Author Topic: The VIC with resonant cavity project by Steve..  (Read 81445 times)

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Re: The VIC with resonant cavity project by Steve..
« Reply #312 on: October 12, 2016, 14:57:24 pm »
There's more than one type of impedance matching component.  The audio output transformer in an amplifier uses the resistance of the primary and secondary windings to couple the impedance of the amp to that of the speaker's voice coil.  With a TV, the 75 ohms from the coax is converted to 300 ohms, to feed the tuner.  I opened one of those little boxes up and all it has is a tiny torroid with one and a half turns of very small wire, as well as a very little capacitor.  This looks a lot like the resonant choke shown in Meyer's diagrams.  Is it possible that this is actually an impedance matching circuit, which also needs to be included  along with the actual bifilar chokes?


The VIC is a simple powersupply hooked up to a LCR circuit.
The question is how to get the power tranferred from supply to load.
Under resonance, the DC resistance is left over from the LCR components.

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Re: The VIC with resonant cavity project by Steve..
« Reply #313 on: October 12, 2016, 15:02:57 pm »
Is it not funny that you talk about 75 ohm for antenna impedance?
The secondairy is around 70 ohms; the two chokes also a bit around the 70 ohms and then the waterbath also a 78 ohms....
Now which parts are part of the powesupply and which parts are part of the LCR load?
Hint: just puzzle a bit...
Look for an honest balance.
Impedance balance of components who have DC resistances that should be in balance for ideal matching...

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Re: The VIC with resonant cavity project by Steve..
« Reply #314 on: October 13, 2016, 02:28:11 am »

you can check out aerial info on the web

free space impedance is 377 ohms ,  120 x pi .         78.54 ohms is 25 x pi

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Re: The VIC with resonant cavity project by Steve..
« Reply #315 on: October 15, 2016, 06:58:09 am »
There's more than one type of impedance matching component.  The audio output transformer in an amplifier uses the resistance of the primary and secondary windings to couple the impedance of the amp to that of the speaker's voice coil.  With a TV, the 75 ohms from the coax is converted to 300 ohms, to feed the tuner.  I opened one of those little boxes up and all it has is a tiny torroid with one and a half turns of very small wire, as well as a very little capacitor.  This looks a lot like the resonant choke shown in Meyer's diagrams.  Is it possible that this is actually an impedance matching circuit, which also needs to be included  along with the actual bifilar chokes?

This makes much sense in terms of history of the process.... Puharich stated in his circuit patent an additional 2mH coil may be required.

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Re: The VIC with resonant cavity project by Steve..
« Reply #317 on: October 16, 2016, 08:40:04 am »
http://m.electronicdesign.com/communications/back-basics-impedance-matching-part-1

I googled this and found some interesting stuff:

The Determination of the Electrical Conductivities of Some Concentrated Electrolyte Solutions Using a Transformer Bridge

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Re: The VIC with resonant cavity project by Steve..
« Reply #318 on: October 19, 2016, 07:19:55 am »
a view on Meyers driver circuit for the primary coil.
Ask yourself why he made it like this....


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Re: The VIC with resonant cavity project by Steve..
« Reply #319 on: October 19, 2016, 13:55:27 pm »
Just thought i would share a scope shot.