[Boatanchors] Fw: Re: Making coils ...some data

[Gary Schafer]

Very interesting Kees.
Did you twist the two wires or just wind them on the coil as they came
off the spool?

Seems like little advantage to the basket weave.

73
Gary  K4FMX


Sandy and Kees Talen wrote:

> Thanks for all the input on why coils are wound the way they are.
> Here is some data which may be of use:
>
> Three identical spools were hand wound (not "exact" but close
> enough to understand the effect). Roughly one spool length wire
> traverse per revolution of the spool for the "basket weave" coils.
> All coils trimmed to 2.0mH. The absolute accuracy of the Q
> meter is not as important as the relative accuracy. Q Data is
> "unloaded Q".
>
>
> Coil #1 #34 AWG, level wound, 200Khz, 325pf, Q of 52
> Coil #2 #34 AWG, basket weave wound, 200Khz, 320pf, Q of 55
> Coil #3 two #38 AWG, basket weave, 200Khz, 310pf, Q of 78
> Coil #1 #34 AWG, level wound, 170Khz, 440pf, Q of 55
> Coil #2 #34 AWG, basket weave wound, 170Khz, 447pf, Q of 57
> Coil #3 two #38 AWG, basket weave, 170Khz, 433pf, Q of 78
>
> Two strands of #38 AWG has "roughly" the same DC current
> capability as one strand of #34. Three strands of #38 will probably
> have an even higher Q and better DC capability.
>
> 73s  Kees K5BCQ
>
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