The upper-frequency limit for Contact Mode is limited to the frequency generator being able to sustain a high enough output voltage to overcome skin/tissue/TENS pad resistance to provide sufficient current to provide an effective treatment. The higher you go up in the MHz frequency range, the more cable length, wire/cable type characteristics, and impedance matching affect signal quality.
XM generator has a 5MHz frequency limit. Higher frequencies can be reached using Spooky2 wave cycle multiplier function.
GX/Pro generator has a 40MHz upper frequency limit. Higher frequencies can be reached using Spooky2 wave cycle multiplier function.
For more details, please check the link:
https://www.spooky2.com/forums/viewtopic.phpf=12&t=14713&sid=7737c8b378bd1ef75deb4a2a2654cd74
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