Turn the K3S right side up. Unplug all filters to be repositioned (those whose mounting screws have been
removed). Lift the filters at each end carefully, first one end then the other, until the connectors separate.
Reposition the filters as required. They will only fit one way. If you put one in backwards, it will not fit
within its outline, and the standoff will not line up with the screw hole in the RF board (or sub receiver board).
Turn the K3S (or sub receiver module) upside down again. Install the mounting hardware shown below.
Filters may be supplied with either a black 3/16” or bright-plated 1/4” pan-head screw. A screw
longer than 1/4” may extend into the 8-pole filter unit and damage it.
Do not over-tighten the screws. Excess torque may pull out the threaded standoff.
Re-install the bottom cover (if applicable) using seven 4-40 x 3/16” black pan head screws. Replace the
screws securely, but do not over tighten them. All screws must be used to maintain shielding performance.
The top cover and sub receiver (if applicable) will be re-installed in at later step.
Turn to Crystal Filter Setup (pg. 48). Follow all instructions for the main receiver and transmitter.
If you have the KRX3A option, re-install the sub receiver module as described in the KRX3A manual.
Then turn to Crystal Filter Setup and follow all instructions for the sub receiver.
Position the top cover on the K3, with its rear tab inserted under the top edge of the rear panel. Then plug
the speaker wire into P25 on the KIO3B board at the left rear of the K3S.
Secure the top cover with 4-40 x 3/16” flat head screws at all locations.
This completes crystal filter installation.
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