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

Lectrosonics IFBT4 VHF Transmitter with IFB Beltpack Receiver Kit

Lectrosonics IFBT4 VHF Transmitter with IFB Beltpack Receiver Kit

B&H # LEIFBT4VHFK (B&H Kit)
Lectrosonics IFBT4 VHF Transmitter with IFB Beltpack Receiver Kit

Kit includes:


Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz) Lectrosonics IFBR1a-VHF Multi-Frequency Beltpack IFB Receiver (174.100 to 215.750 MHz) Lectrosonics IFBT4 VHF Transmitter with IFB Beltpack Receiver Kit

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Product Highlights

  • Frequency-Agile IFB Transmitter
  • Multi-Frequency Wireless IFB Receiver
  • 1/4" Wave BNC Whip Antenna
  • AC Adapter
  • Leather Pouch with Integral Belt Clip
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  • 1Description

The Lectrosonics IFBT4 VHF Transmitter with IFB Beltpack Receiver Kit from B&H includes an IFB (Interruptible Fold Back) frequency-agile Transmitter and an IFBR1a-VHF multi-frequency wireless beltpack receiver. It can be used for talent cueing and crew communication in broadcast, theater, live stage, and motion picture production.

The transmitter features 50mW output power and uses Lectrosonics patented Digital Hybrid Wireless system. When paired with the kit's receiver, the system can be programmed with up to five additional frequencies, and stored in the memory using the scan mode.

The B&H IFB transmitter and beltpack kit is suitable to drive a wide variety of earbuds, headphones, and induction neck loops (sold separately) at substantial levels for most monitoring, and cueing system applications.

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

    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 IFBR1a-VHF Multi-Frequency Beltpack IFB Receiver (174.100 to 215.750 MHz)

    The IFBR1a-VHF from Lectrosonics is a multi-frequency wireless beltpack IFB (Interruptible Fold Back) receiver that can be used for talent cueing and crew communication in broadcast and motion picture production. In addition, the IFB receiver provides simplicity and flexibility in a package that is intuitive for untrained users to operate.

    Featuring two rotary-control switches on the side panel, the IFBR1a-VHF receiver can be programmed with up to five additional frequencies, and stored in the memory using the scan mode. If more than one frequency is stored in the receiver, the operator can scroll through all stored frequencies by simply pressing the volume knob.

    Furthermore, it is built durable in a machined aluminum housing, and has a battery door that stays permanently attached when opened. It is powered by a single 9V alkaline battery, and will run for 8 hours, or up to 20 hours using a 9V lithium battery.

    Finally, the receiver will drive a wide variety of earbuds, headphones and induction neck loops at substantial levels with loads from 16 to 600 ohms. An Allen wrench is included to adjust the frequencies manually, and a leather carrying case is also included.

Table of Contents
  • 1Description
  • Lectrosonics IFBT4-VHF Frequency Agile IFB Transmitter (174.100 to 215.750 MHz)
    Operating Frequency 174.100 to 215.750 MHz
    Channel Frequencies 239
    Channel Spacing 175 kHz
    RF Power Output 50 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 Selection Momentary pushbutton switches, tune Up and Down
    Compatibility Modes Two: IFB and Digital Hybrid Wireless (400 Series)
    Pilot Tone 29.997 kHz IFB & 400 MODE; each frequency has a unique pilot tone
    Modulation IFB Mode: FM, ±20 kHz deviation
    Digital Hybrid Mode: ±75 kHz
    Frequency Response IFB Mode: 100 Hz to 8 kHz, ±1 dB
    Digital Hybrid Mode: 30 Hz to 20 kHz ±1 dB response (see Roll Off)
    LF Roll Off Menu selectable for 3 dB down at 35 Hz or 50 Hz
    Audio Compression 2 to 1 (IFB mode)
    Output Impedance 50 ohms
    Audio Input Levels 0 dBu for Line, RTS1 & RTS2
    -10 dBu for Clear Com
    -42 dBu for mic dry inputs (no phantom power)
    +/-50 VDC maximum
    Configuration Audio Input: Balanced and unbalanced rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear Com
    Audio Input Impedance Greater 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 Jack Standard XLR female connector
    Input Power 12 to 14 VDC typical, 200 mA maximum
    Maximum Input Range: 6 to 18 VDC
    Power Input Connection Coax type, locking LZR RL26AE
    Indicators Backlit LCD: Displays modulation meter, frequencies, modes, roll-off, and audio level
    Front Panel Controls Menu: Momentary pushbutton switch
    Power Off-Tune-Xmit: 3-position slide switch
    Select Up: Momentary pushbutton switch
    Select Down: Momentary pushbutton switch
    Rear Panel Controls Input Mode Select: 4 section DIP switch
    Emission Standard 180KF3E
    Dimensions (L x W x H) 5.25 x 3.25 x 1.25" (13.3 x 8.25 x 3.17 cm)
    Weight 9 oz (255 g)
    Packaging Info
    Box Dimensions (LxWxH) 14.0 x 10.7 x 4.2"
  • Lectrosonics IFBR1a-VHF Multi-Frequency Beltpack IFB Receiver (174.100 to 215.750 MHz)
    Operating Frequency 174.100 to 215.750 MHz
    Channel Frequencies 239
    Channel Spacing 175 kHz
    Frequency Control Crystal controlled phase locked loop
    Sensitivity 1 uv (20 dB SINAD)
    Signal to Noise 95 dB A-weighted
    Squelch Quieting 90 dB
    AM Rejection 50 dB, 10 uv to 100 mv
    Modulation Acceptance ±20 kHz
    Spurious Rejection Greater than 70 dB
    Third Order Intercept 0 dBm
    Frequency Response 100 Hz to 10 kHz, (±1 dB)
    Pilot Tone 29.997 kHz, 4.5 kHz deviation (fixed crystal controlled)
    Headphone Out Audio: 1 Vrms into 50 ohms minimum
    Antenna Headphone cable
    Programmable Memory 5 frequencies
    Front Controls Single knob controls Audio Output Level, Power On, Programming, and Scan Frequency selection
    LED Indicators Tricolor LED for power on, blinks indicating channel number, blinks fast during scan, and turns yellow or red for low battery
    Power Requirements Single 9 V alkaline battery for approximately 8 hours operation
    Single 9 V lithium battery for approximately 20 hours operation
    Power Consumption 60 mA
    Dimensions (L x W x H) 3.6 x 2.4 x 0.8" (9.1 x 6.1 x 2.0)
    Weight 7.3 oz (207 g) with battery
    Packaging Info
    Box Dimensions (LxWxH) 9.7 x 8.0 x 3.0"

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