Aluminium search coil

[Jester]

Generally overhead wires as it is about half the weight for the same resistance and can span further.

[profesor]

QUOTE = Tinkerer; 284217] Interested in "going down the rabbit hole" with the paramagnetic effect? may be. [/ QUOTE] I guess? You like ocuk books. The size and cost mentioned above are not different.




I think it was not the main reason.
But take it? The connection of minium with copper is a point of failure.
One? Arrow defective crossfire coil g? Rd? M. However, the connection of aluminum to copper is a point of failure.

[Tinkerer]

Aluminum supports the outer area due to its paramagnetic effect.
That's why garret crossfire coils and whites bluemax deepscan 950 coils are very performance.

Could be interesting to "go down the rabbit hole" on that paramagnetic effect.

[Tinkerer]

Garrett also used aluminium wire for the TX loop in their Crossfire coils, probably because it weighs less than copper. However, the aluminium to copper connection is a point of failure. I repaired one of their 12" diameter Crossfire coils using aluminium solder.

Looking on Alibaba, one finds copper coated aluminum magnet wire.
Supose the copper coating helps for the soldering.
The higher conductivity outside might also have an influence on skin effect.

[AK48]

an engineer told me that in the event of a lightning thunderbolt on the wire the damage would be less with aluminum than with copper it is also for this reason that the television antennas are made of aluminum

[profesor]

Aluminum supports the outer area due to its paramagnetic effect.
That's why garret crossfire coils and whites bluemax deepscan 950 coils are very performance.

[dbanner]

White's used aluminum wire in the 950 for a number of years to make it lighter, but then had coils failing exactly as Nandor described. They switched back to copper. There is "aluminum grease" used for aluminum feeder cables in home wiring that helps prevent oxidation problems, but I don't think aluminum wire is worth the trouble.

Making the coil lighter yes, and also more inexpensive when scaled up to produce thousands of search coils.
I take it that aluminum magnet wire requires more turns or larger cross section for a given inductance because it has less conductivity. I wonder what would be the q factor comparison for a given inductance at a particular frequency between a coil wound from aluminum and another wound from copper wire. There respective dynamic electrical characteristics are bound to diverge.
Seems the greatest hurdle was connecting the ends to the circuit.

[Qiaozhi]

Garrett also used aluminium wire for the TX loop in their Crossfire coils, probably because it weighs less than copper. However, the aluminium to copper connection is a point of failure. I repaired one of their 12" diameter Crossfire coils using aluminium solder.

[lamoiz]

I noticed that the transport of electricity on very high voltage lines was done with aluminum cables, for what reason knowing that aluminum is less good conductor than copper?

because it is cheaper than copper, lighter, and because at more than 60kv, the electrons run on the skin of the cable, and whether it is in aluminum or copper it does not change anything.

[kt315]

I did read that copper was returned into the electric nets because aluminum has a bad property - some fluidity in the joints.
why contact is lost over time and leads to fires.

[Carl-NC]

Much cheaper.

[AK48]

I noticed that the transport of electricity on very high voltage lines was done with aluminum cables, for what reason knowing that aluminum is less good conductor than copper?

[Carl-NC]

White's used aluminum wire in the 950 for a number of years to make it lighter, but then had coils failing exactly as Nandor described. They switched back to copper. There is "aluminum grease" used for aluminum feeder cables in home wiring that helps prevent oxidation problems, but I don't think aluminum wire is worth the trouble.

[Nandor]

I have bought it from ebay, from England for 20 pounds. It was faulty, I thought that the cable is broken but I had to take it apart than I saw that the Tx coil joint was oxidized. I couldnt belive my eyes, it's 0.71mm alu coil joint together with a metalic clip to the Tx bucking coil. So I changed it with a 0.45mm copper coil than changed some caps and now it works. Its still not finished, I have to put some more glue but it works really good.

There is no way to solder alu to copper with amateur tools.

Happy new year, regards

[AK48]

" I had to change it to copper " tell me why