Tarsos detector vlf turkey

[Qiaozhi]

oh bad mistake
any way; again:

10'' coil:
Tx=60 turn of .25 mm wire = .176mH
RX=90 turn of .25mm wire = .375mH

and for 20'' coil:
Tx= 38 turn of .25mm wire= .176mH
Rx= 57 turn of .25mm wire= .379mH

TRUE?!!

Your calculations are still incorrect.
For a 10" diameter coil (127mm radius) with 60 turns of 0.25mm wire, the inductance should be 2.937mH.

[dfbowers]

Hi Don
thanks a lot.
kt316=2n4920
kt817=2n4923
kt315= cant find it, please help
what is this? ((Tx coil = 2.5 nF Rx coil = 5 nF)) since the calculate software dont need those!!!?
please see the image, is it true for 20'' DD coil?!
RX=14.128mH
tx=6.87mH

KT315 = BC146

http://matthieu.benoit.free.fr/cross/russian_equiv.htm

[mehdi]

Hi
for 20'' coil:
RX = 59 turn of .25mm wire
TX = 39 turn of .25mm wire
i hope that this one is true!!

[Qiaozhi]

Hi
for 20'' coil:
RX = 59 turn of .25mm wire
TX = 39 turn of .25mm wire
i hope that this one is true!!

I don't know what you're doing wrong with the calculator, but for a 20" diameter coil, and using dfbower's inductance values:
TX -> N=36, L=2.5mH
RX -> N=52, L=5.0mH

If these windings are for an OO coil, then the number of turns are correct, but for a DD coil you will need to fudge the results to compensate for the different coil shape.

[mehdi]

thank you so much Qiaozhi
i will do that.
remission for my bother.
mehdi

[dfbowers]

I don't know what you're doing wrong with the calculator, but for a 20" diameter coil, and using dfbower's inductance values:
TX -> N=36, L=2.5mH
RX -> N=52, L=5.0mH

If these windings are for an OO coil, then the number of turns are correct, but for a DD coil you will need to fudge the results to compensate for the different coil shape.

That might be why my inductances and number of turns are off a little.

Mehdi, you might want to contact KT315 as the Volksturm is his design.
But, I don't think that the inductance values are that critical though as long as you can tune your Rx coil to around 8kHz

[lonelyWOLF]

Hi. here the most recent tarsos ..watch it

http://www.dailymotion.com/video/xh2...00-desygn_tech

[silver]

Hi. here the most recent tarsos ..watch it

http://www.dailymotion.com/video/xh2...00-desygn_tech

Hi
can you upload here since i cant open this link.
thanks a lot lonelyWOLF

[Qiaozhi]

Hi. here the most recent tarsos ..watch it

http://www.dailymotion.com/video/xh2...00-desygn_tech

The video worked fine for me.
Please can you post a close up image of the control panel?

[mehdi]

Hi Don
i want to contact KT315 but he dont reply to me!!
btw, i am going ahead... .
regards
mehdi

[dfbowers]

Hi. here the most recent tarsos ..watch it

http://www.dailymotion.com/video/xh2...00-desygn_tech

The video looks very impressive. It does perform very well on the workbench too!
I'm wondering if the key feature of the design is the "autotransformer" arrangement in the oscillator. 100 + volts across the coil!

I think I built 2 of them at one time and my son built one. I put it away though when I found that it wasn't too practical for use outdoors. Single channel means no ground balance and had some stability issues. Other than that it was fun to build.

Do you know if anyone has played around any upgrades to the project? Maybe a GB channel?

I would be more impressed if the video showed rejecting ferrite, rejecting iron and accepting non- ferrous metals with changing any settings.

[porkluvr]

A 20" diameter coil is 508mm in metric. This means the coil radius is 254mm not 500mm, as you have entered in the dialog box.

Qiaozhi,
When you ask for wire thickness in your Coil Calculator program, do you intend for that entry to be conductor thickness, OR, don't you expect for the entry to be overall diameter such as conductor thickness plus 2x insulation thickness?

[Qiaozhi]

Qiaozhi,
When you ask for wire thickness in your Coil Calculator program, do you intend for that entry to be conductor thickness, OR, don't you expect for the entry to be overall diameter such as conductor thickness plus 2x insulation thickness?

The calculator assumes you are using enameled copper wire. It does not have the capability for the user to enter the insulation thickness between individual windings. In practice there are many factors that can cause a difference between the calculated inductance and the final value. Although the insulation thickness is one factor, this is minimal when compared to discrepancies in coil shape, inner radius and the way the bundle is tightened. At the end of the day, the calculator is just a tool to get you into the right ballpark. Often you have to either add or remove a few turns, but generally the prediction is quite accurate.

[alnamr]

hi dfbowers

how are u?

I've built and one Turkish, but does not work the sound cluttered What Is transistors bc337-040??
Is it copper file 0 \ 3 mm????

[dfbowers]

how are u?

I've built and one Turkish, but does not work the sound cluttered What Is transistors bc337-040??
Is it copper file 0 \ 3 mm????

Hello, Alnamr.

What did you build? Can you please ask your questions again?
Please try to translate your question using:


http://babelfish.yahoo.com/

Don