Elecraft KX1 Manual - Manual (Page 50)

E
LECRAFT 49
Turn the board top face up with KX1 in the upper left corner.
Install the following capacitors in the area above encoder Z1. Be sure
to check the each capacitor to ensure it is no more than 5/16” (7.9 mm)
above the board.
_ C42, .01 µF (103) to the left of electrolytic capacitor C35 on
the top edge of the board.
_ C34, .01 µF (103) to the right of electrolytic capacitor C35 on
the top edge of the board.
_ C41, .01 µF (103) near the upper left corner of encoder Z1.
_ C43, .1 µF (104) above C41.
_ C44, .022 µF (223) near RF Gain potentiometer R1.
i
Wear your ESD wrist strap or touch a ground frequently
while installing the transistors in the following steps.
Install the following transistors. Be sure the top of the transistors
is not more than 5/16” (7.9 mm) above the board.
_ Q1 (J309), directly to the right of the three-digit LED display.
_ Q5 (2N3904) near the upper left corner of encoder Z1.
_ Q4 (2N4124) above Q5 near the upper edge of the board.
i
In the following steps you’ll wind and install toroidal
inductors L3 and transformer T1. They must be wound as exactly
indicated in the instructions, or the transceiver will not operate
correctly.
6
Turn the board bottom face up with J1 in the upper right corner.
Locate the printed outlines for L3 and T1 near the top center of the
board to the right of trimmer pot R4.
Locate the two dark gray FT37-43 cores.
REMOVE INSULATION
UP TO THE CORE ON
BOTH LEADS
LEAVE THIS SPACE ON CORE OPEN
THIS LEAD PASSES
OVER FRONT OF
CORE
Figure 18. Winding Inductor L3.
6 Prewound toroids are available from an Elecraft-approved source. See
www.elecraft.com for details.