(Creating the Circuit ) Different Frequencies Do Different Things

 We’re hooked to a test station that is attached to the end of a steel main. We’re utilizing a transmitter frequency of 512 Hz. The signal can only travel westward, and then it’s going to turn north. (Figures 1-2). 

As we locate on 512 Hz, we’re going to come across a plastic service that is attached to the steel main. The plastic service has a tracer wire. At the service tap, it is cadwelded to the steel main. The 512 Hz does not want to come up the tracer wire (Figure 3). At the opposite end, it is a far-end that is not grounded. Because the path of least resistance for this low frequency is to stay on the steel main, you’ll see on the receiver, that we have no current that can build a field on that tracer wire (Figure 4).

As Seen in: