Giantkiller moves forward into Full Heterodyning.

[innovation_station]

 

hey gk

or the polar oppsitte no? lol     orieo cookie 

so a friend of mine droped by last  night  an old hippy from way back ....   and he brought with him a verry nice old book to show me some things here is the  library of congress catalog card number 67-27972

it is an illustrated encyclopedia of technology from 1963 republished in 1967 verry intersting to say the least.....

ist

[aleks]

So this post sequence was very important. I am staring at my notched pvc coil. I believe the Helmholtz coils were to be of iron instead of copper.

Just to re-iterate... (hope I've got it right)

If I'm not mistaken, instead of saw-tooth pulses (which could be optimal IMO), you can use varying duty-cycle PWM. E.g. tuning the PWM to 5kHz while setting the duty cycle to 5%. If core's induction frequency response is "slow" (e.g. cutoff at 3kHz), such mode of pulsing should add energy to core with each pulse up to saturation. Probably iron is better than copper because its induction is "slow". It cut offs all high frequencies you put into pulse (this energy goes into seemingly a loss) and so its "background" (back) EMF mainly consists of low frequencies. With each pulse you'll just add a new portion of energy to this background EMF thus increasing the field. Chokes are low-pass filters after all!

This corresponds to SM's comments discussed on another thread here, where SM says that after enabling DC current you should immediately shut it off. The frequency of pulsing is not discussed, but even such information gives a clue that it should be varying duty-cycle PWM. Plus we know for sure that spark gap "shuts off" right after firing through the air gap. So, this also corresponds to SM's vision.

So, I remember a talk about "iron wire" whose length should be changed to "make things work". Everybody knows that wires have a "bandwidth". If a wire is very bad at that (iron wire is an example), it will work as a kind of a choke that removes higher frequencies. It is by no means a delay, but you should know that any low-pass filtering gives a rise to Gibbs' oscillations: this is where delay shows itself. The longer the wire, the lower the cut off frequency and thus Gibbs oscillations become longer. And so, if you fire a pulse faster than Gibbs' oscillation settles down, the overall magnitude of the oscillation will rise. It is this oscillation that pulsing can act upon and interact with.

[sparks]

  @ Alecks

      The iron needs to be outside of the influence of the kick windings. NOT IN THE CORE> that is where the collector is.  The hf will travel along the skin of the kick windings doing it's thing.  We don't want the pulse to get screwedup with iron in the core of the torroid.  Otherwise you just made yourself a frigging choke for your kick.  The pulse navigates the torroid until it gets to the stop winding which chokes it's energy.  You feed a signal from this stop coil to your oscillator, phase displaced depending on the permeability of the kick windings and the amount of power you want to regulate.   This gives time for the iron to transfer it's captured energy into the copper of the kick windings. Then pull the trigger and do it again.

[innovation_station]

@sparks

it all depends on the design........


i have many motors or turbines with coper and iron or steel as a core

but agin i know what your saying 

ist

[innovation_station]

oops dubble