WHITES DUAL FIELD COIL

[daverave]

what swg gauge wire did you use for your coil ???? also did you wind both coils separately and then connect them together in series ????

[Jose]

what swg gauge wire did you use for your coil ???? also did you wind both coils separately and then connect them together in series ????

The cable used is Cat 6 for computer network can also be used Cat5.
They are two separate coils, with the same number of turns connected in series.
Jose

[Aziz]

triple field coil of Aziz still is not patented by Minelab. http://www.geotech1.com/forums/showt...ght=Dual+Field

Fact: It's prior art now.

Joke: *****

Aziz

[daverave]

whats the inductance and resistance of your dual field coil ?????....surely the small coil would have more turns than the larger coil.

[Jose]

whats the inductance and resistance of your dual field coil ?????....surely the small coil would have more turns than the larger coil.

Daverave
If you look at the diagram above, the total inductance is 380 uH, and the resistance is 2 ohms.
The inductance of the coil of a smaller diameter is smaller than the larger coil. Both coils have the same number of turns.
In fact, tests performed Aziz graphics mono coil, of one, two and three coils and in all cases the individual coils, have same number of turns.
Jose

[daverave]

is it ok for me to use 30 swg copper wire...cause the resistance is going to be around 5 ohms at around 380 uH....should i use thicker gauge ??? teflon multi strand wire is not easy to get here in the uk and when i look on ebay im a bit confused as to which teflon wire gauge i should choose and most advertised are like short lengths...can you pls advise ???

[daverave]

im a bit confused about this cat 6 cable...i looked on ebay and it looks very chunky cable...whats the advantage of this cable ???? will 16 turns of this fit into coil shell ????

[Jose]

im a bit confused about this cat 6 cable...i looked on ebay and it looks very chunky cable...whats the advantage of this cable ???? will 16 turns of this fit into coil shell ????

The cable used is Cat 6 or Cat 5.
This cable is used for data transmission, is composed of 8 conductors of 0.5 mm in diameter, in the case of Cat 6 the diameter is slightly larger, between 0.5 and 0.6 mm.
Another may use this cable between these values (0.5 or 0.6 mm) corresponding to 23 or 25 swg of acuero to the table.
The blindage we perform with Scotch tape No. 24.
In the image below is an example of a mono coil.
Jose

[kt315]

did anybody open this coil and has measured L of windings and damping resistors' value? daverave is looking for real data, not a fantazy.

[bernte_one]

i am not sure if the original whites dual field
is really a dual tx coil (two coils in serie)

at the surf pi it is possible to separate tx and rx stage to receive lowest pulsedelay timing
if we could see the original connector plug we can discuss more

if there are 2 pins or 3 it is a simple coil
if there are more as three pins it could be a separated rx/tx configuration

regards

[kt315]

on a photo above I uploaded you can see clearly one strande shielded cable and no connector used. a cable is connected directly to PCB.

[daverave]

i have to admit that the whites coil looks very impressive....thanks for the photos mate kt315.

[daverave]

im still very unsure about the construction of this dual field coil....what gauge and type of wire do i use ???? when i start to wind the coil around the nails of the 12" size...when ive completed one turn do i then wind one turn around the 6" size then back to the 12" then do this over and over again until the correct number of turns is completed ???? or wind coils separately ???? im just not clear in my head on this process.

[kt315]

wind coils separately. have to put a damping resistor to inner coil (according to the patent). as second dumping resistor has set at PCB, so no need to add this second resistor in a coil.

[WM6]

Separetely windings and serial connected between each other.