A-5
Important: The information recorded in the next step is required to enable your
filters after reassembling your K3. Record the data in the table clearly and completely. If
the information is incomplete or incorrect, you will have to disassemble your KRX3 again to
retrieve it before you can use your subreceiver. Recommend using a pencil so you can
change the data later should you decide to install additional filters.
Enter the following data on Table A-1. 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 5-pole filter (see Figure A-6). The optional 8-pole filters have
no offset. 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 A-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 KRX3 RF board as well.
Install the filters as shown
in Figure A-6. Refer to the list of filters you created in Table A-1 to determine
which filter to install at each location.
If the subreceiver RF module top cover has a label on it with places to record the bandwidth (BW), and
frequency offset (FRQ) of each filter, copy the information from Table 1, erasing and moving the information
already there to match your filter setup. The label will ensure you have the installed filter information in case this
page is misplaced. (If you do not have a filter information label on your subreceiver, you can obtain one from
Elecraft.) Use pencil in case you change your filters later. Note that the filters read right to left on the label, just
as they were installed on the pc board and shown on Table 1. The label also has a row for Gain. This is a value
you can determine later after installation is finished. 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.
POSITION FL5 FL4 FL3 FL2 FL1
1
BANDWIDTH
2
FREQ
OFFSET
3
1. If you’re installing the K-FL3B FM filter, place it at FL1 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.
(1 pages)
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