coil method for bifilar coil

[simeon webber]

coils.....

i found in my local emporium a collection of "hook up" wire
plasic coated

.5 mm center solid conductor

and gives about 1R per 6 meter lenth

this is nice for a bifilar coil

as the shop had several colours

i will set too work today to build a mak 2 multicoil set
from this and some cloth tape {normaly for heating insulation or for platerboard walls}

i used the approch with the last bifilar coil {very precice for bfo detector arrangement will double there sensativity and output and you can also make the coil directional depending on the twist direction and the winding order

i use a pre resistance measured wire 23R for triangle coil

or pi X pi a s a size in inches 9 " being the first overtone of pi 3.14 etc

so using a drill set to the direction i want to wind first

run off the run of bifilar from your two wires ....using the drill


then coil this
you can also add center tap etc


i tried this using the terrazo tap coil fet oscilator design and was able to increase its field by around 30% by replacing the tap coil with a bifilar tap

[simeon webber]

http://www.emclab.umr.edu/new-induct/

here is a coil calculator i use for large coils of different shapes



emclab (http://www.emclab.umr.edu/new-induct/)