lightweight coil

[golfnut]

I like light coil design as shaft can be longer for bigger arc on a big-field sweeper.

if u have ~270 t on a 12" coil the coil mass is appreciable.


I thought about ally wire and although the R is a bit higher it is only 1/3 the mass !!

Ive seen it for sale, anybody used?

[Silver Dollar]

I've heard of it being used on RX only. The problem is fixing it to the cable,
some sort of crimp is needed...

[Davor]

You can as well use some thinner wire instead.
Tx is problematic with larger resistance because it lowers the coil Q so it may not start oscillation, and at best it will just consume more juice.
PI... will most probably be just as happy with a coil that has more resistance, but the pulses will be less energetic. I'll make a basket weave with such a wire I got from WM6. I intend to twist it if soldering proves problematic. I used to weld aluminium wires in oil, it is tedious, and you MUST protect the joint or otherwise copper and aluminium destroy each other. The whole idea of soldering aluminium to copper is plainly bad and I can recommend it only as a curiosity exercise.

[Qiaozhi]

Garrett 12" diameter Crossfire coils use aluminium wire for the TX loop. A common problem with these coils is that there's a solder joint between the TX and the nulling coil (which uses copper wire), and it can develop a dry joint. I've successfully repaired a Crossfire coil using aluminium solder.

[Davor]

Eeeek!

[golfnut]

Still on the light weight. But not coil ...


Has anyone done a data link to coil using a cheap polymer optical fiber?

This would work under water unlike a deus.

Would not corrode in salt like copper can.


Would have no losses of Tx drive or Rx signal loss in the coax as electronics in coil

Light too ( no pun )

[WM6]

ECCA (Enamelled Copper Clad Aluminium) wire need to be soldered carefully to avoid irreversible oxidization of thin copper layer.

Solder ECCA wire quick, with proper heated soldering iron, and without removing enamel layer before.