surf pi 1.2 silverdog coil building

[junkhunter]

what is the best coil you guys have built an whats the smallest thing you can pick up?
post pictures of coils and your homemade detector

small gold ear ring at 3 inches

[baum7154]

3DSS (3Dimensional winding pattern - Self Shielding) Coil AKA Chance PI coil

The 3DSS coil as detailed in the Chance PI Coil thread is the best mono coil I have built and has better sensitivity to small gold than the traditional shielded coils I have built. Many pictures and construction details for both round and oval coils are posted in the Chance PI Coil thread. A few photos are attached below.

Regards,

Dan

[6666]

JH what is that coil you are useing ?
http://www.geotech1.com/forums/attac...6&d=1442987292

[junkhunter]

hi 6666 guru
i am using an old 10" concentric spider coil i gutted out 11 loose winds on outer and 19 inner and picks up a pin at 2 inches

[junkhunter]

hi baum7154 nice job on the coil looks very complex

[6666]

hi 6666 guru
i am using an old 10" concentric spider coil i gutted out 11 loose winds on outer and 19 inner and picks up a pin at 2 inches
[ATTACH]33842[/ATTACH]

Thanks for the info

[Qiaozhi]

hi 6666 guru
i am using an old 10" concentric spider coil i gutted out 11 loose winds on outer and 19 inner and picks up a pin at 2 inches
[ATTACH]33842[/ATTACH]

I estimate that your TX coil has about 100uH inductance. Is that correct?

[junkhunter]

i don't know i just do it from trial and error no one helps me.tell me how to test Uh

[Qiaozhi]

i don't know i just do it from trial and error no one helps me.tell me how to test Uh

You need to use an inductance meter to measure the actual inductance. However, you can calculate the value (as I did, to get 100uH) using the Coil Calculator -> Coil Calculator
Your coil is 10" diameter, which is 127mm radius. I can see from the photos the wire is enamelled copper, so I assumed a wire thickness of 0.56mm.

[junkhunter]

if you post pictures i can understand more

[kt315]

[junkhunter]

this is my machine kt315 what setting do i put it on. I will make a youtube video to show it works in next week

[Qiaozhi]

this is my machine kt315 what setting do i put it on. I will make a youtube video to show it works in next week
[ATTACH]33852[/ATTACH]

Your multimeter doesn't have an inductance measurement capability.

[junkhunter]

also lithium grease in the knob and a o ring in pot shaft seals under water . works well

[junkhunter]

thinking juice works well too solve problems