ELECRAFT XV144, Руководство пользователя

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51
RF Board Assembly – Part III
In the following steps you will install the RF Power module. The
procedure is the same for all three transverter models.
If you purchased the optional feet and bail for your transverter (see
page 81), install them on the bottom cover now.
You will need the following small hardware:
14 pan head black screws, 3/16” (4.8 mm) 4-40 thread.
2 pan head black screws, 1/2” (12.7 mm) 4-40 thread.
2 nuts, 4-40 thread.
4 2-D connectors.
2 flat washers, #4.
2 inside tooth lock washers, #4.
8 split lock washers, #4.
Install four 2-D connectors on the bottom corners of the RF Board.
Line up the offset holes of each 2-D connector so the side of the connector
is flush with the edge of the circuit board (see Figure 32). Secure each
connector to the circuit board with two black 3/16” (4.8 mm) pan head
screws and split lock washers.
HOLES OFFSET
FROM CENTER
TOP OF
BOARD
LINES UP FLUSH
WITH EDGE OF
BOARD
C
L
Figure 32. 2-D Connectors.
i
In the following steps you will install the hardware that
attaches the RF power module to the bottom cover. Follow the steps
carefully to ensure the module makes good thermal contact with the
bottom cover and the leads line up properly with the RF board. The
completed hardware assembly is shown in Figure 36 .
On the inside surface of the bottom cover, locate the area with four
holes along one side that matches the holes in the heat spreader. Test-fit
the larger of the two thermal conduction pads so that the holes in the pad
line up with the holes in the cover. Orient the pad so it does not hang over
the edge of the bottom cover.
Lift the thermal conduction pad and clean the surface of the bottom
cover under the pad using the sandpaper supplied, a sharp knife or other
tool. The pad should rest against clean metal.
Clean the paint off of the inside surface of the bottom cover around
the screw holes in the four corners where the 2D connectors will attach it
to the RF board (See Figure 35).
Inspect the edges of the heat spreader and remove any burrs with the
edge of a flat-blade screwdriver, knife or small file.
Replace the larger of the two thermal conduction pads over the clean
metal area on inside of the bottom cover so that the holes line in the pad
line up with the holes in the cover. Be sure the pad does not hang over the
edge of the bottom cover.
Place the heat spreader on the thermal conduction pad on so the screw
holes line up. Put a 1/2” (12.7 mm) pan head screw through each
unthreaded hole with the head on the bottom cover. Place a nut on each
screw and finger tighten.
Insert two black 3/16” (4.8 mm) pan head screws through the bottom
cover into the threaded holes in the head spreader. Tighten the screws.