So i got a little cuious abt my f3 and ability to adapt to other coils and took her apart. the coil plug in is a smaller 6 pin unit. 5 wires attach at coil adapter;blk,red,yel,blu, and green. Circuit bd tentitavly look like blk n red are tied as well as yel, blu, and grn.
coil has 29 turns with a little steel/non copper wire soliered to the leading/starting end of loop. the ANTENNA as i call it, is aprox. 10" length, starts at soldier conn near coil cntr goes 6 oclock to wrap around insulated portion of coiled wire where it enters coil pltfrm. then it goes to abt 10 oclock position bout half distance between cntr and edge of coil, passes from top side of spool to bottom side of spool where it then turns right angle to upper run and terminates bout half distance from coil cntr at aprox 2 oclock bearing from cntr.
the spool is styrofoam 3/4 thick w/ spool groove being 5/16 " wide or tall, and in-set abt 1/2 " it is held in place by rubber band and entire surface of spool is wrapped with heavy paper that appears to have graphite? looking coating on it.
AND HERE I THOUGHT THIS STUFF WAS ROCKET ZCIENCE. LOL.
Just my preliminary findings, for those curious.
now i just need: info on winding coils, findd small 6 pin plug-ins, and a 3d printeer to make coil foot adapter to hold other coils.
thats it for now, gotta do some home-work on it. I ll post more later. Happy hunting.