Replacement Part List

Now turn the receiver to be perpendicular to the transmitter. The signal

suddenly drops to almost nothing! This is a null. Move the receiver around a

little to see how sharp and precise this null point is and how dependent it is on

being exactly perpendicular.

Now let’s look at some other places to find nulls. Back away from the

transmitter and walk past it off the end, like this:

There was a null just as you crossed the axis of the transmitter, just like before!

This is called a

〝

crossing null

〞

and it is a very good thing to know about.

Walk around and see that the crossing null is detected any time you cross

either end of the transmitter, no matter how far away you are as long as you

are within range.