Elecraft KRC2 Manual - Manual (Page 26)

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Using the KRC2 with non-Elecraft Radios
The KRC2 is designed to accept band information from radios other than the K2. As discussed in
KRC2 Jumper Configuration, setting jumpers W1-3 for Kenwood mode operations allows the
KRC2 to interface with those radios in a manner similar to the K2. Other radios that do not use
this command set may not be interfaced using this mode.
To use the KRC2 with an ICOM transceiver that has analog (stepped voltage) band output, you
should set the W1-3 jumpers for Analog Mode using the desired input (8R/AN1 or ALC/AN3),
and connect the transceiver’s analog output to the appropriate input pin on J1 or J2. Be sure to
remove W19 or W20 as appropriate. Power the KRC2 using an external 12-volt supply connected
to the KRC2’s DC barrel jack. The KRC2 should now set its band outputs according to the voltage
presented by the radio.
The three analog inputs have slightly different characteristics you should consider when choosing
which to use. The 8R/AN1 and ALC/AN3 inputs have voltage divider networks on their inputs
that divide the input by 2. Thus their input range is from 0 to 10 volts. The VRDET/AN2 input has
no divider network, giving it a voltage range of 0 to 5 volts. Each input voltage is filtered through
a band selection table that determines the selected band. There are three tables, one for each input.
The factory-configured tables are set up for Icom radios with voltage range of 0 to 8 volts for the
wide-range inputs, with the third table set for the Yaesu FT-817 transceiver’s analog output. These
tables are user-configurable using the KRC2 Configuration tool
To use the KRC2 with a Yaesu radio or computer parallel port outputs, set jumpers W1-3 as
follows: W1 OUT, W2 IN, W3 OUT as described in Table 2. You may then connect the radio or
computer outputs to the KRC2’s ABCD terminals, with the return ground connected to one of the
terminals labeled ‘G’. Power the KRC2 from an external 12-volt supply connected to the DC
barrel jack. The unit should now switch the driver outputs in accordance to the digital inputs it
sees. Note that in addition to the standard BCD outputs, the KRC2 recognizes additional band
codes according to Table 5.
Binary coding Hex Band Binary coding Hex BAND
0001 01 160m 1000 08 12m
0010 02 80m 1001 09 10m
0011 03 40m 1010 0A 60m
0100 04 30m 1011 0B unused
0101 05 20m 1100 0C XVT1
0110 06 17m 1101 0D XVT2
0111 07 15m 1110 0E XVT3
Table 6