Lectrosonics R1a User Manual
INSTRUCTION MANUAL
R1a
UHF Multi-Frequency Belt-Pack IFB Receiver
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Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
R1a
Safety Notes
Excessive sound levels can cause permanent hearing
damage.
1. Always adjust the volume to the lowest level before
listening to unknown transmissions.
2. Use the lowest reasonable level consistent with
hearing safety.
3. Don’t use high sound levels in the earphone to
overcome high ambient sound levels. That is
absolutely foolish! Demand and use high isolation
earphones.
4. Don’t expose your ears to sound levels that cause
them to ring. If your ears do ring after exposure,
think of it as a warning bell telling you not to do
that again.
OSHA (Occupational Safety Health Administration)
guidelines on the maximum allowable time exposure to
sound pressure levels that will cause hearing damage
are as follows:
8 hours at 90 dB SPL
4 hours at 95 dB SPL
2 hours at 100 db SPL
1 hour at 105 dB SPL
30 mins at 110 dB SPL
15 mins at 115 dB SPL
NEVER expose your ears to 120 dB SPL or higher!
Damage will occur.
Introduction
Thank you for selecting the Lectrosonics frequency
agile, R1a IFB receiver. The design is the result of
extensive engineering experience with the most up to
date components for demanding professional applications. The receiver will operate with any Lectrosonics
IFB Transmitter.
The Lectrosonics R1a receiver along with the companion T1 or T4 transmitter allow on-air talent to monitor
program audio, and to receive cues from directors and
other production personnel.
The housing is a rugged, machined aluminum package
designed to survive abusive environments
Only the R1a IFB receiver is covered in this manual.
Transmitters are covered in separate manuals.
The R1a will also work with later models of Digital Hybrid Wireless transmitters in the same frequency block.
Check with the factory regarding compatibility with the
firmware in your transmitter.
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IFB Receiver
Table of Contents
Safety Notes ............................................................................................................................................................................................2
Introduction .............................................................................................................................................................................................3
Table of Contents ...................................................................................................................................................................................3
General Technical Description ..............................................................................................................................................................4
Features ................................................................................................................................................................................................4
Control Knob (fig. 1) ..............................................................................................................................................................................4
LED Indicator (fig. 1) ............................................................................................................................................................................4
Headphone Jack (fig. 1 & fig. 2) ............................................................................................................................................................5
Mono Plug/Stereo Plug Usage ..............................................................................................................................................................5
Audio Level ...........................................................................................................................................................................................5
Frequency Adjust (fig.3) ........................................................................................................................................................................5
Receiver Normal Operation ..................................................................................................................................................................6
Add a New Frequency to The Next Open Channel ...............................................................................................................................6
Erase All 5 Channel Memories .............................................................................................................................................................7
Multiple Transmitter Setup .................................................................................................................................................................... 7
Battery Instructions................................................................................................................................................................................7
Troubleshooting ......................................................................................................................................................................................8
Replacement Parts and Accessories ....................................................................................................................................................9
Defeating the Frequency & Mode Switch .............................................................................................................................................. 8
Specifications and Features ................................................................................................................................................................10
UHF Transmitter Antenna Specifications ............................................................................................................................................10
Service and Repair ...............................................................................................................................................................................11
Returning Units for Repair ..................................................................................................................................................................11
Rio Rancho, NM
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R1a
General Technical Description
The IFBR1 was upgraded to the IFBR1a by adding a
number of important and useful features: (1) Two rotary
HEX switches to manually set the operating frequency,
(2) Automatic sensing/control of a mono phone plug
to eliminate the mono/binaural switch, and (3) A multicolor LED for battery status. The Frequency scan and
memory features were retained.
Features
The frequency agile IFB R1a FM 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 blocks 21 through
29 offer 256 frequencies each, in 100 kHz steps, with
the exception of 608 through 614 MHz in block 23.
Block 944 offers 79 frequencies from 944.100 through
951.900 MHz, also in 100 kHz steps.
The unique microcontroller design in this receiver
provides simple one knob and one LED operation for
audio level, switching frequencies (channels), and easy
on-the-fly programming. The receiver frequency can be
set by manually using the two rotary HEX switches on
the side of the unit or by using the automatic scan and
store function, or both.
When powered ON, the receiver will default to the
frequency set by the switches. A nonvolatile memory
can store up to five additional frequencies accessible by
pressing the knob. The memory remains during power
OFF and even with the battery removed.
The IFB R1a Receiver uses 20 kHz FM deviation for
efficient use of the bandwidth and a single band compandor for clean quiet audio.
The Pilot Tone squelch locks
the reception to the
matching transmitter and ignores
other signals to
keep the receiver
quiet when the
transmitter is
turned off.
The receiver operates on one 9 Volt
alkaline or LiPolymer rechargeable
battery for up
to 8 hours and
features a tricolor
LED low battery
indicator. The
voltages are internally regulated for
stability.
The R1a includes a leather pouch
with belt clip to help protect the
receiver and provide a way to
secure it during use.
The receiver is housed in a compact, rugged, lightweight aluminum enclosure. The unit features a durable
removable belt clip and an integral rotating battery
compartment door.
Control Knob (fig. 1)
The single front panel control knob performs multiple
functions;
1. Rotate for Power ON/OFF
2. Rotate for Audio Level
3. Push quick, Channel Switching. (Also see page 9
for special knob setup.)
4. Push and rotate for Scan and
Channel programming,
Refer to the RECEIVER OPERATING INSTRUCTIONS
for full details on how to use the single knob control for
channel selection, scanning, and programming of the
five memory locations.
Figure 1 - R1a Control Panel
LED Indicator (fig. 1)
The three color LED indicator on the front panel provides multiple functions.
CHANNEL NUMBER - The LED will blink OFF a
number of times corresponding to the Channel Number
when the unit is switched ON and also when a new frequency is added to an open channel. For example, for
channel 3 the LED would blink OFF three times. After
blinking the channel number the LED will return to a
steady ON indicating normal operation.
BATTERY STATUS – During normal operation, when
the LED is GREEN, the battery is good. When the LED
is YELLOW the battery is getting low. When the LED
is RED, the battery is nearly depleted and should be
replaced.
PROGRAMMING FUNCTIONS - In the programming mode, the LED will blink at a fast rate to indicate
scanning for an active frequency. It also flashes briefly
to indicate a frequency has been programmed into a
channel.
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