Elecraft T1 Assembly Manual - Manual (Page 18)

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Locate the five T37-6 yellow toroids. Use these toroids to prepare inductors L1 through L5 as listed
below. Position the turns on each toroid as shown in Figure 10 so the leads will line up with the holes in the
PC board. Note that L1 is wound in the opposite direction from the others. Install each coil with the core
upright against the top of the board inside its printed outline. Solder and trim the leads.
Inductor Wire Length Number of Turns Core
L1 6” (16 cm) 3 close wound Yellow
L2 6.5” (17 cm) 5 spaced Yellow
L3 7” (18 cm) 7 spaced Yellow
L4 9” (23 cm) 11 spaced Yellow
L5 11” (28 cm) 16 spaced Yellow
L1 - 3 TURNS L2 - 5 TURNS L3 - 7 TURNS L4 - 11 TURNS L5 - 16 TURNS
Figure 10. Toroid Inductors L1 - L5.
i
Do not use glue or other fixative to hold the toroids on the PC board. Such materials may
affect their electrical characteristics. The toroids need no support other than their own leads.
Locate the two T37-2 red toroids. Use these toroids to prepare L6 and L7 and install them in the
remaining spaces shown on the PC board.
Inductor Wire Length Number of Turns Core
L6 13” (33 cm) 20 spaced Red
L7 18” (46 cm) 29 close wound Red
L6 - 20 TURNS L7 - 29 TURNS
Figure 11. Toroid Inductors L6 and L7.