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[Mk1]

I am sorry i do not have enough time to moderate any threads.

You can always start with these two elements:

Bring them close togheter play with it ,and think about the up side down issue.
Introduce other metals and think about why it detunes the device.
Also OTTO think about your core!!!

The ferrite rod antenna concentrates the magnetic component of radio waves.
But it also concentrates the earths field...It makes visible what it realy looks like, and that isn't what a compass shows, at all..

This is simple stuff let me know what you find, then we can compare our results.

Marco.

Image Source:
http://www.radio-electronics.com/info/antennas/ferrite_rod_antenna/ferrite_rod_antenna.php
http://commons.wikimedia.org/wiki/File:Ferrite_antenna.jpg

@marco

Are you really saying what i think ...

The compass dose show a constant field , we all live in that field so everything should be contained within a directional field , that field kicks back when under electrical/magnetic stress ...

If we have a constant directional field we should have direction in current  too ...

[Grumpy]

momentary angular movement of a few degrees - ccw - northern hemisphere

everything vertical

pretty sure it is only during the change, and this would be expected

(used a 3/8" bolt as I do not have a suitable ferrite)

     

[EMdevices]

guys, would something like this work?

Use a magnet instead of a ferrite, the reason being that its magnetic domains are already saturated and aligned, and so it will act as a nonlinear device, and MIX two different frequencies.

The external frequency is 5 kHz  (from the earth, power lines, radio tower, etc.....)
The driving frequency is 20 kHz   (simple timer driving MOSFET, with some zener protection)
The output is the resonant tank tuned to 25 kHz,

Since the core is nonlinear (magnet)  it will mix 5 and 20 kHz to produce 15 and 25 kHz, but the output tank is tuned to 25 kHz, so this is the only frequency that will be amplified and highly resonant.   It's output power should be more than what we put in due to the external contribution.

Just throwing out ideas, sorry if I'm off topic.

EM

P.S.  Or maybe a bias magnet/ferrite arrangement will give us that nonlinear core that we need here. (see second picture)

[EMdevices]

wow, this info is dynamite, look at this link,  this has to be what is occurring in the TPUs, this could be the high Q method that is being implemented.  The collector wires have to be magnetostrictive (nickel perhaps?, iron?) I wish SM would confirm for sure what those wires are made of.  Even the topology of using two coils  (transmitter and receiver) could make sense in his TPUs.  Hmm, I need to explore these concepts some more, time to take out the tool box again.

http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/anti-shoplifting-device5.htm

AM material is highly magnetostrictive, which means that when you put the tag material in a magnetic field, it physically shrinks. The higher the magnetic field strength the smaller the metal becomes. The metal actually shrinks about one-thousandth of an inch over its full 1.50 inch length.

As a result of driving the tag with a magnetic field, the tag is physically getting smaller and larger. So if it is driven at a mechanically resonant frequency, it works like a tuning fork, absorbing energy and beginning to ring.

This tag also requires bias magnet material in addition to active element material. The active material will shrink no matter which direction the magnetic field is placed upon it. If the tag is driven with Frequency, F, it gets smaller as the magnetic field increases and larger as it's driven towards zero. This means that while it is being driven at F, the tag is trying to work at 2F, because at both positive and negative halves of the drive signal, the tag is getting smaller. To get the tag to work at F, a bias field is required. The bias is provided by a semi-hard magnetic element in the label. When magnetized, the bias prevents the active element from ever being in a zero field condition. So for an entire half of the drive signal, the tag shrinks. Then it expands for the other half. This results in an F response.

EM

[BEP]

@EM

I have no doubt magnetostriction plays a part in a TPU. There is a very good chance this part is key.

Please do remember that one important key about a magnetostrictive oscillator is the fact that the main resonant frequency is that of the core material, not the coils or tanks surrounding it.

This can easily put you into the very low frequencies. Also, if this deformation is going around in a circle there is a better chance you can amplify it. Talk about the frequencies being dependent upon the circumference!