[time-nuts] wwvb weak on east coast especially when the pre-amps under wa...

paul swed paulswedb at gmail.com
Tue May 15 02:43:59 UTC 2012


I speculate that water runs off.
But that said the preamp did run 4 years and I didn't really do anything
special.
In fact the preamps cleaned up and ready to be remounted tomorrow. But
first I have to see what may have let the moisture in. At least was it
something large that needs to be plugged etc.
Thanks everyone
Regards
Paul.

On Mon, May 14, 2012 at 10:39 PM, Hal Murray <hmurray at megapathdsl.net>wrote:

>
> K3WRY at aol.com said:
> > If you can keep the boards in a vertical mount position, and they have
> been
> > sprayed with a conformal coating, the heat from the components and the
> > coating will keep any moisture from forming on the boards in a vertical
> > position.  We do this in several products we supply to the military.
>
> Does this help significantly for an antenna preamp that doesn't dissipate
> much power?
>
> How much power does a board have to dissipate to keep dry?  I assume it
> depends upon the size of the board, but I doubt if it's linear.
>
> What's magic about vertical for keeping dry?  I'd expect a vertical board
> to
> have better air flow and hence better cooling, but does that keep it dryer?
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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