54 ELECRAFT
Review Figure 4-2 before installing Q2 in the next step.
Q2 is a ZVN4424A transistor, which has a slightly modified TO-92
package. It is flat on both sides, and the labeling may be on the
smaller flat side. The wider flat side must be aligned with the flat
side of the component outline.
Install Q2, which is near C113 (just installed). Be sure to
orient Q2 as shown in Figure 4-2.
RFC3 is wound on an FT37-43 core (dark gray) using 16 turns
of red enamel wire (12", 30 cm). Wind this inductor in the same
manner as RFC14. Install RFC3 vertically, just to the left of W1.
Install 4.7 µH slug-tuned shielded inductors (marked "T1005")
at L1 and L2, near the back-left edge of the board.
Install the 40-meter low-pass filter components, which are
listed below. These components are located near Q22 (2N5109
transistor with heat sink).
__ C225, 390 (391) __ C228, 56 (56) __ C227, 330 (331)
__ C226, 680 (681) __ C229, 220 (221)
__ L25, T44-2 (red), 14 turns #26 red enamel wire, 14" (35 cm)
__ L26, T44-2 (red), 12 turns #26 red enamel wire, 13" (33 cm)
i
The leads of some bottom-mounted components may need
to be pre-trimmed before mounting and soldering. See Page 11.
Install the following components on the bottom side of the
board, starting with C207 at the back left. Once all components
have been installed, solder them on the top side, being careful not
to damage any adjacent top-mounted components.
__ C207, .001 (102) __ C216, .001 (102) __ C223, .001 (102)
__ C224, .047 (473) (bend body down before soldering)
__ C204, .001 (102) __ C208, .001 (102) __ C195, .001 (102)
(continued)
__ C133, 0.1 (104) (bend body down before soldering)
__ C135, .01 (103) __ C122, 56 (56) __ C119, .01 (103)
__ C17, .001 (102) __ C27, .001 (102) __ C104, 68 (68)
__ C29, 12 (12) __ C28, 12 (12)
__ R34, 2.7 k (RED-VIO-RED)
__ RFC2, 100 µH (BRN-BLK-BRN) __ RFC7, 15 µH (BRN-GRN-BLK)
Find the "C6" label, along the back edge. The three pads near
C6 are labeled "J15" on the top side (for a future option module).
Install C6 (4.7 pF) into the outer two of the three pads.
Locate L31, a 10 µH shielded solenoidal inductor (black case;
may not be color coded). L31 is mounted on the bottom of the
board, near the right edge. When soldering L31, be careful not to
damage diode D18, which is on the top side near one of L31’s leads.
Install the group of components listed below on the bottom of
the board. C183 is near the front left corner.
__ C183, .01 (103) __ C186, .01 (103)
__ C161, .01 (103) __ C150, 330 (331)
__ C90, .047 (473) (bend body down before soldering)
__ C157, .047 (473) (bend body down before soldering)
__ R77, 220 (RED-RED-BRN) __ R76, 10 (BRN-BLK-BLK)
__ R75, 680 (BLU-GRY-BRN) __ R94, 82 (GRY-RED-BLK)
__ R99, 270 (RED-VIO-BRN) __ R98, 270 (RED-VIO-BRN)
__ R100, 820 (GRY-RED-BRN) __ R110, 5.6 k (GRN-BLU-RED)
__ R114, 3.9k (ORG-WHT-RED) __ R18, 1 M (BRN-BLK-GRN)
__ R29, 10 k (BRN-BLK-ORG)
__ R19, 2.7 k (RED-VIO-RED)
__ RFC12, 100 µH (BRN-BLK-BRN)
__ D36, 1N4007
__ RFC10, 1 mH (BRN-BLK-RED)
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