Elecraft KRX3 User Manual download pdf (Page 35)

If you have the KPBF3 option, install the board now with 4-40 1/4” (6.4 mm) pan head screws and #4 split

lock washers as shown in Figure 41. These screws and washers are supplied with your KBPF3 option. Be sure

all three connectors on the KPBF3 are properly mated with their counterparts on the KRX3 board.

Figure 41. Mounting the KPBF3 Board.

Locate the subreceiver RF module top cover. It has a label with places to record the bandwidth (BW), and

frequency offset (FRQ) of each filter. Copy the information from Table 1. Note that the filters read right to left

on the label, just as they were installed on the pc board. Place a check mark by Sub (for subreceiver) on the

label. Use pencil in case you change your filters later. The label also has a row for Gain. This is a value you can

determine after your 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.

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Elecraft KRX3 User Manual Page 35