I suspect you meant 100kHz rather than 100MHz ?
Nope, in fact it was able to read frequencies upo to 100 Mhz, and the resolution was 1 or 0.5 Hz; it was crystal controlled, thermally balanced, and calibrated in my high school lab; I spent less than 20 euros to build it, and it was small like a cell phone; in comparison the frequency counters of our high school labs was huge, expensive (1-2'000 euros) and can't be programmed (with mine you was able to store frequencies and do addition and subtraction).
I can understand that it isn't a practical solution. I thought about a servo, with a PID algorithm, but I know that there are problems with resolutions as high (4096 bit per revolution) - I know that due to gears backlash the last openservo attempt has serious problems and oscillates. And the holding will be also an issue.
Now I'm considering a reduction gearbox with anti-backlash gears (certain solutions can be very cheap), but I hope I can achieve this only with four gears (so two anti-backlash) so I can have a 8:1 ratio or so, and to achieve a 4096 resolution I need 512 step. And this still retaining 1 Nm of torque at 240 rpm...
The half-stepping will result in half the holding torque? ANd the microstepping of n times will cause n times loss of torque?
Also, can you address me to some knowledge articles about half-stepping, microstepping and etc.?