IFB Receiver
GENERAL TECHNICAL DESCRIPTION
The IFB R5 Receiver is comprised of a number of functional subsystems as shown in Fig 1, Control Panel and Fig
3, Receiver Block Diagram.
GENERAL FEATURES
The frequency agile IFB R5 FM Receiver is designed to operate with the Lectrosonics IFB T5 Transmitter and
features microprocessor control of 256 frequencies of operation within each frequency block. Each block covers 25.5
MHz with 0.100 MHz frequency spacing. Up to 256 special frequencies and 0.025MHz spacing can be programmed
into a unit by the factory or by authorized service centers. Any one of thirteen different frequency blocks numbered
21 through 33 are factory available from 537.6 MHz to 865.0 MHz.
The receiver’s unique microcontroller design provides simple one knob and one LED operation for audio level,
switching 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 R5 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 T5 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 indica-
tor. 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
R5
IFB RECEIVER
Figure 1 - R5 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 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.
Rio Rancho, NM – USA
3
(12 pages)
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