DIY Mad Litz Wire for ULTRA FAST PI Coils

[6666]

Hi Green, thanks for taking the time and trouble to do this experiment, very good results and good information for coil building.
All being fair, then small solder joints a small bead should work.

[waltr]

Hi Green, thanks for taking the time and trouble to do this experiment, very good results and good information for coil building.
All being fair, then small solder joints a small bead should work.

Yes, interesting experiment.
Thanks for testing.

[phred01]

Lead is much like gold as far as the detector is concerned. The bead does mask the lead signal but introduces its own see the 2nd pix. The best way is to spot weld the wires together or use a Cu ferrule and crimp the joint

[IBGold]

can you tell something about the Performance of this coil?

Hi all I am back starting to be able to use the arm again and have now finished this coil final details are.
Mono spider coil.
20 turns of 150/38 litz wire.
Turns spacing 5 mm former 10 mm thick rebated 2 mm deep 1.6 mm wide to take the winding both sides.
Coil to shield capacitance. = 106.2 pf.
SRF shield in place but not connected. = 695 KHz.
Coax 1400 mm long. = 100 pf.
Finished Inductance. = 295 uh.
Finished resistance. = 0.48 ohms.
Finished SRF. = 552 KHz.

Regards, Ian.

[phred01]

On What detector u going to use this coil on Would be very interested in ur test results

[eclipse]

Hi all I am back starting to be able to use the arm again and have now finished this coil final details are.
Mono spider coil.
Regards, Ian.

That's a piece of art! It's probably the best built coil I've seen by far.

[IBGold]

That's a piece of art! It's probably the best built coil I've seen by far.

I do not know about that but I try and for phred01 the coil will be used on a QED and a GPX5000.

Regards, Ian.

[nonkapo]

Yes i agree it is a piece of art. But before i try building it myself i never realize how much work and patience it requires. My end result was something much uglyer but it works prity well with my surf. So far the best coil from all the types i try. Respect for your hard work and expecting to hear about the end results(my one will be posted later as the cable i have was shorter and i achieve only 140uH on 0.5Ohm).

[Elliot]

I built my speaker wires using this method, and then wove them into a square cross section. It is absolutely a two person job! You end up using about 50% more length of cable though.

[Elliot]

Hi all I am back starting to be able to use the arm again and have now finished this coil final details are.
Mono spider coil.
20 turns of 150/38 litz wire.
Turns spacing 5 mm former 10 mm thick rebated 2 mm deep 1.6 mm wide to take the winding both sides.
Coil to shield capacitance. = 106.2 pf.
SRF shield in place but not connected. = 695 KHz.
Coax 1400 mm long. = 100 pf.
Finished Inductance. = 295 uh.
Finished resistance. = 0.48 ohms.
Finished SRF. = 552 KHz.

Regards, Ian.

Hi Ian. Just to clarify, the former was 5mm thick (not sure what material it was made from), the wire crossover junction was a 10mm wide, 2mm deep notch. What was the 1.6mm wide dimension for? Nice work and great measurements!

[IBGold]

Hi Elliot,

The former is made from two layers of 5 mm XPS foam bonded together the cutouts where the wires cross sides id 5 mm wide the groves that are routed out to take the wires are 2 mm deep and 1.6 mm wide with a 1.6 mm router bit I then put two layers of XPS over each side as shield spacer I have not got a picture of that coil finished ready to shield but finished flat wound coil ready to shield as attached should give you the idea.

Regards, Ian.

[Elliot]

[ATTACH]45396[/ATTACH]Hi Elliot,

The former is made from two layers of 5 mm XPS foam bonded together the cutouts where the wires cross sides id 5 mm wide the groves that are routed out to take the wires are 2 mm deep and 1.6 mm wide with a 1.6 mm router bit I then put two layers of XPS over each side as shield spacer I have not got a picture of that coil finished ready to shield but finished flat wound coil ready to shield as attached should give you the idea.

Regards, Ian.

Now I get it! What do you shield with over the XPS - spray-on or copper foil? I look forward to seeing the progress.

[IBGold]

Hi Elliot,

I paint either the housing or the outside of the foam with Commercial graphite shielding paint and I will take a picture of the finished coil with hand fabricated housing.

Regards, Ian.

[pustareka]

Hi all I am back starting to be able to use the arm again and have now finished this coil final details are.
Mono spider coil.
20 turns of 150/38 litz wire.
Turns spacing 5 mm former 10 mm thick rebated 2 mm deep 1.6 mm wide to take the winding both sides.
Coil to shield capacitance. = 106.2 pf.
SRF shield in place but not connected. = 695 KHz.
Coax 1400 mm long. = 100 pf.
Finished Inductance. = 295 uh.
Finished resistance. = 0.48 ohms.
Finished SRF. = 552 KHz.

Regards, Ian.

Privetik

Super Sped Coil SD/GP,GPX. №#1.

Thenk you

[IBGold]

Hi Elliot,

As promised here is the picture of the finished coil with hand made housing.

Regards, Ian.