Refereeing Portal Exciter = The Perceptls™ Portal Exciter, part of the Perceptual Buddy™ System, is a low frequency transmitter. The Portal Exciter’s transmissions cause approaching Perceptual Buddy tags to transmit location information to the Perceptual Local Area Receivers. Tools and Materials Required ¢ Perceptual Portal Exciter (p/n 805A1801) + Drill and drill bits » Keypad + Wire Installing the Portal Exciter The Perceptual Portal Exciter connects to the LonWorks® network.