Lectrosonics IFBT4/E01-VHF User manual

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Guide
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This guide is intended to assist with
initial setup and operation of your
Lectrosonics product.
For a detailed user manual, down-
load the most current
version at:
www.lectrosonics.com
Digital Hybrid Wireless®
US Patent 7,225,135
IFBT4-VHF Transmitter
IFBT4-VHF, IFBT4/E01-VHF, IFBT4-VHF/X
25 July 2019

LECTROSONICS, INC.2
Front Panel Controls and Functions
IFBT4 VHF 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, as 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 number (e.g. IFBT4 VHF).
2. Displays installed firmware version number (e.g. V1.00).
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,
XMIT Mode
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
Audio Limiting
extends all the way to the right and widens some-
what.
The Up and Down buttons are disabled in this Win-
dow, but they will display voltage (e.g. 15.4 VOLTS).

www.lectrosonics.com 3
Frequency Window
When in TUNE mode, pressing the MENU button once 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 receivers
equipped with hex switches.
In TUNE mode, the Up and Down buttons may be used to select a new fre-
quency.
The Up and Down buttons navigate in 175 kHz increments. Holding the MENU
button+Up and MENU+Down move 2.8 MHz at a time.
Pressing and holding the Up or Down button invokes an autorepeat function, for
faster tuning.
In XMIT mode, it is not possible to change the operating frequency.
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 set the input level accurately.
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 6 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: 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 VHF. The 35 Hz setting is the default and may be used in the absence
of adverse conditions, for a fuller bass response. The 50 Hz setting should be
used whenever wind noise, HVAC rumble, traffic noise or other low frequency
sounds may degrade the quality of the audio. 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 the Lectrosonics IFBR1A or a com-
patible IFB receiver.
NOTE: If your Lectrosonics receiver does not have Nu Hybrid mode,
use Euro Digital Hybrid Wireless® (EU Dig. Hybrid).
E01, X
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.
HBR - Digital Hybrid Mode. This mode offers the best audio quality and is
recommended if your receiver supports it.
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.

www.lectrosonics.com 5
IFBT4 VHF Menu Diagram
E01,X Compat Modes
US Compat Modes

LECTROSONICS, INC.6
IFBT4 VHF 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 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
allow the IFBT4 VHF
to accommodate 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 below.
Switches 1 and 2
adjust the XLR pin
functions while switches
3 and 4 adjust the input sensitivity.
Power Input Connector
The IFBT4 VHF is designed to be used with the DCR12/A5U (or equivalent)
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.
Rear Panel Controls and Functions

www.lectrosonics.com 7
Accessories
DCR12/A5U
AC power supply for IFBT4 transmit-
ters; 100-240 V, 50/60 Hz, 0.3 A input,
12 VDC regulated output; 7-foot cord
with LZR threaded locking plug and
interchangeable blades/posts for use in
Europe, UK, Australia and USA (sold
separately).
A170AC
VHF straight whip antenna; right angle
BNC connector
ARG15
A 15 foot antenna cable of standard
RG-58 coax cable with BNC connectors
at each end. Loss of 1 to 2 dB with 0.25”
diameter.
ARG25/ARG50/ARG100
An antenna cable of Belden 9913F low-
loss coax cable with BNC connectors
at each end. Double shielded, flexible,
50 Ohms, with a foamed polyethylene
dielectric. Lower loss (1.6 to 2.3 dB) with
somewhat less weight than standard
RG-8 with the same 0.400” diameter.
Available in 25, 50 and 100 foot lengths.
RMP195
4 channel rack mount for up to four
IFBT4 transmitters. Rocker switch in-
cluded to work as a master power switch
if desired.
21425
6 ft. long power cord; coaxial to stripped
& tinned leads. Coaxial plug: ID-.080”;
OD-.218”; Depth- .5”. Fits all compact
receiver models that use CH12 power
supply.
21472
6 ft. long power cord; coaxial to stripped
& tinned leads. Right angle coaxial plug:
ID-.075”; OD-.218”; Depth- .375”. Fits all
compact receiver models that use CH12
power supply.
21586
DC16A Pigtail power cable, LZR stripped
& tinned.
DCR12/A5U
ARG15
ARG25
ARG50
ARG100
RMP195
.475”
.375” O.D.
.375”
.35”
.375” O.D.
21425
21472
21586
.475” O.D.
Locking collar with
5/16”-32 thread
.475” O.D.
Locking collar with
5/16”-32 thread
A170AC