[R-390] re: Safety and PFY-EEs

[w9ya]

It *IS* much easier to use 63/37 based solder. It has a MUCH smaller range
of plastic temperature, i.e. the range between molten and solid, so it is
MUCH HARDER to get the so-called "cold" joint when using it, all other
factors being the same.

Bob
w9ya

On Sun, Jan 4, 2009 at 1:27 PM, wli <wli98122 at yahoo.com> wrote:

> Hi
>
> Recently, I have been tutoring a newbie. He has been an office type for
> over 30 years shuffling papers, and was intrigued to learn more about my
> hobby as a future *retirement* activity. His interest was triggered by an
> evening cruising through the international SWL bands on the R390A.
>
> In regards to the *new* solder, I suggest stockpiling a few rolls of the
> old Ersin Multicore 60/40 tin-lead 5-core rolls seen at hamfests. Three
> pounds will last us decades.
>
> After many hours, he can solder moderately well, but still has a hard-time
> understanding simple  concepts such as layout and mechanical alignment.
> After a while, I realized that he does not think in three-dimensions...
> something that Tisha's newly minted PFY-EE's clearly lack as well.
>
> I was astounded to see how today's adults have NO concept re electrical
>  and mechanical safety. Since *shop* is no longer taught in schools (under
> the mistaken belief that their  students were all gifted and destined for
> careers in politics and finance), today's adults are woefully ignorant of
> the basics.
>
> So my plea to all of us is to teach our kids and grandkids the rudimentary
> basics of doing stuff with our hands..   something sadly lacking in today's
> educational system.
>
> Thanks
>
> W. Li
>
>
>
>
>
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