A-6
CAUTION
1) Do not use screws longer than 1/4” (6.4 mm) to mount the filters. Longer screws may
extend into the optional 8-pole filter and destroy it. We strongly recommend you use a 1/4”
screw even when installing the 5-pole filters to reduce the possibility of damaging an 8-pole
filter should you change them later.
2) Do not over-tighten the screws. Too much torque may pull the threaded bushing out of the
bottom of the filter module.
Figure A-6. Installing the Crystal Filters.
Double-check to ensure you installed each filter in the location you noted in Table 1. If you make a
mistake recording the data or installing the filters and miss it now, you’ll need to disassemble the KRX3A
again to correct it.
Important: Do not over-tighten screws during reassembly. The screws should be tightened so that
the lock washers are fully compressed but never as tight as you can make them.
In the bottom half of the enclosure, check to ensure the four standoffs are tight against the enclosure. If
not, tighten the screws. Two are short standoffs for the board mounting screws and two standoffs have the
long screws threaded through them.
Place the KRX3A RF board in the bottom shield so that the long screws extend through holes shown in
Figure A-5. Press the circuit board down against the standoffs. The board may “snap” into position as the small
bumps along the edges of the board slip into the holes in the sides of the shield. When properly positioned, the
board will be against the standoffs in the bottom half of the enclosure. If needed, press down gently on the board
near the long screws to ensure it is not caught on the threads.
Secure the KRX3A main circuit board to the short standoffs at locations
in Figure A-5 with the 4-40
3/16” (4.8 mm) black pan head screws and #4 split lock washers you removed earlier. Do not use interior tooth
lock washers.
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