged machined aluminum
package. A wire belt clip is included and provides a
secure mounting on a wide variety of belts, pockets and
fabrics.
General Technical
Description
Frequency Agility
The frequency agile IFBR1B Receiver is designed to
operate with the Lectrosonics IFB transmitters and
compatible Digital Hybrid transmitters. Microprocessor
control of frequencies within each frequency block provides the ability to work around interference problems
quickly and simply.
Frequency Presets
There are 10 presets available for programming in the
IFBR1B. The stored frequencies remain in memory during power OFF and even with the battery removed. Use
the UP and DOWN arrows to scroll through the previously selected frequencies stored in the IFBR1B and
quickly change frequencies for quick communication.
Simplicity
The unique design in this receiver is not only tiny, but
provides simple one knob operation for on/off and audio
level and easy on-the-fly programming with simple frequency adjustments and 10 preset slots available. Basic
operation is simply a matter of rotating the knob to turn
power on and adjust the volume level.
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IFBR1B, IFBR1B-941, IFBR1B-VHF
IFBR1B Features
Headphone
output
LINK LED
On/Off and Volume Knob
Turns unit on or off and controls headphone audio level.
When the IFBR1B is first turned on, the firmware version will display briefly.
On/Off and
volume knob
Battery status
LED
Installing the Battery
USB port
An attached latching door makes battery installation easy.
The USB port is located in the battery compartment.
The battery door was designed to latch, providing extra
security. To open, press at the lower right corner as
shown.
Battery Status LED
When the battery status LED glows green, the batteries
are good. The color changes to red at a midpoint during
the runtime. When the LED begins to blink red, only a
few minutes remain.
The exact point at which the LED turns red will vary with
battery brand and condition, temperature and power
consumption. The LED is intended to simply catch your
attention, not to be an exact indicator of remaining time.
NOTE: The LCD will also alert when the battery is
critically low.
RF Link LED
When a valid RF signal from a transmitter is received,
this LED will light up blue.
Headphone Output
A 3.5 mm mini phone jack accommodates a standard
mono or stereo type 3.5 mm plug. The unit will drive
low or high impedance earphones. The jack is also the
receiver antenna input with the earphone cord acting as
the antenna. The cord length is not critical but must be
at least 6 inches minimum.
Slide the battery compartment door open, drop the
battery in so that the connectors match and slide the
battery door closed.
The battery door will now “lock” when fully closed. To
“unlock,” press down actuator and slide battery door
open.
Battery Charging
The receiver operates on a 3.6 V rechargeable battery that will provide about eight hours of operation per
charge.
CAUTION: Use only Lectrosonics LB-50
supplied battery (P/N 40106-1).
USB Port
Firmware updates via Wireless Designer are made
easy with the USB port in the battery compartment.
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LECTROSONICS, INC.
The optional battery charger kit provides a USB terminating plug (standard and microUSB) on the charger.
The LED glows red during charging and turns green
when the battery is fully charged.
Battery charger kit
P/N 40117
CAUTION: Use only Lectrosonics
batterychargers; P/N 40117 (as shown) or
CHSIFBRIB.
IFBR1B Functions
Frequency Selection
Press the FREQ button to select receiver frequency.
Frequency is shown in MHz. The UP and DOWN arrow
buttons adjust the frequency in 25 0r 100 kHz steps
(VHF: 125 kHz steps). Simultaneous press of FREQ +
UP or FREQ + DOWN adjusts the frequency in 1 MHz
steps.
NOTE: Holding down the UP or DOWN arrow
button, as opposed to a quick press, will scroll
through the frequency steps at an accelerated
pace.
Preset Selection
Press the PRESET button to select preset frequencies
for future use. Presets are displayed as:
P on the left and the current preset number (1-10) on
the right OR
IFB Receiver
If the current preset slot is empty, an E also appears
on the right. Use the UP and DOWN arrow buttons to
navigate among any programmed presets, tuning the
receiver to each.
NOTE: If the preset number is blinking, the
receiver IS NOT currently tuned to that preset.
There are two options available for setting presets:
Choosing the preset slot first:
1. Press PRESET to display the preset menu.
2. Use PRESET + UP and PRESET + DOWN to
choose the desired slot. When navigating among
the preset slots in this way, all slots are accessible,
even the empty ones, and the receiver’s tuning is
not affected.
3. If the desired preset slot is occupied, you can reprogram by pressing PRESET + DOWN to clear the
slot.
4. Press FREQ to display the frequency, then use the
UP and DOWN arrow buttons adjust the frequency
in 25 kHz steps.
5. Press PRESET again to return to the presets menu.
You should see an E next to the blinking preset
number.
