[Hi-zreceivingarraydiscussions] Preamp Installation in high humidity environments

[Roger D Johnson]

Sorry! Meant this to got to Bill

On 3/8/2012 4:46 PM, Roger D Johnson wrote:
> 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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>>
>>
>

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