Dr Ronald Stiffler SEC technology

[itsu]

Hmmm,

i used my SA to measure the main peak (13.6Mhz) of the Crystal oscillator using 1 and 5 crystals parallel.

First screenshot is with 1 crystal inserted, second screenshot is with 5 crystals parallel.

I do not see any foul up of the signal like 5 adjacend peaks on the 5 crystal screenshot.
I do see that the signal is higher in frequency (parallel capacitance?) and stronger (sympathetic resonance?) on the 5 crystal screenshot.

I also have some screenshots of a spectrum range overview which shows that the 1x crystal has less stronger
harmonics then the 5x parallel crystal circuit has which seems to confirm Gyula's statement.

For what its worth,   itsu

[gyulasun]

Hi Itsu,

I am mistaken, sorry and the crystals should be so close to each other that they cannot oscillate individually what I thought.  This is what your measurement basically shows, right?  Thanks for checking this.

Maybe you also checked this same at the 5th or say at the 7th harmonic of the 13.56 MHz on the SA? where any difference may manifest at a higher distance on the frequency axis.
I mean if there is a difference of say 70 Hz between two paralleled crystals at 13.56 MHz, then this difference will be 5x or 7x 70 = 350 Hz or 490 Hz which may be already easier to notice IF these two lines exist,  that is.
Suppose IF these two vertical lines existed next to each other with a distance between them being 490 Hz at around 95 MHz, would the SA zoom-in resolution be fine enough to notice it? this can also be a question provided the two lines exist of course.
Will think on this further on. Comments are welcome from anyone of course.

Gyula

[Lidmotor]

I tried an old Dr. Stiffler 'one wire energy transmission' experiment today using my 13.56MHz Crystal Oscillator.  It worked.

https://www.youtube.com/watch?v=3KzctX1oxzE

--Lidmotor

[erfandl]

Hi Erfandl,

Okay, thanks for showing the current measurement results.  As I indicated before I did not blame the validity of your previous measurement on the reducement in input current when using 3 crystals in parallel: with oscillators it is always a good practice to filter the supply rails when measuring DC input current or learn about DC input power.   
So the mistery remains why the input current reduces and the brightness increases.
I think you have a 3rd 1000 uH choke coil available, right? Would you put this 3rd choke in parallel with the collector choke coil ? First do it with a single crystal and watch input current and brightness when you plug in the 3rd choke, then do the same when the 3 crystals are plugged in again. By the way, what is the resistance of such chokes? You can measure it with your digital multimeter when they are not plugged into the circuit.
With the parallel connection of two chokes in the collector I do not expect anything fancy would happen, just a suggestion to learn on its effect if any.  What you found as good by using the Pi filter is now there is no need for the use of the ferrite rod... 

You wrote: "DC DC boost converter pull 3.4 mA from battery !!!"

Would you tell what is the battery voltage you use to drive the boost converter?  And what is the output voltage you set the the converter to?  Just wish to know whether the 3.4 mA is a typo instead of say 34 mA ?

Thanks,  Gyula

Hi gyula. the battery is 3.7 volt and the boost coverter output is 24 volt. today I testing the brightness output with my own LUX meter BH1750 sensor and Blynk app. here the result
also with three crystal LUX is stable ( screenshot test with three crystal )

[itsu]

Hi Itsu,

I am mistaken, sorry and the crystals should be so close to each other that they cannot oscillate individually what I thought.  This is what your measurement basically shows, right?  Thanks for checking this.

Maybe you also checked this same at the 5th or say at the 7th harmonic of the 13.56 MHz on the SA? where any difference may manifest at a higher distance on the frequency axis.
I mean if there is a difference of say 70 Hz between two paralleled crystals at 13.56 MHz, then this difference will be 5x or 7x 70 = 350 Hz or 490 Hz which may be already easier to notice IF these two lines exist,  that is.
Suppose IF these two vertical lines existed next to each other with a distance between them being 490 Hz at around 95 MHz, would the SA zoom-in resolution be fine enough to notice it? this can also be a question provided the two lines exist of course.
Will think on this further on. Comments are welcome from anyone of course.

Gyula

Gyula,

sorry, yes i did take a look to some harmonics (5th, 7th) the same way as the base peak, and also did not notice any difference.

The above screenshot where taken with a frequency span of 306kHz, so at the 7th harmonics i should have seen something i guess.

Below the 2 screenshots from the spectrum overview showing the harmonics with both 1 crystal in and then 5.
Peak 8 is again a strong local  Fm station leaking through.



Itsu