Basket coil question

[eagle52]

Could anyone tell me how to calculate wire length for basket type coil is it same way as flat spiral coil ?

Thank you

Jan

[baum7154]

It depends on which basket coil wind pattern and shape you will build. It is impossible to give a single answer. I just wound an oval spider coil (see CHANCE PI COIL thread) and 28 turns give 334 uh. Removing one turn gives 312 uh. Wire is 24 awg PTFE (teflon) 600 volt insulation.

Good luck!

Dan

[6666]

Thats a hard question but it might be approximated, make the former and wind one turn then measure the length then x by turns and add some for the bunch effect of the wire building up over 30 turns, I could do it but need to unsolder the feedline, this is only very approx idea.

Ok I cut off the feedline and wound one turn around the bunched windings on the 8 inch ROUND former and is aprox 31 inches or 79cm
my coil uses cat 5 cable wire with polypropylene insulation and needed 33 turns for 325uH, so 33x31 = 1023 inches or 33x79 = 2607 cm, plus you need to add some for fudge factor and feedline.

[eagle52]

Thank you very much
Jan