Troy Shadow X3 ground balance question

[ivconic]

All right, I know now that I could have a try with CZ coil or build a new one. And I like the second option. But as I mentioned before, don't have too much knowledge. I browsed archive and couldn't find proper info how to measure inductance and all that stuff. Actually that's the thing which I really miss here, a step by step guides how to's for not so experienced users. So, any help will be much appreciated.

Easy! For a start you should obtain something like this:

http://tecpel.en.alibaba.com/product/319546056-200262840/lcr_meter_Digital_Multimeters_DMM_8007.html

There are cheaper too on market. Important for you is that it must have inductance meter included.

[m23585]

Will get a proper one then.

[ivconic]

Coil as coil... same approach for making any coil.
Same precautions, same rules, except the exact data for each coil itself.
I tried to make document with simplest explanation possible, on coil making.
At the time it was coil for TGSL.
You can read it, watch the photos and apply same method when making your own coil for X3, EXCEPT that you will have to obey given data for X3 coil.
You have proper data on posted scan above.
Make DD type of coil for X3.
Pick ... let's say 0.5mm wire for TX and 0.22-0.25mm for RX.
Make a former and wound "testing" windings, let's say 40-45 with 0.5mm wire. Than measure inductance and resistance.
Try to correct number of windings to get closest matching to original resistance and inductance of X3 coil.
If you can't; than try different wire gauge, let's say 0.45 or 0.4mm.
Once you get closest possible match to original X3 TX coil you can start making the RX coil.
Repeat the method until you achieve closest match to original X3 RX coil.
Than make shield (described in PDF article) and do the coil balance...etc...etc...
First look for PDF article here:

http://www.geotech1.com/forums/showthread.php?15710-TGSL-Complete-Details

[ivconic]

Practically, you are trying to achieve:

1.13mH/5 ohms for TX and
6.7mH/35 ohms for RX

You don't exactly have to achieve exact numbers, but also do try not to jitter much away from original values.

[m23585]

ivconic, in one of the topics you mentioned that you have (or had) Fisher 1280X. Did you measure the coil, do you think it could fit X3?

[Dave J.]

Do i see some hidden critics here or what?
Nobody ever even dared to think to understand the circuit better than the original engineer; nor ever intended to say something like that, God no!
This is a forum for such kind of talks, we are enthusiasts here, the hobbyists, and we usually do like to investigate bit more behind the "curtains" of md engineer secrets.
Your job is to hide - our job is to search for!

Sorry, I was pissed off at doctors and politicians and my bad attitude inadvertently spilled onto this forum.

--Dave J.

[kt315]

ivconic, in one of the topics you mentioned that you have (or had) Fisher 1280X. Did you measure the coil, do you think it could fit X3?

1280X' operating freq is 2.4 kHz... very low freq... troy X5 freq is 18.55-18.85kHz... but try anyway... try and let us to know your expirience... this will be add in DVD archive...

[ivconic]

Sorry, I was pissed off at doctors and politicians and my bad attitude inadvertently spilled onto this forum.

--Dave J.

Story of my life!
I can't help it; most often my personal life and emotions do reflects here on forum too.

[ivconic]

1280X' operating freq is 2.4 kHz... very low freq... troy X5 freq is 18.55-18.85kHz... but try anyway... try and let us to know your expirience... this will be add in DVD archive...

Correct!
Huuuhhh i can't recall it correctly; but as i remember 1280 coil is quite much different.
Forget it.

[Dave J.]

Ain't no way a 1280X searchcoil is going to work worth a darn on anything other than a 1280X.

Of searchcoils you can buy new off the shelf, the Teknetics "frat brothers" DD's are probably the best electrical match to the Troy X3/5. However, you'll have to rewire the searchcoil connector for the Switchcraft cable plug. ......Please note that I make no representation that anyone who does this will be happy with the results, nor do I have the time to step someone through the conversion who can't figure it out on their own.

Other possibilities include searchcoils for the Fisher CZ's, and the Tesoro Lobo Supertraq. The White's MXT searchcoils might be adaptable but would probably require additional resonating capacitance in the transmit circuit. Again, caveat emptor and caveat lector: no representation is made that you'll end up happy, only that these are more promising choices for experimentation than most other searchcoils.


--Dave J.

[m23585]

I see. I guess better to make a coil by myself. That will teach me something new. Thanks a lot for your help. Regards

Greg

[kt315]

The White's MXT searchcoils might be adaptable but would probably require additional resonating capacitance in the transmit circuit.

no need require additional resonating capacitance in the transmit circuit, Dave. the TX in troy is specific... not ordinary and not standart, as you can see in another simple VLFs... may be there is a serial resonance. I do not know... but primary LC contour of parallel voltage resonance is set on PCB, secondary you can see a serial current resonance LC contour, THE coil itself, if there is yet this current resonance... so, from that, in my opinion, the topickiller has to find out coils with 1-1,2mH TX winding, connect and research its on depth.
this pic is of MRAND, I hope he will follow my speach by something he considers to be need...

[ivconic]

[ivconic]

no need require additional resonating capacitance in the transmit circuit, Dave. the TX in troy is specific... not ordinary and not standart, as you can see ...
[ATTACH]26799[/ATTACH]

Oooooahahahahahahahahaahhaahahah!
How about that!?

Dear KT315 please read this:

http://www.tekneticst2.com/tekfiles/davejohnsonjohngardinerinterview.htm

[ivconic]

If it works, and if you understand the circuit better than the original engineer did, then go ahead and fix it. Otherwise be glad it works, enjoy the product, and spend your time doing something constructive with things you actually do understand.

--Dave J.

Somebody please HELP ME!