Allen-Bradley 1771-KRF/B User Manual page 26

using the same channel translator. However, you must leave a 100 KHz
(.1 MHz) guardband between the subchannel(s) you select for the
1771-KRF and the subchannel(s) you select for the 6608 modems. See
Appendix B "Using the 1771-KRF with 6608 Modems" for details.
Chapter 3
Selecting Channels and Setting Switches
3 7