6. Press and hold PRESET + UP to program the preset. The E will disappear and the preset number will
stop blinking, indicating that this slot has now been
programmed with the current frequency.
Choosing the frequency first:
1. Press FREQ to display the frequency, then use the
UP and DOWN arrow buttons adjust the frequency
in 25 kHz steps.
2. Press PRESET to display the preset menu.
3. Use PRESET + UP and PRESET + DOWN to choose
the desired slot. When navigating among the preset
slots in this way, all slots are accessible, even the
empty ones, and the receiver’s tuning is not affected.
4. If the desired preset slot is occupied, you can reprogram by pressing PRESET + DOWN to clear the
slot.
5. Press and hold PRESET + UP to program the preset. The E will disappear and the preset number will
stop blinking, indicating that this slot has now been
programmed with the current frequency.
Clear a Preset Selection
1. Press PRESET to display the preset menu.
2. Press either UP or DOWN arrow buttons (tuning
as you scroll) or PRESET + UP and PRESET +
DOWN (selecting the preset without tuning) to select the preset number you wish to clear.
Rio Rancho, NM
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IFBR1B, IFBR1B-941, IFBR1B-VHF
NOTE: If there is an E next to the preset number,
the slot is already clear.
3. Press and hold PRESET + DOWN to clear the slot.
The E will appear and the preset number will blink,
indicating the slot is now empty.
Backlight Settings
Press the UP arrow button while powering on the
receiver to display the backlight time out menu. Use
the UP and DOWN arrow buttons to scroll through the
options:
bL: Backlight always on; default setting
bL 30: Backlight times out after 30 seconds
bL 5: Backlight times out after 5 seconds
Press the FREQ button to exit and save settings.
LED On/Off
Press the UP arrow button while powering on the
receiver. From the backlight time out menu, press the
FREQ button to access the LED on/off menu. Use the
UP and DOWN arrow buttons to scroll through the op-
tions.
Press the FREQ button to exit and save settings.
Firmware Update
Instructions
Use the Lectrosonics wireless Designer program to
install firmware updates. Firmware update files and
change notes are available from the Lectrosonics website.
Remove the battery and connect the IFBR1B to your
Windows or macOS computer with a USB cable. The
cable must have a micro-B male connector to mate with
the USB jack in the IFBR1B. When updating firmware,
the IFBR1B is powered by the USB cable. Use the
“Firmware Update” Wizard in Wireless Designer to open
the firmware file and install the new firmware version.
Locale Menu
On block 941 receivers ONLY, from the LED On/Off
menu, press the FREQ button to access the LOCALE
menu. Use the UP and DOWN arrow buttons to scroll
through the options:
LC CA: Use with SMV/E07-941, SMQV/E07-941, HMA/
E07-941, HHA/E07-941, SMWB/E07-941 and SMDWB/
E07-941
LC --: Use with all other Block 941 transmitters
Press the FREQ button to exit and save settings.
Locking the Settings
To lock or unlock the IFBR1B settings, press and hold
the UP and DOWN arrow buttons simultaneously until
the countdown completes.
There are two options available for locked settings:
Locking Frequency: If frequency is displayed when
the receiver is locked, the frequency remains displayed,
and the UP or DOWN arrow buttons will not alter the
frequency.
Locking Preset: If preset is displayed when the receiver is locked, preset remains displayed, and the UP
or DOWN arrow buttons can be used to scroll through
previously programmed presets; however, the presets
may not be programmed or deleted.
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LECTROSONICS, INC.
Specifications and Features
Specifications
Operating Frequencies (MHz):
Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175
Block 941: Local -- Local CA
941.525 - 951.975 941.525 -951.975
952.875 - 956.225 953.025 - 956.225
956.475 - 959.825 956.475 - 959.825
VHF: 174.100 - 215.750
NOTE: It’s the user’s responsibility to select the approved
frequencies for the region where the transmitter is
operating.
Frequency Selection Steps: 25 kHz or 100 kHz, selectable; VHF: 175 kHz
Sensitivity: 1 uv (20 dB SINAD)
Signal/Noise ratio: 95 dB A-weighted
Squelch quieting: 90 dB
AM rejection: 50 dB, 10 uV to 100 mV
Modulation acceptance: ±20 kHz
Spurious rejection: Greater than 70 dB
Operating temperature range: -20 to 45 degrees C.
