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 R1a receiver 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.

Basic operation is simply a matter of rotating the knob to turn power on and adjusting the volume level. Additional frequencies are added by holding the knob in until the LED begins blinking and the receiver begins to scan. The receiver will search for signals that contain a pilot tone and automatically stop scanning and wait for the operator to either store that frequency or continue scanning. A special button push sequence is required to set the receiver into the scanning mode to prevent accidental changes to the receiver memory. Simplified instructions are laser engraved into the housing of the receiver.

The scanning process is performed at two different sensitivity levels. The first scan is performed at a reduced sensitivity to avoid falsely locking onto IM (intermodulation) signals rather than true carriers. This reduced sensitivity scan is necessary when the unit is programmed in close proximity to the transmitter. If no signals are found in the first scan, a single button push will set the r