Search Coil for Project's

[amtech2005]

Here is just a little information , to help this new thread Get Started !!

Model , Frequency , Coil that was included with Detector

1. Golden Sabre ,12 khz ,8 inch concentric
2. Golden Sabre II ,12 khz ,8 inch concentric
3. Golden Sabre plus ,15 khz, 8 inch concentric
4. Silver Sabre ,12 khz ,7 inch concentric
5. Silver Sabre II ,12 khz ,8 inch concentric
6. Silver Sabre plus ,12 khz ,8 inch concentric
7. Tesoro Royal Sabre ,12 khz ,8 inch concentric
8. Tesoro Euro Sabre ,10.6 khz, 9 by 8 inch "Sinusoidal"
9. Eldorado "Metal Case Housing" ,10 khz ,8.5 inch concentric
10. Eldorado "Plastic Case Housing" ,10.2,10.4,10.6 khz ,9 by 8 inch "Sinusoidal"
The next post on this thread will be the Recomended Search Coil's for Ivconics...."Tesoro Golden Sabre Lite-1265" project................Eugene

[amtech2005]

Search Coil for Project's

I am now searching through a Library of thread's . So here are just a couple of items to prepare for my next posting on this New Coil Thread . Some small photos of Tesoro search-coils , which I am sure "Everyone" is familiar with. And a little chart below , which was posted by another Geotech Member several month's ago , with some Great information !!! The top left is the 7 inch concentric , the top right is the 8 inch concentric , the bottom left is the 11 inch wide-scan "double D configuration" and the bottom right is the 9 by 8 inch "Sinusoidal coil" which was designed to reduce harmonics .........................Eugene

[simonbaker]

Does anyone know what is inside the 9 x 8 sinusoidal coil? What is the very small inner circle?

[Qiaozhi]

Does anyone know what is inside the 9 x 8 sinusoidal coil? What is the very small inner circle?

It's a concentric. The inner circle is the receive coil.

[Mrand]

Tesoro 8x9" inside (for Tejon)
TX coil - inner diam. 201 x 229 x 3.5mm - 950uH / 4.3ohm
RX coil - inner diam. 66 x 85 x 4mm - 15.8mH / 63.5ohm
Mrand

[Aziz]

Tesoro 8x9" inside (for Tejon)
TX coil - inner diam. 201 x 229 x 3.5mm - 950uH / 4.3ohm
RX coil - inner diam. 66 x 85 x 4mm - 15.8mH / 63.5ohm
Mrand

Hi to all,

one can see on the inner coil the bucking coil and receive coil connections (wires). The thicker coil connections on top is the bucking coil and the thinner bottoms are receive coil connections. All concentric IB coils need a bucking coil. Mostly, they have same diameter of the receive coil (as in the x-ray coil picture). The transmit and bucking coil wire has same diameter thus same electric resistance per meter.

Very interesting x-ray picture. Thanks to Mrand.

Aziz

[simonbaker]

Fantastic! Now I have to think how size of receive coil affects depth, and what would happen if the coils were reversed. (is there a reciprosity theory that says it's the same...)

[Max]

Tesoro 8x9" inside (for Tejon)
TX coil - inner diam. 201 x 229 x 3.5mm - 950uH / 4.3ohm
RX coil - inner diam. 66 x 85 x 4mm - 15.8mH / 63.5ohm
Mrand

Hi,
this is really an interesting picture: the Tejon coil is not like in TGS cause inductances are different but I think the construction is , for other stuff, really close to the other 9x8'' (the white , for old uMax).

I can see clear the RX coil leads (thin wires), the bucking coil soldered to the main outer TX and the heat srinking tubes at connections with cable.

Also, MORE IMPORTANT, I cannot see any center tap...evidence there! Just I see the unusual shield connections ...2 of them around the main TX coil but NOT at RX ???

That's really strange... but I think there's a trick...cause maybe the RX part, smaller oval at center is coated with some conductive paint.
Anyone knows about?

Kind regards,
Max

[nakky]

Grt Nakky.

[Max]

Grt Nakky.

Hi,
another interesting thing is that seems there isn't a real lose loop... used for nulling!

Just a little more on tx-bucking coil connection side... but that's maybe enough for nulling.

I think their nulling is not so good cause of that!

I mean... they don't null at 1mV but fairly more.

Maybe the graphite shield overcome to the problem... and coils appear to be stable on soil.

Kind regards,
Max

[Mrand]

I saw this probe exactly. She is done in such a way:
1. The case is painted inside with the graphite paint.
2. Windings are puting inside. They are glued tentatively with hot glue.
3. The probe is being very exactly zeroed by the change of the position of the Rx coil.
4. Windings are being flooded with the very hard resin for the 2/3 height.
5. The resin is being painted with the graphite paint. The paint is connected with the paint on the resin on the case. This giving full closure of the screen.
6. The case is being flooded to the full height with the black flexible resin.
In this way the probe is ready for the use.
In my opinion so is the manufacturing process, but I'm able to be mistaken.
Mrand

[Max]

I saw this probe exactly. She is done in such a way:
1. The case is painted inside with the graphite paint.
2. Windings are puting inside. They are glued tentatively with hot glue.
3. The probe is being very exactly zeroed by the change of the position of the Rx coil.
4. Windings are being flooded with the very hard resin for the 2/3 height.
5. The resin is being painted with the graphite paint. The paint is connected with the paint on the resin on the case. This giving full closure of the screen.
6. The case is being flooded to the full height with the black flexible resin.
In this way the probe is ready for the use.
In my opinion so is the manufacturing process, but I'm able to be mistaken.
Mrand

Hi,
I agree... seems the right procedure considering what they use.

Kind regards,
Max

[Tinkerer]

Concentric Induction Balanced coils for PI

Are there any commercial PI-MD's that use concentric induction balanced coils?

Tinkerer

[Esteban]

Are there any commercial PI-MD's that use concentric induction balanced coils?

Tinkerer

Sasho from Bulgaria has posted discriminative IB/PI but no concentric.

[Max]

Are there any commercial PI-MD's that use concentric induction balanced coils?

Tinkerer

Hi,
I thing the question is wrong... cause IB issues are not so relevant topic when talking about PI coils.

I mean, there are concentric coils for PI, T-R design using e.g. a larger TX coil and inner RX (like in AN-PSS12) but they are not IB , looking at details.

They e.g. don't require such an accurate nulling procedure that VLF/IB coils require... PI coils are not IB basically... cause don't require perfect balance.

They e.g. have no bucking coils in most of the cases: just 2 coils , one for RX one for TX and being concentric coplanar...

So "IB" stuff has not much to do with PI technology...

Better to talk about T-R coil configuration: mostly employed to gain better pinpointing.

Kind regards,
Max