Entering Cross-band mode
Turn the APRS modem off.
Set a UHF frequency in either the upper or lower display, using either the VFO or memory.
Set a VHF frequency in the other display, using either the VFO or memory.
Turn the FTM-400 off.
Press and hold the lower 3 buttons to the right of the display then press the power button. “X-BAND Repeater” will be displayed between the upper and lower frequency displays, if the FTM-400 transferred into cross-band repeater mode.
Exiting Cross-band mode
Turn the FTM-400 off.
Press and hold the lower 3 buttons to the right of the display then press the power button. “X-BAND Repeater” will not be displayed between the upper and lower frequency displays, if the FTM-400 transferred out of cross-band repeater mode.
Return the frequencies to your preferences.
Turn the APRS modem on, if you run APRS.
Thanks to N3FYD, Greg for the link to the YouTube video.
For the YouTube video on this procedure posted by YouTube presenter “216PapaBravo”: