I've found that the "RoHS-compliant" lead-free solders, which are a
tin/copper/silver alloy tend to hold up better outdoors than the usual
tin/lead alloys. The lead-free stuff is also pretty easy to get from
just about anywhere due to the need for many electronic devices to be
lead free these days.
> It has been my experience at this QTH in NJ that soldered connections
> outdoors do not do well with solder that contains lead. Over time the
> connections all turn dull and often the solder on a well-soldered
> will crumble over time.
> For this reason all my outdoor soldered connections are made with a
> that is 96 percent tin and 4 percent silver. It is readily available
> the US at Radio Shack stores.
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