KPA100 standoffs

[N5BZ, Bob 'BZ' Zinn]

> Message: 27 Date: Sun, 31 Dec 2006 23:54:36 -0500 From: "Dave &
> Jeanne Robertson" <[hidden email]>
> Subject: [Elecraft] KPA100 Standoffs between heat sink and board
...

> Ben,
>
> I just finished building my KPA100 and it is quite happy in the K2 at
> this time. I agree with your observation of the milled out hole on
> the heat sink. I tried placing a lock washer between the heat sink
> and standoff (against Elecraft instructions) which resulted in not
> having the screws on the KPA100 rear panel match the hole resulting
> in having to remove the heat sink from the KPA100 PCB and removing
> the lock washer.  Afterwards the screw hole aligned perfectly. I do
> believe the board is warped a little because of the machine out
> portion of the heat sink but it seems necessary to match all the
> mounting screw holes. Anyone else have any ideas.

I, too, found the island portion seemed a bit 'high', causing the KPA
board to flex slightly upward during installation. I guess that insures
'good contact' between the transistors and the heat sink. :)

I also found the RF shield being badly distorted when I followed the
directions in the manual.

Where it say:
"Place a #4 split lock washer over each of the seven set screws."

I found it reduced(but did not eliminate) the distortion of
the RF shield when I omitted the lock washers from the two set screws
that go under the standoffs on the transistor island.

By the way, I find it MUCH easier to work with the KPA100 (test,
install, remove, reinstall) IF I remove the right side panel from the K2
first and install that panel last.

It is a trick that should be part of the directions in the manual!!!!

Finally,[and unrelated to the KPA100] the Rework Eliminator is a great
product. It came in handy when I needed to remove the KDSP2 to access
TP3. I wonder why Elecraft doesn't just throw a RE pack in with every
new K2 they ship and instruct the builder to practice their soldering by
putting together the RE first. [and no, Gary didn't pay me to say this.
I really think that the RE should go into every K2, until the options
are added, and then be saved, in the original K2 box, along with the
test probes and the QRP top cover, and the alignment tool, for times of
need.]

By the way, is K2 taller than Mt. Everest?

Well, anyway, K2 gives 'peak' experience.

....



--
-bz-    "it is a beautiful day to be alive, isn't it?" [every day]

[hidden email]
http://chemistry.lsu.edu/bz
225-578-5381
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