Lectrosonics R1a User Manual download pdf (Page 4)

R1a

LECTROSONICS, INC.

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.

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