Hi Gary,
The coil as you've described should be about 80 uH.
A 3" winding, other dimensions remaining constant, will provide 60 uH.
Calculations performed on an American Hydromath Calculaide Frequency Computer
(circular slide format), 1955 vintage.
FYI: At 45 TPI, the wire is likely #24 enameled.
73 & Good afternoon,
Marv WC6W
http://wc6w.50webs.com/
--- On Sat, 2/21/09, Gary Smith <Gary@doctorgary.net> wrote:
> From: Gary Smith <Gary@doctorgary.net>
> Subject: [Amps] turns = henries question
> To: Amps@contesting.com
> Date: Saturday, February 21, 2009, 11:21 AM
> 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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|