Lectrosonics IFBT4/E01 User manual

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This guide is intended to assist with

initial setup and operation of your

Lectrosonics product.

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IFB Transmitter

IFBT4, IFBT4/E01, IFBT4/X

U.S. Patent 7,225,135

20 May 2021

LECTROSONICS, INC.2

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.

The operating frequency may be selected only in this mode.

XMIT Normal operating position. The operating frequency may not be

changed in this mode, though other settings may be changed, so long

as the unit isn’t “Locked.”

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.

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 Fre-

quency 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

www.lectrosonics.com 3

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 fre-

quency.

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 chan-

nels 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 ROL-

LOFF.

Pressing the MENU button selects the current menu item. Selecting EXIT navi-

gates back to the Main window. Selecting any other item navigates to the associ-

ated 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.

LECTROSONICS, INC.4

COMPAT Setup Screen

The COMPAT setup screen selects the current compatibil-

ity mode, for interoperation with various types of receivers.

The available modes are:

US:

Nu Hybrid - This mode offers the best audio quality and is recommended if

your receiver supports it.

IFB - Lectrosonics IFB compatibility mode. This is the default setting and is

the appropriate setting to use with a compatible IFB receiver.

MODE 3 - Compatible with certain non-Lectrosonics receivers. (Contact fac-

tory for more information.)

Press MENU to return to the Setup window.

NOTE: If your Lectrosonics receiver does not have Nu Hybrid mode,

use Euro Digital Hybrid Wireless® (EU Dig. Hybrid).

E/01:

IFB - Lectrosonics IFB compatibility mode. This is the

default setting and is the appropriate setting to use

with the Lectrosonics IFBR1A or a compatible IFB

receiver.

400 - Lectrosonics 400 Series. This mode offers the best audio quality and is

recommended if your receiver supports it.

IFB - Lectrosonics IFB compatibility mode. This is the default setting and is

the appropriate setting to use with the Lectrosonics IFBR1A or a com-

patible IFB receiver.

400 - Lectrosonics 400 Series. This mode offers the best audio quality and is

recommended if your receiver supports it.

100 - Lectrosonics 100 Series compatibility mode.

200 - Lectrosonics 200 Series compatibility mode.

MODE 3 and MODE 6 - Compatible with certain

non-Lectrosonics receivers.

TUNING Setup Screen

The TUNING setup screen allows selection of one of four factory set frequen-

cy groups (Groups A through D), two user programmable frequency groups

(Groups U and V) or the choice to not use groups at all.

In the four factory set frequency groups, eight frequencies per group are

preselected. These frequencies are chosen to be free of intermodulation

products. (Refer to owner’s manual for more information).

www.lectrosonics.com 5

IFBT4 Menu Diagram

Press UP or DOWN arrow Display External Power Voltage

(added feature with firmware Ver. 1.4)

From the Main Window, press and hold the MENU

button until a progress bar appears (about 4 seconds).

Lock/Unlock Panel Buttons

Continue holding the button until the bar reaches the

right side of the LCD. The selected mode will flash briefly.

In the two user programmable frequency groups, up to 16 frequencies can be

programmed per group.

Note: The TUNING Setup Screen only selects the tuning mode

(NORMAL or Group tuning) and not the operating frequency. Actual

operating frequencies are chosen through the Frequency Window.

Press MENU to return to the Setup window.

Lock/Unlock Panel Buttons

To enable or disable the control panel buttons, navigate to the Main Window

and press and hold the MENU button for about 4 seconds. Continue holding

the button as a progress bar extends across the LCD.

When the bar reaches the right side of the screen, the unit will toggle to the

opposite mode and LOCKED or UNLOCKED will ﬂash brieﬂy on the screen.

LECTROSONICS, INC.6

Frequency Window Behavior, based on TUNING mode selections

If NORMAL tuning mode is selected, the Up and Down buttons select the op-

erating frequency in single channel (100 kHz) increments and the MENU+Up

and MENU+Down shortcuts tune in 16 channel (1.6 MHz) increments.

There are two classes of group tuning: factory preset groups (Grp A through

D) and user programmable frequency groups (Grp U and V).

In any of the group modes, a lower case a, b, c, d, u or v will be displayed to

the immediate left of the transmitter switch settings in the Frequency window.

The letter identiﬁes the selected factory or user tuning group. If the currently

tuned frequency is not in the current group, this group identiﬁcation letter will

blink.

User Programmable Frequency Group Behavior

The user programmable frequency groups “u” or “u” work very similarly to the

factory groups with a few exceptions. The most obvious difference is the ability

to add or remove frequencies from the group. Less obvious is the behavior of a

user programmable frequency group with only one entry, or with no entries.

A user programmable frequency group with only one entry continues to display

the single frequency stored in the group no matter how many times the Up or

Down buttons are pressed (provided the MENU button is not pressed at the

same time). The “u” or “v” will not blink.

A user programmable frequency group with no entries reverts to non-group-

mode behavior, i.e., access is allowed to all 256 available frequencies in the

selected receiver module’s frequency block. When there are no entries, the “u”

or “v” will blink.

Adding/Deleting User Programmable Frequency Group Entries

Note: Each User Programmable Frequency Group (“u” or “v”) has

separate contents. We recommend that you consider the larger issue of

frequency coordination prior to adding frequencies in order to minimize

potential intermodulation problems.

1. Start from the Frequency window and verify that a lower case “u” or “v” is

present next to the transmitter switch settings.

2. While pressing and holding the MENU button press either the Up or

Down button to move to one of the 256 available frequencies in the

block.

3. To add or remove the displayed frequency from the group, hold down the

MENU button while pressing and holding the Up button. The group tun-

ing mode indicator will stop blinking to show that the frequency has been

added to the group, or begin blinking to indicate that the frequency has

been removed from the group.

www.lectrosonics.com 7

Rear Panel Controls and Functions

IFBT4 Rear Panel

XLR Jack

A standard XLR female jack accepts a variety of input sources depending on the

setting of the rear panel MODE switches. XLR pin functions can be changed to

suit the source depending on the positions of the individual switches. For detailed

information on the setting of these switches see the owner’s manual.

MODE Switches

The MODE switches

allow the IFBT4 to ac-

commodate a variety

of input source levels

by changing the input

sensitivity and the pin

functions of the input

XLR jack. Marked on

the rear panel are the

most common settings.

Each setting is detailed

in the chart. Switches

1 and 2 adjust the XLR

pin functions while

switches 3 and 4 adjust

the input sensitivity.

Power Input Connector

The IFBT4 is designed to be used with the DCR12/A5U external (or equiva-

lent) power source. The nominal voltage to operate the unit is 12 VDC,

although it will operate at voltages as low as 6 VDC and as high as 18 VDC.

External power sources must be able to supply 200 mA continuously.

Antenna

The ANTENNA connector is a standard 50 ohm BNC connector for use with

standard coaxial cabling and remote antennas.

Switch

Positions Input

Name 1 2 3 4 XLR Pins Balanced Sensitivity

CC qqqp 3 = Audio No -10 dBu

1 = Common

MIC pppq 2 = Hi Yes -42 dBu

3 = Lo

1 = Common

LINE ppqq 2 = Hi Yes 0 dBu

3 = Lo

1 = Common

RTS1 pqqq 2 = Hi No 0 dBu

1 = Common

RTS2 qqqq 3 = Hi No 0 dBu

1 = Common

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