Elecraft KX1 Manual - Manual (Page 49)

48
E
LECRAFT
Assembly - Part III
In Part III you’ll install and test the transmitter and lowpass filter
components.
Remove the VFO knob if you haven’t done so already.
Turn the board top face up with KX1 in the upper left corner.
Install the following 1/4 watt resistors to the upper left of encoder Z1:
_ R9, 300 ohms (org-blk-brn).
_ R11, 10 ohms (brn-blk-blk)
_ R31, 1k (brn-blk-red) Note: On some boards, R31 may be
printed in reverse (mirror image).
Turn the board bottom face up with jack J1 in the upper right
corner. Install the following 1/4 watt resistors near the center of the
top edge.
_ R30, 22 ohms (red-red-blk) above relay K1.
_ R26, 22 ohms (red-red-blk) above electrolytic capacitor C7.
_ R27, 22 ohms (red-red-blk) above R26.
_ R10, 47 ohms (yel-vio-blk) to the right of R27.
_ R24, 22k (red-red-org) on the top edge of the board
above R10.
Install zener diode D7 (1N4756A) next to resistor R30. Be sure to
align the banded end of the diode over the band on the board.
Install trimmer potentiometer R4, 100 ohms (101), next to
diode D7 and resistor R30 as follows:
_ Position R4, 100 ohms (101), and hold it in place while tack-
soldering one pin.
_ Check to be sure all the shoulders of all three pins are against
the board, the solder and trim all three pins.
_ Set R4 fully counter-clockwise.