[R-390] R390 whistle filter data

[John Kolb]

I once made a very effective one from a 88 mH toroid (telco loading coil)
and the appropriate sized capacitor. 88 mH coils aren't as common as
they once were but still many floating around.

John

At 09:30 PM 7/16/2006, Perry Sandeen wrote:

>Hi Gang,
>
>In Chuck Felton's r390 article in Electric Radio he showed the 
>addition of a 5Kc whistle filter
>uing a 1 Henry choke and IIRC 690pf cap in series.
>
>Three questions.  Was that a mis-print for the inductor value?  If 
>not does anyone know what he
>used for the inductor?  Has anyone tried the mod?
>
>Regards, Perrier
>
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Checked by AVG Anti-Virus.
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