Third order intercept: 0 dBm
Frequency response: 100 Hz to 10 kHz, (+/-1 dB)
Audio output: 1V RMS into 50 ohms minimum
Antenna: Headphone cable
Min. headphone impedance: 16.0 Ohms
Programmable memory: 10 frequencies can be stored as presets
Controls:
Top Panel: Single knob controls Audio Output Level and Power On
Side Panel: Membrane switches with LCD interface for Frequency
Selection and Preset function
Indicators: Multi-color LED indicator for power on and battery
status
Battery: LB-50 Li-ion 3.6 V 1000 mAH
Battery Life: 8 hours per charge with LB-50 Li-ion battery
Current consumption: 120 mA
Weight: 3.4 oz (with battery and wire belt clip)
Size: 2.8 x 2.4 x 0.8 in.
71.1 x 70.0 x 20.3 mm
IFB Receiver
Specifications subject to change without notice.
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IFBR1B, IFBR1B-941, IFBR1B-VHF
Supplied Parts and Accessories
27258
Wire belt clip.
40106-1
LB-50. 3.6V lithium-ion battery pack
VSR-1
Self-adhesive Velcro strip. Helps to alleviate cord stress
at the jack.
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LECTROSONICS, INC.
Optional Parts and Accessories
IFB Receiver
40117
USB-powered IFBR1B Receiver battery charging station; charges two batteries at once.
CHSIFBR1B
Ideal for large studio or performance installations.
A convenient and organized means of recharging 4
LB-50 batteries and IFBR1B receivers with numerous
batteries in regular use. Each charging module may be
daisy-chained to 3 additional modules using a single
AC-DC power supply for a total of 16 units charging at
once (LB50s and/or IFBR1Bs). Requires DCR5/9AU
power supply.
IFBR1BBCSL
Spring loaded beltclip for IFBR1B
DCR5/9AU
Power supply for the CHSIFBR1B. Includes AC cord.
Can power up to 4 CHSIFBR1Bs at once.
Rio Rancho, NM
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IFBR1B, IFBR1B-941, IFBR1B-VHF
Troubleshooting
Symptom
LED NOT LIT • Battery not installed or depleted.
• Power not turned on.
NO SOUND IN HEADPHONE • AUDIO LEVEL turned all the way down.
• Headphone plug not inserted fully.
• Defective headphone or connector
• Transmitter not operating. (See separate transmitter manual.)
• Receiver not on the same frequency as the transmitter.
DISTORTED SOUND • Transmitter gain (audio level) is far too high. Refer to the operating
• Receiver output may be mismatched with the headset or
HISS AND NOISE, AUDIBLE DROPOUTS • Transmitter gain far too low.
• Receiver antenna missing or obstructed.
• Transmitter antenna missing or obstructed.
• Operating range too great.
• Transmitter antenna obstructed. Move transmitter antenna and/or
• Receiver antenna (headset cord) may need to be repositioned for a
Possible Cause
See page 5.
instructions section in the transmitter manual for details on gain
adjustment.
earphone. Adjust audio level on receiver to the correct level
for the headset or earphone.
(Headphone cable is the antenna.)
receiver to a position with a line of sight between the transmitter
antenna and the receiver.
line of sight to transmitter antenna
SHORT RANGE • Receiver headphone cable is also the antenna. Make sure the cable
is not coiled or wound up or wrapped around the receiver case.
DECIMAL POINT IS BLINKING ON FREQUENCY
• It is normal to see the decimal point blink briefly when making large
changes to frequency, as when wrapping around the band edges.
• Can also mean the receiver is currently tuned to an invalid
frequency.
• Otherwise, a blinking decimal point is a sign that something is
wrong with the hardware.
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LECTROSONICS, INC.
IFB Receiver
Service and Repair
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting
cables and then go through the Troubleshooting section in this manual.
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection,
send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set at the
factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are
no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest
flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does
to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone
for out-of-warranty repairs.
Returning Units for Repair
For timely service, please follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by e-mail or by phone. We need
to know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed
your repair through our receiving and repair departments. The return authorization number must be clearly shown
on the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for
safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-
age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Lectrosonics USA:
Mailing address: Shipping address: Telephone:
Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501
PO Box 15900 586 Laser Rd NE, Suite 102 (800) 821-1121 Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax
USA USA
Web: E-mail:
www.lectrosonics.com sales@lectrosonics.com
Lectrosonics Canada:
Mailing Address: Telephone: E-mail:
720 Spadina Avenue, (416) 596-2202 Sales: colinb@lectrosonics.com
Suite 600 (877) 753-2876 Toll-free Service: joeb@lectrosonics.com
Toronto, Ontario M5S 2T9 (877-7LECTRO)
(416) 596-6648 Fax
Rio Rancho, NM
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LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
+1(505) 892-4501 • fax +1(505) 892-6243 • (800) 821-1121 US and Canada • sales@lectrosonics.com
9 July 2021
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