Well first of all, its running at 11.7XX khz not 12.000 khz (assuming no frequency shift is applied) and second, the XX of each of my coils is different and this is true for all the operating frequencies. If you have multiple coils check it out. Andy pointed this out in class. When I electronically switch coils they will briefly initialize at 17.6xx khz for less than 1 sec then switch to the operating frequency of the program I am using if its not 17.6 khz (18 khz). Though different for each coil the 11.7XX (or 7.8XX, 4.0XX, 17.6XX as the case may be) base operating frequency is constant for a given coil seral number and only changes if I apply a frequency shift in the expert menu, a feature I never use because it locks you in to tx3.