Lectrosonics R1a - Manual (Page 4)

R1a
LECTROSONICS, INC. 4
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 multi-
color 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. Microproces-
sor control of frequencies within each frequency block
provides the ability to work around interference prob-
lems 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 com-
pandor for clean quiet audio.
The Pilot Tone squelch locks
the reception to the
matching trans-
mitter and ignores
other signals to
keep the receiver
quiet when the
transmitter is
turned off.
The receiver oper-
ates on one 9 Volt
alkaline or LiPoly-
mer rechargeable
battery for up
to 8 hours and
features a tricolor
LED low battery
indicator. The
voltages are inter-
nally regulated for
stability.
General Technical Description
Figure 1 - R1a Control Panel
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, light-
weight 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.
LED Indicator (fig. 1)
The three color LED indicator on the front panel pro-
vides 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 fre-
quency 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 program-
ming 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.