There seems to be no shortage of frequencies around including the CAFL etc.
BTW: The F165 setup with 20Mhz carrier and using the harmonics as per the NCFL (hulda translation) where I now use the Euler's Constant to the 6th power as a back frequency.
An example:
Channel A: 1407.93
Channel B: 568000 via vbackfreq b 403.428794865 1 62
Channel C: 20Mhz
This all makes me wonder what additonal benefits there would be with the F170.