Mounting The Sub Receiver Auxiliary Dsp Board - ELECRAFT K3s Kit Assembly And Instruction Manual

Mount the last knob on the VFO B encoder shaft to the right (under the pushbutton switches) as shown in
Figure 54. Before tightening both set screws, adjust the position of the knob against the felt washer to produce
the desired amount of drag for smooth movement without the knob turning too freely.

Mounting the Sub Receiver Auxiliary DSP Board

If you purchased the optional KRX3A sub receiver with your K3s, install the KXR3 auxiliary DSP board as
follows. If you did not purchase the KRX3A, go to Installing the KDVR3 Digital Voice Recorder Option on
page 44 if you purchased the KDVR3 Digital Voice Recorder Option with your K3s. If you do not have the
KDVR3, go directly to Mounting the DSP Board Assembly on the Front Panel on page 45.
The parts called for in the following procedure are included in the KRX3A sub receiver kit. Install only the
Auxiliary DSP board as described in the following steps. You will complete the KRX3A installation after the
basic K3s is assembled, calibrated and tested.
If your KRX3A kit was supplied with 1/4" (6.4mm) long nylon screws, skip this step. If you have 1/2"
(13mm) nylon screws, cut all three of them to length as follows:
Screw three 4-40 nuts onto the 1/2" (13 mm) 4-40 nylon screw as shown in Figure 55.
Cut off the nylon screw flush with the last nut. Sharp diagonal cutters or a knife will cut the nylon.
After cutting, remove all three nuts. (The nuts establish the correct length for the screw and "clean up"
the thread where you cut the screw.)
Figure 54. Mounting the VFO B Knob.
Figure 55. Preparing the Nylon Screw.
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