Elecraft KPA100 Manual - Manual (Page 35)

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There are two sizes of Teflon wire (gray): #18 (larger) and #22
(smaller). The smaller size will be used at T1, and the larger at T2. Cut
a 9" (23 cm) length of the #22 Teflon wire.
Remove 1/4" (6 mm) of insulation from one end, then twist the
strands together. Tin the strands using a small amount of solder.
Solder the Teflon wire to the pad labeled T1-4.
Thread the wire through the core (1 turn) as shown in Figure 26a.
You'll then have one loop of wire on the left side of the core.
Add a second turn by passing the free end of the wire back through
both holes in the core, as you did in (a). Pull on the wire so that the
winding is tight. The winding should then look like Figure 26b, with two
loops on the left side.
Add a third turn, again passing the free end back through both holes
in the core (Figure 26c). Pull the wire to tighten the winding.
Count the loops on the left side to make sure you now have
exactly three. There will be two loops on the right side, plus the two ends
of the wire.
Cut the free end of the wire to a length of 5/8" (16 mm), measured
from where it exits the core. Remove 1/4" (6 mm) of insulation, then twist
and tin the leads.
Solder the wire to the pad labeled T1-5.
4
4
(a)
(b)
4
5
(c)
1
2
3
Figure 26