Wireless IFB (interruptible fold back) systems are used for talent cueing and crew communications in broadcast and motion picture production. In other cases, the IFB system is used by directors and other management to monitor program audio during a production. The IFB system from Lectrosonics provides simplicity and flexibility in a package that is intuitive for untrained users to operate.
The default frequency of the receiver is set by two rotary switches on the side panel. Up to five additional frequencies can also be programmed into the receiver 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.
The Lectrosonics IFBT4-VHF transmitter was designed for use in broadcast, motion picture, theater, and stage applications where extended operating range and high-quality audio are essential. The transmitter can also be used as a stand-alone device or patched directly into popular intercom systems.
The transmitter features 50 mW power output for superior long-range use. A pilot tone signal controls the audio squelch on the receiver to eliminate noise when the IFBT4-VHF is turned off and prevents the receiver from locking onto false signals. The IFBT4-VHF incorporates a multi-use XLR input jack and DIP switches with settings for dynamic mic, line level, Clear Com® and RTS sources. In IFB mode, the system is optimized for vocal clarity.