OK, brace your self, but I told you so (a few weeks ago) - not
specifically you, Emory.
Surface mount work takes skill and calmness. I compare it to the
process precision shooters use. Breathing in/out and out half-way
and hold will calm nerves. Mental thinking to calm yourself vs
saying "do not shake" is some of the zen stuff that works. Resting
the heel of your hand on something helps holding still. Whisky or
some of that tobaccy that will mellow you...but you might get
munchies so caveat emptor! (legal in only three states)
Bees wax or putty with a toothpick are beginners
methods. Professionals get a fine jeweler's tweezer to hold sm. Use
what works for you.
Soldering a sm cap on top of an existing cap is a little tricky. Add
a bit solder to one end of the existing cap so the new cap can be
slid into it. You melt that solder with iron and slide in the top
cap - hold - carefully remove iron -keep holding a couple seconds
till solder solidifies. Now add a bit of solder on the other
end. Use an ohmmeter to test continuity from the top cap to the pc
trace where the cap is installed. Good continuity - you're
done! Continuity across the cap - bad - do over.
If this is just too hard for you, then find a local ham to help you
with it. Or send it to Elecraft. The filter is not large so not real
expensive to ship. This is not a service that would be cost-effective
for me to do for you.
73, Ed - KL7UW (wish I could still pass the soldering inspection that
I used to get from NASA - brag blah blah)
-------------------------
Date: Tue, 7 Jul 2015 14:49:03 -0700
From: Wayne Burdick <n...@elecraft.com>
Subject: Re: [Elecraft] K3 KBPF3 mod for LF questions capacitor size ?
Message-ID: <5a527057-cdd2-4997-b957-62def2f21...@elecraft.com>
Content-Type: text/plain; charset=windows-1252
They're 0603s (.06" x .03"), which would be considered "mediums size"
by today's SMD standards. But it does take a bit of courage (and a
good pair of tweezers, and maybe a shot of cheap whisky) to install
them by hand. Hats off to our intrepid customers attempting this for
the first time!
73,
Wayne
N6KR
P.S. Our engineers and technicians routinely work with with packages
that are about 0603 size, but have *6* leads that must all be
soldered. This is done by flowing solder onto all 3 pins on one side
at a time (carefully!), then wicking the excess solder off with
solder wick or a vacuum tool. Not for the faint of heart.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubus...@gmail.com
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