Elecraft K3 Assembly Manual - Manual (Page 15)

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Install hardware to attach Q3 to the RF board near the rear left corner as shown in Figure 9 and Figure 11
on page 16.
Figure 9. Installing Q3 Hardware.
Locate the crystal I.F. filters. Two types of filters are available: standard 5-pole filters and optional 8-pole
filters (see Figure 10). One standard 5-pole 2.7 kHz filter is supplied. If you have elected to equip your K3 with
the optional 8-pole 2.8 kHz filter, it has been supplied instead of the 2.7 kHz filter. If you have purchased
additional filters, they may be installed now as well. If you plan to add filters later, spaces may be left for them.
For example, if you plan to add the FM or a 6 kHz AM filter later, you can leave spaces FL1 and FL2 open for
them and install the 2.8 kHz filter in position FL3. The filters are not hard to move about later, so if you aren’t
sure, install the widest at FL1, the next widest at FL2 and so on.
Enter the following data on Table 1.You will need this information to set up your filters after assembling
your K3. Be sure you’re following the rule described in the step above about the proper order for the filters.
Note that Table 1 is set up with FL1 to the right and FL5 to the left, just as they must be installed on the RF
board.
Enter the bandwidth of each filter in the row below the filter position in which it will be installed.
Enter the FREQ OFFSET shown on each filter. The optional 8-pole filters have no offset marked on
them. Enter a zero in the FREQ OFFSET column for those filters. For the 5-pole filters, note that the
frequency offset may be negative, indicated by a minus sign (single dash) ahead of the number.
Table 1. Filters Installed.
Note: FL1 is to the right and FL5 is to the left. In the next step you will install the filters
right-to-left on the RF board as well.
POSITION FL5 FL4 FL3 FL2 FL1 1
BANDWIDTH 2
FREQ OFFSET 3
1. If you’re installing the K-FL3B FM filter, place it in FL1 position since it is the widest bandwidth
filter available.
2. The bandwidth is shown in the label attached to the filters except the K-FL3B FM filter. Record a
bandwidth of 13 kHz for the K-FL3B FM filter.
3. All of the optional 8-pole filters have an offset of zero. Note that the 5-pole filters may have a
negative offset, indicated by a minus sign ahead of the number.