A
Anonymous
Guest
Hi Eric,
Whatever I read has this magical figure of 24-28 turns or a coil of around 300uh. I appreciate that we are involved with near induction fields(and where is that written up!) and not the usual radio transmission theory. But excuse me if I am extremely naive and ask if we can divorce ourselves entirely from such theories - and devote attention to L controlling current rise and C as influencing discharge periods. Are we simply concerned with the swift switching of magnetic energy, and seeking the response from a target responding to illumination by the energy within the transmitted field?
Take me back to step one please -
The coil transmitting the energy into a field is subject to what considerations i.e. what parameters define the efficiency of the transmission coil? High current and low turns pluse what frequency of repeating of excitation, or is it low current and high turns and high frequency of excitation. This figure of 300uh appears almost universal regardless of the frequency or duration of excitation. Why???
Your illustration(greatly appreciated) of SD2200 waveforms displays a surprising slow rise in current. Your comments high-light that the switching times of excitation employed do not allow full current flow to develop. Do you have any thoughts why the designer Bruce Candy followed this course of action - do you follow a similar course of "clipped" excitation yourself - or can you possibly comment on the advantages/disadvantages of utilising such an excitation.
Hurry up and write your book!
regards.
g.
Whatever I read has this magical figure of 24-28 turns or a coil of around 300uh. I appreciate that we are involved with near induction fields(and where is that written up!) and not the usual radio transmission theory. But excuse me if I am extremely naive and ask if we can divorce ourselves entirely from such theories - and devote attention to L controlling current rise and C as influencing discharge periods. Are we simply concerned with the swift switching of magnetic energy, and seeking the response from a target responding to illumination by the energy within the transmitted field?
Take me back to step one please -
The coil transmitting the energy into a field is subject to what considerations i.e. what parameters define the efficiency of the transmission coil? High current and low turns pluse what frequency of repeating of excitation, or is it low current and high turns and high frequency of excitation. This figure of 300uh appears almost universal regardless of the frequency or duration of excitation. Why???
Your illustration(greatly appreciated) of SD2200 waveforms displays a surprising slow rise in current. Your comments high-light that the switching times of excitation employed do not allow full current flow to develop. Do you have any thoughts why the designer Bruce Candy followed this course of action - do you follow a similar course of "clipped" excitation yourself - or can you possibly comment on the advantages/disadvantages of utilising such an excitation.
Hurry up and write your book!
regards.
g.