8
At the ends of the board you’ll find two short jumper locations, each labeled with a ground symbol
(
). Use component leads to make 3/4" (19 mm) U-shaped wires for each jumper (see Figure 3). Solder
the jumpers on the bottom side, keeping the top of the U-shape approx. 1/4" (6 mm) above the board.
Figure 3
i
In the following steps you’ll prepare and install several toroidal inductors. Winding the
toroids is not difficult. However, they must be wound exactly as indicated in the instructions, or the
transceiver will not operate correctly.
Use only the number of turns specified. It is not necessary to use
an inductance meter to precisely match the inductances shown on the schematic.
All the toroid cores used on the KFL1-4 board are type T37-6 (yellow, 0.37" [19 mm] in diameter). If
you aren't yet familiar with toroidal inductors, please read the information on page 13 of the K1 owner's
manual titled "Identifying Toroid Cores."
Locate the component outline for inductor L1 at the right end of the Filter board, near C21. Compare
this component outline to Figure 4, which shows two views of L1. In the next few steps you'll wind L1 and
prepare its leads, then mount it vertically as shown in the drawing at the right.
Note:
Leads 1 and 2 of L1
are identified for use in winding instructions, but are not printed on the PC board.
Figure 4
