Elecraft K3 Assembly Manual - Manual (Page 16)

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Install the filters as shown in Figure 10. Refer to the list of filters you created in Table 1 to determine which
filter to install at each location.
CAUTION
1) Do not use screws longer than 1/4” (6.4 mm) to mount the filters. Use your ruler to
measure the screws before installing them. 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 10. Installing Crystal I.F. Filters.
Locate the K3 top cover. On the inside is a label with places to record the bandwidth (BW), and frequency
offset (FRQ) of each filter. Copy the information from Table 1 and place a check mark by Main (for main
receiver) on the label. Use pencil in case you change your filters later. This will keep the filter information with
your K3. The label also has a row for Gain. This is a value you can determine later after your K3 is assembled
and aligned. It is a value set in the K3’s MENU to adjust the overall gain for each roofing filter so the audio
remains constant when switching from one filter to another. Making this adjustment is described under Filter
Loss Compensation in your owner’s manual.