Confirmation of OU devices and claims

[seaad]

Hi ITSU
In your two latest videos I found you perhaps made a small fault when you connected the very high Ohm probes direct to the series resonant circuits whithout a load resistor and got a resonance around 3,5 Mc.
Actually you are only using the L:s in practice then.
With series resonant circuits you have to use a low Ohm resistor (50 Ohm?) to manitan the resonance at 193 kc and put your probes across that (L-C-R).
It's nice to follow your reseach here in the summer-part of the globe. I'm not testing now at this time in the year only cheats as a gardener at home.

Regards Arne

[a.king21]

Just a reminder:  This video still makes me smile so here is a still from it. It is self explanatory.


https://www.youtube.com/watch?v=tpoOWs8SfVo

[gyulasun]

Hi Itsu,

I agree with seaad.  The 10:1 scope probe input capacitance (13-15 pF) was also in series with
the 5 nF tuning cap. This is why the frequency of the series LC went up, the 5 nF has become
quasi a short circuit at 3.5 MHz, the tuning cap was the probe input capacitance.  You can check
this with an online LC resonant tank calculator, using say 13 pF for C in the Thomson formula.
(The 10 MOhm probe resistance was an open circuit.)   

Yes, for the receiving, the parallel LC circuits are to be used, for transmitting the series LC circuit
is to be used in such setups. Thanks for the videos. 

To explore the answer for an earlier phenomena you found  i.e. when you put the middle coil onto
the top of the outermost coil and the LED became lit across the latter, why it may have been?
Probably doing field strength indications by a probe coil and a small power LED at the same distance
from the TX coil the two vertically stacked coil were positioned would reveal an answer. 

Gyula

[gyulasun]

A.king, 

Please try to modify the picture horizontal pixel number from 1366 x 768  to max 900 x 768 so that
the horizontal width of this thread in this page should return to the normal size. 
You can use any picture editor like Windows Paint and reupload your picture. 
This way most of the readers here would not need to scroll from left to right to read each line in the text.

Thanks.

Gyula

[a.king21]

Coils at all angles.  ha ha lol