 The PE Beam equipment consisted of a transmitter on the Fisherman Islands side of the Brisbane River housed in a concrete hut, at a bearing of 68 degrees and 25 minutes from the receiver at Myrtletown.The current status of the transmitting hut is unknown, due to the development of wharfage facilities around that location.The PE beam transmitter consisted of a power valve that transmitted in the visible and infrared wavelengths.