An implementation of Analog cellular networks like A-Netz, B-Netz, C-Netz, NMT, AMPS, TACS, JTACS, Radiocom 2000, IMTS, MPT1327, Eurosignal and more http://osmocom-analog.eversberg.eu/
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osmocom-analog/cad/coil.scad

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352 B

$fn = 100;
durchmesser=30;
rille=8;
wand=1;
module torus(d1, d2) {
rotate_extrude(convexity = 10)
translate([d2/2+d1/2, 0, 0])
circle(r = d1/2);
}
intersection() {
difference() {
torus(rille+wand*2,durchmesser-wand*2);
torus(rille,durchmesser);
}
translate([0,0,-5]) cylinder(h=10, r=(durchmesser+rille)/2);
}