However the dimensions of the coil former vary with moisture content.
Impregnation with waxes and other organic materials merely serves to slow down 
the rate of absorption and doesn't prevent it.
Bruce 
> On 28 November 2017 at 12:36 Poul-Henning Kamp <p...@phk.freebsd.dk> wrote:
> 
> 
> --------
> In message <2b66d682-15cf-465f-9a34-d7f7e7929...@n1k.org>, Bob kb8tq writes:
> 
> >Straight cardboard *is* an issue on RF coils in humidity.
> 
> The C-field coil is DC only.
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> p...@freebsd.org         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.
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