Communication Concepts FL1 Low Pass Filter - Manual (Page 3)

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The proper method for counting the turns on a toroidal inductor is shown in
Figure 3. The core is shown as it would appear when stood on its edge with the
narrow dimension toward the viewer. In this example, a four-turn winding has
been placed on the core.
Figure 3 – Toroid Turns Counting Pictorial
Filter Construction
The construction of the filter is fairly simple but requires some care. A
component layout pictorial is shown in Figure 4. For identification purposes, the
foil side of the PC board is the bottom. The components are placed on the
topside of the PC board and soldered on the bottom. The PC board is the same
for all frequency bands. The toroid cores are identified by the color of the core.
The T-106-2 is gray in color and the T-106-6 is yellow.
Figure 4 – Component Layout Pictorial