 To use Lorenz , a conventional radio was tuned to the transmission , and the operator would listen for the signal and try to determine if they heard dots or dashes . If they heard dots , the short 0 @.@ 2 s pulse , they would know they were too far to the left , and turned to the right in order to reach the centreline . Dashes indicated they should turn left . In the centre the receiver could hear both signals , which merged to form a steady tone , the equisignal . 
