Elecraft K60XV Manual User Manual
Page 8
8
K2 RF Board Preparation
Remove the nut (but not the screw or lock washer) holding driver transistor Q6 in place. Thread the
supplied 9/16" long (14 mm) nylon standoff onto the screw, from the top side of the RF board, in place of
the original nut. (The screw should be installed from the bottom.) Do not overtighten, as this might strip the
threads of the standoff.
Desolder and remove jumper W6, which is near J13 on the RF board. (J13 is close to the rear panel and
slug-tuned inductor L2.)
Locate capacitor C6 on the K2 RF board. It can be found near the striped end of the 40-meter band-
pass filter relay (K1). On revision B or later K2 RF boards, C6 is on the bottom side of the board, and the
top side is labeled "J15" at that same location, with pads for a 3-pin connector. On earlier K2 RF boards,
C6 is on the top side, and there's no "J15" label.
Remove C6, being very careful not to damage its pads or traces. Completely remove residual solder
from the holes using solder wick.
Locate the 3-pin female connector supplied with the K60XV kit, identified as RF-J15 in the parts list.
If your K2 does not have the "J15" label at the position of C6, pull out the center pin of the 3-pin connector
using long-nose pliers. (Using just the two outer pins will have no impact on performance.)
Install the 3-pin connector on the top side of the board, at the location for C6/J15. Solder one pin first.
Once you're sure the connector is flat against the board and not tilted, solder the remaining one or two pins.
Locate the 8-pin female connector, identified as RF-J13 in the parts list. Install this connector at J13
on the RF board. Use the same technique you used in the previous step.
On the top side of the RF board in the synthesizer area, locate C71 (82 pF). C71 is near relays K13 and
K14. Desolder and remove C71.
Install a 120-pF capacitor at C71 ("121", identified in the K60XV parts list as RF-C71).
If your K2 serial number is 3000 or higher (revision B or later RF board), you'll find locations in this
area of the board for varactor diodes D19 and D20 on the top side (MV2109), and R29 should already be
installed on the bottom. Install the two varactor diodes: __ D19; __ D20. Skip the next two steps.