ELECRAFT KRX3 - Introduction; See Appendix A to Install or Change Crystal Filters in a Previously Assembled KRX3 A

3
Introduction
If your KRX3A is already installed in your K3, turn to Using the Sub Receiver on page 47 for
operating instructions.
The KRX3A sub receiver features specifications identical to the main K3 receiver including up to five roofing
filters and an independent, dedicated DSP system. The sub receiver can tune the same range of frequencies as
the main receiver, including frequencies outside of the Amateur bands when it is equipped with the optional
KBPF3 general coverage filter board.
The KRX3A has three major components as shown installed in a K3 in Figure 1. The shielded enclosure
contains the main KRX3A board, mixer and noise blanker pony boards, optional KBPF3 general coverage filter
board and roofing filters that you will assemble and mount in the enclosure.
Only a few basic tools are required to assemble the components and install them in the K3 (see page 6).
Figure 1. KRX3A Sub Receiver Installed in K3.