Lectrosonics IFBT4E Users Manual

Quick Start Guide

IFBT4

IFB Transmitter

U.S. Patent 7,225,135

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Serial Number:

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This guide is intended to assist with
initial setup and operation of your
Lectrosonics product.

For a detailed user manual, down­load the most current
version at:

www.lectrosonics.com/manuals

9feb09

Front Panel Controls and Functions

IFBT4 Front Panel

OFF/TUNE/XMIT Switch

OFF Turns the unit off.

TUNE Allows all functions of the transmitter to be set up, without transmitting.

XMIT Normal operating position. The operating frequency may not be

Power Up Sequence

When power is first turned on, the front panel LCD display steps through the
following sequence.

1. Displays Model and frequency block number (e.g. IFBT4 BLK 25).

2. Displays installed firmware version number (e.g. VERSION 1.0).

3. Displays the current compatibility mode setting (e.g. COMPAT IFB).

4. Displays the Main Window.

The operating frequency may be selected only in this mode.

changed in this mode, though other settings may be changed, so long
as the unit isn’t “Locked.”

Main Window

The Main window is dominated by an audio level meter,
which displays the current audio modulation level in real
time. In TUNE mode, a blinking capital “T” is displayed in
the lower left corner to remind the user that the unit is not yet transmitting. In
XMIT mode, the blinking “T” is replaced by an antenna icon.

Audio limiting is indicated when the audio bargraph extends all the way to the
right and widens somewhat. Clipping is indicated when the zero in the lower
right corner changes to a capital “C”.

The Up and Down buttons are disabled in this Window.

Frequency Window

Pressing the MENU button once from the Main window
navigates to the Frequency window. The Frequency window
displays the current operating frequency in MHz, as well as
the standard Lectrosonics hex code for use with transmitters equipped with hex

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switches. Also displayed is the UHF television channel to which the selected
frequency belongs.

In XMIT mode, it is not possible to change the operating frequency.

In TUNE mode, the Up and Down buttons may be used to select a new fre­quency.

If the TUNING mode is set to NORMAL, the Up and Down buttons navigate in
single channel increments, and MENU+Up and MENU+Down move 16 chan­nels at a time. In any of the various group tuning modes, the currently selected
group identifier is displayed to the left of the hex code, and the Up and Down
buttons navigate among the frequencies in the group. In factory group tuning
modes A thru D, MENU+Up and MENU+Down jump to the highest and lowest
frequencies in the group. In user group tuning modes U and V, MENU+Up and
MENU+Down permit access to frequencies not currently in the group.

Pressing and holding the Up or Down button invokes an autorepeat function, for
faster tuning.

Audio Input Gain Window

Pressing the MENU button once from the Frequency window
navigates to the Audio Input Gain window. This window
greatly resembles the Main window, with the exception that
the current audio input gain setting is displayed in the upper left corner. The Up
and Down buttons may be used to alter the setting while reading the realtime
audio meter to determine what setting works best.

The gain range is -18 dB to +24 dB with 0 dB as nominal. The reference for this
control can be changed with the rear panel MODE switches. See page 7 for
more information on the MODE switches.

Setup Window

Pressing the MENU button once from the Audio Input
Gain window navigates to the Setup window. This window
contains a menu which permits access to various setup
screens.

Initially the active menu item is EXIT. Pressing the Up and Down keys permits
navigation among the remaining menu items: TUNING, COMPAT and ROLL­OFF.

Pressing the MENU button selects the current menu item. Selecting EXIT navi­gates back to the Main window. Selecting any other item navigates to the associ­ated setup screen.

ROLLOFF Setup Screen

The ROLLOFF setup screen controls the low frequency
audio response of the IFBT4. The 50 Hz setting is the
default, and should be used whenever wind noise, HVAC
rumble, traffic noise or other low frequency sounds may degrade the quality of
the audio. The 35 Hz setting may be used in the absence of adverse condi­tions, for a fuller bass response.

Press MENU to return to the Setup window.

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