Rf Board And Chassis; Rf Board Description; Rf Board And Chassis Assembly Procedure - ELECRAFT K3 Assembly Manual

RF Board and Chassis

RF Board Description

The RF PCB (Printed Circuit Board) is the heart of the K3 transceiver, both physically and electrically. During
assembly, it serves as an attachment point for other PCBs as well as chassis panels, acting as the glue that holds
things together. During operation, the RF board provides signal routing to and from all modules. For more
information, see Theory of Operation, RF Board, in the K3 Owner's Manual.

RF Board and Chassis Assembly Procedure

Remove the RF board from its anti-static packaging. The top side of the board is the side with the toroid
inductors and relays along with other components, including several connectors along one edge. The edge with
the connectors is the back edge of the board, while the front edge has notches cut in it that will fit around front
panel controls. Locate the six rectangular bare copper pads for the 2D fasteners (see Figure 5). There is one in
each corner of the board and one in the center of each side (see Figure 11 on page 14).
WRIST STRAP OR TOUCH
AN UNPAINTED METAL GROUND
BEFORE HANDLING THE RF BOARD.
Install 2D fasteners at the six spaces provided (one at each corner and at the center of each side of the RF
board). Mount the fasteners on the bottom side of the board as shown in Figure 6. Be sure the 2D fasteners are
oriented so the side of each fastener lines up with the edge of the RF board as shown.
4-40 SPLIT LOCK WASHERS
ESD SENSITIVE!
WEAR A GROUNDED
Figure 5. 2D Fastener Location on RF Board.
4-40 3/16" (4.8 mm) BLACK
PAN HEAD SCREWS
WIDE SHOULDER ON 2D
TOWARD EDGE
Figure 6. Installing 2D Fasteners on RF Board.
TYPICAL 2D FASTENER
LOCATION
10
2D ON THE
BOTTOM OF
BOARD
SIDE FLUSH
WITH EDGE