General Technical Description; Features; Control Knob; Led Indicator - Lectrosonics IFBR1a-VHF Instruction Manual

IFBR1a-VHF

General Technical Description

The IFBR1 was upgraded to the IFBR1a-VHF receiver
by adding a number of important and useful features:
(1) Two rotary HEX switches to manually set the operat-
ing 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 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.
The IFBR1a-VHF receiver
includes a leather pouch with belt
clip to help protect the receiver
and provide a way to secure it
during use.
The Pilot Tone squelch locks the reception to the match-
ing transmitter and ignores other signals to keep the
receiver quiet when the transmitter is turned off.
The receiver operates 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
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 rotating battery
compartment door.
4
When powered ON,
the receiver will de-
fault to the frequency
set by the switches.
A nonvolatile mem-
ory can store up to
five additional fre-
quencies accessible
by pressing the knob.
The memory remains
during power OFF
and even with the
battery removed.
The IFBR1a-VHF
receiver uses 20
kHz FM deviation
for efficient use of
the bandwidth and a
single band compan-
dor for clean quiet
audio.
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
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.
Figure 1 - R1a Control Panel
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.
LECTROSONICS, INC.