Gary,
To get 60uh on a .676" dia form you'll need a close-wound
coil, 45 tpi, about 3" long. That per my ARRL LCF/Coil-winding
Calculator.
73,
Charlie, N0TT
On Sat, 21 Feb 2009 14:21:35 -0500 "Gary Smith" <Gary@doctorgary.net>
writes:
> Hi,
>
> For you math whizzes out there (math is not my strong point)...
>
> I need 60uH for a plate choke.
>
> The existing coil apparently uses 23 guage wire and the coil form is
>
> .676" OD. There are 45 turns per inch and the length of the windings
>
> on the coil form is 4.052" long.
>
> Accdording to wikipedia
>
> http://en.wikipedia.org/wiki/American_wire_gauge
>
> My wire measures .022" so acording to the chart, I call that 23
> gauge. Radio shack has enameled wire but the closest guage is 22
> Gauge and that measures .025" which also jives with the chart.
>
> I don't know how many turns of the 23 guage on this coil form will
> give me 60uH. Can anyone help me out on this?
>
> Thanks,
>
> Gary
> KA1J
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>
>
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