Elecraft KRC2 Manual - Manual (Page 18)

18
Using the KRC2
The features described in this section are available with KRC2 firmware version 1.5 and later.
Please see earlier revisions of this manual for operation with previous firmware versions.
KRC2 operation with an Elecraft K2 or K2/100 Transceiver
The KRC2 should be connected to the K2 using the Male/Female DB9 cable assembly described
in the previous section. The KRC2 derives its operating power from the K2 in this configuration.
In the KRC2's factory configuration, the per-band outputs (both sink and source) will be turned on
or off based on the K2's selected band. This default behavior will suffice for many amateur station
applications. However, the correspondence between selected band and output driver states is fully
programmable. Band mapping and other configuration changes are accomplished using the KRC2
configuration utility, available from the Elecraft web site (www.elecraft.com). For example, if the
station includes a 20/15/10 meter tri-band beam, the 20 m sink output could be programmed to be
turned on whenever the K2 is set for 20, 15, or 10 meters. Another alternative for mapping
multiple bands to a single antenna or other device is to "wire-OR" the outputs. This is explained in
more detail later in the manual.
Switch S5, accessible through a small hole in the side of the KRC2 sets the operational mode of
the unit. For normal operation, the OP (operate) position of S5 is used. This allows the KRC2 to
communicate with the K2 via its AuxBus and RS-232 interfaces. Set S5 to the DL (Download)
position for downloading firmware upgrades or device configurations to the unit. Firmware
upgrades can be downloaded using the KRC2 download utility, available from the Elecraft web
site.