Bigger coils less winds?

[6666]

A little bit of work has been done on Atx coils in this thread
I am about to start some experiments with the WM6 coil, AKA Davor/ATX coil.
I even used the same colour wire as the WM6 drawing.
http://www.geotech1.com/forums/showt...&highlight=atx

[punagold]

I had read that other thread. Your coil looks great. What type and size of wire did you use? Is there a reason that you do not push the 2 halves together more so that the edges are lined up next to each other? I am looking forward to your results.

[6666]

The type of wire is just .47mm with pvc insulation its wire wrap wire, the coils are just sitting on the floor so I could take the photo, they are not connected to anything.


I got excited about the coil after seeing this video and small chain at 1:9 into the video, and was wondering if its the geometry of the coil that provides such a response to the chain.
https://www.youtube.com/watch?v=EVRUtDeWED8

[IBGold]

To ballance the coils properly you need a scope I use a signal generater and a scope mine is a dual trace storage scope I bought off EBay for $100.00 when I get time I will dig out the circuit of my coil test box and PM it to you.

Yes you will have to solder the ends of the Litz properly imersion soldering is best if you have an old large soldering iron drill a 3mm hole about 10mm deep turn the iron on let it heat up put solder in the hole and pre flux the Litz for 10 mm then feed the litz into the hole where the solder is for about half a minute or so and when you pull it out it should be properly tinned.

Regards, Ian.

I thought it might be an IB coil, but then I read somewhere that only VLF were IB. Thanks for clearing that up.

I hope that I do not need a scope to get the 2 coils in balance. I was thinking I could just turn the detector on and move the coils around and test with targets until I get the best response, or I may have to buy one of those cheap $70 scopes that use a laptop to balance the coils. I saw a youtube video where a guy moved the 2 coils back and forth until the RX was a straight line on the scope.

Thanks for the tip in measuring the inductance. I think with the litz I may have to solder tinned wire to the tips in order to get good meter readings. Monday a holiday so waiting for Tuesday to order the 40/44 Litz.

[punagold]

I hadn't see that video before. Not sure if it's the coil or the ATX itself. I use mine with an infinium coil. Works great, but have not spend a lot of time comparing the two coils.

Looks like I need to pick up a scope. Is there a certain range that I need to be aware of while shopping? And thanks for the tip of proper tinning the tips. I appreciate all of the help guys.

[IBGold]

20MHz should be OK that is what mine is.

Regards, Ian.

[Davor]

2-channel 20MHz is OK.