Lectrosonics R5a User Manual download pdf (Page 5)

IFB Receiver

General Technical Description

The IFBR5 was upgraded to the IFBR5a 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.

The IFB R5a 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 R5a 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 avail-

able from 512 MHz to 805.5 MHz (except 608 to 614

MHz).

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 R5a 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 tricolor LED low battery

indicator. The voltages are internally regulated for

stability.

The receiver is housed in a compact, rugged, light-

weight 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

2. Rotate for Audio Level

3. Push quick, Channel Switching

4. Push and rotate for Scan and Channel

programming,

AUDIO

LEVEL

SCAN

(PUSH)

OFF MAX

IFB RECEIVER

LECT RO

R5a

Figure 1 - R5a 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 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

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.

Rio Rancho, NM 5

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