Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)

BH #LEIFBT4VHF • MFR #IFBT4-VHF
Lectrosonics
Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)
Key Features
  • Digital Hybrid Wireless Technology
  • Microprocessor-Controlled Operation
  • 50mW Power Output
  • Pilot Tone Squelch Control
The IFBT4-VHF Frequency Agile IFB Transmitter from Lectrosonics is designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. It can be used as a stand-alone device, or it can be patched directly into a popular intercom system.
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$1,024.00
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Lectrosonics IFBT4-VHF Overview

The IFBT4-VHF Frequency Agile IFB Transmitter from Lectrosonics is designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high quality audio are essential. It can be used as a stand-alone device, or it can be patched directly into a popular intercom system.

Featuring 50mW output power and a design based on Lectrosonics patented Digital Hybrid Wireless system, the transmitter pilot tone signal controls the audio squelch on the IFBRA-VHF receiver (sold separately) to eliminate noise when the transmitter is turned off. This prevents the receiver from locking onto false signals. An LCD display is backlit for use in dimly lit conditions and is also visible in direct sunlight.

Furthermore, DIP switch settings on the rear panel provide direct compatibility with RTS and Clear Com intercom systems. A preamp stage is also included in the input stage and allows direct connection to dynamic microphones in stand-alone applications. Moreover, direct output at studio line level can also be fed directly into the transmitter.

Finally, the transmitter is housed in a strong, machined-aluminum case with an electrostatic powder coating and an anodized finish. It is powered by 6 to 18 VDC via a locking connector on the rear panel. Additionally, the transmitter is supplied with a 1/4 wavelength whip antenna, which is a detachable, galvanized-steel cable that also connects to a locking 50 ohms BNC connector on the rear panel. The AC power supply is also included.

Lectrosonics IFBT4-VHF Specs

Operating Frequency174.100 to 215.750 MHz
Channel Frequencies239
Channel Spacing175 kHz
RF Power Output50 mW
Frequency Stability±.001% (10 ppm) @ 77°F (25°C)
Temperature Stability±.001% (10 ppm) from -22 to 122°F (-30 to 50°C)
Channel SelectionMomentary pushbutton switches, tune Up and Down
Compatibility ModesTwo: IFB and Digital Hybrid Wireless (400 Series)
Pilot Tone29.997 kHz IFB & 400 MODE; each frequency has a unique pilot tone
ModulationIFB Mode: FM, ±20 kHz deviation
Digital Hybrid Mode: ±75 kHz
Frequency ResponseIFB Mode: 100 Hz to 8 kHz, ±1 dB
Digital Hybrid Mode: 30 Hz to 20 kHz ±1 dB response (see Roll Off)
LF Roll OffMenu selectable for 3 dB down at 35 Hz or 50 Hz
Audio Compression2 to 1 (IFB mode)
Output Impedance50 ohms
Audio Input Levels0 dBu for Line, RTS1 & RTS2
-10 dBu for Clear Com
-42 dBu for mic dry inputs (no phantom power)
+/-50 VDC maximum
ConfigurationAudio Input: Balanced and unbalanced rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Com
Audio Input ImpedanceGreater than 2 KOhms balanced, greater than 1 KOhms unbalanced at any gain setting
Gain Control Range-18 dB to +24 dB (0 dB nominal center), Menu selectable
Audio Input JackStandard XLR female connector
Input Power12 to 14 VDC typical, 200 mA maximum
Maximum Input Range: 6 to 18 VDC
Power Input ConnectionCoax type, locking LZR RL26AE
IndicatorsBacklit LCD: Displays modulation meter, frequencies, modes, roll-off, and audio level
Front Panel ControlsMenu: Momentary pushbutton switch
Power Off-Tune-Xmit: 3-position slide switch
Select Up: Momentary pushbutton switch
Select Down: Momentary pushbutton switch
Rear Panel ControlsInput Mode Select: 4 section DIP switch
Emission Standard180KF3E
Dimensions (L x W x H)5.25 x 3.25 x 1.25" (13.3 x 8.25 x 3.17 cm)
Weight9 oz (255 g)
Packaging Info
Package Weight2.575 lb
Box Dimensions (LxWxH)14.1 x 10.45 x 4.25"
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