Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

As an (inactive) HAM radio amateur i struggled with standing waves on coax many times (to get them go away :-) )

Unlike with HAM transmitters and antennas, with this Dally device you have to maximize the VSWR by mismatching the coxial terminating impedance as much as possible - that's why I wrote: "shorted or opened".  (BTW: Tesla Coils have the same requirement).

This means that for my shorted 41 turns coax coil of 6 meters length i have to have a node every 14.6cm (6/41).
Having 2 nodes/wavelength, this means a wavelength of 29.2cm = 1GHz.   Correct?

Almost. You are forgetting that at 1GHz the full wavelength in your coax is not 29.98cm but 19.79cm because the velocity factor of your coax is most likely 66% of the speed of light.

That's the theory, but in practice it would be good if you could visualize the standing wave in the coax with a linear array of small cheap neon bulbs (e.g. NE2) working according to this principle or a capacitively coupled oscilloscope probe like that Cortland guy.

[itsu]

Verpies,

Almost.

Right, as my coax is 75Ohm with foam PE isolation, its velocity factor is 78%.

@ all,

i am also following this (by Google automatically translated) Russian website which has tons of info, pictures and diagrams:

http://www.translate.google.lt/translate?sl=auto&tl=en&js=n&prev=_t&hl=lt&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Frealstrannik.ru%2Fforum%2F44-freeenergylt%2F81742-dally-ustanovka-free-energy.html

Regards Itsu 

[verpies]

Attached is an old military document but very applicable to building stronger pulse generators out of multiple avalanching transistors.
Contemporary transistors are much faster than the ones available when this document was written.

[verpies]

For comparison here are the State of the Art, commercial picosecond pulsers available today.
Pay attention to the max amplitudes.

Note that in the avalanche transistor pulsers, the Charging Capacitor can be replaced by the capacitance of the Coaxial Cable itself (see Pg.4).  In that case the resulting pulse can be made rectangular.
Such "capacitorless" avalanche pulser is depicted here.

[Pinoy_Tech]

All,

Concerning the main generator (4.6Khz) toroid, i found this diagram which contains some data on it:

http://realstrannik.ru/media/kunena/attachments/1226/dally1.GIF

meaning:

Ferrite Ring probably 4cm od

Windings 1 and 2 are  3 turns 1.5mm
Windings 3 and 4 are 70 turns 0.6mm

But looking at the original pictures like Hoppy already mentioned, this does looks more like a commercial
toroid with much more wire on it.

While waiting on my parts to arrive, i was experimenting with a toroid i had laying around, see picture
(2 turns primary / 40 turns secondary), but was blowing up my MOSFET driver chips 4420 (MOSFETS IRF630) :-)

Questions:

# these 3 (or 2 turn) primary, act like a short to the MOSFET's, right?  Should there not be much more turns?
# these primaries (1a and 1b) should be CW and CCW, to work in this push/pull configuration, right?
# the secondaries (ii and iii) can be either CW or CCW, right?

Thanks,  Regards Itsu

My expectation to the ferrite ring size is about 6cm od. BTW regarding 494 pwm IC, ' been playing on similar circuit for quite sometime... An hour ago, I tried to test with similar filter coil like what you have shown but can't get a good result with that kind of coil. I think the material used in those kind of filter coils does not much with the frequency or something else. I too have blown my mosfet while my modulator is already tested with my other known good trafos. In my personal practice, cannibalized pc psu main trafo is one of the bests for quick & easy testing if your 494 ckt is working good or not, but prior to that, waveform reading will help a lot.
   
About Dally's circuit, I'm just wondering about rectifiers used at the outputs. It appears that those bridge diodes are not fast recovery type... Can somebody verify that?       

Attached are my sample tests with my upc494 generator ...