Lectrosonics R1 - Manual (Page 4)

GENERAL TECHNICAL DESCRIPTION
The IFB R1 Receiver is comprised of a number of functional subsystems as shown in Fig 1, Control Panel and Fig 2,
Receiver Block Diagram.
GENERAL FEATURES
The frequency agile IFB R1 FM Receiver is designed to operate with the Lectrosonics IFB T1 Transmitter and features
microprocessor control of 256 frequencies of operation within each frequency block. Each block covers 25.5 MHz with
0.1 MHz frequency spacing. Any one of ten different frequency blocks are factory available from 512 MHz to 805.5
MHz (except 608 to 614 MHz).
The receiver’s unique microcontroller design provides simple one knob and one LED operation for audio level, switch­
ing channels, and easy on-the-fly programming. A nonvolatile memory “remembers” all stored channels during power
OFF and returns operation to the last channel used when powered ON.
The IFB R1 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 mating IFB T1 Transmitter and ignores other signals.
The receiver operates on one 9 Volt alkaline battery for up to 8 hours and features a blinking LED low battery indicator.
The voltages are internally regulated for stability.
The receiver is housed in a compact, rugged, lightweight aluminum enclosure. The unit features a durable removable
belt clip and an integral swing-aside battery compartment door.
CONTROL KNOB (fig. 1)
The single front panel control knob performs multiple functions;
1. Rotate for Power ON/OFF 3. Push quick, Channel Switching
2. Rotate for Audio Level 4. Push and rotate for Scan and Channel programming,
LECTRO
AUDIO
LEVEL
SCAN
(PUSH)
OFF MAX
R1
IFB RECEIVER
Figure 1 - R1 Control Panel
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 LED indicator on the front panel also indicates 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 a steady ON LED indicates a good battery. When the battery is nearly
exhausted the LED will repetitively blink one long and two short blinks. Continued use will further deplete the battery
causing the unit to automatically turn itself OFF until a fresh battery is installed.
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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