Dual Field Pi Coils

[Rov]

Hi ,D field coils for Minelabs PI,and Pulsemate detectors Australia.been done and dusted for some time now.Suit Whites TDI trialed and tested also,Good!
basic spec. 300uh total coil inductance both loop,an 1.2ohm total twin loop resistance.Mag.Mylar and Graphite screening to loops and shells internal.Cant say more,commercialisation in place for production and manufacture.Pulsematecoils.
Have a good day!Rov

[6666]

Whats the dia of your 300uH DF coil ?

[Reg]

Here is a link that will allow you to view the DF coil patent.

http://www.patentfish.com/search.php

Just enter dual field metal detector coil and look for the proper patent.

Reg

[6666]

Is this it ?

Patent Number: 7994789

[golfnut]

sorted list of whites patents here

http://www.google.com/search?tbo=p&t...onics,+Inc.%22

[Rov]

Hi,the Pulsematecoils variant,is 12 1/4inch outer winding size,they called "Double Field" not dual field to end name confusion with whites terminology.the windings have a pcb internally,whites do not.The detector ,whatever PI unit used sees 300uh at the coil plug total in a mono wired 5 pin plug and 1.1ohm total coils resistance.All in the ballpark for most Pi detector use easily.
Yes Fishers also have prior art patent ideas on so called dual field coils not just whites.always a work in progress for all to improve on and develop further I think.
I just quietly work away at whatever I think can give my machines that extra bit of Zing! in coil sensitivity,depth,and quietness where I can.an these have worked well for me.thanks.

[6666]

The file in post #56 is no longer there.