[Hi-zreceivingarraydiscussions] Preamp Installation in high humidity environments

[Roger D Johnson]

How about a good slathering of silicone grease on the preamp side of
the connector? I didn't have that problem because I took the boards out
of the cases and mounted them in some wx proof boxes I had laying
around. Also, a very small weep hole drilled at the lowest part of the box
might help. Congrats on 3C0! I'm still trying.

73, Roger


On 3/8/2012 2:57 PM, Bill Tippett wrote:
> I recently repaired one of my ~30 month old RX 4SQ preamps.  When I folded
> the board back I noticed some aquamarine colored corrosion around the
> inside insulator area of the connector.  However the cable side of the
> connector looked clean.  After thinking about this I believe the following
> is happening:
>
> 1.  In NC summers we often have high humidity (90-95% RH) and high
> temperatures (>90).
> 2.  At night temperatures cool which probably causes condensation inside
> the preamp case.
> 3.  My preamps are mounted connector side down so condensation collects
> around the connector causing corrosion.
>
> My preamp and cable entry is covered by an inverted plastic bucket to
> prevent critters from chewing.  The problem with this is that the cover
> also prevents the sun from warming the black preamp case which would
> otherwise help dissipate the moisture.
>
> I'm going to try mounting my preamps so that a metal side corner faces
> down.  Hopefully this will allow condensation to weep out around the metal
> cover instead of collecting around the connector.  For those of you in
> similar environments, you might want to consider this.  I don't know if it
> will work but it surely cannot hurt!
>
> 73&  GL!
>
> Bill  W4ZV
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